HYBRIDIZATION AMONG THE ANCIENT MARINERS - CHARACTERIZATION OF MARINE TURTLE HYBRIDS WITH MOLECULAR-GENETIC ASSAYS
HYBRIDIZATION AMONG THE ANCIENT MARINERS - CHARACTERIZATION OF MARINE TURTLE HYBRIDS WITH MOLECULAR-GENETIC ASSAYS
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DOI：
10.1093/oxfordjournals.jhered.a111579
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发表时间：
1995-07-01
影响因子：
3.1
通讯作者：
AVISE, JC
中科院分区：
文献类型：
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作者：
KARL, SA;BOWEN, BW;AVISE, JC
仅根据形态学证据很难验证海龟物种（龟科）之间杂交的报告，在这里，我们采用分子遗传学测定来记录代表龟科海龟五个属中的四个属的物种之间零星的、自然发生的可行种间杂交。使用来自单拷贝核位点的多个 DNA 标记，八个疑似杂种（基于形态）被确认为红海龟 (Caretta caretta) x 坎氏丽龟 (Lepi-dochelys kempii) (N = 1 个样本)、红海龟 x 玳瑁 (Eretmochelys imbricata) (N = 2)、红海龟 x 绿海龟 (Chelonia mydas) (N) 交配的产物。 = 4)，以及绿海龟 x 玳瑁 (N = 1)。线粒体 DNA 的分子标记允许在每次杂交中识别母本亲本物种。参与这些杂交事件的物种代表了被认为在 10-7500 万年前 (mya) 分离的进化谱系，因此可能是能够在自然界产生可行杂交的最古老的脊椎动物谱系之一。在某些情况下，人类对海龟生命周期的干预（例如，通过栖息地改变、圈养饲养或尝试建立新的繁殖地）可能增加了种间杂交的机会杂交。
Reports of hybridization between marine turtle species (family Cheloniidae) have been difficult to authenticate based solely on morphological evidence, Here we employ molecular genetic assays to document the sporadic, natural occurrence of viable interspecific hybrids between species representing four of the five genera of cheloniid sea turtles. Using multiple DNA markers from single-copy nuclear loci, eight suspected hybrids (based on morphology) were confirmed to be the products of matings involving the loggerhead turtle (Caretta caretta) x Kemp's ridley (Lepi-dochelys kempii) (N = 1 specimen), loggerhead turtle x hawksbill (Eretmochelys imbricata) (N = 2), loggerhead turtle x green turtle (Chelonia mydas) (N = 4), and green turtle x hawksbill (N = 1). Molecular markers from mitochondrial DNA permitted identification of the maternal parental species in each cross, The species involved in these hybridization events represent evolutionary lineages thought to have separated 10-75 million years ago (mya) and thus may be among the oldest vertebrate lineages capable of producing viable hybrids in nature, In some cases, human intervention with the life cycles of marine turtles (e.g., through habitat alteration, captive rearing, or attempts to establish new breeding sites) may have increased the opportunities for interspecific hybridization.