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Taking a deeper look: quantifying the differences in fish assemblages between shallow and mesophotic temperate rocky reefs

Citation

Williams, J and Jordan, A and Harasti, D and Davies, P and Ingleton, T, Taking a deeper look: quantifying the differences in fish assemblages between shallow and mesophotic temperate rocky reefs, PLoS ONE, 14, (3) Article e0206778.. ISSN 1553-7366 (2019) [Refereed Article]


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DOI: doi:10.1371/journal.pone.0206778

Abstract

The spatial distribution of a species assemblage is often determined by habitat and climate. In the marine environment, depth can become an important factor as declining light and water temperature leads to changes in the biological habitat structure. To date, much of the focus of ecological fish research has been based on reefs in less than 40 m with little research on the ecological role of mesophotic reefs. We deployed baited remote underwater stereo video systems (stereo-BRUVS) on temperate reefs in two depth categories: shallow (2040 m) and mesophotic (80120 m), off Port Stephens, Australia. Sites were selected using data collected by swath acoustic sounder to ensure stereo-BRUVS were deployed on reef. The sounder also provided rugosity, slope and relief data for each stereo-BRUVS deployment. Multivariate analysis indicates that there are significant differences in the fish assemblages between shallow and mesophotic reefs, primarily driven by Ophthalmolepis lineolatus and Notolabrus gymnogenis only occurring on shallow reefs and schooling species of fish that were unique to each depth category: Atypichthys strigatus on shallow reefs and Centroberyx affinis on mesophotic reefs. While shallow reefs had a greater species richness and abundance of fish when compared to mesophotic reefs, mesophotic reefs hosted the same species richness of fishery-targeted species. Chrysophrys auratus and Nemodactylus douglassii are two highly targeted species in this region. While C. auratus was numerically more abundant on shallow reefs, mesophotic reefs provide habitat for larger fish. In comparison, N. douglassii were evenly distributed across all sites sampled. Generalized linear models revealed that depth and habitat type provided the most parsimonious model for predicting the distribution of C. auratus, while habitat type alone best predicted the distribution of N. douglassii. These results demonstrate the importance of mesophotic reefs to fishery-targeted species and therefore have implications for informing the management of these fishery resources on shelf rocky reefs.

Item Details

Item Type:Refereed Article
Keywords:species distribution, marine park, biodiversity, fish, benthic mapping, mapping, BRUV, MBES
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population ecology
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Williams, J (Dr Joel Williams)
ID Code:146337
Year Published:2019
Web of Science® Times Cited:6
Deposited By:Ecology and Biodiversity
Deposited On:2021-08-31
Last Modified:2021-09-01
Downloads:0

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