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Title: Disentangling responses to natural stress and human impact gradients in river ecosystems across Europe
Authors: Stubbington, Rachel
Sarremejane, Romain
Laini, Alex
Cid, Nuria
Csabai, Zoltan
England, Judy
Munné, Antoni
Aspin, Tom
et al.
Editors: Wiley & Sons Ltd, John
Keywords: bioassessmen
flow intermittence
intermittent river,
multiple stressors
resistance and resilience
temporary streams
Issue Date: 1-Nov-2021
Publisher: J Appl Ecol.
Citation: 1. Stubbington Rachel; Sarremejane Romain; Laini Alex; Cid Núria; Csabai Zoltan; England Judy; Munné Antoni; Aspin Tom; Bonada Núria; Bruno-Collados Daniel; Cauvy-Fraunie Sophie; Chadd Richard; Dienstl Claudia; Fortuño Pau; Graf Wolfram; Gutiérrez-Cánovas Cayetano; House Andy; Karouzas Ioannis; Kazila Eleana; Millan Andres; Morais Manuela; Paril Petr; Pickwell Alex; Polášek Marek; Sánchez-Fernández David; Tziortzis Iakovos ; Walker-Holden Emma; White James; Varbiro Gabor; Voreadou Catherina; Datry Thibault, 2022 Disentangling responses to natural stress and human impact gradients in river ecosystems across Europe. J Appl Ecol., 59: 537–548.
Abstract: Rivers are dynamic ecosystems in which both human impacts and climate-driven drying events are increasingly common. These anthropogenic and natural stress-ors interact to influence the biodiversity and functioning of river ecosystems. Disentangling ecological responses to these interacting stressors is necessary to guide management actions that support ecosystems adapting to global change. We analysed the independent and interactive effects of human impacts and natu-ral drying on aquatic invertebrate communities—a key biotic group used to assess the health of European freshwaters. We calculated biological response metrics representing communities from 406 rivers in eight European countries: taxonomic richness, functional richness and redundancy, and biomonitoring indices that in-dicate ecological status. We analysed metrics based on the whole community and on a group of taxa with traits promoting resistance and/or resilience (‘high RR’) to drying. We also examined how responses vary across Europe in relation to climatic aridity. Most community metrics decreased independently in response to impacts and drying. A richness-independent biomonitoring index (the average score per taxon; ASPT) showed particular potential for use in biomonitoring, and should be consid-ered alongside new metrics representing high RR diversity, to promote accurate assessment of ecological status. High RR taxonomic richness responded only to impacts, not drying. However, these predictors explained little variance in richness and other high RR metrics, potentially due to low taxonomic richness. Metric responsiveness could thus be enhanced by developing region-specific high RR groups comprising sufficient taxa with sufficiently variable impact sensitivities to indicate ecological status.5. Synthesis and applications. Metrics are needed to assess the ecological status of dy-namic river ecosystems—including those that sometimes dry and thus to identify priority sites requiring action to tackle the causes of environmental degradation. Our results inform recommendations guiding the development of such metrics. We propose concurrent use of richness-independent ‘average score per taxon’ indices and metrics that characterize the richness of resistant and resilient taxa. We observed interactions between aridity, impacts and drying, highlighting that these new metrics should be region specific, river type specific and adaptable, promoting their ability to inform management actions that protect biodiversity in river ecosystems responding to climate change
Type: article
Appears in Collections:BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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