Effects of competition on lifetime estimates of inbreeding depression in the outcrossing plant Crepis sancta (Asteraceae)
Effects of competition on lifetime estimates of inbreeding depression in the outcrossing plant Crepis sancta (Asteraceae)
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DOI：
10.1046/j.1420-9101.2000.00175.x
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发表时间：
2000-05-01
影响因子：
2.1
通讯作者：
Escarre, J
中科院分区：
文献类型：
--
作者：
Cheptou, PO;Imbert, E;Escarre, J
在地中海异花受精的殖民物种Crepis sancta的两个种群中研究了近交衰退。为了检验这一假设，即近交衰退的程度可以修改的演替过程中，生长和生存的个人产生的两代自交杂交，包括自交进行了分析种间竞争（在自然植被）和没有种间竞争（通过删除自然植被）。近交衰退对种子生产的影响较弱。种子萌发受近亲繁殖的影响不大，但死亡率和头状花序的数量表现出近亲繁殖的抑制，特别是在竞争的存在下。这表明，近交衰退是非常敏感的环境条件的变化，如种间竞争。因此，不能认为近亲繁殖衰退在自然条件下是恒定的。
Inbreeding depression was studied in two populations of a Mediterranean allogamous colonizing species Crepis sancta. In order to test the hypothesis that the magnitude of inbreeding depression can be modified by successional processes, the growth and survival of individuals resulting from two generations of inbred crosses including selfing were analysed with interspecific competition (in natural vegetation) and without interspecific competition (by removing natural vegetation). Inbreeding depression was weak for seed production. Germination was little affected by inbreeding but mortality and the number of capitula showed inbreeding depression, especially in the presence of competition. This suggests that inbreeding depression is very sensitive to variations in environmental conditions such as interspecific competition. As a consequence, inbreeding depression cannot be considered as constant in natural conditions.