A global perspective on the functional responses of stream communities to flow intermittence

The current erosion of biodiversity is a major concern that threatens the ecological integrity of ecosystems and the ecosystem services they provide. Due to global change, an increasing proportion of river networks are drying and changes from perennial to non‐perennial flow regimes represent dramati...

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Vydané v:	Ecography (Copenhagen) Ročník 44; číslo 10; s. 1511 - 1523
Hlavní autori:	Crabot, Julie, Mondy, Cedric P., Usseglio‐Polatera, Philippe, Fritz, Ken M., Wood, Paul J., Greenwood, Michelle J., Bogan, Michael T., Meyer, Elisabeth I., Datry, Thibault
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Oxford, UK Blackwell Publishing Ltd 01.10.2021 John Wiley & Sons, Inc Wiley
Predmet:	Biodiversity Biodiversity loss Body size Drying Ecology Ecosystem dynamics Ecosystem integrity Ecosystem services ecosystems Environmental Sciences Fecundity Flow fragmentation Functional groups global change Integrity Life span life-history traits longevity Macroinvertebrates Networks Redundancy River networks Rivers species diversity streams Taxonomy temporary rivers biodiversity loss life-history traits temporary rivers global change fragmentation
ISSN:	0906-7590, 1600-0587
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Popis
Shrnutí:	The current erosion of biodiversity is a major concern that threatens the ecological integrity of ecosystems and the ecosystem services they provide. Due to global change, an increasing proportion of river networks are drying and changes from perennial to non‐perennial flow regimes represent dramatic ecological shifts with potentially irreversible alterations of community and ecosystem dynamics. However, there is minimal understanding of how biological communities respond functionally to drying. Here, we highlight the taxonomic and functional responses of aquatic macroinvertebrate communities to flow intermittence across river networks from three continents, to test predictions from underlying trait‐based conceptual theory. We found a significant breakpoint in the relationship between taxonomic and functional richness, indicating higher functional redundancy at sites with flow intermittence higher than 28%. Multiple strands of evidence, including patterns of alpha and beta diversity and functional group membership, indicated that functional redundancy did not compensate for biodiversity loss associated with increasing intermittence, contrary to received wisdom. A specific set of functional trait modalities, including small body size, short life span and high fecundity, were selected with increasing flow intermittence. These results demonstrate the functional responses of river communities to drying and suggest that on‐going biodiversity reduction due to global change in drying river networks is threatening their functional integrity. These results indicate that such patterns might be common in these ecosystems, even where drying is considered a predictable disturbance. This highlights the need for the conservation of natural drying regimes of intermittent rivers to secure their ecological integrity.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 PMCID: PMC8554635 J. Crabot and C. P. Mundy contributed equally to this publication. JC, TD, CM and PUP worked on the conceptualization of the study. CM, JC, PUP and TD did the statistical analysis. JC, CM, TD, PUP, MG, KF, EM, MB and PW wrote the original draft. TD, EM, MG, KF, MB and PW provided resources. Author contributions
ISSN:	0906-7590 1600-0587
DOI:	10.1111/ecog.05697