Estimating the propagule size of a cryptogenic crested newt population
Estimating the propagule size of a cryptogenic crested newt population
复制标题
估计隐源凤头蝾螈种群的繁殖体大小
DOI：
10.1111/j.1469-1795.2009.00331.x
复制
发表时间：
2010
影响因子：
3.4
通讯作者：
R. Jehle
中科院分区：
文献类型：
--
作者：
J. Arntzen;T. Burke;R. Jehle
在野外生物学中，遇到本地或引进的隐基因种群是一种常见但未被充分报道的现象。这些来源不明的本地物种的出现，阻碍了我们对物种自然分布范围的认识，并给保护管理决策带来了问题。遗传工具经常被用来根据空间地理变异推断自然种群或入侵种群的祖先。在这里，我们描述了隐源凤头蝾螈（Triturus cristatus）在距离其主要活动范围约25公里的地方的发生情况，该地区在半个世纪前已经被引入。我们首先验证了基于聚结体的分析的适用性，该分析基于先前发表的关于一个众所周知的引种（夏威夷群岛上的雷雀）的数据，从一个源池中重建了一个假定的繁殖体的创建个体的数量。在证明了该方法的有效性之后，我们将此分析应用于T. cristatus的情况，揭示了有效创建者的数量将与当前种群的有效承载能力处于同一数量级。因此，我们认为当地cristatus的发生实际上是自然起源，文献记载的引入对当前基因库的影响很小或没有影响。这一结果对我们理解与近缘物种共生的物种对栖息地的需求具有重要意义。
Encountering cryptogenic populations that are either native or introduced is a common but underreported phenomenon in field biology. Such local species' occurrences of unknown origin hamper our understanding of species' natural distribution ranges, and pose a problem to conservation management decisions. Genetic tools are frequently used to infer the ancestry of natural or invasive populations based on spatial geographical variation. Here we describe the occurrence of cryptogenic crested newts Triturus cristatus c. 25 km away from their main range and situated in an area where an introduction has taken place half a century ago. We first verify the suitability of a coalescent‐based analysis that reconstructs the number of founder individuals of a putative propagule from a source pool, based on previously published data documenting a well‐known introduction (the Laysan finch on the Hawaiian archipelago). After showing the validity of the approach, we apply this analysis to the case of T. cristatus, revealing that the number of effective founders would have been of the same order as the current effective carrying capacity of the population. We thus argue that the local T. cristatus occurrence is in fact of natural origin, with the documented introduction having little or no impact to the current gene pool. The result has major implications to our understanding of the species' habitat requirements in a zone of parapatry with a closely related species.