1
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Zhang J, Kainz MJ, Wang X, Tan X, Zhang Q. Eutrophication and loss of riparian shading influence food quality and trophic relation in stream food webs. WATER RESEARCH 2024; 249:120926. [PMID: 38043353 DOI: 10.1016/j.watres.2023.120926] [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: 03/07/2023] [Revised: 09/28/2023] [Accepted: 11/24/2023] [Indexed: 12/05/2023]
Abstract
Eutrophication induced by excessive inputs of nutrient is one of the main stressors in aquatic ecosystems. Deforestation in riparian zones alter riparian shading, which together with eutrophication is expected to exert a complex control over stream food webs. We manipulated two levels of riparian shading (open canopy vs. shading canopy) and nutrient supply (ambient vs. nutrient addition) in three headwater streams to investigate the individual and combined effects of eutrophication and loss of riparian shading on carbon sources and nutritional quality of biofilms, and the subsequent trophic effects on macroinvertebrate grazers. Nutrient enrichment increased the autochthonous carbon (i.e., algae especially diatoms) indicated by fatty acid (FA) biomarkers within biofilms and grazers. The nutritional quality indicated by eicosapentaenoic acid (EPA) content of biofilms was increased with nutrient enrichment and more so with the combined effect of an increase in riparian shading, consequently leading to an increase in the nutritional quality, density, and biomass of grazers. In particular, the trophic linkages between biofilms and grazers were mainly influenced by EPA concentration in the biofilms, and strengthened with the combined effects of riparian shading and additional nutrients. Our study emphasizes the nutritional significance of EPA for consumers at higher trophic levels and proposes its potential as an indicator for monitoring the health of aquatic ecosystems.
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Affiliation(s)
- Jian Zhang
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences & Hubei Province, Wuhan 430074, China
| | - Martin J Kainz
- WasserCluster Lunz - Inter-University Centre for Aquatic Ecosystem Research, Lunz am See A-3293, Austria; Department of BioMedical Research, Danube University Krems, Krems A-3500, Austria
| | - Xingzhong Wang
- College of Life Science, Huzhou University, Huzhou 313000, China
| | - Xiang Tan
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences & Hubei Province, Wuhan 430074, China.
| | - Quanfa Zhang
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences & Hubei Province, Wuhan 430074, China
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2
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Hallam J, Harris NC. What's going to be on the menu with global environmental changes? GLOBAL CHANGE BIOLOGY 2023; 29:5744-5759. [PMID: 37458101 DOI: 10.1111/gcb.16866] [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: 04/14/2023] [Accepted: 05/13/2023] [Indexed: 07/18/2023]
Abstract
Ongoing anthropogenic change is altering the planet at an unprecedented rate, threatening biodiversity, and ecosystem functioning. Species are responding to abiotic pressures at both individual and population levels, with changes affecting trophic interactions through consumptive pathways. Collectively, these impacts alter the goods and services that natural ecosystems will provide to society, as well as the persistence of all species. Here, we describe the physiological and behavioral responses of species to global changes on individual and population levels that result in detectable changes in diet across terrestrial and marine ecosystems. We illustrate shifts in the dynamics of food webs with implications for animal communities. Additionally, we highlight the myriad of tools available for researchers to investigate the dynamics of consumption patterns and trophic interactions, arguing that diet data are a crucial component of ecological studies on global change. We suggest that a holistic approach integrating the complexities of diet choice and trophic interactions with environmental drivers may be more robust at resolving trends in biodiversity, predicting food web responses, and potentially identifying early warning signs of diversity loss. Ultimately, despite the growing body of long-term ecological datasets, there remains a dearth of diet ecology studies across temporal scales, a shortcoming that must be resolved to elucidate vulnerabilities to changing biophysical conditions.
