They are young, and they are many: dating freshwater lineages in unicellular dinophytes

?erdoner ?alasan An?e; Kretschmann Juliane; Gottschling Marc

摘要

Summary >Dinophytes are one of few protist groups that have an extensive fossil record and are therefore appropriate for time estimations. However, insufficient sequence data and strong rate heterogeneity have been hindering to put dinophyte evolution into a time frame until now. Marine‐to‐freshwater transitions within this group are considered geologically old and evolutionarily exceptional due to strong physiological constraints that prevent such processes. Phylogenies based on concatenated rRNA sequences (including 19 new GenBank entries) of two major dinophyte lineages, Gymnodiniaceae and Peridiniales, were carried out using an uncorrelated molecular clock and five calibration points based on fossils. Contrarily to previous assumptions, marine‐to‐freshwater transitions are more frequent in dinophytes (i.e. five marine‐freshwater transitions in Gymnodiniaceae, up to ten but seven strongly supported transitions in Peridiniales), and none of them occurred as early as 140 MYA. Furthermore, most marine‐to‐freshwater transitions, and the followed diversification, took place after the Cretaceous–Paleogene boundary. Not older than 40 MYA, the youngest transitions within Gymnodiniaceae and Peridiniales occurred under the influence of the Eocene climate shift. Our evolutionary scenario indicates a gradual diversification of dinophytes without noticeable impact of catastrophic events, and their freshwater lineages have originated several times independently at different points in time. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”XML：Lang =“en”> <标题类型=“main”>摘要</ title> > Dinophytes是具有广泛化石记录的少数蛋白质组之一，因此适当估计。然而，序列数据不足和强速率异质性一直在妨碍进入时间帧的时间框架。由于强大的生理限制，该组内的海洋到淡水过渡被视为地质古老，并且在地质上旧的并且进化地出现异常，因为强烈的生理限制是防止这些过程的强烈的生理限制。基于两种主要的Dinophyte谱系，Gymnodiniaceae和绝经症的级联RRNA序列（包括19个新的Genbank条目）的系统发育是使用基于化石的未胶合分子时钟和五个校准点进行的。与先前的假设相反，含水水滴的淡水过渡更频繁（即，在Gynnodineae中的五次海洋淡水过渡，最多七个，但七分之一的强烈支持的过渡期），并且他们都没有早在140 mya。此外，大多数海洋到淡水过渡和后次多样化发生在白垩纪 - 古雄性边界后。不超过40 mya，在农村气候变化的影响下，健康尼奥基亚洲和白天的最小过渡。我们的进化场景表明，没有灾难性事件的显着影响的Dinophytes的逐渐多样化，它们的淡水谱系已经在不同的时间点独立起源于多次。</ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" > 著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-22868/'>《Environmental microbiology 》</a> <b style="margin: 0 2px;">|</b><span>2019年第11期</span><b style="margin: 0 2px;">|</b> <span>共11页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=?erdoner ?alasan An?e&option=202" target="_blank" rel="nofollow">?erdoner ?alasan An?e;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kretschmann Juliane&option=202" target="_blank" rel="nofollow">Kretschmann Juliane;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gottschling Marc&option=202" target="_blank" rel="nofollow">Gottschling Marc;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department Biologie/Chemie BotanikUniversit?t OsnabrückBarbarastr. 11 49076 Osnabrück Germany;</p> <p>Department BiologieSystematische Botanik und Mykologie GeoBio‐Center Ludwig‐Maximilians‐Universit?t MünchenMenzinger Street. 67 80638 Munich Germany;</p> <p>Department BiologieSystematische Botanik und Mykologie GeoBio‐Center Ludwig‐Maximilians‐Universit?t MünchenMenzinger Street. 67 80638 Munich Germany;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li> <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span> <a href="https://www.zhangqiaokeyan.com/clc/183.html" title="微生物学">微生物学 ;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> </p> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023229396.html">They are young, and they are many: dating freshwater lineages in unicellular dinophytes</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=?erdoner ?alasan An?e&option=202" target="_blank" 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