The steppe species of gastrointestinal nematodes of small ruminants, with a focus on Marshallagia: climate as a key determinant

International audience We intended to relate the geographic distribution of ruminant gastrointestinal nematodes in relation to steppe climate (and vegetation). Data are either from literature or from newly acquired/ available results. Simple or more sophisticated meteorological indices were used to...

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Bibliographic Details
Published in:Parasite
Main Authors: Meradi, S., Bentounsi, B., Zouyed, I., Cabaret, Jacques
Other Authors: Université Hadj Lakhdar Batna 1, Université des Frères Mentouri (Constantine 1), Infectiologie Animale et Santé Publique (UR IASP), Institut National de la Recherche Agronomique (INRA)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2011
Subjects:
petit ruminant
climat
small ruminant
marshallagia
climate
host switch
steppe
capture
endoparasite nematode
nématode endoparasite
[SDV]Life Sciences [q-bio]
Canada
Spitzberg
Online Access:https://hal.inrae.fr/hal-02644873
https://hal.inrae.fr/hal-02644873/document
https://hal.inrae.fr/hal-02644873/file/parasite2011183p261_1.pdf
https://doi.org/10.1051/parasite/2011183261
Description
Summary:International audience We intended to relate the geographic distribution of ruminant gastrointestinal nematodes in relation to steppe climate (and vegetation). Data are either from literature or from newly acquired/ available results. Simple or more sophisticated meteorological indices were used to characterize the climate. Regression analyses were used to correlate climatic factors and presence of endoparasites from steppe areas. The distribution of one (Marshallagia) out of five endoparasite genera was concentrated mostly in steppic areas whereas other species were found also in other areas. In wild hosts the distribution of Marshallagia was much larger from Sptizberg to New World (northern territories in Canada or extreme south of America). In domestic small ruminants the presence of Marshallagia was identified more frequently and constantly in the area of original domestication and its early diffusion (from Northern Africa to Kashmir, Caucasia). The distribution of this parasite was correlated to low rainfalls which were not the case for all other endoparasites. After host switch (reindeer or south America camelids), it has expanded in other climatic areas, either colder or dryer. Notre objectif est de relier la distribution géographique des nématodes gastro-intestinaux des ruminants aux caractéristiques du climat (et de la végétation) steppique. Nous avons utilisé les données de la littérature et d’autres plus récentes que nous avons acquises. Nous avons recouru à des indices simples ou sophistiqués pour caractériser le climat. Des analyses de régression ont été utilisées pour estimer les relations entre les nématodes gastro-intestinaux et les facteurs climatiques. La distribution d’un genre (Marshallagia) sur les cinq rencontrés était surtout concentrée dans les zones steppiques, alors que les autres espèces étaient également rencontrées dans d’autres régions. Chez les hôtes sauvages, la distribution était beaucoup plus large, du Spitzberg au Nouveau Monde (territoires du nord du Canada et extrême sud ...

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