1
|
Williamson DR, Davies EJ, Ludvigsen M, Hansen BH. Flow-through imaging and automated analysis of oil-exposed early stage Atlantic cod ( Gadus morhua). Toxicol Mech Methods 2024:1-13. [PMID: 38572598 DOI: 10.1080/15376516.2024.2338389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 03/26/2024] [Indexed: 04/05/2024]
Abstract
Toxicology studies in early fish life stages serve an important function in measuring the impact of potentially harmful substances, such as crude oil, on marine life. Morphometric analysis of larvae can reveal the effects of such substances in retarding growth and development. These studies are labor intensive and time consuming, typically resulting in only a small number of samples being considered. An automated system for imaging and measurement of experimental animals, using flow-through imaging and an artificial neural network to allow faster sampling of more individuals, has been described previously and used in toxicity experiments. This study compares the performance of the automated imaging and analysis system with traditional microscopy techniques in measuring biologically relevant endpoints using two oil treatments as positive controls. We demonstrate that while the automated system typically underestimates morphometric measurements relative to analysis of manual microscopy images, it shows similar statistical results to the manual method when comparing treatments across most endpoints. It allows for many more individual specimens to be sampled in a shorter time period, reducing labor requirements and improving statistical power in such studies, and is noninvasive allowing for repeated sampling of the same population.
Collapse
Affiliation(s)
- David R Williamson
- Department of Climate and Environment, SINTEF Ocean, Trondheim, Norway
- Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Emlyn J Davies
- Department of Climate and Environment, SINTEF Ocean, Trondheim, Norway
| | - Martin Ludvigsen
- Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | | |
Collapse
|
2
|
Parkerton T, Boufadel M, Nordtug T, Mitchelmore C, Colvin K, Wetzel D, Barron MG, Bragin GE, de Jourdan B, Loughery J. Recommendations for advancing media preparation methods used to assess aquatic hazards of oils and spill response agents. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 259:106518. [PMID: 37030101 PMCID: PMC10519191 DOI: 10.1016/j.aquatox.2023.106518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 03/15/2023] [Accepted: 04/02/2023] [Indexed: 05/15/2023]
Abstract
Laboratory preparation of aqueous test media is a critical step in developing toxicity information needed for oil spill response decision-making. Multiple methods have been used to prepare physically and chemically dispersed oils which influence test outcome, interpretation, and utility for hazard assessment and modeling. This paper aims to review media preparation strategies, highlight advantages and limitations, provide recommendations for improvement, and promote the standardization of methods to better inform assessment and modeling. A benefit of media preparation methods for oil that rely on low to moderate mixing energy coupled with a variable dilution design is that the dissolved oil composition of the water accommodation fraction (WAF) stock is consistent across diluted treatments. Further, analyses that support exposure confirmation maybe reduced and reflect dissolved oil exposures that are bioavailable and amenable to toxicity modeling. Variable loading tests provide a range of dissolved oil compositions that require analytical verification at each oil loading. Regardless of test design, a preliminary study is recommended to optimize WAF mixing and settling times to achieve equilibrium between oil and test media. Variable dilution tests involving chemical dispersants (CEWAF) or high energy mixing (HEWAF) can increase dissolved oil exposures in treatment dilutions due to droplet dissolution when compared to WAFs. In contrast, HEWAF/CEWAFs generated using variable oil loadings are expected to provide dissolved oil exposures more comparable to WAFs. Preparation methods that provide droplet oil exposures should be environmentally relevant and informed by oil droplet concentrations, compositions, sizes, and exposure durations characteristic of field spill scenarios. Oil droplet generators and passive dosing techniques offer advantages for delivering controlled constant or dynamic dissolved exposures and larger volumes of test media for toxicity testing. Adoption of proposed guidance for improving media preparation methods will provide greater comparability and utility of toxicity testing in oil spill response and assessment.
Collapse
Affiliation(s)
- Thomas Parkerton
- EnviSci Consulting, LLC, 5900 Balcones Dr, Suite 100, Austin, TX 78731, United States.
| | - Michel Boufadel
- Center for Natural Resources, Dept. of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd., Newark, NJ, United States.
| | - Trond Nordtug
- SINTEF Ocean AS, P.O. box 4762, Torgarden, Trondheim NO-7465, Norway.
| | - Carys Mitchelmore
- University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, 146 Williams Street, Solomons, MD, United States.
| | - Kat Colvin
- College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom.
| | - Dana Wetzel
- Environmental Laboratory of Forensics, Mote Marine Laboratory, 1600 Ken Thompson Parkway, Sarasota, FL, United States.
| | - Mace G Barron
- Office of Research and Development, U.S. Environmental Protection Agency, Gulf Breeze, FL 32561, United States.
| | - Gail E Bragin
- ExxonMobil Biomedical Sciences, Inc., 1545 US Highway 22 East, Annandale, NJ 08801, United States.
| | - Benjamin de Jourdan
- Huntsman Marine Science Centre, 1 Lower Campus Rd, St. Andrews, St. Andrews, New Brunswick E5B 2L7, Canada.
| | - Jennifer Loughery
- Huntsman Marine Science Centre, 1 Lower Campus Rd, St. Andrews, St. Andrews, New Brunswick E5B 2L7, Canada.
