Patterns of the disposition of chromosomal hybrid zones in several species of harvestmen (Arachnida, Opiliones) in the Kinki District and Shikoku

近畿地区和四国地区几种收获动物（蜘蛛纲、蜘蛛纲）染色体杂种区的配置模式

基本信息

批准号：
19570086
负责人：
TSURUSAKI Nobuo
金额：
$ 2.91万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2009
项目状态：
已结题

项目摘要

We surveyed number of chromosomes of several species of harvestmen including Gagrellula ferruginea, Nelima nigricoxa, and N.genufusca in the Kinki District and adjacent areas of Honshu, and Shikoku to obtain information on geographical positions of chromosomal hybrid zones of these species. Most notable result was available in Gagrellula ferruginea in Shikoku. The results obtained from the survey were as follows : The diploid number of chromosomes increases from 2n=16 to 20 in the southern part of Takamatsu City, Kagawa Pref., through intermediate populations polymorphic for the number, although populations in eastern part of the prefecture including Is. Shodo invariably showed 2n=16. Populations in the western part of Kagawa Prefecture were polymorphic (2n=12/13/14) or monomorphic (2n=12) and the distributional range of the 2n=12 population overlaps that of the 2n=20 populations in Mt. Ryuo, without any indication of hybridization. This means that the 2n=12 population is reproductively fully isolated from the 2n=20 population. However, both the forms intergrade one another through populations with intermediate numbers (2n=14,16,18), making narrow zones of contact in the areas where two neighboring populations with different chromosome numbers abut in Sanyo side of Chugoku District (Okayama and Hyogo Prefectures), Honshu. Thus, the overlap of the distributional ranges of 2n=12 and 2n=20 populations with a series of intermediate populations connecting both ends can be considered a case of circular overlap that arose from successive increase (or decrease) of chromosome numbers.

我们对本州、四国近畿地区及邻近地区的赤色Gagrellula ferruginea、Nelima nigricoxa 和N.genufusca 等几种收割者的染色体数量进行了调查，以获得这些物种染色体杂交区的地理位置信息。最显着的结果是四国的 Gagrellula ferruginea。调查结果如下：香川县高松市南部的二倍体染色体数通过中间群体的数量多态性从2n=16增加到20，尽管该县东部的群体包括岛。 Shodo 总是显示 2n=16。香川县西部的种群具有多态性（2n=12/13/14）或单态性（2n=12），且2n=12种群的分布范围与龙王山2n=20种群的分布范围重叠，没有重叠。任何杂交的迹象。这意味着 2n=12 种群与 2n=20 种群在生殖上完全隔离。然而，这两种形式通过中间数量的种群（2n = 14,16,18）相互融合，在中国地区山阳一侧（冈山和兵库县）两个具有不同染色体数量的相邻种群邻接的区域中形成了狭窄的接触区域县），本州。因此，2n=12和2n=20种群的分布范围与连接两端的一系列中间种群的分布范围的重叠可以被认为是由于染色体数目连续增加（或减少）而产生的循环重叠的情况。