scholarly journals Genetic connectivity of the scalloped hammerhead shark Sphyrna lewini across Indonesia and the Western Indian Ocean

PLoS ONE ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. e0230763
Author(s):  
Sutanto Hadi ◽  
Noviar Andayani ◽  
Efin Muttaqin ◽  
Benaya M. Simeon ◽  
Muhammad Ichsan ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Genetic Connectivity ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead

scholarly journals Genetic connectivity and diversity of endangered species the scalloped hammerhead shark Sphyrna lewini (Griffith & Smith 1834) population in Indonesia and Western Indian Ocean

2020 ◽  
Author(s):  
Sutanto Hadi ◽  
Noviar Andayani ◽  
Effin Muttaqin ◽  
Benaya M Simeon ◽  
Muhammad Ichsan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Indian Ocean ◽  
Endangered Species ◽  
Western Indian Ocean ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Indonesian Population ◽  
West Papua

AbstractThe scalloped hammerhead shark Sphyrna lewini is an endangered species which expected to population declined worldwide including in Indonesia due to overexploited. However, there is a lack of information regarding recent population structure to promote proper management and conservation status in Indonesia. This study aimed to investigate the genetic diversity, population structure and connectivity of S. lewini population in Indonesia from three major sharks landing sites in Aceh (n= 41), Balikpapan (n= 30), Lombok (n= 29), and additional sequences retrieved from West Papua (n= 14) and Western Indian Ocean population (n= 65). Analyses of mitochondrial CO1 gene successfully identified a total of 179 sequences of S. lewini with an average 594 bp nucleotide with 40 polymorphic loci in 4 haplotypes for Indonesian population and 8 haplotypes for Western Indian Ocean. The overall values of genetic diversity in Indonesia was high (Hd= 0.7171; π= 0.0126), with the highest was in Aceh (Hd= 0.6683; π= 0.0198), and the lowest was in Papua (Hd= 0.1429; π= 0.0005), while in Western Indian Ocean the overall value was fairly low (Hd= 0.2322; π= 0.0010). The AMOVA and FST revealed three significant population subdivisions in Indonesia (FST= 0.4415; p < 0.001) with separated population for Aceh and West Papua, and a mixing population between Balikpapan and Lombok (FST= 0.044; p = 0.089), whereas relatively no significant differentiation within population in Western Indian Ocean (FST= −0.0131; p = 0.6011), and significant different level showed by Indonesian population compared with Western Indian Ocean population (FST= 0.7403; p < 0.001). The construction of haplotype network exhibited evidence of gene flow and haplotype sharing between populations. This result indicated a complex and limited connectivity population of S. lewini in Indonesia, and between Western Indian Ocean in regional scale which need co-management action across region.

scholarly journals Deep-water observation of scalloped hammerhead Sphyrna lewini in the western Indian Ocean off Tanzania

2015 ◽  
Vol 8 ◽  
Author(s):  
Alec B.M. Moore ◽  
Andrew R. Gates
Keyword(s):  
Indian Ocean ◽  
Deep Water ◽  
Western Indian Ocean ◽  
Hydrocarbon Exploration ◽  
Remotely Operated Vehicle ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
The Indian Ocean ◽  
Common Behaviour

A scalloped hammerheadSphyrna lewiniwas observed opportunistically from a remotely operated vehicle 1 m off the seabed at 1042 m depth, during hydrocarbon exploration activities in the Ruvuma Basin off Tanzania. The observation, which occurred during night hours, is the deepest accurately recorded for this species and the first deep-water record for the Indian Ocean. The record adds support for the occurrence in deep water during night hours being a widespread and possibly common behaviour in this species, and further expands a small but growing literature that meso- and bathypelagic environments may be of greater importance to elasmobranchs previously considered to be primarily epipelagic.

Global phylogeography of the scalloped hammerhead shark ( Sphyrna lewini )

2006 ◽  
Vol 15 (8) ◽  
pp. 2239-2251 ◽  
Author(s):  
K. M. DUNCAN ◽  
A. P. MARTIN ◽  
B. W. BOWEN ◽  
H. G. DE COUET
Keyword(s):  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead

Genetic connectivity and historical demography of the blue barred parrotfish (Scarus ghobban) in the western Indian Ocean

2010 ◽  
Vol 157 (7) ◽  
pp. 1475-1487 ◽  
Author(s):  
Shakil Visram ◽  
Ming-Che Yang ◽  
Ruby Moothien Pillay ◽  
Sadri Said ◽  
Oskar Henriksson ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Historical Demography ◽  
Genetic Connectivity ◽  
Scarus Ghobban

Residency of the scalloped hammerhead shark (Sphyrna lewini) at Malpelo Island and evidence of migration to other islands in the Eastern Tropical Pacific

2011 ◽  
Vol 91 (2) ◽  
pp. 165-176 ◽  
Author(s):  
Sandra Bessudo ◽  
German Andres Soler ◽  
A. Peter Klimley ◽  
James T. Ketchum ◽  
Alex Hearn ◽  
...  
Keyword(s):  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Malpelo Island

scholarly journals Genome Assembly of the Roundjaw Bonefish (Albula glossodonta), a Vulnerable Circumtropical Sportfish

2021 ◽  
Author(s):  
Brandon D. Pickett ◽  
Sheena Talma ◽  
Jessica R. Glass ◽  
Daniel Ence ◽  
Paul D. Cowley ◽  
...  
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Indian Ocean ◽  
Genome Assembly ◽  
Anthropogenic Activities ◽  
Western Indian Ocean ◽  
Genetic Connectivity ◽  
High Quality ◽  
Widespread Species ◽  
High Quality Genome

ABSTRACTBackgroundBonefishes are cryptic species indiscriminately targeted by subsistence and recreational fisheries worldwide. The roundjaw bonefish, Albula glossodonta is the most widespread bonefish species in the Indo-Pacific and is listed as vulnerable to extinction by the IUCN’s Red List due to anthropogenic activities. Whole-genome datasets allow for improved population and species delimitation, which – prior to this study – were lacking for Albula species.ResultsWe generated a high-quality genome assembly of an A. glossodonta individual from Hawai‘i, USA. The assembled contigs had an NG50 of 4.75 Mbp and a maximum length of 28.2 Mbp. Scaffolding yielded an NG50 of 14.49 Mbp, with the longest scaffold reaching 42.29 Mbp. Half the genome was contained in 20 scaffolds. The genome was annotated with 28.3 K protein-coding genes. We then analyzed 66 A. glossodonta individuals and 38,355 SNP loci to evaluate population genetic connectivity between six atolls in Seychelles and Mauritius in the Western Indian Ocean. We observed genetic homogeneity between atolls in Seychelles and evidence of reduced gene flow between Seychelles and Mauritius. The South Equatorial Current could be one mechanism limiting gene flow of A. glossodonta populations between Seychelles and Mauritius.ConclusionsQuantifying the spatial population structure of widespread fishery species such as bonefishes is necessary for effective transboundary management and conservation. This population genomic dataset mapped to a high-quality genome assembly allowed us to discern shallow population structure in a widespread species in the Western Indian Ocean. The genome assembly will be useful for addressing the taxonomic uncertainties of bonefishes globally.

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