Population genetic structure of the indian scad, Decapterus russelli across indian ocean and Indo-Malay archipelago

Jose, Anjaly and Sukumaran, Sandhya and Raj, Neenu and Nisha, K (2023) Population genetic structure of the indian scad, Decapterus russelli across indian ocean and Indo-Malay archipelago. In: International Biotechnology Conclave 2023.

Text International Biotechnology Conclave_2023_Sandhya Sukumaran.pdf Download (117kB)

Abstract

The Indian scad, Decapterus russelli is an important pelagic Carangidae widely distributed throughout the Indian Ocean and Indo-West Pacific. Although widespread in the Indian Ocean, information on genetic structure of this species is lacking compared to its IndoMalay Archipelago (IMA) counterparts. The present study was conducted to investigate the genetic population structure of D. russelli using mitochondrial (Cyt b) and nuclear (DrAldoB1) markers along Indian waters. The results indicated the occurrence of a single panmictic stock throughout the Indian Ocean region. Phylogenetic analysis revealed that there is no geographical clustering of lineages. However, significant genetic differentiation has been observed between the Indian Ocean and IMA populations. Pairwise FST comparisons, AMOVA and SAMOVA revealed the existence of two distinct genetic stocks of D. russelli in the Indian Ocean and the IMA. The observed genetic variation between populations was high. A plausible explanation for the observed genetic differentiation between the Indo-Malay Archipelago and the Indian Ocean regions suggests the influence of historical isolation, sea surface currents, and biotic and abiotic characteristics of the ocean. Also, there was a significant association between genetic distance and geographic distance in a manner consistent with isolation by distance. This led to the development of a phylogeographic break of this species between these regions. The results of these findings suggest that Indian Ocean D. russelli should be managed as a single stock throughout its range. In addition, the Indian Ocean stocks and the Indo-Malaysia stocks can be managed separately.

Actions (login required)

View Item