Evidence of Segregated Spawning in a Single Marine Fish Stock: Sympatric Divergence of Ecotypes in Icelandic Cod?
Evidence of Segregated Spawning in a Single Marine Fish Stock: Sympatric Divergence of Ecotypes in Icelandic Cod?
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DOI：
10.1371/journal.pone.0017528
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发表时间：
2011-03-07
期刊：
影响因子：
3.7
通讯作者：
Marteinsdottir, Gudrun
中科院分区：
文献类型：
--
作者：
Grabowski, Timothy B.;Thorsteinsson, Vilhjalmur;Marteinsdottir, Gudrun
人们越来越多地认识到海洋鱼类物种的种内多样性和种群结构，但很少有直接的证据表明，隔离机制，保持它或文件的生态范围。我们分析了深度和温度的历史收集的电子数据存储标签检索104大西洋鳕鱼在自由>= 1年，以评估可能的隔离机制，保持冰岛鳕鱼种群内的人口结构。该种群由两种不同的行为类型组成，居民沿海鳕鱼和迁移性锋面鳕鱼，每种都发生在两个地理上不同的种群中。尽管被捕获在同一个产卵场一起，我们显示的行为类型似乎繁殖隔离的细尺度的差异，产卵栖息地的选择，主要是深度。此外，不同的群体占据着不同的季节性热力和水深生态位，这些生态位在一年中的重叠程度通常很低。我们的研究结果表明，隔离机制，如不同的栖息地选择在产卵，可能有助于维持多样性和精细规模的种群结构在广播产卵的海洋鱼类。
There is increasing recognition of intraspecific diversity and population structure within marine fish species, yet there is little direct evidence of the isolating mechanisms that maintain it or documentation of its ecological extent. We analyzed depth and temperature histories collected by electronic data storage tags retrieved from 104 Atlantic cod at liberty >= 1 year to evaluate a possible isolating mechanisms maintaining population structure within the Icelandic cod stock. This stock consists of two distinct behavioral types, resident coastal cod and migratory frontal cod, each occurring within two geographically distinct populations. Despite being captured together on the same spawning grounds, we show the behavioral types seem reproductively isolated by fine-scale differences in spawning habitat selection, primarily depth. Additionally, the different groups occupied distinct seasonal thermal and bathymetric niches that generally demonstrated low levels of overlap throughout the year. Our results indicate that isolating mechanisms, such as differential habitat selection during spawning, might contribute to maintaining diversity and fine-scale population structure in broadcast-spawning marine fishes.