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标题：Long-term aggregation of larval fish siblings during dispersal along an open coast
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作者：Daniel Ottmann ; Kirsten Grorud-Colvert ; Nicholas M. Sard 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2016
卷号：113
期号：49
页码：14067-14072
DOI：10.1073/pnas.1613440113
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：SignificanceLarval dispersal in the ocean is thought to be highly diffusive, but the pathways larvae follow during their pelagic stage are largely unknown, as direct tracking of larvae in the open ocean is not yet possible. We provide the first evidence of continuous aggregation of fish larvae over extensive periods in an oceanographically complex environment. This finding has far-reaching implications for our understanding of population genetics and dynamics, as it points to an underestimated layer of complexity in current models of dispersal and connectivity. Consideration of complex larval behavior during dispersal, including the aggregation of related individuals, can improve the accuracy of such models and lead to more effective management and conservation of marine organisms. 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.
关键词：larval dispersal ; kin aggregation ; genetic patchiness ; marine fish recruitment ; population connectivity