首页> 外文OA文献 >Genetic evidence of two sibling species within the Contracoecum ogmorhini Johnson Mawson 1941 complex (Nematoda; Anisakidae) from otariid seals in boreal and austral regions
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Genetic evidence of two sibling species within the Contracoecum ogmorhini Johnson Mawson 1941 complex (Nematoda; Anisakidae) from otariid seals in boreal and austral regions

机译:北方和南方地区耳海豹中Contracoecum ogmorhini Johnson&Mawson 1941复合体(Nematoda; Anisakidae)内两个同胞物种的遗传证据。

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摘要

Genetic variation of Contracaecum ogmorhini (sensu lato) populations from different otariid seals of the northernudand southern hemisphere was studied on the basis of 18 enzyme loci as well as preliminary sequence analysis ofudthe mitochondrial cyt b gene (260 bp). Samples were collected from Zalophus californianus in the boreal regionudand from Arctocephalus pusillus pusillus, A. pusillus doriferus and A. australis from the austral region. Markedudgenetic heterogeneity was found between C. ogmorhini (sensu lato) samples from the boreal and austral region,udrespectively. Two loci (Mdh-2 and NADHdh) showed fixed differences and a further three loci (Iddh, Mdh-1 andud6Pgdh) were highly differentiated between boreal and austral samples. Their average genetic distance was DNei =ud0.36 at isozyme level. At mitochondrial DNA level, an average proportion of nucleotide substitution of 3.7% wasudobserved. These findings support the existence of two distinct sibling species, for which the names C. ogmorhiniud(sensu stricto) and C. margolisi n. sp., respectively, for the austral and boreal taxon, are proposed. A descriptionudfor C. margolisi n. sp. is provided. No diagnostic morphological characters have so far been detected; on the other hand, two enzyme loci, Mdh-2 and NADHdh, fully diagnostic between the two species, can be used for the routine identification of males, females and larval stages. Mirounga leonina was found to host C. ogmorhini (s.s.) inmixed infections with C. osculatum (s.l.) (of which C. ogmorhini (s.l.) was in the past considered to be a synonym)udand C. miroungae; no hybrid genotypes were found,confirming the reproductive isolation of these three anisakid species. The hosts and geographical range so far recorded for C. margolisi n. sp. and C. ogmorhini (s.s.) are given.
机译:在18个酶基因座以及线粒体cyt b基因(260 bp)的初步序列分析的基础上,研究了北半球和南半球不同OTARIID海豹种群中Contracaecum ogmorhini(sensu lato)种群的遗传变异。样品取自北方地区的圆叶鬼伞(Zalophus californianus) pusillus pusillus pusillus,多角土壤杆菌A. pusillus doriferus和南方土壤杆菌A. australis。在北方和南方地区的C. ogmorhini(sensu lato)样品之间分别发现了明显的预算异质性。两个基因座(Mdh-2和NADHdh)显示出固定的差异,另外三个基因座(Iddh,Mdh-1和 ud6Pgdh)在北样和南样之间高度区分。在同工酶水平上,它们的平均遗传距离为DNei = ud0.36。在线粒体DNA水平上,核苷酸取代的平均比例为3.7%。这些发现支持存在两个不同的同胞物种,其名称为C. ogmorhini ud(sensu stricto)和C. margolisi n。分别针对南方和北方分类单元。马氏梭菌的描述 ud。 sp。提供。到目前为止,尚未检测到诊断形态特征。另一方面,两个酶基因座Mdh-2和NADHdh在这两个物种之间具有完全诊断性,可用于常规鉴定雄性,雌性和幼体阶段。发现Mirounga leonina感染了C. ogmorhini(s.s.)与osculatum(s.l.)的混合感染(其中C. ogmorhini(s.l.)在过去被认为是同义词) udand C. miroungae;未发现杂种基因型,证实了这三种茴香属物种的生殖分离。迄今记录的马氏梭菌的寄主和地理范围。 sp。和C.ogmorhini(s.s.)。

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