| |
Collapse
|
3
|
Dettman HD, Wade TL, French-McCay DP, Bejarano AC, Hollebone BP, Faksness LG, Mirnaghi FS, Yang Z, Loughery J, Pretorius T, de Jourdan B. Recommendations for the advancement of oil-in-water media and source oil characterization in aquatic toxicity test studies. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 261:106582. [PMID: 37369158 DOI: 10.1016/j.aquatox.2023.106582] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 04/01/2023] [Accepted: 04/03/2023] [Indexed: 06/29/2023]
Abstract
During toxicity testing, chemical analyses of oil and exposure media samples are needed to allow comparison of results between different tests as well as to assist with identification of the drivers and mechanisms for the toxic effects observed. However, to maximize the ability to compare results between different laboratories and biota, it has long been recognized that guidelines for standard protocols were needed. In 2005, the Chemical Response to Oil Spills: Ecological Effects Research Forum (CROSERF) protocol was developed with existing common analytical methods that described a standard method for reproducible preparation of exposure media as well as recommended specific analytical methods and analyte lists for comparative toxicity testing. At the time, the primary purpose for the data collected was to inform oil spill response and contingency planning. Since then, with improvements in both analytical equipment and methods, the use of toxicity data has expanded to include their integration into fate and effect models that aim to extend the applicability of lab-based study results to make predictions for field system-level impacts. This paper focuses on providing a summary of current chemical analyses for characterization of oil and exposure media used during aquatic toxicity testing and makes recommendations for the minimum analyses needed to allow for interpretation and modeling purposes.
Collapse
Affiliation(s)
| | - Terry L Wade
- Geochemical and Environmental Research Group, Texas A&M University, College Station, Texas, USA
| | | | | | - Bruce P Hollebone
- Environment and Climate Change Canada, Emergency Sciences and Technology, Ottawa, Ontario, Canada
| | | | - Fatemeh S Mirnaghi
- Environment and Climate Change Canada, Emergency Sciences and Technology, Ottawa, Ontario, Canada
| | - Zeyu Yang
- Environment and Climate Change Canada, Emergency Sciences and Technology, Ottawa, Ontario, Canada
| | | | | | | |
Collapse
|
4
|
Hansen BH, Nordtug T, Øverjordet IB, Sørensen L, Kvæstad B, Davies EJ, Meier S, Gomes T, Brooks S, Farkas J. Monitoring ocean water quality by deployment of lumpfish (Cyclopterus lumpus) eggs: In situ bioaccumulation and toxicity in embryos. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 245:114074. [PMID: 36137423 DOI: 10.1016/j.ecoenv.2022.114074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 08/29/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
Fish embryos can bioaccumulate and are particularly sensitive to a wide range of contaminants, which makes them suitable sentinels for environmental biomonitoring. However, fish embryos are very rarely utilized in environmental monitoring surveys, possibly due to their fragility and seasonality. In the present work, we assessed the applicability of caged lumpfish (Cyclopterus lumpus) eggs for in situ biomonitoring of exposure and effects of organic contaminants focusing on polyaromatic hydrocarbons and phenolic compounds. Fertilized eggs (1 dpf) were transplanted for 17-19 days at different locations that differed in terms of contaminant load, depths and weather conditions, namely at three stations close to the city of Trondheim (two harbour areas and a one in the Fjord) and three stations at a coastal aquaculture facility. High survival upon retrieval after deployment showed that lumpfish eggs are relatively robust and survive encaging in different environments. Bioaccumulation of organic contaminants (PAHs and phenolic compounds) was measured and potential effects on hatching, development, survival and larvae morphometry were determined. Chemical analyses showed that especially PAHs were effectively accumulated in eggs in contaminated sites, with concentrations of ƩPAHs being 15 - 25 times higher in harbour areas compared to those at the aquaculture facility. A higher incidence of embryonic deformations was observed in the most polluted deployment location, but larvae morphometry revealed no evidence of toxicity related to pollutant body burden. In conclusion, the in-situ exposure method was proven to work well, making it attractive for implementations in environmental monitoring programs.
Collapse
Affiliation(s)
- Bjørn Henrik Hansen
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway.
| | - Trond Nordtug
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| | - Ida Beathe Øverjordet
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| | - Lisbet Sørensen
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| | - Bjarne Kvæstad
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| | - Emlyn John Davies
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| | - Sonnich Meier
- Institute of Marine Research (IMR), P.O. Box 1870 Nordnes, NO-5817 Bergen, Norway
| | - Tânia Gomes
- Norwegian Institute of Water Research, Økernveien 94, NO-0579 Oslo, Norway
| | - Steven Brooks
- Norwegian Institute of Water Research, Økernveien 94, NO-0579 Oslo, Norway
| | - Julia Farkas
- SINTEF Ocean, Climate and Environment, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
| |
Collapse
|
5
|
Hess C, Little L, Brown C, Kaller M, Galvez F. Transgenerational effects of parental crude oil exposure on the morphology of adult Fundulus grandis. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 249:106209. [PMID: 35724524 DOI: 10.1016/j.aquatox.2022.106209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 04/03/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
The current study involved exposing adult F0 Gulf killifish (Fundulus grandis) to Macondo-252 oil for 36 to 44 days and assessing the effects of this oiling on the swimming performance and morphology in two generations of progeny reared in clean water. Following exposure to oil, the F0 fish were used as broodstock to generate four lineages of F1 fish using a full-matrix mating design derived from the gametes of clean and oil-exposed parents. Later, the four lineages of F1 fish were used as broodstock to create an F2 generation of the same four lineages. We found few differences in embryonic outcome (% dead,% hatched, and% unhatched) in any of the four lineages of F1 and F2 fish. However, as adults, F1 and F2 fish derived from oil-exposed males from the F0 generation had significantly lower critical swimming speeds (Ucrit) than both the control and maternally oil-exposed lineages. Additionally, progeny of oil-exposed fish had altered body shape based on the statistical analysis of two-dimensional landmark-based geometric morphometrics. Fish from oil-exposed lineages showed increased body depth, altered spinal curvature, and changes in the upward angle of projection of the head. Both generations had a significant main effect of maternal and paternal oil exposure on shape; however, F0 paternal oil exposure explained more of the variance in shape across both generations relative to F0 maternal exposure. Our findings demonstrate that parental exposure to oil can impact the shape and aerobic swimming capacity of offspring for at least two generations after the original paternal oiling.
