Synlophe in Ostertagia cf. kasakhstanica (Nematoda: Ostertagiinae), the Minor Morphotype of O. bisonis from Western North America

Hoberg, Eric P.; Abrams, Arthur

doi:10.2307/3285259

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…For example, in oxyurid nematodes, Ainsworth () identified male dimorphism in two species of Skrjabinodon nematodes, with morphological differences between male morphs consistent between the two species. Male dimorphism is also quite common in Ostertagiinae nematodes (Hoberg & Abrams, ; Grillo et al ., ; Hoberg et al ., ). In one representative of this group, Teladorsagia circumcincta , the frequency of morphological polymorphism is primarily density dependent, with minor male morphs more likely to occur in high intensity infections, their intensity being positively correlated with that of the larger morph (Craig et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Evolution of alternative male morphotypes in oxyurid nematodes: a case of convergence?

Jorge

Perera

Roca

et al. 2014

J of Evolutionary Biology

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Male dimorphism has been reported across different taxa and is usually expressed as the coexistence of a larger morph with exaggerated male traits and a smaller one with reduced traits. The evolution and maintenance of male dimorphism are still poorly understood for several of the species in which it has been observed. Here, we analyse male dimorphism in several species of reptile parasitic nematodes of the genus Spauligodon, in which a major male morph (exaggerated morph), which presents the traditional male morphological traits reported for this taxon, coexists with a minor morph with reduced morphological traits (i.e. reduced genital papillae) resembling more closely the males of the sister genus Skrjabinodon than Spauligodon major males. Because of the level of uncertainty in the results of ancestral state reconstruction, it is unclear if the existence of male dimorphism in this group represents independent instances of convergent evolution or an ancestral trait lost multiple times. Also, although the number of major males per host was positively correlated with the number of females, the same did not hold true for minor males, whose presence was not associated with any other ecological factor. Nevertheless, the existence of male dimorphism in Spauligodon nematodes is tentatively interpreted as resulting from alternative reproductive tactics, with differences in presence and number of individuals as indicators of differences in fitness, with the lower numbers of minor males per host likely maintained by negative frequency-dependent selection.

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Section: Introductionmentioning

confidence: 99%

Evolution of alternative male morphotypes in oxyurid nematodes: a case of convergence?

Jorge

Perera

Roca

et al. 2014

J of Evolutionary Biology

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“…Nematodes were cleared with 10 % glycerin in temporary total preparations (Ivashkin et al, 1971). Species identification were based on morphology, specifically on reproductive system peculiarities according to data of Ivashkin et al (1989), Drozdz (1995), Hoberg & Abrams (2001), Kuznetsov (2006). Due to scarcity of data on the morphology of Nematodirus spp.…”

Section: Methodsmentioning

confidence: 99%

On gastrointestinal nematodes of Mongolian gazelle (Procapra gutturosa)

et al. 2014

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The species composition of nematodes found at autopsy of abomasa and small intestines of 24 Mongolian gazelles in Eastern Mongolia is studied. Orloffia bisonis, Marshallagia mongolica, Nematodirus archari, N. andreevi, Trichostrongylus colubriformis, T. probolurus were registered. N. archari and N. andreevi were detected in Mongolian gazelle for the first time. All species of gastrointestinal nematodes found in Mongolian gazelles have already been registered in domestic ruminants of Mongolia. The validity of Orloffia genus is confirmed based on our own observations and literature data. Orloffia is monotypic genus with the only species O. bisonis represented by two morphs where “O. bisonis” is major and “O. kasakhstanica” is minor.

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Synlophe in Ostertagia cf. kasakhstanica (Nematoda: Ostertagiinae), the Minor Morphotype of O. bisonis from Western North America

Cited by 2 publications

References 3 publications

Evolution of alternative male morphotypes in oxyurid nematodes: a case of convergence?

Evolution of alternative male morphotypes in oxyurid nematodes: a case of convergence?

On gastrointestinal nematodes of Mongolian gazelle (Procapra gutturosa)

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