1. Wandering behaviour prevents inter and intra oceanic speciation in a coastal pelagic fish
- Author
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Regina L. Cunha, Ana A. Ramos, Rita Castilho, and Gonçalo Silva
- Subjects
0106 biological sciences ,0301 basic medicine ,Old World ,Pleistocene ,Evolution ,Oceans and Seas ,Inexistente ,media_common.quotation_subject ,Science ,Population Dynamics ,Wandering Behavior ,Biology ,Genetic differentiation ,DNA, Mitochondrial ,010603 evolutionary biology ,01 natural sciences ,Article ,Divergence ,Anchovy Engraulis-Encrasicolus ,03 medical and health sciences ,Phylogenetics ,Maximum-likelihood-estimation ,Cape ,Animals ,14. Life underwater ,Glacial period ,Population-structure ,Phylogeny ,media_common ,Coalescent approach ,Diversity ,Multidisciplinary ,Behavior, Animal ,Ecology ,Fishes ,Bayes Theorem ,Pelagic zone ,Genus Engraulis ,Speciation ,030104 developmental biology ,Medicine ,R-package ,Microsatellite Repeats ,Model - Abstract
Small pelagic fishes have the ability to disperse over long distances and may present complex evolutionary histories. Here, Old World Anchovies (OWA) were used as a model system to understand genetic patterns and connectivity of fish between the Atlantic and Pacific basins. We surveyed 16 locations worldwide using mtDNA and 8 microsatellite loci for genetic parameters, and mtDNA (cyt b; 16S) and nuclear (RAG1; RAG2) regions for dating major lineage-splitting events within Engraulidae family. The OWA genetic divergences (0-0.4%) are compatible with intra-specific divergence, showing evidence of both ancient and contemporary admixture between the Pacific and Atlantic populations, enhanced by high asymmetrical migration from the Pacific to the Atlantic. The estimated divergence between Atlantic and Pacific anchovies (0.67 [0.53-0.80] Ma) matches a severe drop of sea temperature during the Gunz glacial stage of the Pleistocene. Our results support an alternative evolutionary scenario for the OWA, suggesting a coastal migration along south Asia, Middle East and eastern Africa continental platforms, followed by the colonization of the Atlantic via the Cape of the Good Hope. Portuguese Foundation for Science & Technology (FCT) [SFRH/BD/36600/2007]; FCT [UID/MAR/04292/2013, SFRH/BPD/65830/2009]; FCT strategic plan [UID/Multi/04326/2013] info:eu-repo/semantics/publishedVersion
- Published
- 2017