No effects of abiotic and anthropogenic factors on reef-associated neonate shark abundance within a shark nursery-area system

I. A. Bouyoucos; C. A. Simpfendorfer; G. D. Schwieterman; K. B. Eustache; Lauric Thiault; S. Planes; J. L. Rummer

doi:10.1071/MF24080

RESEARCH ARTICLE (Open Access)

Previous Next Contents Vol 75(14)

No effects of abiotic and anthropogenic factors on reef-associated neonate shark abundance within a shark nursery-area system

I. A. Bouyoucos

^A ^B ^H ^* , C. A. Simpfendorfer ^C ^D , G. D. Schwieterman ^E , K. B. Eustache ^B ^F , Lauric Thiault ^B ^G , S. Planes ^B ^G and J. L. Rummer ^A ^D

+ Author Affiliations

- Author Affiliations

^A Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Qld 4811, Australia.

^B Paris Sciences et Lettres University, École Pratique des Hautes Études (EPHE)–Université de Perpignan Via Domitia (UPVD)–Centre National de la Recherche Scientifique (CNRS), Unité de Service et de Recherche (USR) 3278 Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE), Université de Perpignan, F-66860 Perpignan, France.

^C Centre for Sustainable Tropical Fisheries and Aquaculture, James Cook University, Townsville, Qld 4811, Australia.

^D College of Science and Engineering, James Cook University, Townsville, Qld 4811, Australia.

^E School of Marine Sciences, University of Maine, Orono, ME 04469, USA.

^F Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands.

^G Laboratoire d’Excellence ‘CORAIL’, EPHE, Paris Sciences et Lettres University, UPVD, CNRS, USR 3278 CRIOBE, Papetoai, Moorea 98729, French Polynesia.

^H Present address: Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.

^* Correspondence to: ian.bouyoucos@zoology.ubc.ca

Handling Editor: Bradley Wetherbee

Marine and Freshwater Research 75, MF24080 https://doi.org/10.1071/MF24080

Submitted: 28 March 2024 Accepted: 15 August 2024 Published: 20 September 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Coastal habitats function as shark nursery areas; however, coastal habitats can experience extreme variation in abiotic conditions and are susceptible to human disturbances.

Aims

Drivers of abundance were tested within a shark nursery-area system in two populations of reef-associated neonate sharks, namely, blacktip reef sharks (Carcharhinus melanopterus) and sicklefin lemon sharks (Negaprion acutidens).

Methods

Catch data from a fisheries-independent gill-net survey (n = 90 sets from October 2018 to March 2019) at 10 sites around Moorea, French Polynesia, were used to test for associations between shark abundance and abiotic conditions (temperature, oxygen, pH, salinity, lunar phase and depth). Historical levels of fin-fish fishing effort, trampling (i.e. human movement through habitat), and coastal artificialisation (i.e. walls and embankments) estimated for each site were used to test for anthropogenic effects on shark abundance.

Key results

There were no effects of any abiotic or anthropogenic factor on abundance of either species.

Conclusions

Previous work corroborates our findings by demonstrating neonate sharks’ physiological tolerance to extreme abiotic conditions and high survival in response to anthropogenic stressors. Alternatively, populations are already degraded from decades of coastal development.

Implications

These data can aid in predicting the use of coastal habitats as shark nursery areas.

Keywords: blacktip reef shark, catch-per-unit-effort, coastal development, fishing pressure, human disturbance, sicklefin lemon shark, temperature, young-of-the-year.

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