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Factors Influencing Recruitment of Sydney Rock Oysters (Saccostrea Glomerata) in NSW, Australia

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posted on 2022-09-27, 23:31 authored by Juan Ramon Esquivel-Muelbert

The worldwide degradation of oyster reefs, and a growing appreciation of their considerable ecological and socio-economic worth, has prompted the development of strategies to recover their habitat. In environments with larval supply, recruitment can be a good indicator of restoration potential. We implemented a field experiment in five estuaries of New South Wales, Australia, spanning eight degrees of latitude, to determine how abiotic and biotic factors interact to influence Saccostrea glomerata recruitment. In each estuary, we deployed concrete substrate for oyster settlement at three sites of varying distance from the river mouth, each proximate to extant oyster populations. Substrate was deployed across a tidal elevation gradient spanning the mid intertidal to shallow subtidal and was caged, uncaged, or partially caged, so as to assess the importance of predation to recruitment. The number of recruits varied among estuaries along the latitudinal gradient, decreasing with increasing average temperature, dissolved oxygen concentration, and turbidity. Recruit density also varied within sites, initially increasing with tidal elevation and consistently increasing with caging. Consequently, recruitment of S. glomerata appeared limited both by environmental factors and predation. Hence, predator exclusion and habitat suitability modelling are needed to maximise the probability of successful oyster reef restoration.


Developing a framework for effective oyster reef restoration

Australian Research Council

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Table of Contents

1. Introduction -- 2. Materials and Methods -- 3. Results -- 4. Discussion -- 5. Conclusion -- References -- Supplementary Material


Submitted: 30 December 2020 as part of the requirements for completion of the degree of Master of Research

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


Thesis (MRes), Macquarie University, Faculty of Science and Engineering, Department of Biological Sciences, 2020

Department, Centre or School

Department of Biological Sciences

Year of Award


Principal Supervisor

Melanie Bishop


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New South Wales


47 pages

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