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Affiliation(s)
- Jane Hallam
- Applied Wildlife Ecology Lab, Yale School of the Environment, Yale University, New Haven, Connecticut, USA
| | - Nyeema C Harris
- Applied Wildlife Ecology Lab, Yale School of the Environment, Yale University, New Haven, Connecticut, USA
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3
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Zhang J, Tan X, Zhang Q. Open riparian canopy and nutrient pollution interactively decrease trophic redundancy and allochthonous resource in streams. ENVIRONMENTAL RESEARCH 2023; 231:116296. [PMID: 37263470 DOI: 10.1016/j.envres.2023.116296] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/25/2023] [Accepted: 05/30/2023] [Indexed: 06/03/2023]
Abstract
Riparian deforestation, which leads to increase in light intensity and excessive nutrient loading in waterways, are two pervasive environmental stressors in the stream ecosystems. Both have been found to alter basal resource availability and consequently stream food webs. However, their interactive effects on trophic structure in stream food webs are unclear. Here, we manipulated light intensity and nutrient availability in three headwater streams to evaluate their effects on consumer diet composition and food web characteristics (i.e., trophic diversity and redundancy) with stable isotope analysis. Dietary analysis revealed that the relative contribution of stream periphyton to the diets of macroinvertebrates increased, while that of allochthonous resources, specifically leaf litter from the terrestrial ecosystems in the catchment, decreased in response to open canopy and nutrient enrichment in the streams. The trophic diversity also increased with the elevated light intensity and nutrient availability, while the trophic redundancy decreased, suggesting a reduced ability of the stream ecosystems to resist environmental changes. Nutrient enrichment also increased the δ15N ratios of periphyton and macroinvertebrates, indicating potential δ15N enrichment of stream benthos by nitrogen pollution. Our results suggested that an increase in light intensity due to riparian canopy openness and stream water nutrient enrichment primarily from human activities have interactive effects on resource flow and trophic structure in stream food webs.
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Affiliation(s)
- Jian Zhang
- Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences, Hubei Province, China
| | - Xiang Tan
- Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences, Hubei Province, China.
| | - Quanfa Zhang
- Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, The Chinese Academy of Sciences, Hubei Province, China
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4
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Wang X, Li J, Tan L, Yao J, Zheng Y, Shen Q, Tan X. The impact of land use on stream macroinvertebrates: a bibliometric analysis for 2010-2021. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:613. [PMID: 37099192 DOI: 10.1007/s10661-023-11235-4] [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: 01/12/2023] [Accepted: 04/10/2023] [Indexed: 06/19/2023]
Abstract
Changes in stream biodiversity are now mainly driven by land-use development. However, a literature review on the impact of land use on stream macroinvertebrates is lacking, especially a scientometric review. Here, we bibliometrically analyzed the literature on land use and stream macroinvertebrates that were published in 2010-2021 and listed in the Web of Science database. We found that the impact of land use on stream macroinvertebrates had been increasingly studied and that these studies were distributed across the globe and had multi-national collaborations. Through co-citation analysis and high-frequency keyword analysis, we found that land use and some environmental factors, especially water quality and habitat, affected macroinvertebrate community biodiversity, biotic integrity, and patterns. Macroinvertebrate traits, analytical methods or models, evaluation index development, and riparian vegetation were the research hotspots. Using historical direct citation network analysis, we also found that the analytical methods in this field and the macroinvertebrate evaluation index had clear development trends from 2010 to 2021. Our findings can help researchers quickly grasp the background of the impact of land use on stream macroinvertebrates and inform future research.
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Affiliation(s)
- Xingzhong Wang
- Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development, College of Life Sciences, Huzhou University, Huzhou, 313000, People's Republic of China
| | - Jie Li
- Department of Cell Biology, School of Life Sciences, Central South University, Changsha , 410013, Hunan, People's Republic of China
| | - Lu Tan
- Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People's Republic of China
| | - Jianliang Yao
- Tonglu Environmental Monitoring Station, Hangzhou, 311500, People's Republic of China
| | - Ying Zheng
- Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development, College of Life Sciences, Huzhou University, Huzhou, 313000, People's Republic of China
| | - Qingna Shen
- School of Geomatics and Municipal Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, People's Republic of China
| | - Xiang Tan
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China.
