Seascape Genomics of the Smooth Hammerhead Shark Sphyrna zygaena Reveals Regional Adaptive Clinal Variation DOI Creative Commons
D.F. Grobler, Juliana D. Klein, Matthew L. Dicken

и другие.

Ecology and Evolution, Год журнала: 2024, Номер 14(12)

Опубликована: Дек. 1, 2024

ABSTRACT Globally, hammerhead sharks have experienced severe declines owing to continued overexploitation and anthropogenic change. The smooth shark Sphyrna zygaena remains understudied compared other members of the family Sphyrnidae. Despite its vulnerable status, a comprehensive understanding genetic landscape lacking in many regions worldwide. present study aimed conduct fine‐scale genomic assessment within highly dynamic marine environment South Africa's coastline, using thousands single nucleotide polymorphisms (SNPs) derived from restriction site‐associated DNA sequencing (3RAD). A combination differentiation‐based outlier detection methods genotype‐environment association (GEA) analysis was employed . Subsequent assessments putatively adaptive loci revealed distinctive south east cline. Among these, notable correlations between variation sea‐surface dissolved oxygen salinity were evident. Conversely, 111,243 neutral SNP markers lack regional population differentiation, finding that remained consistent across various analytical approaches. These results provide evidence for presence differential selection pressures limited spatial range, despite high gene flow implied by selectively dataset. This offers insights regarding potential impacts response fluctuating environmental conditions circumglobally distributed

Язык: Английский

Resource use of Sphyrna mokarran and S. lewini (Chondrichthyes) neonates and juveniles in the western Arabian Gulf: a stable isotope analysis DOI Creative Commons

J Lin Y,

HH Hsu,

Zahid Nazeer

и другие.

Endangered Species Research, Год журнала: 2024, Номер 54, С. 277 - 284

Опубликована: Май 27, 2024

The great hammerhead shark Sphyrna mokarran and the scalloped S. lewini are marine top predators with global distributions. However, limited information is available on trophic ecology of sharks in Indian Ocean. In this study, we measured stable nitrogen carbon isotopes muscle tissues neonates juveniles from waters western Arabian Gulf. general, values δ 15 N were lower (10.8-18.7‰) than (12.2-18.7‰), indicating a reliance food sources low values. Isotopic niche similarities observed between female male . We further considerable ontogenetic changes both (a reduction 19 to 12‰), reflecting maternal effect. effects total length sex isotope nonsignificant juveniles. Gulf likely serves as key feeding ground for By contrast, appears have level region.

Язык: Английский

Процитировано

0
Seascape Genomics of the Smooth Hammerhead Shark Sphyrna zygaena Reveals Regional Adaptive Clinal Variation DOI Creative Commons
D.F. Grobler, Juliana D. Klein, Matthew L. Dicken

и другие.

Ecology and Evolution, Год журнала: 2024, Номер 14(12)

Опубликована: Дек. 1, 2024

ABSTRACT Globally, hammerhead sharks have experienced severe declines owing to continued overexploitation and anthropogenic change. The smooth shark Sphyrna zygaena remains understudied compared other members of the family Sphyrnidae. Despite its vulnerable status, a comprehensive understanding genetic landscape lacking in many regions worldwide. present study aimed conduct fine‐scale genomic assessment within highly dynamic marine environment South Africa's coastline, using thousands single nucleotide polymorphisms (SNPs) derived from restriction site‐associated DNA sequencing (3RAD). A combination differentiation‐based outlier detection methods genotype‐environment association (GEA) analysis was employed . Subsequent assessments putatively adaptive loci revealed distinctive south east cline. Among these, notable correlations between variation sea‐surface dissolved oxygen salinity were evident. Conversely, 111,243 neutral SNP markers lack regional population differentiation, finding that remained consistent across various analytical approaches. These results provide evidence for presence differential selection pressures limited spatial range, despite high gene flow implied by selectively dataset. This offers insights regarding potential impacts response fluctuating environmental conditions circumglobally distributed

Язык: Английский

Процитировано

0