Collapse
Affiliation(s)
- Chelsea Hess
- Department of Biological Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States.
| | - Lauren Little
- Department of Biological Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States
| | - Charles Brown
- Department of Biological Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States
| | - Michael Kaller
- School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States
| | - Fernando Galvez
- Department of Biological Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States.
| |
Collapse
|
6
|
Ji W, Abou Khalil C, Boufadel M, Coelho G, Daskiran C, Robinson B, King T, Lee K, Galus M. Impact of mixing and resting times on the droplet size distribution and the petroleum hydrocarbons' concentration in diluted bitumen-based water-accommodated fractions (WAFs). CHEMOSPHERE 2022; 296:133807. [PMID: 35131278 DOI: 10.1016/j.chemosphere.2022.133807] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 01/23/2022] [Accepted: 01/28/2022] [Indexed: 06/14/2023]
Abstract
The preparation of Water-accommodated Fractions (WAFs) and chemically enhanced WAFs (CEWAFs) are essential for evaluating oil toxicity. The Chemical Response to Oil Spills: Ecological Research Forum (CROSERF) method was widely adopted, with variables (e.g., mixing time, oil loading, etc.) being continuously changed among research groups, which limits the cooperation in this area. Herein, we conducted WAF and CEWAF experiments using two loadings of diluted bitumen (Dilbit): 1 g/L and 10 g/L. For the CEWAF, the dispersant to oil ratio was 1:20. We investigated the impact of three mixing durations (18 h, 42 h, and 66 h) and two resting times (6 h and 24 h) on the droplet size distribution (DSD) and accommodated oil concentration. This would be highly beneficial for analyzing toxicity from oil spills, especially when considering the toxic effect of both suspended oil droplets and dissolved hydrocarbons. The DSD results and oil chemistry analysis showed that at a low oil loading concentration (1 g/L), both WAFs and CEWAFs had the same DSD, with an average d50 (volume median diameter) of 3.38 ± 0.70 μm and 3.85 ± 0.63 μm, respectively. At a high oil loading concentration (10 g/L), the WAFs had an average d50 of 3.69 ± 0.52 μm, showing no correlation with mixing and resting time. The DSD of CEWAFs increased significantly at 42 h mixing and 24 h resting time, with oil concentration reaching equilibrium after 42 h mixing. Therefore, WAFs appears to require only 18 h mixing and 6 h resting, while it is recommended to have 42 h mixing and 24 h resting for CEWAFs at high dilbit oil loading concentrations.
Collapse
Affiliation(s)
- Wen Ji
- Center for Natural Resources, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd, Newark, NJ, 07102, USA
| | - Charbel Abou Khalil
- Center for Natural Resources, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd, Newark, NJ, 07102, USA
| | - Michel Boufadel
- Center for Natural Resources, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd, Newark, NJ, 07102, USA.
| | - Gina Coelho
- Bureau of Safety and Environmental Enforcement, Department of Interior, 45600 Woodland Rd, Sterling, VA, 20166, USA
| | - Cosan Daskiran
- Center for Natural Resources, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd, Newark, NJ, 07102, USA
| | - Brian Robinson
- Department of Fisheries and Oceans, Dartmouth, 1 Challenger Dr, Dartmouth, NS, B2Y 4A2, Canada
| | - Thomas King
- Department of Fisheries and Oceans, Dartmouth, 1 Challenger Dr, Dartmouth, NS, B2Y 4A2, Canada
| | - Kenneth Lee
- Department of Fisheries and Oceans, Dartmouth, 1 Challenger Dr, Dartmouth, NS, B2Y 4A2, Canada
| | - Michal Galus
- Department of Fisheries and Oceans, Ottawa, 200 Kent St, Ottawa, ON, K1A 0E6, Canada
| |
Collapse
|
7
|
Hansen BH, Nordtug T, Øverjordet IB, Altin D, Farkas J, Daling PS, Sørheim KR, Faksness LG. Application of chemical herders do not increase acute crude oil toxicity to cold-water marine species. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 823:153779. [PMID: 35150678 DOI: 10.1016/j.scitotenv.2022.153779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 02/04/2022] [Accepted: 02/06/2022] [Indexed: 06/14/2023]
Abstract
Chemical herders may be used to sequester and thicken surface oil slicks to increase the time window for performing in situ burning of spilled oil on the sea surface. For herder use to be an environmentally safe oil spill response option, information regarding their potential ecotoxicity both alone and in combination with oil is needed. This study aimed at assessing if using herders can cause toxicity to cold-water marine organisms. Our objective was to test the two chemical herders Siltech OP-40 (OP-40) and ThickSlick-6535 (TS-6535) with and without oil for toxicity using sensitive life stages of cold-water marine copepod (Calanus finmarchicus) and fish (Gadus morhua). For herders alone, OP-40 was consistently more toxic than TS-6535. To test herders in combination with oil, low-energy water accommodated fractions (LE-WAFs, without vortex) with Alaskan North Slope crude oils were prepared with and without herders. Dissolution of oil components from surface oil was somewhat delayed following herder application, due to herder-induced reduction in contact area between water and oil. The LE-WAFs were also used for toxicity testing, and we observed no significant differences in toxicity thresholds between treatments to LE-WAFs generated with oil alone and oil treated with herders. The operational herder-to-oil ratio is very low (1:500), and the herders tested in the present work displayed acute toxicity at concentrations well above what would be expected following in situ application. Application of chemical herders to oil slicks is not expected to add significant effects to that of the oil for cold-water marine species exposed to herder-treated oil slicks.
