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Diversity 2019, 11(1), 14; https://doi.org/10.3390/d11010014

Diversity and Structure of Parrotfish Assemblages across the Northern Great Barrier Reef

1
Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, HI 96744, USA
2
Applied Research Laboratory, University of Hawaii, Honolulu, HI 96822, USA
3
The Australian Institute of Marine Science, Crawley, WA 6008, Australia
4
Wildlife Marine, Perth, WA 6020, Australia
5
Marine Science Program, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Kensington, WA 6151, Australia
6
School of Molecular and Life Sciences, Curtin University, Perth, WA 6102, Australia
7
School of Life Sciences, University of Technology Sydney, Sydney, NSW 2007, Australia
8
College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
*
Author to whom correspondence should be addressed.
Received: 29 December 2018 / Revised: 16 January 2019 / Accepted: 17 January 2019 / Published: 18 January 2019
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Abstract

The structure and dynamics of coral reef environments vary across a range of spatial scales, with patterns of associated faunal assemblages often reflecting this variability. However, delineating drivers of biological variability in such complex environments has proved challenging. Here, we investigated the assemblage structure and diversity of parrotfishes—a common and ecologically important group—across 6° of latitude on the Northern Great Barrier Reef (GBR), Australia. Parrotfish abundance and biomass were determined from stereo-video surveys across 82 sites spanning 31 reefs and assessed against geographic, biophysical, and management-related factors in a multivariate framework to determine major drivers and associated scales of assemblage structure. Large cross-shelf variation in parrotfish assemblages pervaded along the entire Northern GBR, with distinct assemblages associated with sheltered and exposed reefs. Species abundances and diversity generally decreased with decreasing latitude. The gradient of explicit predator biomass associated with management zoning had no effect on parrotfish assemblage structure, but was positively correlated with parrotfish diversity. Our results highlight the ubiquitous presence of cross-shelf variation, where the greatest differences in parrotfish community composition existed between sheltered (inner and mid shelf) and exposed (outer shelf) reef systems. Prior attempts to explain linkages between parrotfishes and fine-scale biophysical factors have demonstrated parrotfishes as habitat generalists, but recent developments in nutritional ecology suggest that their cross-shelf variation on the GBR is likely reflective of benthic resource distribution and species-specific feeding modes. View Full-Text
Keywords: scarinae; Great Barrier Reef; phylogenetic diversity; habitat associations; multivariate; spatial scale; coral reef fishes; cross-shelf gradient scarinae; Great Barrier Reef; phylogenetic diversity; habitat associations; multivariate; spatial scale; coral reef fishes; cross-shelf gradient
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Johnson, G.B.; Taylor, B.M.; Robbins, W.D.; Franklin, E.C.; Toonen, R.; Bowen, B.; Choat, J.H. Diversity and Structure of Parrotfish Assemblages across the Northern Great Barrier Reef. Diversity 2019, 11, 14.

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