Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua
Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua
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DOI：
10.3354/meps301267
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Carvalho, GR
中科院分区：
文献类型：
--
作者：
Case, RAJ;Hutchinson, WF;Carvalho, GR
利用来自北海的大西洋鳕鱼 Cadus morhua L. 样本，以及之前发表的爱尔兰海、凯尔特海、冰岛、挪威峡湾和近海种群的遗传数据，我们描述了泛素 (PanI) 等位基因频率中惊人的宏观和微观地理模式。两个不同位置的 PanI 等位基因频率分布相对突然的不连续性与距离隔离的标准模式不一致，可能是由于种群混合、历史或当代自然选择、行为隔离或这些因素的组合引起的。在这里，我们研究了 PanI 等位基因的分布与温度、盐度和深度之间的关系。在东北大西洋，即使消除了地理距离的影响，温度也与 PanI 等位基因频率高度相关。在挪威峡湾，部分曼特尔测试表明，温度、盐度和深度都对幼鱼的 PanI 等位基因频率有显着影响。然而，来自波罗的海东部咸水的样本表明，盐度可能与 Pan I 等位基因频率分布有关，而在低盐度地区，与温度的关系较弱。 Pan I 等位基因频率与关键环境变量之间的强相关性以及现有文献的证据表明，环境条件在确定不同 PanI 基因型的分布中发挥着重要作用。环境数据、PanI 基因分型和中性标记的结合使用可能为检查局部适应、基因流水平和种群结构提供有价值的方法。
Using samples of Atlantic cod Cadus morhua L. from the North Sea, and previously published genetic data from the Irish and Celtic Seas, Iceland, and Norwegian fjord and offshore populations, we describe striking macro- and micro-geographic patterns in pantophysin (PanI) allele frequencies. The relatively abrupt discontinuity in PanI allele frequency distribution at 2 different locations is not congruent with standard patterns of isolation by distance and could arise from population admixtures, historical or contemporary natural selection, behavioural segregation or a combination of these factors. Here, we examined the relationships between the distributions of PanI alleles and temperature, salinity and depth. In the northeast Atlantic, temperature was highly correlated with PanI allele frequency, even when the effect of geographic distance was removed. In the Norwegian fjords, partial Mantel tests indicated that temperature, salinity and depth all had a significant effect on PanI allele frequency in juvenile fish. However, a sample from the brackish waters of the eastern Baltic Sea suggested that salinity may be linked to Pan I allele frequency distribution and that the relationship with temperature was weaker in areas of low salinity. Strong correlations between Pan I allele frequencies and key environmental variables, together with evidence from the available literature, suggested that environmental conditions play an important role in determining the distribution of different PanI genotypes. The combined use of environmental data, PanI genotyping and neutral markers may provide a valuable approach to examine local adaptation, levels of gene flow and stock structuring.