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Climate change transforms the functional identity of Mediterranean coralligenous assemblages

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Author(s)

Daniel Gómez-Gras, Cristina Linares, Maria Dornelas, Joshua S. Madin, Viviana Brambilla, Jean-Baptiste Ledoux, Paula López-Sendino, Nathaniel Bensoussan, Joaquim Garrabou

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Abstract

Quantifying changes in functional community structure driven by disturbance is critical to anticipate potential shifts in ecosystem functioning. However, how marine heatwaves (MHWs) affect the functional structure of temperate coral-dominated communities is poorly understood. Here, we used five long-term (> 10 years) records of Mediterranean coralligenous assemblages in a multi-taxa, trait-based analysis to investigate MHW-driven changes in functional structure. We show that, despite stability in functional richness (i.e. the range of species functional traits), MHW-impacted assemblages experienced long-term directional changes in functional identity (i.e. their dominant trait values). Declining traits included large sizes, long lifespans, arborescent morphologies, filter-feeding strategies or calcified skeletons. These traits, which were mostly supported by few sensitive and irreplaceable species from a single functional group (habitat-forming octocorals), disproportionally influence certain ecosystem functions (e.g. 3D-habitat provision). Hence, MHWs are leading to assemblages that are deficient in key functional traits, with likely consequences for the ecosystem functioning.
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Original languageEnglish
Number of pages14
JournalEcology Letters
VolumeEarly View
Early online date16 Mar 2021
DOIs
Publication statusE-pub ahead of print - 16 Mar 2021

    Research areas

  • Community structure, Disturbance, Functional change, Functional diversity, Functional ecology, Reefs, Stability, Temperate, Warming

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