{"id":901,"date":"2020-01-31T14:25:16","date_gmt":"2020-01-31T17:25:16","guid":{"rendered":"https:\/\/www.ufrgs.br\/ictio\/?p=901"},"modified":"2020-01-31T14:36:15","modified_gmt":"2020-01-31T17:36:15","slug":"biogeography-habitat-transitions-and-hybridization-in-a-radiation-of-south-american-silverside-fishes-revealed-by-mitochondrial-and-genomic-rad-data","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ictio\/2020\/01\/31\/biogeography-habitat-transitions-and-hybridization-in-a-radiation-of-south-american-silverside-fishes-revealed-by-mitochondrial-and-genomic-rad-data\/","title":{"rendered":"Biogeography, habitat transitions and hybridization in a radiation of South American silverside fishes revealed by mitochondrial and genomic RAD data"},"content":{"rendered":"

<\/p>\n

Lily C. Hughes<\/i><\/a>\u00a0,\u00a0Yamila P. Cardoso<\/a>,\u00a0Julie A. Sommer<\/a>,\u00a0Roberto Cifuentes<\/a>,\u00a0Mariela Cuello<\/a>,\u00a0Gustavo M. Somoza<\/a>,\u00a0Mariano Gonz\u00e1lez\u2010Castro<\/a>,\u00a0Luiz R. Malabarba<\/a>,\u00a0Victor Cussac<\/a>,\u00a0Evelyn M. Habit<\/a>,\u00a0Ricardo Betancur\u2010R<\/a>\u00a0&\u00a0Guillermo Ort\u00ed<\/a><\/div>\n

 <\/p>\n

Abstract<\/p>\n

\n

Rivers and lake systems in the southern cone of South America have been widely influenced by historical glaciations, carrying important implications for the evolution of aquatic organisms, including prompting transitions between marine and freshwater habitats and by triggering hybridization among incipient species via waterway connectivity and stream capture events. Silverside fishes (Odontesthes<\/i>) in the region comprise a radiation of 19 marine and freshwater species that have been hypothesized on the basis of morphological or mitochondrial DNA data to have either transitioned repeatedly into continental waters from the sea or colonized marine habitats following freshwater diversification. New double digest restriction\u2010site associated DNA data presented here provide a robust framework to investigate the biogeographical history of and habitat transitions in\u00a0Odontesthes<\/i>. We show that\u00a0Odontesthes<\/i>\u00a0silversides originally diversified in the Pacific but independently colonized the Atlantic three times, producing three independent marine\u2010to\u2010freshwater transitions. Our results also indicate recent introgression of marine mitochondrial haplotypes into two freshwater clades, with more recurring instances of hybridization among Atlantic\u2010 versus Pacific\u2010slope species. In Pacific freshwater drainages, hybridization with a marine species appears to be geographically isolated and may be related to glaciation events. Substantial structural differences of estuarine gradients between these two geographical areas may have influenced the frequency, intensity and evolutionary effects of hybridization events.<\/p>\n

https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/mec.15350<\/a><\/p>\n

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(a) Marine and freshwater areas currently occupied by species of Odontesthes in southern South America, and photograph of Odontesthes perugiae by Y. P. Cardoso. (b) Sampling localities for ddRAD\u2010sequenced samples (see Appendix S1: Table S2 for description of population codes). (c) 2006 Morphological phylogenetic hypothesis for all Odontesthes species (Dyer, 2006), although lacking the newly described O. yacuman (Wingert, Ferrer, & Malabarba, 2017). Marine lineages are shown with grey branches. Shapes with black outlines indicate that cytb or ddRAD data were collected for this study for that species. (d) Maximum likelihood molecular hypothesis based on seven nuclear genes and cytb (Campanella et al., 2015), including three outgroups that inhabit the northern Pacific Ocean that are not otherwise included in this study. Branch lengths for molecular hypotheses are shown in substitutions per site, and grey branches indicate marine lineages. Species included in this study have black outlines around their shapes<\/p><\/div>\n<\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Lily C. Hughes\u00a0,\u00a0Yamila P. Cardoso,\u00a0Julie A. Sommer,\u00a0Roberto Cifuentes,\u00a0Mariela Cuello,\u00a0Gustavo M. Somoza,\u00a0Mariano Gonz\u00e1lez\u2010Castro,\u00a0Luiz R. Malabarba,\u00a0Victor Cussac,\u00a0Evelyn M. Habit,\u00a0Ricardo Betancur\u2010R\u00a0&\u00a0Guillermo Ort\u00ed   Abstract Rivers and lake systems in the southern cone of South America have been widely influenced by historical glaciations, carrying important implications for the evolution of aquatic organisms, including prompting transitions between marine and freshwater […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-901","post","type-post","status-publish","format-standard","hentry","category-sem-categoria"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/comments?post=901"}],"version-history":[{"count":2,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/901\/revisions"}],"predecessor-version":[{"id":904,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/901\/revisions\/904"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/media?parent=901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/categories?post=901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/tags?post=901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}