نتایج جستجو برای: ectoparasitic infestations
تعداد نتایج: 3419 فیلتر نتایج به سال:
Reproduction of Criconernoides simile, Paratylenchus projectus, and Helicotylenchus pseudorobustus, alone and in certain combinations, was characterized during 50 days on the soybean cultivars Custer and Hood. Custer was the more suitable host for all three nematodes and C. simile was the most vigorous parasite on both cultivars. C. simile and H. pseudorobustus reproduced as well in combination...
Sexual size dimorphism (SSD) in mammals reveals the extent of sexual selection, which may in turn explain why males are often more infected by parasites than females and that parasites may contribute to the association between SSD and male-biased mortality. Here, we investigated the relationship between SSD in small mammals of Central Europe and the differences in sex infection by fleas. A comp...
We quantified within-population variation in the seasonal abundance of free-living adult trombiculid mites and infestation of collared lizards by parasitic mite larvae at the Arcadia Lake Dam in Edmond, OK, U.S.A. Lizards on one of two habitat patches (front) harbored many more larval mites, and were more rapidly re-infested after mites were removed experimentally. Although female and male liza...
The adaptive immune system has a major impact on parasite resistance and life history strategies. Immunological defence is costly both in terms of immediate activation and long-term maintenance. The 'good genes' model predicts that males with genotypes that promote a good disease resistance have the ability to allocate more resources to reproductive effort which favours the transmission of good...
'Carabidologists do it all' (Niemelä 1996a) is a phrase with which most European carabidologists are familiar. Indeed, during the last half a century, professional and amateur entomologists have contributed enormously to our understanding of the basic biology of carabid beetles. The success of the field is in no small part due to regular European Carabidologists' Meetings, which started in 1969...
Most animal groups vary extensively in size. Because individuals in certain sizes of groups often have higher apparent fitness than those in other groups, why wide group size variation persists in most populations remains unexplained. We used a 30-y mark-recapture study of colonially breeding cliff swallows (Petrochelidon pyrrhonota) to show that the survival advantages of different colony size...
Inbreeding, which increases homozygosity throughout the genome by increasing the proportion of alleles that are identical by descent, is expected to compromise resistance against parasitism. Here, we demonstrate that host inbreeding increases susceptibility to ectoparasitism in a natural fruit fly (Drosophila nigrospiracula) - mite (Macrocheles subbadius) association, and that this effect depen...
Theileriosis caused by parasites of the genus Theileria, is a vector-borne haemoprotozoan parasitic disease critical concern in small ruminants. This study aimed to explore infection status migratory Gaddi sheep and goats with from Theileria concurrence ectoparasite infestations using molecular methods. Seventy three apparently healthy animals were randomly sampled different flocks systematical...
This survey was conducted to identify and estimate the frequencies of ectoparasites of dogs in Tehran, Iran. A total of 143 dogs attended at the Small Animal Hospital of the Veterinary School, the University of Tehran, were examined for the presence of ectoparasites and dermatological lesions. Ectoparasite specimens and blood samples were sent to parasitology and hematology laboratories, respec...
BACKGROUND The objective was to determine the prevalence of ectoparasite infestations in referred companion dogs to veterinary hospital of Shahid Chamran University of Ahvaz, from 2009 to 2010. METHODS A total of 126 dogs were sampled for ectoparasites and examined by parasitological methods. The studied animals were grouped based on the age (<1 year, 1-3 years and >3 years), sex, breed and r...
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