Rare occurrences of Dasyatis bennettii (Chondrichthyes: Dasyatidae) in freshwaters of Southern China

Zhang, J.; Yamaguchi, Atsuko; Zhou, Qihai; Zhang, Chao

doi:10.1111/j.1439-0426.2010.01525.x

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In contrast to teleost fishes, 40% of which live in freshwater, only very few (about 5%) of elasmobranch species are able to survive in freshwater (28). Most of these belong to the potamotrygonid stingray family, which is fully adapted to freshwater and no longer capable of surviving in saltwater, as well as a few additional species of rays, some of which are capable of surviving in both freshwater and saltwater (29). Among sharks, only the members of the genus Glyphis and the bull shark (Carcharhinus leucas) are capable of transitioning between saltwater and freshwater environments (30).…”

Section: Discussionmentioning

confidence: 99%

DNA capture reveals transoceanic gene flow in endangered river sharks

Corrigan

Yang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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For over a hundred years, the "river sharks" of the genus Glyphis were only known from the type specimens of species that had been collected in the 19th century. They were widely considered extinct until populations of Glyphis-like sharks were rediscovered in remote regions of Borneo and Northern Australia at the end of the 20th century. However, the genetic affinities between the newly discovered Glyphis-like populations and the poorly preserved, original museum-type specimens have never been established. Here, we present the first (to our knowledge) fully resolved, complete phylogeny of Glyphis that includes both archival-type specimens and modern material. We used a sensitive DNA hybridization capture method to obtain complete mitochondrial genomes from all of our samples and show that three of the five described river shark species are probably conspecific and widely distributed in Southeast Asia. Furthermore we show that there has been recent gene flow between locations that are separated by large oceanic expanses. Our data strongly suggest marine dispersal in these species, overturning the widely held notion that river sharks are restricted to freshwater. It seems that species in the genus Glyphis are euryhaline with an ecology similar to the bull shark, in which adult individuals live in the ocean while the young grow up in river habitats with reduced predation pressure. Finally, we discovered a previously unidentified species within the genus Glyphis that is deeply divergent from all other lineages, underscoring the current lack of knowledge about the biodiversity and ecology of these mysterious sharks.freshwater sharks | DNA | museum specimens

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Section: Discussionmentioning

confidence: 99%

DNA capture reveals transoceanic gene flow in endangered river sharks

Corrigan

Yang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…The presently reported H. bennettii material from the Indian coast had a slightly shorter tail (post-cloacal tail) (2.1 times DW), than mentioned as character for species by Last et al (2016a) as 2.3-2.6 times DW and that by Nishida and Nakaya (1990) and Garman (1913) as >3 times DW. However, it may be noted that Müller and Henle (1841) in the original description had mentioned about shorter tails and Jordan and Richardson (1909) reported similar variable tail length for H. bennettii from Formosa and Zhang et al (2010) from China reported tail lengths being 1.6-2.6 times DW. So, identification purely based on tail length may be unreliable for Hemitrygon due to its high degree of variability across regions.…”

Section: Remarks and Discussionmentioning

confidence: 90%

A new report confirming the presence of Bennett’s stingray, Hemitrygon bennettii (Elasmobranchii: Myliobatiformes: Dasyatidae), from the western Bay of Bengal

Muktha¹,

Akhilesh²,

Sukumaran³

et al. 2019

Acta Ichthyol. Piscat.

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The occurrence of Bennett's stingray, Hemitrygon bennettii (Müller et Henle, 1841), is confirmed from Indian waters, based on a single male specimen (370 mm DW) collected from Visakhapatnam, western Bay of Bengal on 28 January 2017. Existing, updated reports on the distribution of the species, places it in the Indo-Pacific region with the western limit being the Strait of Malacca. With the presently confirmed occurrence from the western Bay of Bengal, the known distribution of the species extends further westwards to the Indian east coast, although it is likely to be a rare species in Indian waters.

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“…Zearaja maugeana is restricted to one population in Macquarie Harbour, Tasmania, Australia, and has likely undergone a recent bottleneck or founder event (Treloar et al 2017;Weltz et al 2018). The freshwater population of H. bennettii in Zuojiang River, China, is isolated from coastal waters by dams, and although breeding is occurring the isolated population is declining (Zhang et al 2010). A thorough understanding of gene flow, dispersal, and any barriers to dispersal is critically important to assess the global conservation status of a species and manage its conservation (Phillips et al 2021;Devloo-Delva et al 2023).…”

Section: Population Structurementioning

confidence: 99%

A review of the life history and ecology of euryhaline and estuarine sharks and rays

Constance,

Garcia,

Pillans

et al. 2023

Rev Fish Biol Fisheries

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One-third of all elasmobranchs (sharks and rays) are threatened with extinction. Euryhaline and estuarine generalist elasmobranchs are a group of 29 species that occupy non-marine environments during particular life-stages. These species are poorly known and disproportionately threatened, with 72.4% at risk of extinction or Data Deficient. A detailed knowledge of a species’ life history characteristics, movement ecology, habitat use, and population structure are required for the implementation of appropriate management and conservation measures. To date, research on euryhaline and estuarine species has lagged behind marine species. Here, a literature review and gap analysis of the euryhaline and estuarine species was conducted to identify gaps in 14 key parameters required for management. Of the 29 species, only the Bull Shark (Carcharhinus leucas) and the Largetooth Sawfish (Pristis pristis) had detailed information on a majority of parameters assessed. Nine species lack information on most parameters, while the Broadnose Wedgefish (Rhynchobatus springeri) lacks information on all but one of the parameters investigated. There is a high level of understanding of age- and size-at-maturity, size-at-birth, and growth for only five species, while nine species have estimates of natural mortality. Comprehensive reproductive biology data is unavailable for six species. Both short- and long-term movement ecology is well-understood for only two species, and habitat use for six species. Population structure has been studied in only eight species. Data on key life history parameters, population structure, and habitat requirements of the euryhaline and estuarine elasmobranchs are urgently required to develop appropriate management strategies and to secure populations.

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Rare occurrences of Dasyatis bennettii (Chondrichthyes: Dasyatidae) in freshwaters of Southern China

Cited by 5 publications

References 3 publications

DNA capture reveals transoceanic gene flow in endangered river sharks

DNA capture reveals transoceanic gene flow in endangered river sharks

A new report confirming the presence of Bennett’s stingray, Hemitrygon bennettii (Elasmobranchii: Myliobatiformes: Dasyatidae), from the western Bay of Bengal

A review of the life history and ecology of euryhaline and estuarine sharks and rays

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