Studies of taxonomy, phylogeny and peculiar evolution of marine organisms inhabiting marine lakes from the viewpoint of vacarism

从vacarism的角度研究栖息在海洋湖泊的海洋生物的分类、系统发育和奇特进化

基本信息

批准号：
13304065
负责人：
HARA Yoshiaki
金额：
$ 25.71万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

In Palau Archipelago, about 80 marine lakes are located around Rocky Island District. These lakes are isolated from open sea and provide closed marine ecosystem to oceanic life systems. Almost all are geologically and genetically isolated from those inhabiting open seas, at least ten thousand years ago when the marine lakes were formed after he last glacial age. They show unique gross morphology, therefore it can be supposed that they have drifted on their own evolutionary processes. During our seven expeditions to Palau, 19 marine lakes have been accessed. On the limnological sense, these are divided into two of the holomictic and meromictic lakes. In the case of seaweeds in marine lakes, the similar species compositons and common dominant species share depending on these types of marine lakes. This is the center of this project for taking the evidences of their peculiar evolution of dominant or represenntative seaweeds and other groups of animal assembrages in the marine lakes based … More on the analyses of morphology and molecular phylogeny. The estimation of marine lakes' ages has been tried using the radio isotope and micropaleontological methods on the basis of sediments deposited in the bottom of lakes. Unfortunately, the suitable samples for these analyses could not be collected from all marine lakes we accessed. Consequently, we have to consider that the standard age of marine lakes in Palau is approxmately ten thoughsand years previously thought.From the results obtained here, the identification system of seaweeds in marine lakes based on their external morphology and internal strucutres was established with the verification of the molecular phylogenetic analysis. Owing to use this system, we could compare the genetic divergences of seaweeds inside and outside, as well as inter and intra marine lakes. At present, we could not show the clear evidences to occur the peculiar evolution of marine life systems in marine lakes, however, the possibilities could be exhibit on animal assebrages using mitochondrial genomes. While the peculiar evolution of seaweeds was mostly neglected at 18SrDNA, rbcL and ITS region levels. Further investigations will be needed after introducing molecules with much more rapid evolutionary speed or another methods possessing the resolving power to much more closely phylogenetic relationships. Less

在帕劳群岛（Palau Archipelago），大约80个海洋湖泊位于洛矶岛（Rocky Island）区附近。这些湖泊与公海隔离，并为海洋生命系统提供封闭的海洋生态系统。几乎所有人都与居住在开放海中的人处孤立，至少是一万年前，当时海洋湖泊是在他上次冰川时代形成的。他们表现出独特的形态，因此可以预期他们已经在自己的进化过程中漂移。在我们前往帕劳的七次探险中，已经进入了19个海洋湖泊。从羊水学的意义上讲，它们分为两个荷粒体和meromic湖。就海洋湖泊中的海藻而言，相似的物种复合材料和共同的主要物种取决于这些类型的海洋湖泊。这是该项目的中心，以获取其在海洋湖泊中占主导地位或代表性海藻和其他群体动物组装的奇特进化的证据……更多基于形态和分子系统发育的分析。根据沉积在湖泊底部的沉积物的基础，使用无线电同位素和微生石学方法尝试了海洋湖泊年龄的估计。不幸的是，无法从我们访问的所有海洋湖泊中收集这些分析的合适样品。因此，我们必须考虑到帕劳（Palau）的海洋湖泊的标准年龄大约是十个，尽管以前几年都想到。从这里获得的结果，基于其外部形态和内部结构的海藻鉴定系统是根据分子系统发育分析的验证建立的。由于使用该系统，我们可以比较内外海藻的遗传差异以及海洋内和海洋内湖泊。目前，我们无法证明海洋湖泊中海洋生物系统特殊演变的明确证据，但是，可以使用线粒体基因组在动物评估中暴露了可能性。虽然海藻的奇特进化在18srDNA，RBCL及其地区水平上大多被忽略。在引入更快的进化速度或具有更紧密的系统发育关系的另一种方法后，将需要进一步研究。较少的