Experimental studies on the interaction between infections ofOstertagia leptospicularis and other bovineOstertagia species

Saqur, I. Al; Armour, J.; Bairden, K.; Dunn, A. M.; Jennings, F. W.; Murray, M.

doi:10.1007/bf00927133

Cited by 8 publications

(1 citation statement)

References 8 publications

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“…This poses a health threat to domestic ruminants in areas where they graze in pastures used by wild hosts, since every untypical infection may lead to high pathogenicity. It is also worth pointing out that such pathogenicity can significantly increase if co-infections with nematodes of the subfamily Ostertagiinae are considered [ 27 ]. On the other hand, wild ruminants can be exposed to clinical diseases after becoming infected with nematodes that are rather related to bovids [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

Host specificity and species diversity of the Ostertagiinae Lopez-Neyra, 1947 in ruminants: a European perspective

et al. 2018

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BackgroundNematodes of the subfamily Ostertagiinae appear to be rather specific to a species or family of hosts, but some are observed in a wide variety of hosts. The nematode Ostertagia leptospicularis draws special attention due to its presence or absence among the same host species in different European countries. Therefore, this paper focuses mainly on the host specificity among nematodes of the subfamily Ostertagiinae. The second aim of this study is to assess the possibility of treating O. leptospicularis as an Ostertagia species complex.MethodsData were gathered from post-mortem examinations of domestic and wild ruminants (n = 157), as well as bibliographical references (n = 96), which were pooled and discussed. The research area was limited to European countries, hence the studied ostertagiine species are limited to native ones; likewise, the host species. Special emphasis was placed on the mean abundance values that allowed a typical host or hosts for each nematode species to be specified. Correspondence analysis was performed to confirm the stated host specificity.ResultsThe analysis revealed that nematodes of this subfamily tend to use ruminants from a particular subfamily as their principal host. The results indicate that Ostertagia leptospicularis, similar to Teladorsagia circumcincta, may represent a potential species complex. This nematode, as the sole member of the subfamily Ostertagiinae, occurs in almost all representatives of the Bovidae subfamily, as well as in the Cervidae.ConclusionsDespite the stated narrow host specificity, the results obtained may suggest that O. leptospicularis is not strongly connected to any host or is comparably associated with a very wide and diverse group of hosts (Cervidae, Bovidae). The Ostertagia complex may have particular cryptic species or strains typical for any individual host or group of hosts. Such a conclusion requires further investigations on a wider scale.

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Section: Discussionmentioning

confidence: 99%

Host specificity and species diversity of the Ostertagiinae Lopez-Neyra, 1947 in ruminants: a European perspective

et al. 2018

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Comparative morphology of Ostertagia mossi and Ostertagia dikmansi (trichostrongylidae) from Odocoileus virginianus and comments on other Ostertagia spp. from the Cervidae

1993

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The synlophes of Ostertagia mossi Dikmans, 1931 and O. dikmansi Becklund &Walker, 1968 were found to be identical supporting recognition of these as the major and minor morphotypes, respectively, of a putative species pair within the Ostertagiinae. The cervical synlophe included three narrowly spaced, continuous, parallel ridges laterally and three parallel but more widely spaced ridges in the dorsal and ventral fields (Type II and Type A patterns, respectively). The disposition of the synlophe in conjunction with a long oesophageo-intestinal valve, and attributes of the genital cone and spicules are characteristics shared among other Ostertagia spp. from cervids in the Holarctic region that allow recognition of a species group morphologically distinct from the Ostertagiinae of domestic ruminants. The morphological similarity of O. mossi/O, dikmansi, O. leptospicularis Assadov, 1953/O. kolchida Popova, 1937 and O. gruehneri Skrjabin, 1929/O. arctica Mitzkewitsch, 1929 is substantial, but these species can be differentiated by small but constant differences in the synlophe and genital complex of males; females cannot be easily distinguished. The morphological similarity of this cryptic complex of species and their relatively restricted distribution among cervids suggests a coevolutionary history for hosts and parasites in the Holarctic region.

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Understanding chronic nematode infections: Evolutionary considerations, current hypotheses and the way forward

Behnke

Barnard

Wakelin

1992

International Journal for Parasitology

189

119

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Experimental studies on the interaction between infections ofOstertagia leptospicularis and other bovineOstertagia species

Cited by 8 publications

References 8 publications

Host specificity and species diversity of the Ostertagiinae Lopez-Neyra, 1947 in ruminants: a European perspective

Host specificity and species diversity of the Ostertagiinae Lopez-Neyra, 1947 in ruminants: a European perspective

Comparative morphology of Ostertagia mossi and Ostertagia dikmansi (trichostrongylidae) from Odocoileus virginianus and comments on other Ostertagia spp. from the Cervidae

Understanding chronic nematode infections: Evolutionary considerations, current hypotheses and the way forward

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