نتایج جستجو برای: falco naumanni
تعداد نتایج: 874 فیلتر نتایج به سال:
The study of cross-species pathogen transmission is essential to understanding the epizootiology and epidemiology of infectious diseases. Avian chlamydiosis is a zoonotic disease whose effects have been mainly investigated in humans, poultry and pet birds. It has been suggested that wild bird species play an important role as reservoirs for this disease. During a comparative health status surve...
Seropositivity and Risk Factors Associated with Toxoplasma gondii Infection in Wild Birds from Spain
Toxoplasma gondii is a zoonotic intracellular protozoan parasite of worldwide distribution that infects many species of warm-blooded animals, including birds. To date, there is scant information about the seropositivity of T. gondii and the risk factors associated with T. gondii infection in wild bird populations. In the present study, T. gondii infection was evaluated on sera obtained from 107...
پناهگاه حیات وحش موته با مساحت حدود 220000 هکتار در 95 کیلومتری شمال شهر اصفهان قرار دارد. در این پناهگاه، تعداد 511 گونه گیاه آوندی متعلق به 284 جنس و 59 تیره و 118 گونه جانور مهره دار متعلق به 85 جنس و 38 تیره یافت می شود. گونه های گیاهی نادر منطقه، بر پایه ی آخرین طبقه بندی iucn و با توجه به معیارهای مهم در دو رسته گونه های در معرض خطر انقراض، شامل: astragalus chaetopodus bunge., astragalus ...
Abstract Migratory connectivity describes the linkage between breeding and non-breeding sites, having major ecological implications in birds: one season influence success of an individual or a population following season. Most studies on migratory have used large-scale approaches, often considering regional populations, but fine-scale are also necessary to understand colony connectivity. The le...
Abstract Migration may expose individuals to a wide range of increasing anthropogenic threats. In addition direct mortality effects, this exposure influence post-migratory reproductive fitness. Partial migration—where population comprises migrants and residents—represents powerful opportunity explore carryover effects migration. Studies partial migration in birds typically examine short-distanc...
دلیجه کوچک (Falco naumanni) از پرندگان شکاری خانواده بازها (Falconidae) میباشد که معمولاً به صورت گروهی زندگی میکنند. به منظور بررسی جمعیت این دلیجه، ابتدا در استانهای تهران و گلستان، محلهای تجمع و کلونیهای زادآور این پرندگان مشخص و اندازه جمعیت آنها با استفاده از روش شمارش نقطهای (Point count) پرندگان بعد از یافتن آشیانهها (nest-finding) در بهار سالهای 86-1385 انجام شد. بر اساس نتایج ا...
Avian colony size variation is an evolutionary puzzle in terms of unequal fitness payoffs. We used a long-term marked lesser kestrel (Falco naumanni) population, where individual fitness increases with colony size, to test whether subordinates are evicted despotically from the largest colonies. Yearlings were smaller and lighter, were more attacked than expected, and lost most disputes over nes...
Avian coloniality traditionally has been investigated by examining how breeding success varies with colony size, but other crucial fitness components rarely have been examined. This may lead to wrong conclusions because unmeasured parameters may change the final fitness balance. We used multistate capture-recapture models to investigate adult survival and dispersal in relation to colony size wi...
Heterozygosity as a target of mate choice has received much attention in recent years and there is growing evidence supporting its role in the evolution of mate preferences. In this study we analyse mating patterns in relation to heterozygosity in a lesser kestrel (Falco naumanni) population intensively monitored over six study years (2002-2007). The magnitude of heterozygosity-based assortativ...
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