Collapse
Affiliation(s)
| | - Trond Nordtug
- SINTEF Ocean, Climate and Environment, 7465 Trondheim, Norway
| | | | | | - Julia Farkas
- SINTEF Ocean, Climate and Environment, 7465 Trondheim, Norway
| | - Per S Daling
- SINTEF Ocean, Climate and Environment, 7465 Trondheim, Norway
| | | | | |
Collapse
|
8
|
Pandey N, Ojha U. Bio‐based polydimethylsiloxane porous sponge materials with programmable hydrophobicity and porosity for efficient separation of hydrophobic liquids from water. J Appl Polym Sci 2022. [DOI: 10.1002/app.51823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Niharika Pandey
- Department of Chemistry Rajiv Gandhi Institute of Petroleum Technology Jais India
| | - Umaprasana Ojha
- Department of Chemistry Rajiv Gandhi Institute of Petroleum Technology Jais India
| |
Collapse
|
9
|
Nordtug T, Olsen AJ, Wold PA, Salaberria I, Øverjordet IB, Altin D, Kjørsvik E, Hansen BH. The impact of exposure timing on embryo mortality and the partitioning of PAHs when cod eggs are exposed to dispersed and dissolved crude oil. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 229:113100. [PMID: 34923326 DOI: 10.1016/j.ecoenv.2021.113100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 12/02/2021] [Accepted: 12/14/2021] [Indexed: 06/14/2023]
Abstract
During sub-sea oil spills to the marine environment, oil droplets will rise towards the sea surface at a rate determined by their density and diameter as well as the vertical turbulence in the water. Micro-droplets (< 50 µm) are expected to have prolonged residence times in the water column. If present, pelagic fish eggs may thus be exposed to dispersed oil from subsurface oil spills for days, and the contribution of these micro-droplets to toxicity is not well known. The purpose of this work was to investigate to what extent timing of exposure and the presence of oil micro droplets affects PAH uptake and survival of pelagic Atlantic cod eggs. A single batch of eggs was separated in two groups and exposed to dispersions and corresponding water-soluble fraction at 3-7 days (Early exposure) and 9-13 days (Late exposure) post fertilization. Partitioning of PAHs between crude oil microdroplets, water and eggs was estimated as well as the contribution of oil droplets to PAH body residue and acute and delayed mortality. Timing of oil exposure clearly affects both the mortality rate and the timing of mortality. Even though the body residue of PAHs were lower when embryos were exposed in the later embryonic stage, mortality rate increased relative to the early exposure indicating that critical body residue threshold is stage specific. Although our results suggest that the dissolved fraction is the dominating driver for toxicity in cod embryos exposed to oil dispersions, crude oil micro droplets contribute to increased mortality as well.
Collapse
Affiliation(s)
- Trond Nordtug
- SINTEF Ocean, Climate and Environment, 7465 Trondheim, Norway.
| | - Anders J Olsen
- Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway
| | - Per-Arvid Wold
- Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway; Queen Maud University College, 7044 Trondheim, Norway
| | - Iurgi Salaberria
- Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway
| | | | | | - Elin Kjørsvik
- Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway
| | | |
Collapse
|
10
|
Kvæstad B, Hansen BH, Davies E. Automated morphometrics on microscopy images of Atlantic cod larvae using Mask R-CNN and classical machine vision techniques. MethodsX 2021; 9:101598. [PMID: 34917490 PMCID: PMC8666706 DOI: 10.1016/j.mex.2021.101598] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 11/30/2021] [Indexed: 11/29/2022] Open
Abstract
Measurements of morphometrical parameters on i.e., fish larvae are useful for assessing the quality and condition of the specimen in environmental research or optimal growth in the cultivation industry. Manually acquiring morphometrical parameters from microscopy images can be time consuming and tedious, this can be a limiting factor when acquiring samples for an experiment. Mask R-CNN, an instance segmentation neural network architecture, has been implemented for finding outlines on parts of interest on fish larvae (Atlantic cod, Gadus morhua). Using classical machine vision techniques on the outlines makes it is possible to acquire morphometrics such as area, diameter, length, and height. The combination of these techniques is providing accurate-, consistent-, and high-volume information on the morphometrics of small organisms, making it possible to sample more data for morphometric analysis.•Capabilities to automatically analyse a set of microscopy images in approximately 2-3 seconds per image, with results that have a high degree of accuracy when compared to morphometrics acquired manually by an expert.•Can be implemented on other species of ichthyoplankton or zooplankton and has successfully been tested on ballan wrasse, zebrafish, lumpsucker and calanoid copepods.
