Mass sea turtle slaughter at Pulau Tiga, Malaysia: Genetic studies indicate poaching locations and its potential effects

Joseph, Juanita; Nishizawa, Hideaki; Alin, James M.; Othman, Razib M.; Jolis, Gavin; Isnain, Irwan; Nais, Jamili

doi:10.1016/j.gecco.2019.e00586

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…No significant difference in haplotype frequency was observed between Balambangan and Kudat Mainland foraging aggregations (exact test, p > 0.05). Moreover, the haplotype frequency of these aggregations was not significantly different from those observed in Brunei Bay aggregation (Joseph et al, 2016; Nishizawa et al, 2018), Mantanani aggregation (Jensen, Pilcher & FitzSimmons, 2016) or Pulau Tiga carcasses (Joseph et al, 2019). Based on mixed stock analysis, the estimated natal origin of these aggregations was mainly from Sarawak and Sabah Turtle Islands Park (see Appendix S1 for details).…”

Section: Resultsmentioning

confidence: 55%

“… Note : a, Joseph et al (2016); b, Nishizawa et al (2018); c, Jensen, Pilcher & FitzSimmons (2016); d, Joseph et al (2019). …”

Section: Resultsmentioning

confidence: 99%

“…3.5 (Excoffier & Lischer, 2010). The haplotype frequencies were also compared to those reported from the South China Sea, Brunei Bay aggregation (Joseph et al, 2016; Nishizawa et al, 2018), Mantanani aggregation (Jensen, Pilcher & FitzSimmons, 2016) and Pulau Tiga carcasses (Joseph et al, 2019). Since the haplotype frequency did not differ significantly between Kudat and Balambangan aggregations (see Section 3), the data were combined.…”

Section: Methodsmentioning

confidence: 99%

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Variations in body condition of green turtles (Chelonia mydas) in two nearby foraging grounds indicate their sensitivity to foraging habitats

Nishizawa,

Joseph,

Jolis

et al. 2023

Aquatic Conservation

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Coastal seagrass habitats are critical foraging grounds for endangered green turtles (Chelonia mydas). However, these habitats are vulnerable to anthropogenic effects, potentially leading to their degradation with consequent impacts on the health status of foraging green turtles. Two foraging habitats of green turtles in Tun Mustapha Park, Sabah, Malaysia were surveyed: Kudat Mainland and Balambangan Island, by capturing green turtles and evaluating their physical body condition as well as assessing seagrass cover. Despite having similar genetic compositions, the Kudat Mainland aggregation had significantly higher body size (curved carapace length: 61.7 ± 14.5 cm, body weight: 30.0 ± 22.2 kg), Fulton's body condition index (BCI: 1.49 ± 0.13), barnacle (Chelonibia testudinaria) occurrence (78.8%) and barnacle abundance (5.46 ± 9.90 barnacles/turtle) than the Balambangan Island aggregation (curved carapace length: 51.6 ± 8.1 cm, body weight: 17.3 ± 7.7 kg, BCI: 1.40 ± 0.09, barnacle occurrence: 31.0%, barnacle abundance: 0.50 ± 0.92 barnacles/turtle). The differences in BCI between the nearby aggregations could not be attributed to size and barnacle occurrence differences, suggesting the foraging habitat is the primary factor affecting the body condition of green turtles. Seagrass cover at Kudat Mainland was only slightly higher than at Balambangan Island. These findings suggest that the body condition of green turtles is potentially sensitive to the quality of foraging habitats such as nutrients and water quality. It is crucial to monitor the health of foraging habitats and their impact on the body condition of turtles. It is recommended that habitat‐turtle dynamics are given conservation priority, in parallel to water quality monitoring – with action taken to reduce pollution if necessary. A holistic approach to turtle conservation is therefore required.

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Section: Resultsmentioning

confidence: 55%

“… Note : a, Joseph et al (2016); b, Nishizawa et al (2018); c, Jensen, Pilcher & FitzSimmons (2016); d, Joseph et al (2019). …”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Variations in body condition of green turtles (Chelonia mydas) in two nearby foraging grounds indicate their sensitivity to foraging habitats

Nishizawa,

Joseph,

Jolis

et al. 2023

Aquatic Conservation

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“…Fendjalang et al, 2019) and/or (2) hold a monetary value in the illegal wildlife trade (e.g. Joseph et al, 2019) and through eco-tourism (e.g. Willard et al, 2022), a sector which is a major source of livelihood in the region (Pascoe et al, 2014;Tamayo et al, 2018).…”

Section: Taxonomic Groupsmentioning

confidence: 99%

Interactions between marine megafauna and plastic pollution in Southeast Asia

Omeyer

Duncan

Abreo

et al. 2023

Science of The Total Environment

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“…In Malaysia, consumption of turtle eggs is the main form of use, particularly in Sabah and Terengganu (Gomez and Krishnasamy, 2019;Joseph et al, 2019;Mohd Jani et al, 2020), which involves both legal and illegal trade. In most of Peninsular Malaysia, all marine turtle eggs (except leatherback turtle eggs in Terengganu and Pahang) are freely and legally traded in local markets, except in Perak and Melaka.…”

Section: Cheloniansmentioning

confidence: 99%

Widespread Use of Migratory Megafauna for Aquatic Wild Meat in the Tropics and Subtropics

Ingram

Prideaux²,

Hodgins³

et al. 2022

Front. Mar. Sci.

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Wild animals are captured or taken opportunistically, and the meat, body parts, and/or eggs are consumed for local subsistence or used for traditional purposes to some extent across most of the world, particularly in the tropics and subtropics. The consumption of aquatic animals is widespread, in some places has been sustained for millennia, and can be an important source of nutrition, income, and cultural identity to communities. Yet, economic opportunities to exploit wildlife at higher levels have led to unsustainable exploitation of some species. In the literature, there has been limited focus on the exploitation of aquatic non-fish animals for food and other purposes. Understanding the scope and potential threat of aquatic wild meat exploitation is an important first step toward appropriate inclusion on the international policy and conservation management agenda. Here, we conduct a review of the literature, and present an overview of the contemporary use of aquatic megafauna (cetaceans, sirenians, chelonians, and crocodylians) in the global tropics and subtropics, for species listed on the Appendices of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). We find that consumption of aquatic megafauna is widespread in coastal regions, although to varying degrees, and that some species are likely to be at risk from overexploitation, particularly riverine megafauna. Finally, we provide recommendations for CMS in the context of the mandate of the Aquatic Wild Meat Working Group.

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Mass sea turtle slaughter at Pulau Tiga, Malaysia: Genetic studies indicate poaching locations and its potential effects

Cited by 9 publications

References 29 publications

Variations in body condition of green turtles (Chelonia mydas) in two nearby foraging grounds indicate their sensitivity to foraging habitats

Variations in body condition of green turtles (Chelonia mydas) in two nearby foraging grounds indicate their sensitivity to foraging habitats

Interactions between marine megafauna and plastic pollution in Southeast Asia

Widespread Use of Migratory Megafauna for Aquatic Wild Meat in the Tropics and Subtropics

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