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Ecologie évolutive d'un genre d'acarien hématophage : approche phylogénétique des délimitations interspécifiques et caractérisation comparative des populations de cinq espèces du genre Dermanyssus (Acari : Mesostigmata)

Abstract : Micropredator species of Dermanyssus (Moss'gallinae-group), which parasitize birds, represent an interesting model for the study of loose associations. Thus, these unwinged arthropods do not stay on host (blood meal as quick as mosquitoe's), are part of the nest's microecosystem and their hosts are winged. Moreover, micropredator Dermanyssus include at least one species of economic importance in fowl farms, D. gallinae (the Poultry Red Mite), which enables the comparison between species restricted to wild avifauna and synanthropic species. At the beginning of the study, micropredator species are not clearly delimited. Most of species specific morphological characters are variable within species, in some cases within population, and are overlapping between species. In the aim to investigate the ecological needs for proliferation in D. gallinae and its ways for dispersal, a DNA-based comparative analysis involving this species and its close relatives has been performed. The first section consists of the clearing of the taxonomy and species delineations. In the second section, ecological and intrinsic data (host specificity, flexibility) are compared between species of the gallinae-group. One species has been described (D. apodis), one lineage within D. gallinae seems to represent a cryptic species and D. longipes currently groups two different entities. Important ecological differences between D. gallinae and other species seem to result not only from human activities, but also from intrinsic characteristics. Currently, the role of trade flows in D. gallinae's spread in layer farms appears to be essential, at least in France, as opposed to the role of wild birds (nearly nul).
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https://pastel.archives-ouvertes.fr/pastel-00005531
Contributor : Ecole Agroparistech <>
Submitted on : Friday, February 26, 2010 - 8:00:00 AM
Last modification on : Monday, October 19, 2020 - 11:11:05 AM
Long-term archiving on: : Thursday, December 1, 2016 - 3:07:16 AM

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  • HAL Id : pastel-00005531, version 1

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Lise Roy. Ecologie évolutive d'un genre d'acarien hématophage : approche phylogénétique des délimitations interspécifiques et caractérisation comparative des populations de cinq espèces du genre Dermanyssus (Acari : Mesostigmata). Sciences du Vivant [q-bio]. AgroParisTech, 2009. Français. ⟨NNT : 2009AGPT0040⟩. ⟨pastel-00005531⟩

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