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Conserving Thailand’s cetaceans

A herd of Irrawaddy dolphins in the eastern Gulf of Thailand. (Photo: Somchai Mananunsap)

This is the second of four stories about new Australian Marine Mammal Centre research projects...

The first detailed study of cetaceans in Trat Province, along the eastern coast of the Gulf of Thailand, will provide critical information on their abundance, distribution, and management and conservation needs.

Project leader, Associate Professor Ellen Hines of the San Francisco State University in the United States, says Southeast Asia is a priority region for studies on cetacean conservation and artisanal (small-scale) fisheries, due to the lack of data on cetacean populations and high by-catch rates in the fisheries.

Among the species of interest are the Irrawaddy dolphin (Orcaella brevirostris), the Indo-Pacific humpback dolphin (Sousa chinensis) and the finless porpoise (Neophocaena phocaenoides).

‘Our project will be the first in this area to gather data on these vulnerable and near-threatened species, which will be crucial for their management,’ Professor Hines says.

‘The eastern Gulf coast, particularly Chang Island in Trat province, has few protected areas and is becoming increasingly popular with tourists and gradually overfished.’

A local fishing village in the eastern Gulf of Thailand. Photo: Ellen Hines

Professor Hines and her team will work closely with federal, provincial and local government departments, scientists, fishermen, villagers and students, to collect and disseminate information that will contribute to local management plans and the International Union for the Conservation of Nature’s (IUCN) Conservation Action Plan for the World’s Cetaceans. The collaboration will build on the team’s already strong links with the community, established during eight years of research in the region.

The study will involve boat-based surveys, photo identification, spatial habitat modelling, beach surveys, and interviews with villagers about their cultural and traditional knowledge and conservation values.

‘We will use boat-based surveys to investigate the spatial distribution and abundance of coastal cetaceans, to study patterns of habitat use and how this influences their potential interactions with fisheries, and to study cetacean behaviour, group dynamics and movement patterns,’ Professor Hines says.

The photo-identification work will identify individual animals through fin markings, enabling the team to estimate home ranges and movement in and out of areas. Geographic Information Systems and statistical modelling will be used to study the relationship between where cetaceans are observed and environmental variables such as salinity, water temperature, depth, and the presence of nets and fishing vessels. Beach surveys will look for cetacean remains that can provide tissue samples for genetic and physical analysis.

Professor Hines’ research team will use this local vessel to undertake the work. Photo: Ellen Hines

Interviews with community members will determine the numbers of fishermen involved in different fishing practices and their catch species. The interviews will also address the history and possible cultural relationship between cetaceans and coastal villagers, stranding locations and numbers, patterns of movement and sightings, and threatening fishing practices.

‘Conservation must address the needs and values of local human populations. Studying various dimensions of the human socioeconomic system, and how that influences human use of the environment can shed light on options for cetacean conservation and management,’ Professor Hines says.

In addition to formal conservation measures, the research results will be used to produce educational materials for school and village outreach programs that address basic cetacean ecology and marine conservation issues.

WENDY PYPER

Corporate Communications, Australian Antarctic Division

Next story: Dolphins under threat

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