Assessing the Impact of Multiple Stressors on Aquatic Biota: The Receptor’s Side Matters

Segner, Helmut; Schmitt‐Jansen, Mechthild; Sabater, Sergi

doi:10.1021/es405082t

Cited by 149 publications

(143 citation statements)

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“…Chemical contamination also counts as a widespread stressor in freshwater ecosystems (Segner et al, 2014). This is especially the case in rivers draining agricultural areas, where the diffuse pollution of pesticides to freshwaters can reduce the LLD process (Piscart et al, 2011 andRasmussen et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

“…However, the combined effects of these two stressors on aquatic ecosystem functioning remain to be determined. Current approaches to hazard and risk assessment mainly focus on single stressor effects, yet there is a pressing need for better knowledge on how multiple stressors can affect aquatic biota and functioning (Segner et al, 2014). Here we performed a 40-day laboratory microcosm experiment to assess the individual and combined effects of drought and fungicide (TBZ) on leaf-associated microbial (fungi and bacteria) communities responsible for LLD, including subsequent modification of leaf palatability for invertebrate shredders.…”

Section: Introductionmentioning

confidence: 99%

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Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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Highlights• The combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition (LLD) were assessed.• TBZ applied alone had no significant effect on LLD.• Drought strongly impacted the microbial LLD process and led to cascading effects on Gammarus feeding.• Structural and functional effects increased when drought and TBZ were applied simultaneously. AbstractLoss of biodiversity and altered ecosystem functioning are driven by the cumulative effects of multiple natural and anthropogenic stressors affecting both quantity and quality of water resources. Here we performed a 40-day laboratory microcosm experiment to assess the individual and combined effects of drought and the model fungicide tebuconazole (TBZ) on leaf litter decomposition (LLD), a fundamental biogeochemical process in freshwater ecosystems. Starting out from a worst-case scenario perspective, leaf-associated microbial communities were exposed to severe drought conditions (four 5-day drought periods alternated with 4-day immersion periods) and/or a chronic exposure to TBZ (nominal concentration of 20 µg L−1). We assessed the direct effects of drought and fungicide on the structure (biomass, diversity) and activity (extracellular enzymatic potential) of fungal and bacterial assemblages colonizing leaves. We also investigated indirect effects on the feeding rates of the amphipod Gammarus fossarum on leaves previously exposed to drought and/or TBZ contamination. Results indicate a stronger effect of drought stress than fungicide contamination under the experimental conditions applied. Indeed, the drought stress strongly impacted microbial community structure and activities, inhibiting the LLD process and leading to cascading effects on macroinvertebrate feeding. However, despite the lack of significant effect of TBZ applied alone, the effects of drought on microbial functions (i.e., decrease in LLD and in enzymatic activities) and on Gammarus feeding rates were more pronounced when drought and TBZ stresses were applied together. In a perspective of ecological risk assessment and ecosystem management for sustainability, these findings stress the need for deeper insight into how multiple stressors can affect the functioning of aquatic ecosystems and associated services.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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“…Meeting the challenge of predicting the impacts of multiple threats requires greater attention to the attributes of response metrics, rather than a sole focus on the description of alterations (Segner et al, 2014). Nevertheless, logistic constraints may impinge on threat impact assessments (e.g., limited time, money, and personnel), and there remains an ongoing challenge of choosing metrics that best quantify the effects of multiple threats and their associated alterations.…”

Section: Determining How To Measure the Effects Of Multiple Threatsmentioning

confidence: 99%

“…Scientists are challenged to develop metrics that are suitable for quantifying the impacts of multiple threats, design experiments that reveal interactions between threats, discover mechanisms of action, and disentangle effects (Segner et al, 2014;Nõges et al, 2016). Practitioners are confronted by the reality that existing tools -including restoration, upland practices, protection, and policy -may be incapable of addressing a full suite of threats and effects.…”

Section: Introductionmentioning

confidence: 99%

Meeting the challenge of interacting threats in freshwater ecosystems: A call to scientists and managers

Craig

Olden

Arthington

et al. 2017

Elementa: Science of the Anthropocene

103

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Human activities create threats that have consequences for freshwater ecosystems and, in most watersheds, observed ecological responses are the result of complex interactions among multiple threats and their associated ecological alterations. Here we discuss the value of considering multiple threats in research and management, offer suggestions for filling knowledge gaps, and provide guidance for addressing the urgent management challenges posed by multiple threats in freshwater ecosystems. There is a growing literature assessing responses to multiple alterations, and we build off this background to identify three areas that require greater attention: linking observed alterations to threats, understanding when and where threats overlap, and choosing metrics that best quantify the effects of multiple threats. Advancing science in these areas will help us understand existing ecosystem conditions and predict future risk from multiple threats. Because addressing the complex issues and novel ecosystems that arise from the interaction of multiple threats in freshwater ecosystems represents a significant management challenge, and the risks of management failure include loss of biodiversity, ecological goods, and ecosystem services, we also identify actions that could improve decision-making and management outcomes. These actions include drawing insights from management of individual threats, using threat attributes (e.g., causes and spatio-temporal dynamics) to identify suitable management approaches, testing management strategies that are likely to be successful despite uncertainties about the nature of interactions among threats, avoiding unintended consequences, and maximizing conservation benefits. We also acknowledge the broadly applicable challenges of decision-making within a socio-political and economic framework, and suggest that multidisciplinary teams will be needed to innovate solutions to meet the current and future challenge of interacting threats in freshwater ecosystems.

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“…Moreover, tools that allow for the detection of effects on ecosystem processes and in turn for the evaluation of the consequences of such effects for ecosystem services are relevant for river managers to balance management measures and to highlight the relevance of measures to the public and stakeholders potentially involved in decision-making. Additional research in the abovementioned areas is needed to deliver such tools, though several promising avenues exist (Brack et al 2015;Segner et al 2014). …”

Section: Assessing and Predicting Impacts Of Chemicals In River Systemsmentioning

confidence: 99%

Riverine Ecosystem Management

Schmutz¹,

Sendzimir²

2018

129

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Open Access This book is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author (s) and the source, provide a link to the Creative Commons license and indicate if changes were made. The images or other third party material in this book are included in the book's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the book's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Printed on acid-free paperThis Springer imprint is published by the registered company Springer International Publishing AG part of Springer Nature. The registered company address is: Gewerbestrasse 11, 6330 Cham, Switzerland Challenges in Riverine Ecosystem Management Jan Sendzimir and Stefan SchmutzThis book is dedicated to those interested in the natural and social sciences and elements of governance that will support the sustainable management of rivers and aquatic ecosystems. Since elements of nature and society interact to determine the integrity and trajectory of these systems, they are referred to hereafter as socialecological systems (SESs). This introduction opens the door to these topics in four steps. It begins by explaining why a book dedicated to river management and science is needed at this point. In the second part, it outlines the history of some of the major developments that challenge the integrity of SESs worldwide. In the third part, it describes several of the principal tools used to study as well as manage SES. Tools to measure the degree of degradation of an SES include indicators of biological integrity, ecosystem health, and resilience. Tools to assess and manage the trajectory of an SES include the DPSIR and adaptive management. The introduction closes by outlining the structure of the book through the progression of its chapters. Justification of BookRivers are among the most threatened ecosystems of the world. For more than a centur...

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Assessing the Impact of Multiple Stressors on Aquatic Biota: The Receptor’s Side Matters

Cited by 149 publications

References 81 publications

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Meeting the challenge of interacting threats in freshwater ecosystems: A call to scientists and managers

Riverine Ecosystem Management

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