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首页> 外文期刊>Freshwater science >Impact of landscape on spatial genetic structure and diversity of Coenagrion mercuriale (Zygoptera: Coenagrionidae) in northern France
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Impact of landscape on spatial genetic structure and diversity of Coenagrion mercuriale (Zygoptera: Coenagrionidae) in northern France

机译：景观对法国北部尾Co（Coenagrion mercuriale）（Zygoptera：Coenagrionidae）的空间遗传结构和多样性的影响

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摘要

Loss and fragmentation of habitat is a current main cause of biodiversity loss in freshwater habitats. Odonates (dragonflies and damselflies) depend on these habitats to complete their development. Fragmentation may be a particular threat for odonates because it generates a network of small habitat patches within which populations could suffer from isolation and loss of genetic diversity. The southern damselfly Coenagrion mercuriale is categorized on the IUCN red list as Near Threatened, largely because of population fragmentation and demographic declines associated with changes in land use. Small populations at the margin of this species' range are of particular concern because they would be prone to detrimental effects of habitat fragmentation if this species were a poor disperser. We sampled C. mercuriale in 16 habitat patches (localities) at 4 main sites in the department of Pasde-Calais in northwestern France to quantify factors that affect dispersal and genetic diversity. Specimens were genotyped at 12 microsatellite loci to quantify genetic diversity, genetic differentiation, and the potential effect of landscape variables on genetic differentiation, and to detect any potential source-sink structure. Habitat separation had a limiting effect on dispersal by C. mercuriale, resulting in 3 main genetic clusters and weak divergence at the main site of Vallee de la Course. Genetic differentiation was low in each main site, implying that the localities within sites were connected at scales of up to similar to 2 km, albeit with some evidence for isolation at the more isolated localities. Given the degree of isolation of some areas and a lack of apparent genetic mixing in the intervening populations, any movement among the most distantly separated sites must have occurred some time ago. We identified barriers to dispersal, such as woodland, but detecting an unambiguous effect of certain variables, such as urbanization, was difficult because many landscape features were highly correlated.
机译：生境的丧失和破碎化是当前淡水生境生物多样性丧失的主要原因。齿形动物（蜻蜓和豆娘）依靠这些栖息地来完成它们的发育。碎片化可能对长齿藻类造成特殊威胁，因为它会生成一个小栖息地斑块的网络，使种群可能遭受隔离和遗传多样性丧失的困扰。南部豆娘Coenagrion mercuriale被列为自然保护联盟红色名录中的“濒临灭绝”，这主要是由于人口分散和与土地利用变化相关的人口下降。处于该物种范围边缘的小种群尤其令人担忧，因为如果该物种的传播能力较差，它们很容易受到栖息地破碎化的不利影响。我们在法国西北部Pasde-Calais部门的4个主要地点的16个栖息地斑块（地区）中取样了C. mercuriale，以量化影响扩散和遗传多样性的因素。在12个微卫星位点对标本进行基因分型，以量化遗传多样性，遗传分化以及景观变量对遗传分化的潜在影响，并检测任何潜在的源库结构。栖息地的分离对C. mercuriale的扩散具有有限的影响，在Vallee de la Course的主要位点上导致了3个主要的遗传簇和弱的分化。每个主要位点的遗传分化程度都很低，这意味着位点内的各个区域之间的连接最大可达2 km，尽管有一些证据表明在较偏远的区域存在隔离的迹象。考虑到某些地区的隔离程度以及中间种群中缺乏明显的遗传混合，最远分离的地点之间的任何移动一定是在一段时间之前发生的。我们确定了诸如林地之类的传播障碍，但是要检测某些变量（如城市化）的明确影响是困难的，因为许多景观特征是高度相关的。

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