Genetics and shell morphology in a hybrid zone between the hard clams Mercenaria mercenaria and M. campechiensis
Genetics and shell morphology in a hybrid zone between the hard clams Mercenaria mercenaria and M. campechiensis
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硬蛤 Mercenaria Mercenaria 和 M. Campechiensis 杂交区的遗传学和贝壳形态
DOI：
10.1007/bf00391961
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发表时间：
1989
期刊：
影响因子：
2.4
通讯作者：
J. Manzi
中科院分区：
文献类型：
--
作者：
R. T. Dillon;J. Manzi
居群为（Mercenaria cruciaria（L.）来自美国南卡罗来纳州和M. campechiensis（Gmelin），于1987年采自美国佛罗里达墨西哥湾。这两个物种在所有七个酶位点的测试，以及在壳脊的厚度和珍珠层的颜色不同。新月形的差异不大，虽然相对壳宽，壳重，新月形大小的差异，使物种之间的形态歧视可能。1985年从佛罗里达大西洋沿岸的印度河泻湖采集的蛤样本中，贝壳脊、珍珠层颜色和多变量形态测量学并不独立。个体与厚脊，白色珍珠层，和/或campechiensis样形态具有显着不同的等位基因频率在大多数酶基因座的个体与薄脊，紫色珍珠层，和/或紫珠状形态。这种偏离的方向与对M.紫茎泽兰和M. campechiensis。M.紫茎泽兰数量多于M.在印度河样本中发现了campechiensis，但大多数蛤蜊似乎是杂交种。
Populations of Mercenaria mercenaria (L.) from South Carolina, USA, and M. campechiensis (Gmelin) from the Gulf of Mexico, Florida, USA, were sampled in 1987. The two species differed at all of seven enzyme loci tested, as well as in the thickness of shell ridges and nacre color. The difference in lunule shape was not great, although differences in relative shell width, shell weight, and lunule size make morphometric discrimination between the species possible. Shell ridges, nacre color, and multivariate morphometrics in a sample of clams collected from the Indian River Lagoon on the Atlantic coast of Florida in 1985 do not assort independently. Individuals with thick ridges, white nacre, and/or campechiensis-like morphometrics have significantly different allele frequencies at most enzyme loci from individuals with thin ridges, purple nacre, and/or mercenaria-like morphometrics. The deviations are in the direction predicted from the analysis of the allopatric populations of M. mercenaria and M. campechiensis. M. mercenaria outnumber M. campechiensis in the Indian River sample, but the majority of the clams seem to be hybrids.