Ottmann Daniel, Grorud-Colvert Kirsten, Sard Nicholas M, Huntington Brittany E, Banks Michael A, Sponaugle Su
Hatfield Marine Science Center, Oregon State University, Newport, OR 97365;
Department of Integrative Biology, Oregon State University, Corvallis, OR 97331.
Proc Natl Acad Sci U S A. 2016 Dec 6;113(49):14067-14072. doi: 10.1073/pnas.1613440113. Epub 2016 Nov 21.
Pelagic dispersal of most benthic marine organisms is a fundamental driver of population distribution and persistence and is thought to lead to highly mixed populations. However, the mechanisms driving dispersal pathways of larvae along open coastlines are largely unknown. To examine the degree to which early stages can remain spatially coherent during dispersal, we measured genetic relatedness within a large pulse of newly recruited splitnose rockfish (Sebastes diploproa), a live-bearing fish whose offspring settle along the US Pacific Northwest coast after spending up to a year in the pelagic environment. A total of 11.6% of the recruits in a single recruitment pulse were siblings, providing the first evidence for persistent aggregation throughout a long dispersal period. Such protracted aggregation has profound implications for our understanding of larval dispersal, population connectivity, and gene flow within demersal marine populations.
大多数底栖海洋生物的远洋扩散是种群分布和存续的一个基本驱动因素，并且被认为会导致种群高度混合。然而，驱动幼体沿着开阔海岸线扩散路径的机制在很大程度上尚不清楚。为了研究早期阶段在扩散过程中能够在空间上保持连贯的程度，我们测量了一大批新招募的裂鼻岩鱼（Sebastes diploproa）的遗传相关性，裂鼻岩鱼是一种胎生鱼类，其后代在远洋环境中度过长达一年的时间后在美国太平洋西北海岸定居。在一次单一的补充脉冲中，共有11.6%的新招募个体是兄弟姐妹，这为在漫长的扩散期内持续聚集提供了首个证据。这种长时间的聚集对于我们理解底栖海洋种群中的幼体扩散、种群连通性和基因流动具有深远意义。