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5
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Banerji A, Benesh K. Incorporating Microbial Species Interaction in Management of Freshwater Toxic Cyanobacteria: A Systems Science Challenge. AQUATIC ECOLOGY 2022; 3:570-587. [PMID: 36643215 PMCID: PMC9836389 DOI: 10.3390/ecologies3040042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Water resources are critically important, but also pose risks of exposure to toxic and pathogenic microbes. Increasingly, a concern is toxic cyanobacteria, which have been linked to the death and disease of humans, domesticated animals, and wildlife in freshwater systems worldwide. Management approaches successful at reducing cyanobacterial abundance and toxin production have tended to be short-term solutions applied on small scales (e.g., algaecide application) or solutions that entail difficult multifaceted investments (e.g., modification of landscape and land use to reduce nutrient inputs). However, implementation of these approaches can be undermined by microbial species interactions that (a) provide toxic cyanobacteria with protection against the method of control or (b) permit toxic cyanobacteria to be replaced by other significant microbial threats. Understanding these interactions is necessary to avoid such scenarios and can provide a framework for novel strategies to enhance freshwater resource management via systems science (e.g., pairing existing physical and chemical approaches against cyanobacteria with ecological strategies such as manipulation of natural enemies, targeting of facilitators, and reduction of benthic occupancy and recruitment). Here, we review pertinent examples of the interactions and highlight potential applications of what is known.
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Affiliation(s)
- Aabir Banerji
- US Environmental Protection Agency, Office of Research & Development, Duluth, MN 55804, USA
| | - Kasey Benesh
- Oak Ridge Institute for Science & Education, Oak Ridge, TN 37830, USA
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6
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Wang X, Li J, Tan X, Wang W, Zheng Y. Fatty acid composition of macroinvertebrate scrapers in relation to environmental conditions in subtropical mountain streams. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:81037-81047. [PMID: 35727517 DOI: 10.1007/s11356-022-21265-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] [Received: 10/30/2021] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
Biochemical fatty acids (FAs) in vivo are essential to the growth and reproduction of animals including macroinvertebrates in streams and are subject to ambient abiotic variables. However, the main abiotic drivers of FA composition in macroinvertebrate scrapers are varying and uncertain. The aim of this research was to quantify the contributions of abiotic variables, including stream physical, chemical, and climatic variables, to the variation of FAs of macroinvertebrate functional feeding group-scrapers (e.g., Bellamya aeruginosa, Radix swinhoe, Heptagenia sp., and Stenelmis sp.). Stream physical, chemical, and climatic variables and the FAs of scrapers were measured in six subtropical streams during spring. The principal component analysis (PCA) indicated the parameters responsible for FA variation were mainly related to polyunsaturated fatty acids (PUFAs), saturated fatty acids (SAFAs), ω3 PUFA, and ω6 PUFA. Multiple factor analysis (MFA) showed that the FA profiles of scrapers strongly correlated with the physical variables. Specifically, the correlation analysis showed that PUFA and terrestrial FA were significantly positively associated with canopy cover, and in contrast that SAFA was negatively correlated with canopy cover. Although water quality and climate variables did not have a good relationship with FAs, they had a strong correlation with physical variables. This research suggested that the influence of environmental variables (e.g., stream physical, chemical, and climatic variables) on FAs of macroinvertebrate scrapers has complex paths. This study provides a theoretical basis for stream management and an empirical framework for the construction of an interactive network beyond food webs that includes environmental variables.
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Affiliation(s)
- Xingzhong Wang
- Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development, College of Life Sciences, Huzhou University, Huzhou, 313000, People's Republic of China
| | - Jie Li
- Department of Cell Biology, School of Life Sciences, Central South University, Changsha, 410013, Hunan, People's Republic of China
| | - Xiang Tan
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China.
