Sur les différentes variétés de l’<i>ornithodorus erraticus</i>

Blanc, Georges; Chabaud, A. G.; Bruneau, J.

doi:10.1051/parasite/1951264361

Cited by 4 publications

(4 citation statements)

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“…Heisch and Grainger (1950) record erraticus in Kenya. Blanc, Chabaud and Bruneau (1951) record different sizes of erraticus in different areas in Morocco. Hoogstraal (personal communication, 1952) reports erraticus as being very common in Egypt, even in Cairo.…”

Section: London School Of Hygiene and Tropical Medicinementioning

confidence: 90%

Some Notes on the recorded Distribution of Old World Species of Ornithodoros (Acarina)

Leeson

1953

Bull. Entomol. Res.

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These notes are the result of an examination of the literature and are concerned with geographical distribution.The Beview of Applied Entomology, Series B, and the Tropical Diseases Bulletin were consulted and many papers were seen in the original; references to a selection of the more important of these is appended herewith. Of the ticks of the genus Ornithodoros occurring in the Old World about 40 names appear in published papers; of these about 20 seem to be valid species and five are well known and readily recognised: erraticus, lahorensis, moubata, savignyi and iholozani. Most of the Old World e -tttaiicus m •moubata t • tholojani Pig. 1.-Distribution of Ornithodoros erraticus, 0. moubata and 0. tholozani. In French Sudan the form of 0. erraticus is the variety sonrai.

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Section: London School Of Hygiene and Tropical Medicinementioning

confidence: 90%

Some Notes on the recorded Distribution of Old World Species of Ornithodoros (Acarina)

Leeson

1953

Bull. Entomol. Res.

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“…His 20 years of intensive research on TBRF in East Africa provided new insights on O. p. domesticus, suggesting the existence of at least four different ecological "races" locally adapted to different regions and presenting distinct temperature and humidity optima (Walton, 1962(Walton, , 1964(Walton, , 1979 & Campana, 1946;Balashov, 1972), with a special emphasis on favourable microclimatic conditions for its settlement in Israel and Russian regions, and anthropogenic effects in domestic areas (Avivi, 1967;Vasil'eva et al, 1991;Abidov et al, 1993). Within the second group, Baltazard et al (1950), Blanc et al (1951) andChabaud (1954) have investigated differences in morphology, biology, ecology and vectorial competence between O. erraticus and O. sonrai. Boiron (1949) in Senegal, Hoogstraal (1954 and Khalil et al (1984) in Egypt and more recently Oleaga-Perez et al (1990) in Spain studied the effect of climate, soil and host on the settlement patterns in these species in both domestic and wild areas.…”

Section: Relevant Characteristics Of Soft Ticks To Predict Their Nichementioning

confidence: 99%

Biological and ecological characteristics of soft ticks (Ixodida: Argasidae) and their impact for predicting tick and associated disease distribution

2009

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Summary :As evidence of global changes is accumulating, scientists are challenged to detect distribution changes of vectors, reservoirs and pathogens caused by anthropogenic and/or environmental changes. Statistical and mathematical distribution models are emerging for ixodid hard ticks whereas no prediction has ever been developed for argasid ones. These last organisms remain unknown and under-reported; they differ from hard ticks by many structural, biological and ecological properties, which complicate direct adaptation of hard tick models. However, investigations on bibliographic resources concerning these ticks suggest that distribution modelling based on natural niche concept and using environmental factors especially climate is also possible, bearing in mind the scale of prediction and their specificities including their nidicolous lifestyle, an indiscriminate host feeding and a short bloodmeal duration, as well as a flexible development cycle through diapause periods. Résumé : CARACTÉRISTIQUES BIOLOGIQUES ET ÉCOLOGIQUES DES TIQUES MOLLES (IXODIDA: ARGASIDAE) ET IMPLICATIONS QUANT À LA PREDICTION DE LEUR DISTRIBUTION ET DES MALADIES ASSOCIÉES Dès lors que des preuves du changement global s'accumulent, les scientifiques se doivent de détecter les changements de distribution de vecteurs, de réservoirs et de pathogènes causés par des modifications anthropogéniques ou environnementales. Alors que des modèles de distribution statistiques ou mathématiques, commencent à émerger pour les tiques dures (ixodidés), aucune prédiction n'est disponible pour les tiques molles (argasidés). Ces organismes restent inconnus et sous-estimés ; ils diffèrent des tiques

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“…Thus, the occurrence of both B. hispanica and B. crocidurae in Ornithodoros ticks from the Gharb region was unexpected and this probably reflects a recent range extension of this spirochete. In Mauritania and in several countries located south of the Sahara (Senegal, Gambia, and Mali), B. crocidurae is known to infect O. sonrai , a Sahelo‐Saharan species also distributed in Moroccco, Algeria, Tunisia, Libya, and Egypt, but only in the arid areas of these northern African countries (Blanc et al , Chabaud , Trape et al ). Since O. sonrai and B. crocidurae are known to be sympatric with O. marocanus and B. hispanica in the Marrakech area 350 km south of the Gharb (Chabaud , Diatta et al ), it is likely that the increasing aridity of northwestern Morocco has favored a range extension of both O. sonrai and B. crocidurae .…”

Section: Discussionmentioning

confidence: 99%

Borrelia crocidurae in Ornithodoros ticks from northwestern Morocco: a range extension in relation to climatic change?

Souidi

Boudebouch

Ezikouri

et al. 2014

Journal of Vector Ecology

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Tick-borne relapsing fever (TBRF) is caused by Borrelia spirochetes transmitted to humans by Argasid soft ticks of the genus Ornithodoros. We investigated the presence of Ornithodoros ticks in rodent burrows in nine sites of the Gharb region of northwestern Morocco where we recently documented a high incidence of TBRF in humans. We assessed the Borrelia infection rate by nested PCR and sequencing. All sites investigated were colonized by ticks of the Ornithodoros marocanus complex and a high proportion of burrows (38.4%) were found to be infested. Borrelia infections were observed in 6.8% of the ticks tested. Two Borrelia species were identified by sequencing: B. hispanica and B. crocidurae. The discovery in northwestern Morocco of Ornithodoros ticks infected by B. crocidurae represents a 350 km range extension of this Sahelo-Saharan spirochete in North Africa. The spread of B. crocidurae may be related to the increasing aridity of northwestern Morocco in relation to climate change. Journal of Vector Ecology 39 (2): 316-320. 2014.

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Sur les différentes variétés de l’ornithodorus erraticus

Cited by 4 publications

References 0 publications

Some Notes on the recorded Distribution of Old World Species of Ornithodoros (Acarina)

Some Notes on the recorded Distribution of Old World Species of Ornithodoros (Acarina)

Biological and ecological characteristics of soft ticks (Ixodida: Argasidae) and their impact for predicting tick and associated disease distribution

Borrelia crocidurae in Ornithodoros ticks from northwestern Morocco: a range extension in relation to climatic change?

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