Differential occupation of available coral hosts by coral-dwelling damselfish (Pomacentridae) on Australia's Great Barrier Reef

Chase, Tory J., and Hoogenboom, Mia O. (2019) Differential occupation of available coral hosts by coral-dwelling damselfish (Pomacentridae) on Australia's Great Barrier Reef. Diversity, 11 (11). 219.

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Associations between habitat-forming, branching scleractinian corals and damselfish have critical implications for the function and trophic dynamics of coral reef ecosystems. This study quantifies how different characteristics of reef habitat, and of coral morphology, determine whether fish occupy a coral colony. In situ surveys of aggregative damselfish-coral associations were conducted at 51 different sites distributed among 22 reefs spread along > 1700 km of the Great Barrier Reef, to quantify interaction frequency over a large spatial scale. The prevalence of fish-coral associations between five damselfish (Chromis viridis, Dascyllus aruanus, Dascyllus reticulatus, Pomacentrus amboinensis and Pomacentrus moluccensis) and five coral species (Acropora spathulata, Acropora intermedia, Pocillopora damicornis, Seriatopora hystrix, and Stylophora pistillata) averaged ~30% across all corals, but ranged from < 1% to 93% of small branching corals occupied at each site, depending on reef exposure levels and habitat. Surprisingly, coral cover was not correlated with coral occupancy, or total biomass of damselfish. Instead, the biomass of damselfish was two-fold greater on sheltered sites compared with exposed sites. Reef habitat type strongly governed these interactions with reef slope/base (25%) and shallow sand-patch habitats (38%) hosting a majority of aggregative damselfish-branching coral associations compared to reef flat (10%), crest (16%), and wall habitats (11%). Among the focal coral species, Seriatopora hystrix hosted the highest damselfish biomass (12.45 g per occupied colony) and Acropora intermedia the least (6.87 g per occupied colony). Analyses of local coral colony traits indicated that multiple factors governed colony usage, including spacing between colonies on the benthos, colony position, and colony branching patterns. Nevertheless, the morphological and habitat characteristics that determine whether or not a colony is occupied by fish varied among coral species. These findings illuminate the realized niche of one of the most important and abundant reef fish families and provide a context for understanding how fish-coral interactions influence coral population and community level processes.

Item ID: 61926
Item Type: Article (Research - C1)
ISSN: 1424-2818
Keywords: biological interactions, coral reefs, coral-fish association, Damselfish, habitat structure, symbiosis, prevalence
Copyright Information: © 2019 by the authors. This is an Open Access license distributed under the Creative Commons Attribution license.
Funders: Australian Research Council (ARC), James Cook University
Projects and Grants: ARC Centre of Excellence for Coral Reef Studies CE140100020
Research Data: http://doi.org/10.25903/5dcb4c44aa86a
Date Deposited: 05 Feb 2020 05:07
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 80%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 20%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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