Collapse
Affiliation(s)
- Bjarne Kvæstad
- SINTEF Ocean, Environment and New Resources, Brattørkaia 17C, Trondheim NO-7010, Norway
| | - Bjørn Henrik Hansen
- SINTEF Ocean, Environment and New Resources, Brattørkaia 17C, Trondheim NO-7010, Norway
| | - Emlyn Davies
- SINTEF Ocean, Environment and New Resources, Brattørkaia 17C, Trondheim NO-7010, Norway
| |
Collapse
|
11
|
Egan AL, Chilvers BL, Cassells S. Does size matter? The direct economic costs associated with the MV Rena oil spill. MARINE POLLUTION BULLETIN 2021; 173:112978. [PMID: 34563961 DOI: 10.1016/j.marpolbul.2021.112978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 09/13/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The MV Rena ran aground on the 5 October 2011 off the coast of New Zealand, releasing over 350 t of heavy fuel oil. The environmental effects of this spill are well documented, however, little research has been undertaken regarding the short term economic losses observed because of the spill. By looking at pre- and post-spill trends for commercial fisheries and tourism in the area, as well as the clean-up and restoration costs, the direct costs associated with the MV Rena oil spill can be estimated. Overall, net losses of NZD 45,479,017 were observed. This research adds to the limited economic reports regarding small/medium oil spills, and demonstrates that even these smaller spills are capable of having a sizeable impact on local economies.
Collapse
Affiliation(s)
- Alexandra L Egan
- School of Veterinary Science, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
| | - B Louise Chilvers
- School of Veterinary Science, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Sue Cassells
- School of Economics & Finance, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| |
Collapse
|
12
|
Hansen BH, Farkas J, Piarulli S, Vicario S, Kvæstad B, Williamson DR, Sørensen L, Davies EJ, Nordtug T. Atlantic cod ( Gadus morhua) embryos are highly sensitive to short-term 3,4-dichloroaniline exposure. Toxicol Rep 2021; 8:1754-1761. [PMID: 34703771 PMCID: PMC8523877 DOI: 10.1016/j.toxrep.2021.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 09/15/2021] [Accepted: 10/09/2021] [Indexed: 11/26/2022] Open
Abstract
3,4-dichloroaniline (3,4-DCA) is one of the most widely produced anilines world-wide, used in plastic packaging, fabrics, pharmaceuticals, pesticides, dyes and paints as well as being a degradation product of several pesticides. 3,4-DCA has been detected in freshwater, brackish and marine environments. Although freshwater toxicity thresholds exist, very little toxicological information is available on marine and cold-water species. In this study, we exposed Atlantic cod (Gadus morhua) embryos (3-7 days post fertilization) to 3,4-DCA concentrations ranging from 8-747 μg/L for 4 days followed by a recovery period in clean sea water until 14 days post fertilization (dpf). The cod embryos were significantly more sensitive to acute 3,4-DCA exposure compared to other species tested and reported in the literature. At the highest concentration (747 μg/L), no embryos survived until hatch, and even at the lowest concentration (8 μg/L), a small, but significant increase in mortality was observed at 14 dpf. Delayed and concentration-dependent effects on surviving yolk-sac larvae, manifested as cardiac, developmental and morphometric alterations, more than a week after exposure suggest potential long-term effects of transient embryonic exposure to low concentrations of 3,4-DCA.
Collapse
Affiliation(s)
| | | | | | - Silvia Vicario
- University of Milano-Bicocca, Piazza della Scienza 1, Milan, Italy
| | | | - David R. Williamson
- SINTEF Ocean, 7465, Trondheim, Norway
- Centre for Autonomous Marine Operations and System (AMOS), Department of Marine Technology, Norwegian University of Science and Technology, NTNU, Norway
| | | | | | | |
Collapse
|
13
|
Hansen BH, Nordtug T, Farkas J, Khan EA, Oteri E, Kvæstad B, Faksness LG, Daling PS, Arukwe A. Toxicity and developmental effects of Arctic fuel oil types on early life stages of Atlantic cod (Gadus morhua). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 237:105881. [PMID: 34139396 DOI: 10.1016/j.aquatox.2021.105881] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 05/18/2021] [Accepted: 05/30/2021] [Indexed: 06/12/2023]
Abstract
Due to the heavy fuel oil (HFO) ban in Arctic maritime transport and new legislations restricting the sulphur content of fuel oils, new fuel oil types are continuously developed. However, the potential impacts of these new fuel oil types on marine ecosystems during accidental spills are largely unknown. In this study, we studied the toxicity of three marine fuel oils (two marine gas oils with low sulphur contents and a heavy fuel oil) in early life stages of cod (Gadus morhua). Embryos were exposed for 4 days to water-soluble fractions of fuel oils at concentrations ranging from 4.1 - 128.3 µg TPAH/L, followed by recovery in clean seawater until 17 days post fertilization. Exposure to all three fuel oils resulted in developmental toxicity, including severe morphological changes, deformations and cardiotoxicity. To assess underlying molecular mechanisms, we studied fuel oil-mediated activation of aryl hydrocarbon receptor (Ahr) gene battery and genes related to cardiovascular, angiogenesis and osteogenesis pathways. Overall, our results suggest comparable mechanisms of toxicity for the three fuel oils. All fuel oils caused concentration-dependant increases of cyp1a mRNA which paralleled ahrr, but not ahr1b transcript expression. On the angiogenesis and osteogenesis pathways, fuel oils produced concentration-specific transcriptional effects that were either increasing or decreasing, compared to control embryos. Based on the observed toxic responses, toxicity threshold values were estimated for individual endpoints to assess the most sensitive molecular and physiological effects, suggesting that unresolved petrogenic components may be significant contributors to the observed toxicity.
