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Advances in the aquatic sciences
RESEARCH ARTICLE (Open Access)

Environmental factors and predator abundance predict the distribution and occurrence of two sympatric urchin species at Ningaloo Reef, Western Australia

Emma L. Westlake https://orcid.org/0000-0001-8439-2643 A D , Cindy Bessey A B , Rebecca Fisher B C , Damian P. Thomson A and Michael D. E. Haywood A
+ Author Affiliations
- Author Affiliations

A Commonwealth Scientific and Industrial Research Organisation, Oceans and Atmosphere, 35 Stirling Highway, Crawley, WA 6009, Australia.

B University of Western Australia, School of Plant Biology and the Oceans Institute, 35 Stirling Highway, Crawley, WA 6009, Australia.

C Australian Institute of Marine Science, 35 Stirling Highway, Crawley, WA 6009, Australia.

D Corresponding author. Email: emma.westlake@csiro.au

Marine and Freshwater Research 72(12) 1711-1721 https://doi.org/10.1071/MF21091
Submitted: 24 March 2021  Accepted: 13 July 2021   Published: 23 August 2021

Journal Compilation © CSIRO 2021 Open Access CC BY

Abstract

Sea urchins can play a critical ecological role in the functioning of marine benthic ecosystems, mediating competitive interactions between corals and algae. Yet, little is known about factors affecting urchin distribution in intact coral reef systems. This study aims to determine the spatial distribution of two sympatric urchin species, Echinometra mathaei and Echinostrephus molaris, and potential factors contributing to this, within the intact coral reef system of Ningaloo Marine Park, north-western Western Australia. Benthic photographs and surveys were conducted on SCUBA at 126 sites across the Park to determine urchin presence, rugosity, substrate cover, water velocity, and fish predation for each site. Generalised additive models found that E. mathaei presence was positively related to algal cover, rugosity and non-sanctuary zones, suggesting that distribution may be driven by foraging behaviour, habitat complexity and predation. Echinostrephus molaris presence was positively related to habitat and region, suggesting its distribution may be largely driven by hydrodynamics, feeding strategy and regional variation. This study highlighted species-habitat associations and the complexities of these in structuring urchin communities. Although occupying similar niches, the predominantly non-overlapping feeding preferences, and morphological and behavioural differences between E. mathaei and E. molaris enable these species to coexist within the intact reef system of Ningaloo Marine Park.

Keywords: sea urchins, distribution, Echinometra mathaei, Echinostrephus molaris, predation, management zones.


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