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- Title
Coral reef degradation alters the isotopic niche of reef fishes.
- Authors
Letourneur, Yves; Briand, Marine; Graham, Nicholas
- Abstract
The degradation of coral reefs is widely reported, yet there is a poor understanding of the adaptability of reef fishes to cope with benthic change. We tested the effects of coral reef degradation on the feeding plasticity of four reef fish species. We used isotopic niche sizes and mean δN and δC values of each species in two coral reefs that differed in benthic condition. The species chosen have contrasting feeding strategies; Chaetodon lunulatus (corallivore), Chrysiptera rollandi (zooplanktivore), Halichoeres melanurus (invertivore) and Zebrasoma velifer (herbivore). We predicted that the corallivore would have a lower mean δN value and a smaller isotopic niche size in the degraded reef, that the herbivore and the invertivore might have a larger isotopic niche size and/or a different mean δC value, whereas the zooplanktivore might be indifferent since the species is not linked to coral degradation. Some results matched our predictions; C. lunulatus had a smaller niche size on the degraded reef, but no difference in mean δN and δC values, and H. melanurus displayed an increase in niche size and a lower mean δN value on the degraded reef. Some other results were contrary to our predictions; whereas Z. velifer and C. rollandi had smaller mean δC values but no difference in niche size. Our findings suggest there may be feeding plasticity to maintain a similar diet despite contrasting habitat characteristics, with different amplitude depending on species. Such findings suggest that certain species guilds would probably adapt to changes linked to habitat degradation.
- Subjects
CORAL reefs &; islands; REEF fishes; BENTHIC ecology; CHAETODON; HALICHOERES
- Publication
Marine Biology, 2017, Vol 164, Issue 12, p1
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-017-3272-0