Isabel Beasley

Isabel Beasley
James Cook University · College of Marine and Environmental Sciences

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33
Publications
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443
Citations

Publications

Publications (33)
Article
Full-text available
New data are reported from analyses of stomach contents from 114 long-finned pilot whales mass-stranded at four locations around Tasmania, Australia from 1992–2006. Identifiable prey remains were recovered from 84 (74%) individuals, with 30 (26%) individuals (17 females and 13 males) having empty stomachs. Prey remains comprised 966 identifiable lo...
Data
Correlation between LFPW body size and three most important cephalopod species. (PDF)
Data
Regression equations. (DOCX)
Article
Full-text available
In threatened wildlife populations, it is important to determine whether observed low genetic diversity may be due to recent anthropogenic pressure or the consequence of historic events. Historical size of the Irrawaddy dolphin (Orcaella brevirostris) population inhabiting the Mekong River is unknown and there is significant concern for long-term s...
Data
Permission to publish Fig 1 under a CC BY license. (XLSX)
Article
Full-text available
The Australian humpback dolphin, Sousa sahulensis, has recently been described to occur in northern Australian coastal waters. However, its distribution in adjacent waters of the Pacific Islands and New Guinea remains largely unknown. Although there have been few studies conducted on inshore dolphins in these regions, the available information reco...
Conference Paper
Irrawaddy dolphins Orcaella brevirostris are small cetaceans distributed in coastal, lake and riverine waters in Southeast Asia. Riverine populations include those in the Mekong River in Cambodia and southern Laos. All populations are small (< 100 individuals) and listed on the IUCN Red List as Critically Endangered. We carried out the first geneti...
Article
Full-text available
The population of Irrawaddy dolphins that occupies the Mekong River in southern Lao People's Democratic Republic and Cambodia is classified as Critically Endangered by the IUCN. Based on capture-recapture of photo-identified individuals, we estimated that the total population numbered 93 ± SE 3.90 individuals (95% CI 86–101), as of April 2007. The...
Chapter
Full-text available
Cetacean-watch tourism in developing countries remains poorly documented, and often poorly managed as a result of limited in-country capacity, ineffective governance, conflicting policy goals, and limited accountability. The dolphin-watch tourism that targets the population of Irrawaddy dolphins, Orcaella brevirostris, in the Mekong River in Cambod...
Article
Full-text available
Conservation management relies on being able to identify and describe species. Recent morphological and molecular analyses of the dolphin genus Orcaella show a species-level disjunction between eastern Australia and South-east Asia. However, because of restricted sampling, the taxonomic affinities of the geographically intermediate populations in t...
Article
Full-text available
The Irrawaddy dolphin (Orcaella brevirostris) population inhabiting the Mekong River is classified by the IUCN as Critically Endangered, with significant concerns about its future survival. Dolphin-watching tourism began in two areas along the dolphin's habitat in the early 1990s, however for both areas dolphin-watching activities were unmanaged an...
Article
Several attempts have been made to conserve the critically endangered population of Irrawaddy dolphins inhabiting the lower Mekong River. In January 2001, the Mekong Dolphin Conservation Project (MDCP) was initiated as part of the first author's PhD research at James Cook University, Australia. All activities were conducted in cooperation with the...
Article
Full-text available
The first dedicated, boat-based marine mammal surveys in Cambodian coastal waters were con-ducted over seven discrete survey periods, span-ning February to September 2001. These surveys covered the majority of Cambodian coastal waters, in addition to the main offshore islands. As a result of these surveys, ten marine mammal species have now been co...
Article
Full-text available
Comparisons of the Irrawaddy dolphin, Orcaella brevirostris, between Australian and Asian sites documented geographic differences in height of dorsal fin, presence or absence of a median dorsal groove in front of the dorsal fin, and coloration (presence or absence of a dorsal cape). Analysis of genetic data provided support for two clades within th...
Article
Full-text available
Irrawaddy dolphins Orcaella brevirostiris are found in coastal waters from the Bay of Bengal east to Palawan, Philippines and south to northern Australia. They also occur in three large tropical river systems in South-east Asia: the Mekong, Mahakam and Ayeyarwady. In March and May 1997 approximately 350 km of riverine habitat in parts of north-east...
Article
Analysis of skull morphology of Irrawaddy Dolphin Orcaella brevirostris specimens from throughout its range resulted in significant separation of specimens from Australia (including one specimen from Papua New Guinea) and those from Asian countries. Specimens from Australia were characterised by a range of nodular nasal ossicles (vs. two transverse...
Article
Irrawaddy dolphins (Orcaella brevirostris) have previously been reported to occur in Songkhla Lake, but there have been no surveys undertaken and little information has been gathered on the status of the population. Boat, aerial and interview surveys were conducted in the Lake, which revealed a low sighting rate and high levels of mortality. It app...
Article
We studied the surface and dive times of finless porpoises (Neophocaena phocaenoides) in Hong Kong from three land-based survey sites in winter/spring 2000, to allow the estimation of the trackline detection probability [g(0)] for helicopter line transect surveys in Hong Kong. We determined that groups of finless porpoises in Hong Kong spend on ave...

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