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Habitat and humans predict the distribution of juvenile and adult snapper (Sparidae: Chrysophrys auratus) along Australia’s most populated coastline

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Rees, MJ, Knott, NA, Hing, ML, Hammond, M, Williams, J ORCID: 0000-0002-4173-3855, Neilson, J, Swadling, DS and Jordan, A 2021 , 'Habitat and humans predict the distribution of juvenile and adult snapper (Sparidae: Chrysophrys auratus) along Australia’s most populated coastline' , Estuarine, Coastal and Shelf Science, vol. 257 , pp. 1-14 , doi: 10.1016/j.ecss.2021.107397.

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Abstract

Ecosystem-based fisheries managers are increasingly seeking quantitative and spatially-explicit information on species distributions to assist with the management of fisheries and aquatic habitats. In this study, we used boosted regression trees (BRT) to build species distribution models for a highly valued coastal teleost – pink snapper (Sparidae: Chrysophrys auratus) across rocky reefs adjacent to Australia's most urbanised coastline. BRT models for juvenile (32 cm total length) snapper were created using a suite of environmental and habitat predictors. A surrogate for multiple anthropogenic stressors, measured as surrounding human population density, was also included in the models. The BRT model for juvenile snapper performed well (cross-validated AUC = 0.78) and identified habitat features as the most important drivers of their distribution across the region. Juvenile snapper were commonly associated with small patch reefs of low relief adjacent to large estuarine water bodies. In contrast, the performance of the BRT model for adult snapper was weak (cross-validated AUC = 0.68) but identified human population density over habitat features as the strongest predictor of adult snapper distributions. Lower occurrences of adult snapper were associated with reef habitats adjacent to large metropolitan centres, suggesting anthropogenic stressors, such as water pollution, noise and fishing may be negatively impacting adult snapper in the region. Our results highlight essential habitats for snapper populations, notably the importance of large estuaries in the coastal seascape, which are nurseries for juvenile snapper. Knowledge of the demographic habitat associations and spatial distribution of snapper across this highly urbanised coastline will support ongoing management and monitoring of snapper populations and their key habitats.

Item Type: Article
Authors/Creators:Rees, MJ and Knott, NA and Hing, ML and Hammond, M and Williams, J and Neilson, J and Swadling, DS and Jordan, A
Keywords: baited remote underwater video (BRUV), ecosystem-based fisheries management, essential fish habitat, fisheries management, species distributions modelling
Journal or Publication Title: Estuarine, Coastal and Shelf Science
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 0272-7714
DOI / ID Number: 10.1016/j.ecss.2021.107397
Copyright Information:

Crown Copyright © 2021 Published by Elsevier Ltd. This is an open access article under the Creative Commons Attribution 4.0 International (CC BY 4.0) license (http://creativecommons.org/licenses/by/4.0/).

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