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Suzuki H, Makino W, Takahashi S, Urabe J. Assessment of toxic effects of imidacloprid on freshwater zooplankton: An experimental test for 27 species. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172378. [PMID: 38604362 DOI: 10.1016/j.scitotenv.2024.172378] [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: 12/04/2023] [Revised: 04/03/2024] [Accepted: 04/08/2024] [Indexed: 04/13/2024]
Abstract
The neonicotinoid pesticide imidacloprid has been used worldwide since 1992. As one of the most important chemicals used in pest control, there have been concerns that its run-off into rivers and lakes could adversely affect aquatic ecosystems, where zooplankton play a central role in the energy flow from primary to higher trophic levels. However, studies assessing the effects of pesticides at the species level have relied on a Daphnia-centric approach, and no studies have been conducted using species-level assessments on a broad range of zooplankton taxa. In the present study, we therefore investigated the acute toxicity of imidacloprid on 27 freshwater crustacean zooplankton (18 cladocerans, 3 calanoid copepods and 6 cyclopoid copepods). The experiment showed that a majority of calanoid copepods and cladocerans were not affected at all by imidacloprid, with the exception of one species each of Ceriodaphnia and Diaphasoma, while all six cyclopoid copepods showed high mortality rates, even at concentrations of imidacloprid typically found in nature. In addition, we found a remarkable intra-taxonomic variation in susceptibility to this chemical. As many cyclopoid copepods are omnivorous, they act as predators as well as competitors with other zooplankton. Accordingly, their susceptibility to imidacloprid is likely to cause different responses at the community level through changes in predation pressure as well as changes in competitive interactions. The present results demonstrate the need for species-level assessments of various zooplankton taxa to understand the complex responses of aquatic communities to pesticide disturbance.
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Affiliation(s)
- Hiromichi Suzuki
- Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi 980-8578, Japan.
| | - Wataru Makino
- Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Shinji Takahashi
- Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - Jotaro Urabe
- Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi 980-8578, Japan
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Oda Y, Miyabara Y. Grazing inhibition in Daphnia and Bosmina by colony formation of Desmodesmus subspicatus triggered by sodium octyl sulfate. ECOTOXICOLOGY (LONDON, ENGLAND) 2023; 32:884-894. [PMID: 37676551 DOI: 10.1007/s10646-023-02694-z] [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] [Accepted: 08/24/2023] [Indexed: 09/08/2023]
Abstract
There are growing concerns that several aquatic contaminants can indirectly alter biological interactions by inhibiting the adaptive phenotypic plasticity of organisms, even at nonlethal concentrations. In Scenedesmaceae, a family of green algae, many chemicals interfere with defensive colony formation against grazers (i.e., through induced or limited coloniality). Although several studies have demonstrated that the effects of coloniality can limit the feeding capacity of Daphnia spp., grazing inhibition in other zooplankton species is not well understood. In this study, we examined the influence of sodium octyl sulfate (SOS) on the growth and morphology of Desmodesmus subspicatus and on the feeding rates of three cladoceran species (Daphnia galeata, Bosmina longirostris, and Bosmina fatalis) feeding on SOS-induced colonies under factorial conditions of different food levels and grazer ages. SOS remarkably induced colony formation with no observed effect on growth in D. subspicatus. D. galeata and B. fatalis showed a remarkable reduction in feeding rates when they fed on colonial D. subspicatus, whereas no significant effect of the prey morphotype was found on the feeding rates of B. longirostris. Microscopic observations of algal morphology after being grazed showed that each species can consume colonial prey depending on food level and age. Comparisons of the inhibition ratio of feeding among the three cladocerans revealed that Daphnia was more sensitive to prey coloniality compared with Bosmina. Our findings provide specific insights into the effects of chemically interfered colony formation on population dynamics and community structures.
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Affiliation(s)
- Yusuke Oda
- Department of Science and Technology, Shinshu University, Matsumoto, Nagano, Japan.
