Genetic evidence for mixed modes of reproduction in the coral Pocillopora damicornis and its effect on population structure
Genetic evidence for mixed modes of reproduction in the coral Pocillopora damicornis and its effect on population structure
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DOI：
10.3354/meps306115
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发表时间：
2006-01
影响因子：
2.5
通讯作者：
K. Whitaker
中科院分区：
文献类型：
--
作者：
K. Whitaker
等位酶电泳的6个多态位点被用来估计的相对重要性，在西澳大利亚州的珊瑚Pocillopora damicornis种群的有性和无性生殖，并推断它们之间的幼虫扩散的程度。大量的无性繁殖的证据，但变量被发现。只有96的644个珊瑚头采样显然是性的起源，和10个人口中的8个表现出大的偏离Hardy-Weinberg平衡作为杂合子过剩和赤字的结果。多位点的基因型多样性值显着小于预期的10个采样的人口中的8个，但这些值的幅度变化很大（范围G 0：G e = 0.072至0.770）。种群之间的显着遗传细分（F ST = 0.360），这不是由于不同的珊瑚礁（F RT = 0.080），栖息地类型（F HT = -0.039），或种群之间的地理距离（Mantel检验p = 0.129）。然而，两两比较发现显着的遗传细分在所有的空间尺度采样。此外，这种细分在很大程度上保持甚至在人群中的假定性起源（F ST = 0.175）。这些结果是一致的概念，在宁格鲁和豪特曼Abrolhos群岛的珊瑚礁主要是自我播种，无性繁殖的新兵有相当大的影响，当地的丰富和人口结构。
Allozyme electrophoresis of 6 polymorphic loci was used to estimate the relative importance of sexual and asexual reproduction in Western Australian populations of the coral Pocillopora damicornis and to infer the extent of larval dispersal between them. Evidence for considerable yet variable amounts of asexual reproduction was found. Only 96 of a total of 644 coral heads sampled were apparently of sexual origin, and 8 of the 10 populations showed large departures from Hardy-Weinberg equilibria as a result of both heterozygote excesses and deficits. Multi-locus genotypic diversity values were significantly less than expected for 8 of the 10 populations sampled, but the magnitude of these values varied enormously (range G 0 :G e = 0.072 to 0.770). Significant genetic subdivision among populations was found (F ST = 0.360) that was not attributable to different reefs (F RT = 0.080), habitat type (F HT = -0.039), or geographical distance between populations (Mantel test p = 0.129). However, pairwise comparisons revealed significant genetic subdivision at all spatial scales sampled. Furthermore, this subdivision was largely maintained even among populations of putative sexual origin (F ST = 0.175). These results are consistent with the notion that reefs at Ningaloo and the Houtman Abrolhos Islands are primarily self-seeding and that asexually derived recruits have a considerable effect on local abundance and population structure.