Toward a loss of functional diversity in stream fish assemblages under climate change

Année de publication



Global Change Biology 19 387 400 2


The assessment of climate change impacts on biodiversity has so far been biased toward the taxonomic identification of the species likely either to benefit from climate modifications or to experience overall declines. There have still been few studies intended to correlate the characteristics of species to their sensitivity to climate change, even though it is now recognized that functional trait‐based approaches are promising tools for addressing challenges related to global changes. In this study, two functional indices (originality and uniqueness) were first measured for 35 fish species occurring in French streams. They were then combined to projections of range shifts in response to climate change derived from species distribution models. We set out to investigate: (1) the relationship between the degrees of originality and uniqueness of fish species, and their projected response to future climate change; and (2) the consequences of individual responses of species for the functional diversity of fish assemblages. After accounting for phylogenetic relatedness among species, we have demonstrated that the two indices used measure two complementary facets of the position of fish species in a functional space. We have also rejected the hypothesis that the most original and/or less redundant species would necessarily experience the greatest declines in habitat suitability as a result of climate change. However, individual species range shifts could lead simultaneously both to a severe decline in the functional diversity of fish assemblages, and to an increase in the functional similarity among assemblages, supporting the hypothesis that disturbance favors communities with combination of common traits and biotic homogenization as well. Our findings therefore emphasize the importance of going beyond the simple taxonomic description of diversity to provide a better assessment of the likely future effects of environmental changes on biodiversity, thus helping to design more effective conservation and management measures.

Type de publication
  • journal
Type de document
  • article
Classification - Inist-CNRS
    Classification - Scopus
    • 1 - Physical Sciences
    • 2 - Environmental Science
    • 3 - General Environmental Science
    • 3 - Ecology
    • 3 - Environmental Chemistry
    • 3 - Global and Planetary Change
    Classification - Science Metrix
    • 1 - natural sciences
    • 2 - biology
    • 3 - ecology
    Classification - Clarivate Analytics (Subject Category)
    • 1 - science
    • 2 - environmental sciences
    • 2 - ecology
    • 2 - biodiversity conservation
    Termes extraits

    climate change; functional originality; ecology; functional diversity; phylogenetic; a1fi; taxonomic; freshwater; global change biology; biodiversity; buisson; predictor; grenouillet; functional changes; blackwell publishing; functional space; villeger; functional uniqueness; scenario; functional traits; gobio; functional indices; biotic; ecosystem; assemblage; julliard; hierarchical; thuiller; ecology letters; anguilla; buisson grenouillet; mouillot; original species; trait; assemblage level; devictor; climate change scenarios; species distribution models; biogeography; uniqueness; phylogenetic relatedness; phylogenetic signal; functional niche; uniqueness indices; species turnover; homogenization; originality; species level; future climate change; french streams; loser; olden; environmental disturbances; biological traits; other species; individual responses; future climate; range shifts; biological conservation; biotic homogenization; global changes; global; functional; toulouse; suitability; functional redundancy; functional homogenization; complementary facets; bird communities; functional structure; redundant species; functional metrics; cyprinid species; biological identity; specialist species; gelman hill; future periods; conservation biology; functional index; climate warming; nearest neighbor; species pool; global ecology; individual species; potential effects; species distribution; freshwater biology; climate disturbances; ecological; species; niche; turnover; facet; equal weight; kottelat freyhof; euclidean distance; annual rainfall; total variability; headwater source; development core team; drainage basin; phylogenetic tree; paradis claude; correlation matrix; climate change scenario; future climate conditions; surface area; hierarchical models; environmental variables; freshwater ecosystems; functional change; full model; river basin; aquatic environment; spatial position; functional facets; parsimonious model; selection procedure; originality index; ecological applications; anguilla anguilla; habitat alterations; cottus gobio; parachondrostoma toxostoma; community ecology; salmo trutta; lampetra planeri; squalius cephalus; parmesan yohe; current assemblages; average change; functional consequences; functional identity; small number; originality change; highest degree; high level; functional features; body size; better understanding; management measures; environmental changes; unique species; northern regions; phylogenetic diversity; taxonomic diversity; ongoing climate change; common traits; biotic interactions; guisan thuiller; functional similarity; global warming; severe decline; species distributions; royal society sciences; habitat suitability; species diversity; greatest declines; comparative data; species composition; hadley centre; promising tools; functional approaches; environmental change; annual review; body shape; functional ecology; climate change impacts; ecological monographs; freshwater biodiversity; change biology; freshwater fish; stream gradient

    Entité nommée
    Entité nommée - Emplacement géographique
    • Narbonne
    • Toulouse
    • France
    Entité nommée - Organisme
    • R Development Core Team
    • French National Agency for Water and Aquatic Environment
    • Blackwell Publishing Ltd
    • Climatic Research Unit Climatology
    Entité nommée - Personne
    Coordinate; Hadley Centre; Monika Ghosh
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