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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE (Open Access)

Marine habitat mapping of green turtle (Chelonia mydas) foraging grounds in the Northern Territory, Australia

Natalie Robson https://orcid.org/0009-0000-9955-1926 A * , Carol Palmer A , Sam Banks https://orcid.org/0000-0003-2415-0057 A , Michele Thums B , Alana Grech C , Joanna Day D E , Kakadu Rangers F , Robert Risk https://orcid.org/0009-0001-0003-4767 G , Dylan Cooper G and Garnet Hooper H
+ Author Affiliations
- Author Affiliations

A Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT, Australia.

B Australian Institute of Marine Science (AIMS), Crawley, WA, Australia.

C College of Science and Engineering, James Cook University, Townsville City, Qld, Australia.

D Taronga Institute of Science and Learning, Taronga Conservation Society Australia, Mosman, NSW, Australia.

E School of Natural Sciences, Macquarie University, North Ryde, NSW, Australia.

F Kakadu Rangers, Parks Australia, Kakadu and Cultural Heritage Branch, Department of Climate Change, Energy, the Environment and Water, Darwin, NT, Australia.

G Garig Gunak Barlu Park Rangers, NT Parks and Wildlife Commission of the Northern Territory, Darwin, NT, Australia.

H National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA), Perth, WA, Australia.

* Correspondence to: natalie.robson@cdu.edu.au

Handling Editor: Thomas Wernberg

Marine and Freshwater Research 76, MF25031 https://doi.org/10.1071/MF25031
Submitted: 12 February 2025  Accepted: 18 April 2025  Published: 3 June 2025

© 2025 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

Green turtles (Chelonia mydas) are listed as vulnerable in Australia and are culturally significant to Indigenous Traditional Owners. However, their foraging habitats remain poorly understood, particularly in northern Australia.

Aims

To map green turtle foraging habitats in the Northern Territory, through collaboration with Traditional Owners and ranger groups to support Sea Country management.

Methods

Visual classifications of towed video transect data were used in a Support Vector Machine Learning Model to predict habitat across 379 km2 of remotely sensed satellite imagery, encompassing two green turtle foraging grounds within jointly managed parks, namely, Trepang Bay (Garig Gunak Barlu Marine Park) and Field Island (Kakadu National Park).

Key results

Foraging turtle habitat; algae and seagrass made up 30% of the Trepang Bay and 18.05% of the Field Island foraging areas. The classification accuracy of the model showed a high level of agreement at both sites (0.63 and 0.75 respectively).

Conclusion

These habitats provide good foraging grounds for green turtles and support different age classes for various behaviours, including resting and predator avoidance.

Implications

The simple and repeatable field methods used in this study allow for ongoing monitoring by ranger groups. The findings will support conservation planning and management in the Northern Territory.

Keywords: collaborative, ecology, feeding, management, rangers, remote sensing, seagrass, towed-video.

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