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.
| | - Yuichi Miyabara
- Suwa Hydrobiological Station, Faculty of Science, Shinshu University, Suwa, Nagano, Japan
- Institute of Mountain Science, Shinshu University, Minamiminowa, Nagano, Japan
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Poikane S, Kelly MG, Várbíró G, Borics G, Erős T, Hellsten S, Kolada A, Lukács BA, Lyche Solheim A, Pahissa López J, Willby NJ, Wolfram G, Phillips G. Estimating nutrient thresholds for eutrophication management: Novel insights from understudied lake types. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 827:154242. [PMID: 35245557 DOI: 10.1016/j.scitotenv.2022.154242] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/10/2022] [Accepted: 02/26/2022] [Indexed: 06/14/2023]
Abstract
Nutrient targets based on pressure-response models are essential for defining ambitions and managing eutrophication. However, the scale of biogeographical variation in these pressure-response relationships is poorly understood, which may hinder eutrophication management in regions where lake ecology is less intensively studied. In this study, we derive ecology-based nutrient targets for five major ecoregions of Europe: Northern, Central-Baltic, Alpine, Mediterranean and Eastern Continental. As a first step, we developed regressions between nutrient concentrations and ecological quality ratios (EQR) based on phytoplankton and macrophyte communities. Significant relationships were established for 13 major lake types; in most cases, these relationships were stronger for phosphorus than for nitrogen, and stronger for phytoplankton than for macrophytes. Using these regressions, we estimated the total phosphorus (TP) and total nitrogen (TN) concentrations at which lakes of different types are likely to achieve good ecological status. However, in the very shallow lakes of the Eastern Continental region, relations between nutrient and biological communities were weak or non-significant. This can be attributed to high nutrient concentrations (in the asymptotic zone of phosphorus-phytoplankton models) suggesting other factors (light, grazing) limit primary production. However, we also show that fish stocking is a major pressure on Eastern Continental lakes, negatively affecting ecological status: lakes with low fish stocking show low chlorophyll-a concentrations and good ecological status despite high nutrient levels, while the lakes with high fish stocking show high chlorophyll-a and low ecological status. This study highlights the need to better understand lakes in biogeographic regions that have been, for historical reasons, less studied. This, in turn, helps reveal factors that challenge the dominant paradigms of lake assessment and management.
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Affiliation(s)
- Sandra Poikane
- European Commission, Joint Research Centre (JRC), I-21027 Ispra, Italy.
| | - Martyn G Kelly
- Bowburn Consultancy, 11 Monteigne Drive, Bowburn, Durham DH6 5QB, UK; Department of Geography, Nottingham University, Nottingham NG7 2RD, UK
| | - Gábor Várbíró
- Department of Tisza Research, Institute of Aquatic Ecology, Centre for Ecological Research, Bem tér 18/c, H-4026 Debrecen, Hungary
| | - Gábor Borics
- Department of Tisza Research, Institute of Aquatic Ecology, Centre for Ecological Research, Bem tér 18/c, H-4026 Debrecen, Hungary
| | - Tibor Erős
- Balaton Limnological Research Institute, ELKH, Klebelsberg K. u. 3, H-8237 Tihany, Hungary
| | - Seppo Hellsten
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790 Helsinki, Finland
| | - Agnieszka Kolada
- Institute of Environmental Protection-National Research Institute, Krucza 5/11D, 00-548 Warsaw, Poland
| | - Balázs András Lukács
- Department of Tisza Research, Institute of Aquatic Ecology, Centre for Ecological Research, Bem tér 18/c, H-4026 Debrecen, Hungary
| | - Anne Lyche Solheim
- Norwegian Institute of Water Research, NIVA, Gaustadalleen 21, 0349 Oslo, Norway
| | - José Pahissa López
- Tragsatec, Gerencia de Gestión y Planificación Hídrica, Julián Camarillo 6B, 28037 Madrid, Spain
| | - Nigel J Willby
- School of Biological and Environmental Sciences, University of Stirling, Stirling FK9 4LA, UK
| | - Georg Wolfram
- DWS Hydro-Ökologie, Zentagasse 47, 1050 Vienna, Austria
| | - Geoff Phillips
- School of Biological and Environmental Sciences, University of Stirling, Stirling FK9 4LA, UK
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Yin C, Gong L, Chen Y, Ni L, Pitcher TJ, Kang B, Guo L. Modeling ecosystem impacts of the invasive Japanese smelt Hypomesus nipponensis in Lake Erhai, southwestern China. ECOL INFORM 2022. [DOI: 10.1016/j.ecoinf.2021.101488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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