Spatial and temporal genetic heterogeneity in a natural Daphnia population
Spatial and temporal genetic heterogeneity in a natural Daphnia population
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自然水蚤种群的空间和时间遗传异质性
DOI：
10.1093/plankt/7.1.101
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发表时间：
1985
影响因子：
2.1
通讯作者：
L. Weider
中科院分区：
文献类型：
--
作者：
L. Weider
对栖息在永久性池塘中的水蚤种群进行了两年半的时空遗传变化研究。空间自相关分析表明，电泳法鉴定的基因型在池塘中的垂直和水平方向上经常是非随机分布的。池塘水质的变化与实验室实验中3个无性系的生活史差异有关。来自其他生命表实验的数据表明，温度和食物浓度影响基因适合度成分；没有一个单一的基因在所有条件下都是最适合的，这表明了基因与环境的交互作用。对溶解氧水平的操纵进一步揭示，一个克隆人在高氧水平下取代另一个克隆人，但在低氧水平下不会。这些结果表明，时空环境异质性可能对维持浮游枝角类种群的遗传变异(克隆多样性)具有重要意义。
Temporal and spatial genetic changes in aDaphnia pulexpopulation inhabiting a permanent pond were examined for 2½ years. Spatial autocorrelation analysis indicated that electrophoretically identified genotypes were frequently distributed non-randomly in the pond, both vertically and horizontally. Water quality variation in the pond was associated with life history differences of three clones in laboratory experiments. Data from additional life table experiments indicated that temperature and food concentration affected genotype fitness components; no single genotype was most fit under all conditions indicating genotype-environment interactions. Manipulations of dissolved oxygen levels revealed further that one clone displaced another clone at high, but not at low oxygen levels. These results imply that spatial and temporal environmental heterogeneity may be significant in the maintenance of genetic variation (clonal diversity) in planktonic cladoceran populations.