Collapse
Affiliation(s)
| | - Trond Nordtug
- SINTEF Ocean, Climate and Environment, Trondheim, Norway
| | - Julia Farkas
- SINTEF Ocean, Climate and Environment, Trondheim, Norway
| | - Essa A Khan
- Norwegian University of Science and Technology, Department of Biology, Trondheim, Norway
| | - Erika Oteri
- Norwegian University of Science and Technology, Department of Biology, Trondheim, Norway
| | - Bjarne Kvæstad
- SINTEF Ocean, Climate and Environment, Trondheim, Norway
| | | | - Per S Daling
- SINTEF Ocean, Climate and Environment, Trondheim, Norway
| | - Augustine Arukwe
- Norwegian University of Science and Technology, Department of Biology, Trondheim, Norway
| |
Collapse
|
14
|
Bender ML, Giebichenstein J, Teisrud RN, Laurent J, Frantzen M, Meador JP, Sørensen L, Hansen BH, Reinardy HC, Laurel B, Nahrgang J. Combined effects of crude oil exposure and warming on eggs and larvae of an arctic forage fish. Sci Rep 2021; 11:8410. [PMID: 33863955 PMCID: PMC8052424 DOI: 10.1038/s41598-021-87932-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 03/30/2021] [Indexed: 02/02/2023] Open
Abstract
Climate change, along with environmental pollution, can act synergistically on an organism to amplify adverse effects of exposure. The Arctic is undergoing profound climatic change and an increase in human activity, resulting in a heightened risk of accidental oil spills. Embryos and larvae of polar cod (Boreogadus saida), a key Arctic forage fish species, were exposed to low levels of crude oil concurrently with a 2.3 °C increase in water temperature. Here we show synergistic adverse effects of increased temperature and crude oil exposure on early life stages documented by an increased prevalence of malformations and mortality in exposed larvae. The combined effects of these stressors were most prevalent in the first feeding larval stages despite embryonic exposure, highlighting potential long-term consequences of exposure for survival, growth, and reproduction. Our findings suggest that a warmer Arctic with greater human activity will adversely impact early life stages of this circumpolar forage fish.
Collapse
Affiliation(s)
- Morgan Lizabeth Bender
- grid.10919.300000000122595234Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| | - Julia Giebichenstein
- grid.10919.300000000122595234Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| | - Ragnar N. Teisrud
- grid.10919.300000000122595234Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| | - Jennifer Laurent
- grid.10919.300000000122595234Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| | - Marianne Frantzen
- grid.417991.30000 0004 7704 0318Akvaplan-Niva, Fram Centre, 9296 Tromsø, Norway
| | - James P. Meador
- grid.422702.10000 0001 1356 4495Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. East, Seattle, Washington, 98112 USA
| | - Lisbet Sørensen
- SINTEF Ocean, Environment and New Resources, 7465 Trondheim, Norway
| | | | - Helena C. Reinardy
- grid.410415.50000 0000 9388 4992Scottish Association for Marine Science, Oban, PA37 1QA UK ,grid.20898.3b0000 0004 0428 2244Department of Arctic Technology, The University Centre in Svalbard, Longyearbyen, Svalbard Norway
| | - Benjamin Laurel
- grid.422702.10000 0001 1356 4495Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Hatfield Marine Science Center, Newport, OR 97365 USA
| | - Jasmine Nahrgang
- grid.10919.300000000122595234Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| |
Collapse
|
15
|
Sørhus E, Donald CE, da Silva D, Thorsen A, Karlsen Ø, Meier S. Untangling mechanisms of crude oil toxicity: Linking gene expression, morphology and PAHs at two developmental stages in a cold-water fish. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 757:143896. [PMID: 33316527 DOI: 10.1016/j.scitotenv.2020.143896] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/17/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
Early life stages of fish are highly sensitive to crude oil exposure and thus, short term exposures during critical developmental periods could have detrimental consequences for juvenile survival. Here we administered crude oil to Atlantic haddock (Melanogrammus aeglefinus) in short term (3-day) exposures at two developmental time periods: before first heartbeat, from gastrulation to cardiac cone stage (early), and from first heartbeat to one day before hatching (late). A frequent sampling regime enabled us to determine immediate PAH uptake, metabolite formation and gene expression changes. In general, the embryotoxic consequences of an oil exposure were more severe in the early exposure animals. Oil droplets on the eggshell resulted in severe cardiac and craniofacial abnormalities in the highest treatments. Gene expression changes of Cytochrome 1 a, b, c and d (cyp1a, b, c, d), Bone morphogenetic protein 10 (bmp10), ABC transporter b1 (abcb1) and Rh-associated G-protein (rhag) were linked to PAH uptake, occurrence of metabolites of phenanthrene and developmental and functional abnormalities. We detected circulation-independent, oil-induced gene expression changes and separated phenotypes linked to proliferation, growth and disruption of formation events at early and late developmental stages. Changes in bmp10 expression suggest a direct oil-induced effect on calcium homeostasis. Localized expression of rhag propose an impact on osmoregulation. Severe eye abnormalities were linked to possible inappropriate overexpression of cyp1b in the eyes. This study gives an increased knowledge about developmentally dependent effects of crude oil toxicity. Thus, our findings provide more knowledge and detail to new and several existing adverse outcome pathways of crude oil toxicity.
