e-journal

Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south-western Atlantic Ocean

---

Population genetic analyses based on both mitochondrial cytochrome b and the internal transcribed spacer 2 of recombinant (r)DNA genes were implemented to examine hypotheses of population differentiation in the angular angel shark Squatina guggenheim, one of the four most-widespread endemic species inhabiting coastal ecosystems in the south-western Atlantic Ocean. A total of 82 individuals of S. guggenheim from 10 sampling sites throughout the Río de la Plata mouth, its maritime front, the outer shelf at the subtropical confluence and the coastal areas of the south-west Atlantic Ocean, were included. The analysis of molecular variance (AMOVA) based on the second internal transcribed spacer (its-2) region supports that the samples from the outer shelf represent an isolated group from other sites. Historical gene flow in a coalescent-based approach revealed significant immigration and emigration asymmetry between sampling sites. Based on the low level of genetic diversity, the existence of a long-term population decline or a past recent population expansion following a population bottleneck could be proposed in S. guggenheim. This demographic differentiation suggests a degree of vulnerability to overexploitation in this endemic and endangered south-west Atlantic Ocean shark, given its longevity and low reproductive potential.

Key words: cytochrome b gene; demographic history; elasmobranchs; its-2 gene; mito-nuclear; population genetics.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

Journal of Fish Biology

No. Panggil

-

Penerbit

Uruguay : The Fisheries Society of the British Isles., 2014

Deskripsi Fisik

Journal of Fish Biology (2015) 86, 186–202

Bahasa

English

ISBN/ISSN

doi:10.1111/jfb.1256

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

(2015) 86, 186–202

Subjek

PERIKANAN

Info Detail Spesifik

-

Pernyataan Tanggungjawab

Mutia/Agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar