Synchronous behavioural shifts in reef fishes linked to mass coral bleaching

Keith, Sal and Baird, Andrew H. and Hobbs, Jean-Paul A. and Woolsey, Erika and Hoey, Andrew S. and Fadli, N. and Sanders, Nathan J. (2018) Synchronous behavioural shifts in reef fishes linked to mass coral bleaching. Nature Climate Change. ISSN 1758-678X

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Abstract

Mass coral bleaching causes population declines and mortality of coral reef species1 yet its impacts on behaviour are largely unknown. Here, we unite behavioural theory with community ecology to test whether bleaching-induced mass mortality of corals can cause consistent changes in the behaviour of coral-feeding fishes. We documented 5,259 encounters between individuals of 38 Chaetodon (butterflyfish) species on 17 reefs within the central Indo-Pacific, of which 3,828 were repeated on 10 reefs both before and after the global coral bleaching event in 2016. Aggression between butterflyfishes decreased by two-thirds following large-scale coral mortality, despite no significant change in fish abundance or community composition. Pairwise encounters were most likely to be aggressive between obligate corallivores and on reefs with high coral cover. After bleaching, the proportion of preferred Acropora corals in the diet decreased significantly (up to 85% fewer bites), with no increase in overall bite rate to compensate for the loss of these nutritionally rich corals. The observed reduced aggression at low resource levels due to nutritional deficit follows the predictions of the economic theory of aggressive behaviour2,3. Our results reveal synchronous changes in behaviour in response to coral mortality. Such changes could potentially disrupt territories4, leading to reorganization of ecological communities.

Item Type:
Journal Article
Journal or Publication Title:
Nature Climate Change
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3300/3301
Subjects:
ID Code:
128616
Deposited By:
Deposited On:
29 Oct 2018 10:30
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Jul 2020 06:47