Population Structure of a Neotropical Migratory Fish: Contrasting Perspectives from Genetics and Otolith Microchemistry
Population Structure of a Neotropical Migratory Fish: Contrasting Perspectives from Genetics and Otolith Microchemistry
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DOI：
10.1080/00028487.2013.804005
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发表时间：
2013-09-01
影响因子：
1.4
通讯作者：
Flecker, Alexander S.
中科院分区：
文献类型：
--
作者：
Collins, Sarah M.;Bickford, Nate;Flecker, Alexander S.
制定洄游鱼类的保护战略需要了解种群之间的联系。新热带区河流中有多种具有重要经济意义的洄游鱼类，但对大多数鱼类的种群生物学知之甚少。我们研究了Prochilodus mariae的种群结构，这是委内瑞拉河流中发现的一种丰富的洄游鱼类，在区域渔业和生态系统动态中发挥着重要作用。通过耦合耳石微化学和微卫星遗传分析，我们能够在区域水平上评估个体鱼类的纳塔尔起源和遗传结构。化学的耳石核心推断单独的繁殖地为4的6个种群，与75-85%的个人从每条河共享纳塔尔的签名，是不同于其他人群。相比之下，我们没有发现遗传结构，表明这些河流之间的基因流动阻止了种群分化。这些不同的推论强调了保护迁徙物种的复杂性;耳石数据表明，确保渔业的可持续性需要认识到不同的繁殖种群，而基因流反映了进化时间尺度上更广泛的河流网络的连通性的重要性。我们的结论是，多种方法的方法可能往往是必要的，以充分了解洄游鱼类的空间生态和管理需求，因此，也影响当地的管理做法。接收日期：2012年6月8日;接受日期：2013年5月1日
Developing conservation strategies for migratory fishes requires an understanding of connectivity among populations. Neotropical rivers contain diverse and economically important assemblages of migratory fishes, but little is known about the population biology of most species. We examined the population structure of Prochilodus mariae, an abundant migratory fish species found in Venezuelan rivers that plays essential roles in both regional fisheries and ecosystem dynamics. By coupling otolith microchemistry and microsatellite genetic analyses, we were able to evaluate both natal origins of individual fish and genetic structure on a regional level. The chemistry of otolith cores inferred separate breeding grounds for four of six populations, with 75-85% of individuals from each river sharing a natal signature that is distinct from the other populations. In contrast, we detected no genetic structure, indicating that gene flow among these rivers prevents population differentiation. These disparate inferences underscore the complexity of conserving migratory species; otolith data suggest that ensuring fishery sustainability requires recognizing distinct breeding stocks, while gene flow reflects the importance of connectivity across the broader river network on an evolutionary time scale. We conclude that multiple methodological approaches may often be necessary to fully understand the spatial ecology and management needs of migratory fishes and, therefore, also influence local management practices. Received June 8, 2012; accepted May 1, 2013