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Reef fishes weaken dietary preferences after coral mortality, altering resource overlap
Author(s) -
Semmler Robert F.,
Sanders Nathan J.,
CaraDonna Paul J.,
Baird Andrew H.,
Jing Xin,
Robinson James P. W.,
Graham Nicholas A. J.,
Keith Sally A.
Publication year - 2022
Publication title -
journal of animal ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.134
H-Index - 157
eISSN - 1365-2656
pISSN - 0021-8790
DOI - 10.1111/1365-2656.13796
Subject(s) - coral , acropora , coral reef , reef , biology , foraging , ecology , anthozoa , coral reef fish , coral bleaching , resilience of coral reefs , aquaculture of coral , fishery
The direct and indirect effects of climate change can affect, and are mediated by, changes in animal behaviour. However, we often lack sufficient empirical data to assess how large‐scale disturbances affect the behaviour of individuals, which scales up to influence communities. Here, we investigate these patterns by focusing on the foraging behaviour of butterflyfishes, prominent coral‐feeding fishes on coral reefs, before and after a mass coral bleaching event in Iriomote, Japan. In response to 65% coral mortality, coral‐feeding fishes broadened their diets, showing a significant weakening of dietary preferences across species. Multiple species reduced their consumption of bleaching‐sensitive Acropora corals, while expanding their diets to consume a variety of other coral genera. This resulted in decreased dietary overlap among butterflyfishes. Behavioural changes in response to bleaching may increase resilience of coral reef fishes in the short term. However, coral mortality has reduced populations of coral‐feeders world‐wide, indicating the changes in feeding behaviour we document here may not be sufficient to ensure long‐term resilience of butterflyfishes on coral reefs.