Mediterranean swordfish ( Xiphias gladius Linnaeus, 1758) population structure revealed by microsatellite DNA: genetic diversity masked by population mixing in shared areas

PeerJ

article

Tommaso Righi¹  Andrea Splendiani¹  Tatiana Fioravanti¹  Andrea Petetta¹  Michela Candelma¹  Giorgia Gioacchini¹  Kyle Gillespie²  Alex Hanke²  Oliana Carnevali¹  Vincenzo Caputo Barucchi¹ 

[1] Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche;Fisheries and Oceans Canada, St. Andrews Biological Station

关键词: DAPC;    Swordfish;    Mediterranean Sea;    Microsatellites;    Population genetics;    Population structure;   

DOI  :  10.7717/peerj.9518

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundThe Mediterranean swordfish stock is overfished and considered not correctly managed. Elucidating the patterns of the Mediterranean swordfish population structure constitutes an essential prerequisite for effective management of this fishery resource. To date, few studies have investigated intra-Mediterranean swordfish population structure, and their conclusions are controversial.MethodsA panel of 20 microsatellites DNA was used to investigate fine-scale population structuring of swordfish from six main fishing areas of the Mediterranean Sea.ResultsThis study provides evidence to reject the hypothesis of a single swordfish population within the Mediterranean Sea. DAPC analysis revealed the presence of three genetic clusters and a high level of admixture within the Mediterranean Sea. Genetic structure was supported by significant FST values while mixing was endorsed by the heterozygosity deficit observed in sampling localities indicative of a possible Wahlund effect, by sampling admixture individuals. Overall, our tests reject the hypothesis of a single swordfish population within the Mediterranean Sea. Homing towards the Mediterranean breeding areas may have generated a weak degree of genetic differentiation between populations even at the intra-basin scale.

【 授权许可】

CC BY