| | - Weibo Wang
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China
| | - Ying Zheng
- Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development, College of Life Sciences, Huzhou University, Huzhou, 313000, People's Republic of China
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7
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Albertson LK, Briggs MA, Maguire Z, Swart S, Cross WF, Twining CW, Wesner JS, Baxter CV, Walters DM. Dietary composition and fatty acid content of giant salmonflies (
Pteronarcys californica
) in two Rocky Mountain rivers. Ecosphere 2022. [DOI: 10.1002/ecs2.3904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
| | | | - Zachary Maguire
- Department of Ecology Montana State University Bozeman Montana USA
| | - Sophia Swart
- Department of Ecology Montana State University Bozeman Montana USA
| | - Wyatt F. Cross
- Department of Ecology Montana State University Bozeman Montana USA
| | - Cornelia W. Twining
- Limnological Institute University of Konstanz Constance Germany
- Department of Migration Max Planck Institute for Animal Behavior Radolfzell Germany
- Department of Fish Ecology and Evolution Eawag Kastanienbaum Switzerland
| | - Jeff S. Wesner
- Department of Biology University of South Dakota Vermillion South Dakota USA
| | - Colden V. Baxter
- Department of Biological Sciences Stream Ecology Center, Idaho State University Pocatello Idaho USA
| | - David M. Walters
- U.S. Geological Survey Columbia Environmental Research Center Columbia Missouri USA
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8
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Dal'Olio Gomes A, Gomes FR, Gücker B, Tolussi CE, Figueredo CC, Boëchat IG, Maruyama LS, Oliveira LC, Muñoz-Peñuela M, Pompêo MLM, de Lima Cardoso R, Marques VH, Moreira RG. Eutrophication effects on fatty acid profiles of seston and omnivorous fish in tropical reservoirs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 781:146649. [PMID: 33794454 DOI: 10.1016/j.scitotenv.2021.146649] [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: 11/12/2020] [Revised: 03/17/2021] [Accepted: 03/17/2021] [Indexed: 06/12/2023]
Abstract
It has been postulated that eutrophication causes replacement of n3 highly unsaturated fatty acids (n3 HUFA) rich taxa, such as Bacillariophyta, Cryptophyta and Dinophyta, with taxa poor in these fatty acids (FA), such as Chlorophyta and Cyanobacteria. Such a change in community composition at the basis of the food web may alter the FA composition of consumer tissues. Here, we investigated the effects of eutrophication on phytoplankton composition and FA profiles of seston and muscle of two omnivorous fish species (Astyanax fasciatus and Astyanax altiparanae) from reservoirs of different trophic status in Southeast Brazil. The phytoplankton composition and seston FA profiles reflected the degree of eutrophication at most of the studied sites. Three of the five most eutrophic sites were dominated by cyanobacteria and had the highest saturated fatty acid (SFA) and lowest polyunsaturated fatty acid (PUFA) relative contents among all sites. In contrast, the remaining two sites presented a higher phytoplankton diversity and higher relative contribution of sestonic PUFAs with 18 carbons (C18) and HUFAs than less eutrophic systems. However, there were no clear effects of sestonic FA profiles on the FA profiles of muscle of both fish species. A higher percentage of n3 HUFAs was found in the fish samples from a hypereutrophic and cyanobacteria dominated reservoir than in those from sites with a more diverse phytoplankton community in which fish mainly showed higher percentages of C18 PUFA. These results suggest a lack of a direct relationship between the degree of eutrophication and the percentage of n3 HUFAs in both fish species, which can be caused by specific characteristics of the reservoirs that may modulate eutrophication effects. Therefore, consumer FA biochemistry seemed to be dictated by their ability to select, accumulate, and modify dietary FAs, rather than by the eutrophication degree of the studied tropical reservoirs.
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Affiliation(s)
- Aline Dal'Olio Gomes
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 101, SP 05508-090, Brazil.
