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Cryptic invertebrates on subtidal rocky reefs vary with microhabitat structure and protection from fishing

Citation

Alexander, TJ, Cryptic invertebrates on subtidal rocky reefs vary with microhabitat structure and protection from fishing, Marine Ecology - Progress Series, 481 pp. 93-104. ISSN 0171-8630 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Inter-Research

DOI: doi:10.3354/meps10263

Abstract

ABSTRACT: The deployment of flat concrete blocks on subtidal rocky reefs can replicate natural reef microhabitats and provides a means for standardized sampling of cryptic invertebrates. The shape of the cavity beneath the block is related to reef topography and may influence the invertebrate community by affecting the amount of space for cryptic fauna to colonise and influencing the effectiveness of their predator-defence mechanisms. To determine the effect of sub-block reef structure and different levels of external predators on cryptic molluscs and echinoderms, I deployed concrete blocks at locations inside and outside the Maria Island marine reserve in eastern Tasmania, Australia. Relationships between sub-block reef structure and the cryptic invertebrate assemblage were evident between locations, whereas only a small but significant proportion of variation of assemblages between blocks within location was explained by reef surface area. No clear association with external predation pressure was evident in multivariate analyses of variation in assemblage structure. Juvenile abalone Haliotis rubra were not influenced by micro - habitat structure but were significantly less abundant at protected locations, the only species to exhibit such a response. This result follows a decline of emergent adult abalone in the marine reserve and raises the possibility of recruitment failure of abalone at some fully protected locations in the longer term.

Item Details

Item Type:Refereed Article
Keywords:Cryptic species · Marine reserve · Abalone · Boulders · Echinoderms · Molluscs
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Conservation and Biodiversity
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Alexander, TJ (Dr Timothy Alexander)
ID Code:89092
Year Published:2013
Web of Science® Times Cited:2
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-02-25
Last Modified:2014-06-02
Downloads:0

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