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dc.contributor.authorMattiucci, S.
dc.contributor.authorCianchi, R.
dc.contributor.authorNascetti, G.
dc.contributor.authorPaggi, L.
dc.contributor.authorSardella, N.
dc.contributor.authorTimi, J.
dc.contributor.authorWebb, S.C.
dc.contributor.authorBastida, R.
dc.contributor.authorRodriguez, D.
dc.contributor.authorBullini, L.
dc.date.accessioned2021-06-24T16:28:18Z
dc.date.available2021-06-24T16:28:18Z
dc.date.issued2003
dc.identifier.doi10.1023/A:1022145926409
dc.identifier.urihttp://hdl.handle.net/1834/26657
dc.description.abstractGenetic variation of Contracaecum ogmorhini (sensu lato) populations from different otariid seals of the northernand southern hemisphere was studied on the basis of 18 enzyme loci as well as preliminary sequence analysis ofthe mitochondrial cyt b gene (260 bp). Samples were collected from Zalophus californianus in the boreal regionand from Arctocephalus pusillus pusillus, A. pusillus doriferus and A. australis from the austral region. Markedgenetic heterogeneity was found between C. ogmorhini (sensu lato) samples from the boreal and austral region,respectively. Two loci (Mdh-2 and NADHdh) showed fixed differences and a further three loci (Iddh, Mdh-1 and6Pgdh) were highly differentiated between boreal and austral samples. Their average genetic distance was DNei =0.36 at isozyme level. At mitochondrial DNA level, an average proportion of nucleotide substitution of 3.7% wasobserved. These findings support the existence of two distinct sibling species, for which the names C. ogmorhini(sensu stricto) and C. margolisi n. sp., respectively, for the austral and boreal taxon, are proposed. A descriptionfor 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)and 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.
dc.formatapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subject.otherBiology
dc.subject.otherHealth
dc.titleGenetic evidence of two sibling species within the Contracoecum ogmorhini Johnson & Mawson 1941 complex (Nematoda; Anisakidae) from otariid seals in boreal and austral regions
dc.typearticle
dc.bibliographicCitation.issue1
dc.bibliographicCitation.titleSystematic Parasitology
dc.bibliographicCitation.volume54
dc.format.pagerange13-23
refterms.dateFOA2021-06-24T16:28:18Z
dc.source.legacyrecordurlhttp://aquaticcommons.org/id/eprint/10043
dc.source.legacydepositorid4006
dc.source.legacylastmod2015-06-01 17:35:21
dc.source.legacyid10043
dc.source.legacyagencyUniversidad Nacional de Mar del Plata


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