| | - Fernando Ribeiro Gomes
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 101, SP 05508-090, Brazil
| | - Björn Gücker
- Departamento de Geociências, Universidade Federal São João del-Rei, São João del-Rei, MG, Brazil
| | | | - Cleber Cunha Figueredo
- Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Iola Gonçalves Boëchat
- Departamento de Geociências, Universidade Federal São João del-Rei, São João del-Rei, MG, Brazil
| | | | - Lucas Chagas Oliveira
- Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Marcela Muñoz-Peñuela
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 101, SP 05508-090, Brazil
| | | | - Rayssa de Lima Cardoso
- Universidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, Sorocaba, Brazil
| | - Victor Hugo Marques
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 101, SP 05508-090, Brazil
| | - Renata Guimarães Moreira
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 101, SP 05508-090, Brazil
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Twining CW, Razavi NR, Brenna JT, Dzielski SA, Gonzalez ST, Lawrence P, Cleckner LB, Flecker AS. Emergent Freshwater Insects Serve as Subsidies of Methylmercury and Beneficial Fatty Acids for Riparian Predators Across an Agricultural Gradient. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:5868-5877. [PMID: 33878866 DOI: 10.1021/acs.est.0c07683] [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] [Indexed: 06/12/2023]
Abstract
Aquatic-to-terrestrial subsidies have the potential to provide riparian consumers with benefits in terms of physiologically important organic compounds like omega-3 long-chain polyunsaturated fatty acids (n-3 LCPUFAs). However, they also have a "dark side" in the form of exposure to toxicants such as mercury. Human land use intensity may also determine whether subsidies provide benefits or come at a cost for riparian predators. We sampled insects as well as Eastern Phoebe (Sayornis phoebe) chicks in 2015-2016 within the southern Finger Lakes region to understand how food quality, in terms of n-3 LCPUFAs and methylmercury (MeHg), of emergent freshwater insects compared with that of terrestrial insects and how land use affected the quality of prey, predator diet composition, and MeHg exposure. Across the landscape, freshwater insects had a significantly higher percentage of the n-3 LCPUFA eicosapentaenoic acid (EPA) compared to terrestrial insects and contained significantly more MeHg than terrestrial insects did. In spite of differences in MeHg concentrations between aquatic and terrestrial insects, chick MeHg concentrations were not related to diet composition. Instead, chick MeHg concentrations increased with several metrics of human land use intensity, including percent agriculture. Our findings suggest that freshwater subsidies provide predators with both risks and benefits, but that predator MeHg exposure can vary with human land use intensity.
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Affiliation(s)
- Cornelia W Twining
- Max Planck Institute of Animal Behavior 78315 Radolfzell, Germany
- Limnological Institute, University of Konstanz 78464 Konstanz, Germany
| | - N Roxanna Razavi
- Department of Environmental Biology, State University of New York College of Environmental Science and Forestry Syracuse, New York 13210, United States
| | - J Thomas Brenna
- Division of Nutritional Sciences, Cornell University Ithaca, New York 14850, United States
- University of Texas, Austin, Dell Pediatric Research Center Austin, Texas 78712, United States
| | - Sarah A Dzielski
- Department of Environmental Biology, State University of New York College of Environmental Science and Forestry Syracuse, New York 13210, United States
| | - Sara T Gonzalez
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz Santa Cruz, California 95064, United States
| | - Peter Lawrence
- Division of Nutritional Sciences, Cornell University Ithaca, New York 14850, United States
| | - Lisa B Cleckner
- Hobart and William Smith Colleges, Finger Lakes Institute Geneva, New York 14456, United States
| | - Alexander S Flecker
- Department of Ecology and Evolutionary Biology, Cornell University Ithaca, New York 14850, United States
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10
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Manning DWP, Sullivan SMP. Conservation Across Aquatic-Terrestrial Boundaries: Linking Continental-Scale Water Quality to Emergent Aquatic Insects and Declining Aerial Insectivorous Birds. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.633160] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Larval aquatic insects are used to assess water quality, but less attention is paid to their adult, terrestrial life stage, which is an important food resource for declining aerial insectivorous birds. We used open-access water-quality, aquatic-invertebrate, and bird-survey data to study how impaired water quality can emanate from streams and lakes through changes in aquatic insect communities across the contiguous United States. Emergent insect relative abundance was highest across the West, in northern New England, and the Carolinas in streams, and highest near the Great Lakes, parts of the Southwest, and northern New England for lakes. Emergent insects declined with sedimentation, roads, and elevated ammonium concentrations in streams, but not lakes. The odds that a given taxon would be non-emergent increased by up to 2.0× as a function of pollution tolerance, underscoring the sensitivity of emergent aquatic insects to water-quality impairment. However, relationships between bird populations and emergent insects were generally weak for both streams and lakes. For streams, we observed the strongest positive relationships for a mixture of upland and riparian aerial insectivorous birds such as Western Wood-Pewee, Olive-sided Flycatcher, and Acadian Flycatcher and the strongest negative association for Purple Martin. Different avian insectivores responded to emergent insect abundances in lakes (e.g., Barn Swallow, Chimney Swift, Eastern Wood-Pewee, Common Nighthawk). In both streams and lakes, we observed stronger, but opposing, relationships between several aerial insectivores and the relative abundance of sensitive insect orders (E)phemeroptera, (P)lecoptera, and (T)richoptera (positive), and pollution tolerant individuals (negative). Overall, our findings indicate that emergent insects are negatively correlated with pollution tolerance, suggesting a large-scale loss of this nutritional subsidy to terrestrial environments from impaired aquatic ecosystems. While some bird populations tracked scarcities of emergent aquatic insects, especially EPT taxa, responses varied among species, suggesting that unique habitat and foraging behaviors likely complicated these relationships. Strengthening spatial and temporal concordance between emergent-insect and bird-survey data will improve our ability to interpret species-level responses over time. Thus, our analysis highlights the need for developing conservation and biomonitoring strategies that consider the cross-ecosystem effects of water quality declines for threatened insectivorous avifauna and other terrestrial wildlife.
