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Population assignment tests uncover rare long-distance marine larval dispersal events
Ecology ( IF 4.8 ) Pub Date : 2021-10-15 , DOI: 10.1002/ecy.3559
C C D'Aloia 1 , S M Bogdanowicz 2 , J A Andrés 2 , P M Buston 3
Affiliation  

Long-distance dispersal (LDD) is consequential to metapopulation ecology and evolution. In systems where dispersal is undertaken by small propagules, such as larvae in the ocean, documenting LDD is especially challenging. Genetic parentage analysis has gained traction as a method for measuring larval dispersal, but such studies are generally spatially limited, leaving LDD understudied in marine species. We addressed this knowledge gap by uncovering LDD with population assignment tests in the coral reef fish Elacatinus lori, a species whose short-distance dispersal has been well-characterized by parentage analysis. When adults (n = 931) collected throughout the species’ range were categorized into three source populations, assignment accuracy exceeded 99%, demonstrating low rates of gene flow between populations in the adult generation. After establishing high assignment confidence, we assigned settlers (n = 3,828) to source populations. Within the settler cohort, <0.1% of individuals were identified as long-distance dispersers from other populations. These results demonstrate an exceptionally low level of connectivity between E. lori populations, despite the potential for ocean currents to facilitate LDD. More broadly, these findings illustrate the value of combining genetic parentage analysis and population assignment tests to uncover short- and long-distance dispersal, respectively.

中文翻译:

种群分配测试揭示了罕见的远距离海洋幼虫传播事件

长距离扩散 (LDD) 对元种群生态学和进化具有重要意义。在由小型繁殖体(例如海洋中的幼虫)进行传播的系统中,记录 LDD 尤其具有挑战性。遗传亲本分析作为一种测量幼虫传播的方法已经获得了牵引力,但此类研究通常在空间上受到限制,使得 LDD 在海洋物种中的研究不足。我们通过在珊瑚礁鱼Elacatinus lori 中通过种群分配测试发现 LDD 来解决这一知识差距,该物种的短距离传播已通过亲子分析得到很好的表征。当成人(n = 931) 在整个物种范围内收集的数据被分为三个源种群,分配准确率超过 99%,表明成年一代种群之间的基因流动率较低。在建立高分配置信度后,我们将定居者 ( n  = 3,828)分配给源人口。在定居者队列中,<0.1% 的个体被确定为来自其他人群的长距离分散者。这些结果表明E之间的连接性极低。 萝莉人口,尽管洋流有可能促进 LDD。更广泛地说,这些发现说明了结合遗传亲子分析和种群分配测试以分别揭示短距离和长距离传播的价值。
更新日期:2021-10-15
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