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Environmental DNA Sampling from Whale-Watching Vessels for Cetacean Monitoring

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Rapid assessment of risks to a mobile marine mammal in an ecosystem-scale marine protected area.

A Grech¹, H Marsh

¹School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia. alana.grech@jcu.edu.au

Conservation Biology : the Journal of the Society for Conservation Biology

|April 16, 2008

Summary

Marine protected areas (MPAs) help conserve dugongs (Dugong dugon) in the Great Barrier Reef. Most high-value dugong habitats face low risk from human activities, but targeted management is needed in specific areas.

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Published on: January 11, 2015

Area of Science:

Marine conservation
Ecosystem management
Wildlife risk assessment

Background:

Marine protected areas (MPAs) are crucial for conservation but assessing their effectiveness for mobile species like dugongs (Dugong dugon) is challenging.
The Great Barrier Reef World Heritage Area (GBRWHA) hosts dugong populations in shallow, inshore waters within an MPA network.

Purpose of the Study:

To develop a rapid risk assessment approach for dugongs in the GBRWHA.
To identify and rank human activities posing risks to dugongs and their seagrass habitats.
To evaluate management options for mitigating identified risks.

Main Methods:

Utilized expert opinion and a Delphi technique to identify and rank five key human factors: netting, indigenous hunting, trawling, vessel traffic, and terrestrial runoff.
Developed a spatially explicit model of dugong distribution.
Quantified and compared the spatial overlap between human risk factors and dugong distribution.

Main Results:

Approximately 96% of high-value dugong habitat in the GBRWHA was estimated to be at low risk from human activities.
Sensitivity analysis indicated that reducing commercial netting or indigenous hunting in remote areas is crucial.
Reducing vessel traffic, terrestrial runoff, and commercial netting in urban areas is also necessary for risk mitigation.

Conclusions:

The rapid risk assessment approach effectively identified key threats to dugongs and their habitats within the GBRWHA MPA network.
Management efforts should prioritize reducing specific human impacts in both remote and urban areas to enhance dugong conservation.
This framework allows for comparative risk assessment and targeted management interventions for vulnerable marine species.