Interaction of landscape and life history attributes on genetic diversity, neutral divergence and gene flow in a pristine community of salmonids
Interaction of landscape and life history attributes on genetic diversity, neutral divergence and gene flow in a pristine community of salmonids
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DOI：
10.1111/j.1365-294x.2009.04409.x
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发表时间：
2009-12-01
影响因子：
4.9
通讯作者：
Ruzzante, Daniel E.
中科院分区：
文献类型：
--
作者：
Gomez-Uchida, Daniel;Knight, Thomas W.;Ruzzante, Daniel E.
景观遗传学为基于关键环境特征的遗传多样性空间格局预测提供了希望。然而，基于单一物种的推论在多大程度上可以扩展到整个社区还没有完全理解。我们使用了一个原始的和空间结构的三个内陆鲑鱼（Salvelinus fontinalis，萨尔莫盐，和Salvelinus alpinus）从格罗斯莫恩国家公园（加拿大纽芬兰）的社区，以测试几个预测景观和生活史的遗传多样性，中性分歧和基因流（m，迁移率）的变化的相互作用。景观因素始终影响多物种的遗传格局：（i）瀑布创造了强大的二分法的遗传多样性和分歧的人口以上和以下他们在所有三个鲑类;（ii）当代m减少与水路距离在所有三个物种，而中性遗传分歧（θ）增加与水路距离，虽然只有两个类群;（三）河流一般产生下游偏米种群之间的瀑布分开时，这些，但不是否则。相反，我们预期不同的生活史会导致中性分歧的等级（S。salar > S. fontinalis > S. alpinus）的基础上的差异，从以前的标记重捕研究的扩散能力和人口规模。这种层次结构还匹配不同程度的物种之间的空间遗传结构，通过个人为基础的分析。我们的结论是，而关键的景观属性举行权力，以预测多物种的遗传模式，在同等的社区，他们很可能与物种特有的生活史属性，如扩散，人口统计学和生态，这反过来又会影响整体的保护策略。
Landscape genetics holds promise for the forecasting of spatial patterns of genetic diversity based on key environmental features. Yet, the degree to which inferences based on single species can be extended to whole communities is not fully understood. We used a pristine and spatially structured community of three landlocked salmonids (Salvelinus fontinalis, Salmo salar, and Salvelinus alpinus) from Gros Morne National Park (Newfoundland, Canada) to test several predictions on the interacting effects of landscape and life history variation on genetic diversity, neutral divergence, and gene flow (m, migration rate). Landscape factors consistently influenced multispecies genetic patterns: (i) waterfalls created strong dichotomies in genetic diversity and divergence between populations above and below them in all three salmonids; (ii) contemporary m decreased with waterway distance in all three species, while neutral genetic divergence (theta) increased with waterway distance, albeit in only two taxa; (iii) river flow generally produced downstream-biased m between populations when waterfalls separated these, but not otherwise. In contrast, we expected differential life history to result in a hierarchy of neutral divergence (S. salar > S. fontinalis > S. alpinus) based on disparities in dispersal abilities and population size from previous mark-recapture studies. Such hierarchy additionally matched varying degrees of spatial genetic structure among species revealed through individual-based analyses. We conclude that, whereas key landscape attributes hold power to predict multispecies genetic patterns in equivalent communities, they are likely to interact with species-specific life history attributes such as dispersal, demography, and ecology, which will in turn affect holistic conservation strategies.