Collapse
Affiliation(s)
- Elin Sørhus
- Institute of Marine Research, Bergen, Norway.
| | | | - Denis da Silva
- Northwest Fisheries Science Center (NOAA), 2725 Montlake Blvd. East, Seattle, WA 98112-2097, USA
| | | | | | | |
Collapse
|
16
|
Bioremediation of Diesel Contaminated Marine Water by Bacteria: A Review and Bibliometric Analysis. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9020155] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Oil pollution can cause tremendous harm and risk to the water ecosystem and organisms due to the relatively recalcitrant hydrocarbon compounds. The current chemical method used to treat the ecosystem polluted with diesel is incompetent and expensive for a large-scale treatment. Thus, bioremediation technique seems urgent and requires more attention to solve the existing environmental problems. Biological agents, including microorganisms, carry out the biodegradation process where organic pollutants are mineralized into water, carbon dioxide, and less toxic compounds. Hydrocarbon-degrading bacteria are ubiquitous in the nature and often exploited for their specialty to bioremediate the oil-polluted area. The capability of these bacteria to utilize hydrocarbon compounds as a carbon source is the main reason behind their species exploitation. Recently, microbial remediation by halophilic bacteria has received many positive feedbacks as an efficient pollutant degrader. These halophilic bacteria are also considered as suitable candidates for bioremediation in hypersaline environments. However, only a few microbial species have been isolated with limited available information on the biodegradation of organic pollutants by halophilic bacteria. The fundamental aspect for successful bioremediation includes selecting appropriate microbes with a high capability of pollutant degradation. Therefore, high salinity bacteria are remarkable microbes for diesel degradation. This paper provides an updated overview of diesel hydrocarbon degradation, the effects of oil spills on the environment and living organisms, and the potential role of high salinity bacteria to decontaminate the organic pollutants in the water environment.
Collapse
|
17
|
Everitt S, Fujita KK, MacPherson S, Brinkmann M, Pyle GG, Wiseman S. Toxicity of Weathered Sediment-Bound Dilbit to Early Life Stages of Zebrafish ( Danio rerio). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1721-1729. [PMID: 33449613 DOI: 10.1021/acs.est.0c06349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Due to high viscosity, bitumen extracted from the Alberta oil sands is diluted with natural gas condensates to form diluted bitumen (dilbit) to facilitate transport through pipelines. Dilbit that is spilled into or near a waterbody is subject to environmental weathering processes such as evaporation and interaction with sediments. This is the first study that assessed the toxicity of weathered sediment-bound dilbit (WSD) to fish early life stages. Exposure of zebrafish (Danio rerio) embryos to water-soluble fractions (WSFs) or water-accommodated fractions (WAFs) of WSD from 30 min to 120 h postfertilization resulted in pericardial edema, yolk sac edema, and incidences of uninflated swim bladder. The presence of oil-mineral aggregates (OMAs) in the WAFs greatly increased toxicity, despite all fractions having similar concentrations of dissolved polycyclic aromatic hydrocarbons (PAHs). There were greater cyp1a mRNA abundances in larvae exposed to WAFs, suggesting that there were differences in bioavailability of PAHs between fractions. However, there was little evidence that embryotoxicity was caused by oxidative stress. Results suggest that evaporation and sediment interaction do not completely attenuate toxicity of dilbit to zebrafish early life stages, and OMAs in exposures exacerbate toxicity.
Collapse
Affiliation(s)
- Sean Everitt
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| | - Kaden K Fujita
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| | - Stephanie MacPherson
- Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C8, Canada
| | - Markus Brinkmann
- Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C8, Canada
- School of Environment and Sustainability (SENS), University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C8, Canada
- Global Institute for Water Security, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C8, Canada
| | - Gregory G Pyle
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
- Water Institute for Sustainable Environment, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| | - Steve Wiseman
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
- Water Institute for Sustainable Environment, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| |
Collapse
|
18
|
Beyer J, Goksøyr A, Hjermann DØ, Klungsøyr J. Environmental effects of offshore produced water discharges: A review focused on the Norwegian continental shelf. MARINE ENVIRONMENTAL RESEARCH 2020; 162:105155. [PMID: 32992224 DOI: 10.1016/j.marenvres.2020.105155] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/15/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
Produced water (PW), a large byproduct of offshore oil and gas extraction, is reinjected to formations or discharged to the sea after treatment. The discharges contain dispersed crude oil, polycyclic aromatic hydrocarbons (PAHs), alkylphenols (APs), metals, and many other constituents of environmental relevance. Risk-based regulation, greener offshore chemicals and improved cleaning systems have reduced environmental risks of PW discharges, but PW is still the largest operational source of oil pollution to the sea from the offshore petroleum industry. Monitoring surveys find detectable exposures in caged mussel and fish several km downstream from PW outfalls, but biomarkers indicate only mild acute effects in these sentinels. On the other hand, increased concentrations of DNA adducts are found repeatedly in benthic fish populations, especially in haddock. It is uncertain whether increased adducts could be a long-term effect of sediment contamination due to ongoing PW discharges, or earlier discharges of oil-containing drilling waste. Another concern is uncertainty regarding the possible effect of PW discharges in the sub-Arctic Southern Barents Sea. So far, research suggests that sub-arctic species are largely comparable to temperate species in their sensitivity to PW exposure. Larval deformities and cardiac toxicity in fish early life stages are among the biomarkers and adverse outcome pathways that currently receive much attention in PW effect research. Herein, we summarize the accumulated ecotoxicological knowledge of offshore PW discharges and highlight some key remaining knowledge needs.
