REPRODUCTIVE ISOLATING MECHANISMS BETWEEN TWO SYMPATRIC SIBLING SPECIES OF SEA SNAKES
REPRODUCTIVE ISOLATING MECHANISMS BETWEEN TWO SYMPATRIC SIBLING SPECIES OF SEA SNAKES
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两种同域海蛇兄弟物种之间的生殖隔离机制
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Mason
中科院分区：
文献类型：
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作者：
R. Shine;R. Reed;S. Shetty;M. Lemaster;R. Mason
摘要同域同源物中保持物种隔离的机制在许多生物中引起了分析，但在蛇中却没有。研究了两种两栖海蛇的亲缘种--长尾海蛇（Laticauda colubrina）和长尾海蛇（L.位于太平洋瓦努阿图共和国的埃法特岛。这两个类群在形态上几乎相同，只是L. colubrina比L.额肌没有自然杂交种的报道，这两个类群的地理分布表明同域物种形成的可能性。我们的野外工作表明，这两个类群往往是共位和重叠的繁殖季节。在户外竞技场的行为研究表明，这两个类群之间的分离是由控制雄性求爱的物种特异性线索维持的。这两个物种的男性追求同种女性，但不是异性女性。驱动这种分离的最接近的机制涉及化学线索。这两个分类群的成年雌性在皮肤中具有独特的脂质。雄性直接求偶行为（压下巴）己烷提取的样本的脂质同种，但不是异种女性。矮生种（L.）frontalis）比大型类群（L. colubrina），也许是因为偏好追求更大的女性意味着L。colubrina雄性不太可能追求L.额肌大小（即，小）女性，即使在没有信息素障碍。
Abstract Mechanisms that maintain species isolation within sympatric congeners have attracted analysis in many kinds of organisms, but not in snakes. We studied two sibling species of amphibious sea snakes (Laticauda colubrina and L. frontalis) on the island of Efate, in the Pacific Ocean republic of Vanuatu. The two taxa are almost identical morphologically, except that L. colubrina grows much larger than L. frontalis. No natural hybrids have been reported, and geographic distributions of the two taxa suggest the possibility of sympatric speciation. Our fieldwork shows that the two taxa are often syntopic and overlap in breeding seasons. Behavioral studies in outdoor arenas show that the separation between these two taxa is maintained by species-specific cues that control male courtship. Males of both species courted conspecific females but not heterospecific females. The proximate mechanism driving this separation involves chemical cues. Adult females of both taxa possess distinctive lipids in the skin. Males directed courtship behavior (chin-pressing) to hexane-extracted samples of lipids from conspecific but not heterospecific females. Males of the dwarf species (L. frontalis) were more selective courters than were those of the larger taxon (L. colubrina), perhaps because a preference for courting larger females means that L. colubrina males would be unlikely to court L. frontalis–sized (i.e., small) females even in the absence of pheromonal barriers.
影响因子：
56.9
作者：
MASON, RT;FALES, HM;CREWS, D
通讯作者：
CREWS, D