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</o:shapelayout></xml><![endif]--></head><body lang=ES link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Journal of Biogeography<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>First published: 21 November 2019<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'><a href="https://doi.org/10.1111/jbi.13749"><span lang=EN-US style='color:windowtext;text-decoration:none'>https://doi.org/10.1111/jbi.13749</span></a></span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:24.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Parallel loss of sweet and umami taste receptor function from phocids and otarioids suggests multiple colonizations of the marine realm by pinnipeds<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'><a href="https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Wolsan%2C+Mieczyslaw"><span lang=EN-US style='color:windowtext;text-decoration:none'>Mieczyslaw Wolsan</span></a></span><span style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'> </span><span style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'><a href="https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Sato%2C+Jun+J"><span lang=EN-US style='color:windowtext;text-decoration:none'>Jun J. Sato</span></a></span><span style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'> <span lang=EN-US><o:p></o:p></span></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:16.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Abstract<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Aim<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Pinnipeds are thought to have evolved from a North Pacific ancestor, although some fossil evidence suggests a nonmarine Arctic origin and separate invasions into the North Pacific and North Atlantic. We here set out to test differing hypotheses about the origin of pinnipeds through identification and age estimation of pinniped marine invasions.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Location<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Arctic, North America, North Atlantic, North Pacific.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Taxon<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Pinnipeds (seals, sea lions, walruses and their fossil relatives).<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Methods<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Because evidence indicates that taste loss in marine mammals and birds results from adaptation to the marine environment, we examined 16 representative pinnipeds for loss</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>of</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>function mutations in the <i>TAS1R1</i>, <i>TAS1R2</i> and <i>TAS1R3</i> genes encoding the sweet T1R2–T1R3 and umami (savory) T1R1–T1R3 receptors, and used the loss</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>of</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>function events of these receptors as indicators of marine invasion. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Results<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Numerous loss</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>of</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>function mutations were found in each pinniped <i>TAS1R</i> (22 in <i>TAS1R1</i>, 21 in <i>TAS1R2</i> and 42 in <i>TAS1R3</i>). Six mutations were shared by all phocids and six other mutations by all otarioids (otariids and odobenids), but none by all phocids and all otarioids. Selective pressures on <i>TAS1R1</i>, <i>TAS1R2</i> and <i>TAS1R3</i> were estimated to have been relaxed, respectively, 16.3, 20.1 and 19.8 million years ago (Myra) in phocids, and 12.1, 18.1 and 18.2 Myra in otarioids. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:13.5pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>Main conclusions<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>All <i>TAS1R</i>s, T1R1–T1R3 and T1R2–T1R3 are nonfunctional in all extant pinnipeds. Both receptors lost their function approximately 20 Myra in the Phocidae lineage and approximately 18 Myra in the Otarioidea lineage. Both lineages have colonized the marine realm independently, which entails nonmarine origins of both Pinnipedia and its stem lineage. Combined with fossil evidence, molecular findings here suggest an Arctic centre of long</span><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math","serif";mso-fareast-language:ES'>$B!>(J</span><span lang=EN-US style='font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:ES'>lasting (approximately 38–18 Myra) nonmarine pinniped evolution and at least five separate marine invasions, with the extinct (enaliarctid, Desmatophocidae, <i>Kolponomos</i>) and Otarioidea lineages entering the North Pacific and the Phocidae lineage the North Atlantic. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>