Collapse
Affiliation(s)
- Jonny Beyer
- Norwegian Institute for Water Research (NIVA), Oslo, Norway.
| | - Anders Goksøyr
- Department of Biological Sciences, University of Bergen, Norway; Institute of Marine Research (IMR), Bergen, Norway
| | | | | |
Collapse
|
19
|
Zheng Y, Li Y, Yue Z, Li Z, Li X, Wang J. Teratogenic effects of environmentally relevant concentrations of phenanthrene on the early development of marine medaka (Oryzia melastigma). CHEMOSPHERE 2020; 254:126900. [PMID: 32957295 DOI: 10.1016/j.chemosphere.2020.126900] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 06/11/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants in marine environments and have arouse great concern since they pose adverse effects to marine ecosystem. To determine the potential impacts of environmentally relevant PAHs on early life stages of marine fish, this study exposed embryos of marine medaka (Oryzias melastigma) to 0, 2, 10, 50, and 250 μg/L of phenanthrene (Phe), one of the most abundant PAHs. The results demonstrated that Phe exposure decreased hatching rates, delayed hatching time of embryos, and increased deformity rate of newly-hatched larvae. Exposure to 10 and 50 μg/L Phe decreased the survival rate of marine medaka larvae at 28 days post-fertilization (dpf), and no embryo successfully hatched in 250 μg/L Phe exposure group. Morphology results showed that 10, 50, and 250 μg/L Phe exposure significantly retarded the development of embryos, and 2, 10, and 50 μg/L caused yolk sac edema and pericardial edema in newly-hatched larvae, indicating that low concentrations of Phe could induce developmental cardiac toxicity. Furthermore, the changes in the expression of heart development-related genes were determined, and the results showed that Phe-induced cardiac malformation might be related with fgf8, bmp4, smyd1, ATPase and gata4 genes. Overall, environmentally relevant PAHs could disrupt heart morphogenesis and hatching process of marine medaka, which might have profound consequences for sustainability of fish population.
Collapse
Affiliation(s)
- Yuqi Zheng
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Yuejiao Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Zonghao Yue
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, 466001, China
| | - Zuwei Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Xuan Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Jun Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China.
| |
Collapse
|
20
|
Johann S, Nüßer L, Goßen M, Hollert H, Seiler TB. Differences in biomarker and behavioral responses to native and chemically dispersed crude and refined fossil oils in zebrafish early life stages. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 709:136174. [PMID: 31884285 DOI: 10.1016/j.scitotenv.2019.136174] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/10/2019] [Accepted: 12/15/2019] [Indexed: 06/10/2023]
Abstract
Petroleum products including crude oils and refined distillates are unique environmental pollutants consisting of thousands of compounds with varying physical-chemical properties and resulting toxicity for aquatic biota. Hence, for a reliable risk assessment individual petroleum product toxicity profiles are needed. Furthermore, the influence of oil spill response strategies like the application of chemical dispersants has to be implemented. The present study addressed the toxicity of water-accommodated fractions (WAFs) of two different oil types on fish early life stages on different biological organization levels in the laboratory model species Danio rerio. Experiments with a 3rd generation dispersant used in loading rated resembling the exposure in experiments with chemically dispersed oils were included, enabling a direct comparability of results. This approach is of high importance as especially the investigation of dispersant toxicity in relevant exposure concentrations is rather scarce. Zebrafish embryos were exposed to different WAFs shortly after and up to 120 hour post fertilization (hpf). Besides phenotypic effects including edema and spine deformations, reduced responses to dark stimuli, increased CYP1A activity and marginal AChE inhibition were observed in sublethal effect concentrations. Both oil types had varying strength of toxicity, which did not correlate with corresponding chemical analysis of target PAHs. Chemically dispersed oils induced stronger acute toxicity in zebrafish embryos compared to native (initial) oil exposure, which was further reflected by very low exposure concentrations for biomarker endpoints. Based on a comparison to the dispersant alone, a higher toxicity of dispersed oils was related to a combination of dispersant toxicity and an elevated crude oil compound bioavailability, due to dispersion-related partitioning kinetics. In contrast to LEWAF and CEWAF neither typical morphological effects nor mechanism-specific toxicity were observed for the dispersant alone, indicating narcosis as the responsible cause of effects.
Collapse
Affiliation(s)
- Sarah Johann
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany.
| | - Leonie Nüßer
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Mira Goßen
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Henner Hollert
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany; Department of Evolutionary Ecology and Environmental Toxicology, Goethe University Frankfurt, Max-von-Laue-Str. 13, 60438 Frankfurt am Main, Germany
| | - Thomas Benjamin Seiler
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany.
| |
Collapse
|