A rare contemporary record of the Critically Endangered Ganges shark <i>Glyphis gangeticus</i>

Jabado, Rima W.; Kyne, Peter M.; Nazareth, Evan; Sutaria, Dipani

doi:10.1111/jfb.13619

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…Therefore, this publication is the first verified report of a G. gangeticus specimen from Ban gladesh within its home range in over a decade. There was only one previous recent record from the Arabian Sea (Jabado et al 2018). This indicates the importance of studying this elusive species more comprehensively within its range.…”

Section: The Existing G Gangeticus Population In Bangladeshi Watersmentioning

confidence: 99%

“…Even in the very recent surveys conducted in India, no specimen was recorded until 2017 (Kizhakudan et al 2015). This lack of records is indicative of either local extirpation in some of its historical range (Jabado et al 2018), poor identification capacities (Akhilesh et al 2014), or small population size. This indicates a data gap in information needed for effective conservation measures.…”

Section: Conservation Implications Of This Studymentioning

confidence: 99%

“…As this species uses rivers and coastal areas for nursery grounds and individuals have been recorded from Sundarbans previously (Martin 2005, Roberts 2006, Pillans et al 2010, White et al 2015, Feutry et al 2014, there is a need for transboundary efforts with a special emphasis on Sundarbans. Moreover, G. gangeticus is susceptible to the effects of intensification of anthropogenic modification, habitat degradation, and overexploitation (Jabado et al 2018). Imperilment of the Sundarbans (Islam & Wahab 2005) has a serious potential impact in restricting the critical habitat for Glyphis spp.…”

Section: Conservation Implications Of This Studymentioning

confidence: 99%

“…This undescribed species, overlapping in its distribution with G. gangeticus (Amaral et al 2017), is only known to be found in the Gangetic delta (Pal et al 2014). Within the western Indo-Pacific, the Ganges shark (G. gangeticus) has a widespread but patchy distribution (Jabado et al 2018) (Table 1). Identification is based primarily on the jaws because whole individuals have rarely been found and examined.…”

Section: Introductionmentioning

confidence: 99%

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New records of the Critically Endangered Ganges shark Glyphis gangeticus in Bangladeshi waters: urgent monitoring needed

Haque¹,

Das²

2019

Endang. Species. Res.

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The different species of elasmobranch found in Bangladeshi fisheries and markets were quantified in a survey between February 2016 and November 2017. This resulted in records of the Critically Endangered Ganges shark Glyphis gangeticus (Müller & Henle, 1839) in the waters of Bangladesh. Three records from the landing sites and shark processing centres of Cox's Bazar in southeast Bangladesh were identified and confirmed as G. gangeticus by sequencing the expression of the cytochrome c oxidase subunit I (COI) gene and by the morphological identification of 1 individual. These represent the most recent records of this species in Bangladesh in over a decade, and only the second set of records from anywhere within the range of this elusive shark. Capture dates and traders' knowledge of these catches suggest a year-round distribution, indicating a population within the Bay of Bengal and adjacent coastal rivers. Although the species is protected under Bangladeshi law, enforcement of the law is inadequate. Monitoring for this, and other, rare and threatened species at landing sites, rigorous surveys to locate any existing populations, trade regulation, and enforcement of conservation legislation should be considered priorities for effective conservation.

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Section: The Existing G Gangeticus Population In Bangladeshi Watersmentioning

confidence: 99%

Section: Conservation Implications Of This Studymentioning

confidence: 99%

Section: Conservation Implications Of This Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New records of the Critically Endangered Ganges shark Glyphis gangeticus in Bangladeshi waters: urgent monitoring needed

Haque¹,

Das²

2019

Endang. Species. Res.

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“…are highly threatened euryhaline sharks of the Indo‐West Pacific, characterised by taxonomic uncertainty, poorly‐defined distributions, and a lack of ecological data (Li et al., 2015). One species, the Ganges Shark ( Glyphis gangeticus ) faces immense human pressure in Southeast Asia and the Arabian Sea, with only rare contemporary records (Jabado, Kyne, Nazareth, & Sutaria, 2018; Li et al., 2015). In contrast, two species, the Speartooth Shark ( Glyphis glyphis ) and the Northern River Shark ( Glyphis garricki ), occur in relatively undisturbed environments of northern Australia where low human population size and the remoteness of the landscape have limited development pressure, and many estuaries are in near‐pristine conditions (Pillans, Stevens, Kyne, & Salini, 2010; Woinarski, Mackey, Nix, & Traill, 2007).…”

Section: Introductionmentioning

confidence: 99%

One panel to rule them all: DArTcap genotyping for population structure, historical demography, and kinship analyses, and its application to a threatened shark

Feutry

Devloo‐Delva

et al. 2020

Molecular Ecology Resources

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With recent advances in sequencing technology, genomic data are changing how important conservation management decisions are made. Applications such as Close-Kin Mark-Recapture demand large amounts of data to estimate population size and structure, and their full potential can only be realised through ongoing improvements in genotyping strategies. Here we introduce DArTcap, a cost-efficient method that combines DArTseq and sequence capture, and illustrate its use in a high resolution population analysis of Glyphis garricki, a rare, poorly known and threatened euryhaline shark. Clustering analyses and spatial distribution of kin pairs from four different regions across northern Australia and one in Papua New Guinea, representing its entire known range, revealed that each region hosts at least one distinct population. Further structuring is likely within Van Diemen Gulf, the region that included the most rivers sampled, suggesting additional population structuring would be found if other rivers were sampled. Coalescent analyses and spatially explicit modelling suggest that G. garricki experienced a recent range expansion during the opening of the Gulf of Carpentaria following the conclusion of the Last Glacial Maximum. The low migration rates between neighbouring populations of a species that is found only in restricted coastal and riverine habitats show the importance of managing each population separately, including careful monitoring of local and remote anthropogenic activities that may affect their environments. Overall we demonstrated how a carefully chosen SNP panel combined with DArTcap can provide highly accurate kinship inference and also support population structure and historical demography analyses, therefore maximising cost-effectiveness.

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Conservation of Estuarine Fishes

Cowley¹,

Tweedley²,

Whitfield³

2022

Fish and Fisheries in Estuaries

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A rare contemporary record of the Critically Endangered Ganges shark Glyphis gangeticus

Cited by 7 publications

References 11 publications

New records of the Critically Endangered Ganges shark Glyphis gangeticus in Bangladeshi waters: urgent monitoring needed

New records of the Critically Endangered Ganges shark Glyphis gangeticus in Bangladeshi waters: urgent monitoring needed

One panel to rule them all: DArTcap genotyping for population structure, historical demography, and kinship analyses, and its application to a threatened shark

Conservation of Estuarine Fishes

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