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The importance of oceanic atoll lagoons for coral reef predators

Lookup NU author(s): Christina Skinner, Dr Aileen Mill, Dr Steven Newman, Professor Nick Polunin

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2020, The Author(s). Predators on coral reefs play an important ecological role structuring reef fish communities and are important fishery targets. It is thought that reef predator assemblages increase in density and diversity from inner lagoonal to outer edge reefs. Oceanic atolls may differ though, as nutrients are available throughout. Reef predator populations are declining, but there is little known about how their distributions may vary across oceanic atolls. Using a combination of underwater visual census and baited remote underwater video, this study aimed to compare reef predator populations between inner and outer reefs of North Malé Atoll (Maldives) and determine which reef metrics may drive any differences in assemblage structure. We found that predator assemblages were significantly different between inner and outer atoll. Body sizes of several predator families were consistently larger in the outer atoll, however, abundance, biomass and species richness were similar between outer edge reefs and inner lagoonal reefs suggesting atoll lagoons may be undervalued habitats. Depth and complexity were consistently important predictors of the predator assemblage. Inner atoll lagoonal habitat is equally as important for reef predator assemblages as outer reef slopes, although the dominant species differ. This study provides important information on reef predator populations in the Maldives, where detailed assessments of the reef predator assemblage are lacking but the reef fishery is thriving and annual catch will continue to increase.


Publication metadata

Author(s): Skinner C, Mill AC, Newman SP, Alsagoff SN, Polunin NVC

Publication type: Article

Publication status: Published

Journal: Marine Biology

Year: 2020

Volume: 167

Issue: 2

Online publication date: 09/01/2020

Acceptance date: 17/12/2019

Date deposited: 20/01/2020

ISSN (print): 0025-3162

ISSN (electronic): 1432-1793

Publisher: Springer

URL: https://doi.org/10.1007/s00227-019-3634-x

DOI: 10.1007/s00227-019-3634-x


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