The importance of live coral for small-sized herbivorous reef fishes in physically challenging environments

Johansson, C. L., Bellwood, D. R., and Depczynski, M. (2012) The importance of live coral for small-sized herbivorous reef fishes in physically challenging environments. Marine and Freshwater Research, 63 (8). pp. 672-679.

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Abstract

Tropical coral reefs are facing increasing levels of disturbance, with predictions of ongoing reductions in live coral cover. The response of herbivorous fishes to loss of coral cover was investigated by analysing the relationship between the abundance of different sized herbivorous fishes and live coral cover, on a high flow reef slope and a sheltered back reef on Ningaloo Reef, Western Australia. We found positive relationships between coral cover and the abundance of small (10-20 cm) excavating and scraping parrotfishes on the slope, but a negative relationship between corals and small (10-15 cm) grazers. These relationships were not evident on back reefs. Generally, the abundance of large individuals were not correlated with live coral in either habitat. We suggest that in physically demanding environments small parrotfishes may utilise the structural complexity of corals to resist strong water flow and/or to reduce predation. Small acanthurid grazers may school to reduce energy costs and minimise predation risk. The loss of coral cover appears to be particularly important for small fishes in high energy habitats, especially non-schooling species.

Item ID: 23567
Item Type: Article (Refereed Research - C1)
Keywords: coral reefs, fish, habitat associations, herbivores, live coral, Ningaloo Reef
ISSN: 1323-1650
Date Deposited: 03 Oct 2012 05:45
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050102 Ecosystem Function @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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