Three sibling species within Contracaecum osculatum (Nematoda, Ascaridida, Ascaridoidea) from the Atlantic Arctic-Boreal region: reproductive isolation and host preferences

International Journal for Parasitology
G NascettiL Bullini

Abstract

Genetic variation within and between population samples from 22 locations of the Atlantic Arctic-Boreal region, including 1657 specimens morphologically assigned to Contracaecum osculatum, was electrophoretically analysed at 17 loci. Highly significant deviations from the Hardy-Weinberg equilibrium were found at various loci in several samples, owing to the existence of three distinct gene pools within C. osculatum (sensu lato) from the study area. These gene pools correspond to three biological species (provisionally designated A, B and C), characterized by distinct genotypes at several diagnostic loci. Reproductive isolation between C.osculatum A, B and C is confirmed by the lack of F1, recombinant, or backcross genotypes in sympatric areas, despite the occurrence of multiple infections. Mean heterozygosity per locus is on average 0.11 in species A, 0.10 in B and 0.07 in C. High levels of gene flow were found within each of the three species, the values of Nm (number of migrant individuals) ranging from 3.41 (C. osculatum C) to 5.77 (C. osculatum A). Average Nei's genetic distance is 0.46 between A and B, 0.50 between A and C and 0.77 between B and C. From these values, times of evolutionary divergence from 2 to 4 million yea...Continue Reading

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Citations

May 1, 1994·International Journal for Parasitology·P OrecchiaL Bullini
Apr 30, 1999·International Journal for Parasitology·R H Andrews, N B Chilton
Mar 1, 1997·Journal of Helminthology·M SilesM J Perteguer
Aug 7, 2008·PLoS Neglected Tropical Diseases·Aaron R JexRobin B Gasser
Mar 5, 2013·Journal of Helminthology·K Nadolna, M Podolska
Sep 16, 2009·Experimental Parasitology·Wenzhen FangDamin Luo
Sep 3, 2014·International Journal for Parasitology. Parasites and Wildlife·Shokoofeh Shamsi
Apr 15, 2014·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Juliana Novo BorgesCláudia Portes Santos
Nov 15, 2018·Parasites & Vectors·Rebecca Cole, Mark Viney

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