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11
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Furey PC, Lee SS, Clemans DL. Substratum-associated microbiota. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2020; 92:1629-1648. [PMID: 33463854 DOI: 10.1002/wer.1410] [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: 04/30/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 06/12/2023]
Abstract
Highlights of new, interesting, and emerging research findings on substratum-associated microbiota covered from a survey of 2019 literature from primarily freshwaters provide insight into research trends of interest to the Water Environment Federation and others interested in benthic, aquatic environments. Coverage of topics on bottom-associated or attached algae and cyanobacteria, though not comprehensive, includes new methods, taxa new-to-science, nutrient dynamics, auto- and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, and bloom-forming and harmful algae. Coverage of bacteria, also not comprehensive, focuses on the ecology of benthic biofilms and microbial communities, along with the ecology of microbes like Caulobacter crescentus, Rhodobacter, and other freshwater microbial species. Bacterial topics covered also include metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. Readers may use this literature review to learn about or renew their interest in the recent advances and discoveries regarding substratum-associated microbiota. PRACTITIONER POINTS: This review of literature from 2019 on substratum-associated microbiota presents highlights of findings on algae, cyanobacteria, and bacteria from primarily freshwaters. Coverage of algae and cyanobacteria includes findings on new methods, taxa new to science, nutrient dynamics, auto- and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, bloom-forming and harmful algae. Coverage of bacteria includes findings on ecology of benthic biofilms and microbial communities, the ecology of microbes, metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. Highlights of new, noteworthy and emerging topics build on those from 2018 and will be of relevance to the Water Environment Federation and others interested in benthic, aquatic environments.
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Affiliation(s)
- Paula C Furey
- Department Biology, St. Catherine University, St. Paul, Minnesota, USA
| | - Sylvia S Lee
- Office of Research and Development, U.S. Environmental Protection Agency, Washington, District of Columbia, USA
| | - Daniel L Clemans
- Department of Biology, Eastern Michigan University, Ypsilanti, Michigan, USA
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12
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Bellinger BJ, Cook MI, Hagerthey SE, Newman S, Kobza RM. Lipid Composition Differences of Periphyton, Crustaceans, and Small Fishes in Response to Eutrophication and Management in the Florida Everglades, USA. Lipids 2020; 56:31-47. [PMID: 32777095 DOI: 10.1002/lipd.12272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 05/20/2020] [Accepted: 07/08/2020] [Indexed: 11/07/2022]
Abstract
Eutrophication of the Florida Everglades, USA, has altered the characteristics of the ecosystem, but management strategies are being implemented to accelerate recovery. In this study, we described lipid compositional similarities and differences between periphyton, fish, and crustaceans, and explored if eutrophication and creation of new open-water sloughs in phosphorus (P)-impacted regions of a Northern Everglades impoundment resulted in changes in periphyton biomass and lipid composition, and the lipid composition of a ubiquitous omnivore, Gambusia holbrooki. Lipid biomarker analysis provided insight into microbial community composition, quality of basal resources, and potential resources utilized by consumers. Periphyton biomass and phospholipid fatty acid (PLFA) composition differed in response to eutrophication, but not between P-impacted control and treatment plots. Shifts in relative abundances of lipids indicative of diatoms and green algae mirrored known taxonomic shifts due to eutrophication. For fauna, PLFA were a small and relatively distinct component of the overall total lipid make-up, and profiles were similar between control and treatment plots. However, the PLFA profile of G. holbrooki differed between oligotrophic and eutrophic regions. Fish and crustacean lipids contained significantly greater relative abundances of polyunsaturated fatty acids than were found in periphyton, and profiles differed between fish and crustaceans, suggesting organisms were selectively accumulating or elongating and desaturating lipids de novo, to meet physiological needs. This study builds on findings of microbial responses to eutrophication and recent observations that consumer PLFA profiles can also shift with P-enrichment.
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Affiliation(s)
- Brent J Bellinger
- City of Austin, Watershed Protection Department, 505 Barton Springs Rd. 11th floor, Austin, TX, 78704, USA
| | - Mark I Cook
- Everglades Systems Assessment Section, South Florida Water Management District, 3301 Gun Club Rd. West Palm Beach, FL, 33406, USA
| | - Scot E Hagerthey
- US EPA, Office of Research and Development, National Center for Ecosystem Assessment, 1200 Pennsylvania Ave., Washington, DC, 20460, USA
| | - Susan Newman
- Everglades Systems Assessment Section, South Florida Water Management District, 3301 Gun Club Rd. West Palm Beach, FL, 33406, USA
| | - Robert M Kobza
- Boulder County, Parks and Open Space Department, 5201 St. Vrain Rd., Longmont, CO, 80503, USA
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Fadhlaoui M, Laderriere V, Lavoie I, Fortin C. Influence of Temperature and Nickel on Algal Biofilm Fatty Acid Composition. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2020; 39:1566-1577. [PMID: 32367541 DOI: 10.1002/etc.4741] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/19/2020] [Accepted: 04/30/2020] [Indexed: 06/11/2023]
Abstract
Freshwater biofilms play an important role in aquatic ecosystems and are widely used to evaluate environmental conditions. Little is known about the effects of temperature and metals on biofilm fatty acid composition. In the present study, we exposed a natural biofilm cultured in mesocosms to a gradient of nickel (Ni) concentrations at 15 and 21 °C for 28 d. Metal bioaccumulation, algal taxonomic composition, and biofilm fatty acid profiles were determined. At both temperatures, bioaccumulated Ni increased with Ni exposure concentration and reached the highest values at 25 µM Ni, followed by a decrease at 55 and 105 µM Ni. In control biofilms, palmitic acid (16:0), palmitoleic acid (16:1n7), oleic acid (18:1n9), linoleic acid (18:2n6), and linolenic acid (18:3n3) were the dominant fatty acids at 15 and 21 °C. This composition suggests a dominance of cyanobacteria and green algae, which was subsequently confirmed by microscopic observations. The increase in temperature resulted in a decrease in the ratio of unsaturated to saturated fatty acids, which is considered to be an adaptive response to temperature variation. Polyunsaturated fatty acids (PUFAs) tended to decrease along the Ni gradient, as opposed to saturated fatty acids which increased with Ni concentrations. Temperature and Ni affected differently the estimated desaturase and elongase activities (product/precursor ratios). The increase in PUFAs at 15 °C was concomitant to an increase in Δ9-desaturase (D9D). The estimated activities of D9D, Δ12-desaturase, and Δ15-desaturase decreased along the Ni gradient and reflected a decline in PUFAs. The elevated estimated elongase activity reflected the observed increase in saturated fatty acids at the highest Ni exposure concentration (105 µM). Our results suggest that fatty acids could be used as an endpoint to evaluate environmental perturbations. Environ Toxicol Chem 2020;39:1566-1577. © 2020 SETAC.
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Affiliation(s)
- Mariem Fadhlaoui
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec, Canada
| | - Vincent Laderriere
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec, Canada
| | - Isabelle Lavoie
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec, Canada
| | - Claude Fortin
- Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, Québec, Canada
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