| occurrence of leucocytozoon and haemoproteus (apicomplexa, haemosporina) in falconiformes and strigiformes of italy. | blood smears from falconiformes (91 birds of 10 species) and strigiformes (23 birds of 5 species) captured in italy, were examined for haematozoa. leucocytozoon were found in falco tinnuculus, buteo buteo, circus cyaneus, circus pygargus, accipiter nisus from falconiformes and in strix aluco, from strigiformes. haemoproteus were found in falco tinnuculus and strix aluco; this latter species harbored mixed infections leucocytozoon-haemoproteus. prevalences were 20.80% in falconiformes and 21.74% ... | 1984 | 6431891 |
| [parasites of austrian birds of prey (falconiformes)]. | during the examination of 158 birds of prey -- buteo buteo (85), falco tinnunculus (30), accipiter gentilis (19), accipiter nisus (18), circus aeruginosus (2), circus pygargus (1), pandion haliaetus (1), pernis apivorus (1), falco subbuteo (1) and faeces samples of falco tinnunculus 4 protozoan species, 1 trematode species, 2 cestode species, 13 nematode species, 2 acanthocephalan species and 5 mallophaga species could be detected. in the buzzard, kestrel and goshawk a new species of capillaria ... | 1980 | 7212374 |
| helminth fauna of falconiform and strigiform birds of prey in galicia, northwest spain. | this is a survey of the helminth fauna of 285 individuals of 14 species of birds of prey (falconiformes and strigiformes) from galicia (northwest spain), namely buteo buteo, accipiter nisus, a. gentilis, milvus migrans, m. milvus, pernis apivorus, circus pygargus, falco tinnunculus, f. peregrinus, f. subbuteo, tyto alba, strix aluco, asio otus and athene noctua. a total of 15 helminth species were detected, namely 8 nematodes ( eucoleus dispar, capillaria tenuissima, synhimantus laticeps, microt ... | 2004 | 14714181 |
| a conceptual model for assessing risks in a mediterranean natura 2000 network site. | every year millions of tons of chemical products are disposed to the environment as a result of human activities, with deleterious consequences to biodiversity. in europe the biodiversity policy basis for action is provided by the birds and the habitats directives. according to these directives a network of protected areas is being built across eu countries encompassing the natura 2000 network. but the management plans of these protected areas do not require an ecotoxicological assessment of che ... | 2009 | 18990432 |
| carotenoids in nestling montagu's harriers: variations according to age, sex, body condition and evidence for diet-related limitations. | carotenoids are colored pigments forming the basis of many avian social traits. before their utilization carotenoids must be acquired through diet and mobilized for specific uses. the relationships between carotenoid-based coloration, circulating carotenoids and body condition have been well studied in adult birds, but little is known in nestlings. here, we investigated variations in carotenoid-based coloration in a raptor nestling, the montagu's harrier (circus pygargus), both in captivity and ... | 2010 | 19575207 |
| Demographic history, genetic structure and gene flow in a steppe-associated raptor species. | ABSTRACT: | 2011 | 22093489 |
| permanent genetic resources added to molecular ecology resources database 1 june 2011-31 july 2011. | this article documents the addition of 112 microsatellite marker loci and 24 pairs of single nucleotide polymorphism (snp) sequencing primers to the molecular ecology resources database. loci were developed for the following species: agelaius phoeniceus, austrolittorina cincta, circus cyaneus, circus macrourus, circus pygargus, cryptocoryne × purpurea ridl. nothovar. purpurea, mya arenaria, patagioenas squamosa, prochilodus mariae, scylla serrata and scytalopus speluncae. these loci were cross-t ... | 2011 | 21951598 |
| 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 1079 wild birds belonging to 56 species (including falconiformes (n = 610), strigiformes (n = 260), ciconi ... | 2011 | 22216311 |
| monitoring of west nile virus, usutu virus and meaban virus in waterfowl used as decoys and wild raptors in southern spain. | in the last decade, the number of emerging flaviviruses described worldwide has increased considerably, with wild birds acting as the main reservoir hosts of these viruses. we carried out an epidemiological survey to determine the seroprevalence of antigenically related flaviviruses, particularly west nile virus (wnv), usutu virus (usuv) and meaban virus (mbv), in waterfowl used as decoys and wild raptors in andalusia (southern spain), the region considered to have the highest risk of flavivirus ... | 2016 | 27865265 |
| measuring oxidative stress: the confounding effect of lipid concentration in measures of lipid peroxidation. | lipid peroxidation products are widely used as markers of oxidative damage in the organism. to properly interpret the information provided by these markers, it is necessary to know potential sources of bias and control confounding factors. here, we investigated the relationship between two indicators of lipid mobilization (circulating levels of triglycerides and cholesterol) and two common markers of oxidative damage (plasma levels of malondialdehyde and hydroperoxides; the latter estimated from ... | 2015 | 25860832 |
| how individual montagu's harriers cope with moreau's paradox during the sahelian winter. | hundreds of millions of afro-palaearctic migrants winter in the sahel, a semi-arid belt south of the sahara desert, where they experience deteriorating ecological conditions during their overwintering stay and have to prepare for spring migration when conditions are worst. this well-known phenomenon was first described by r.e. moreau and is known ever since as moreau's paradox. however, empirical evidence of the deteriorating seasonal ecological conditions is limited and little is known on how b ... | 2016 | 27642032 |
| identifying effective actions to guide volunteer-based and nationwide conservation efforts for a ground-nesting farmland bird. | 1. modern farming practices threaten wildlife in different ways, and failure to identify the complexity of multiple threats acting in synergy may result in ineffective management. to protect ground-nesting birds in farmland, monitoring and mitigating impacts of mechanical harvesting is crucial. 2. here, we use 6 years of data from a nationwide volunteer-based monitoring scheme of the montagu's harrier, a ground-nesting raptor, in french farmlands. we assess the effectiveness of alternative nest ... | 2015 | 26361397 |
| migratory connectivity and population-specific migration routes in a long-distance migratory bird. | knowledge about migratory connectivity, the degree to which individuals from the same breeding site migrate to the same wintering site, is essential to understand processes affecting populations of migrants throughout the annual cycle. here, we study the migration system of a long-distance migratory bird, the montagu's harrier circus pygargus, by tracking individuals from different breeding populations throughout northern europe. we identified three main migration routes towards wintering areas ... | 2014 | 24430850 |
| a palaearctic migratory raptor species tracks shifting prey availability within its wintering range in the sahel. | mid-winter movements of up to several hundreds of kilometres are typical for many migratory bird species wintering in africa. unpredictable temporary food concentrations are thought to result in random movements of such birds, whereas resightings and recoveries of marked birds suggest some degree of site fidelity. only detailed (e.g. satellite) tracking of individual migrants can reveal the relative importance and the causes of site choice flexibility and fidelity. the present study investigates ... | 2013 | 23137184 |
| blood chemistry and hematologic values in free-living nestlings of montagu's harriers (circus pygargus) in a natural habitat. | the establishment of reference intervals for hematologic and blood chemistry values in a given species is essential for subsequent diagnosis of disease at rehabilitation facilities and in captive breeding programs. in this study, blood samples were obtained from nestlings (18 males and 22 females) of a natural-vegetation breeding population of montagu's harrier (circus pygargus) in eastern spain in order to establish reference intervals for blood values. this is the first study documenting hemat ... | 2009 | 20063815 |
| ultraviolet reflectance by the cere of raptors. | ultraviolet (uv) signals have been shown to play key roles in social and sexual signalling in birds. using a spectrophotometer, we analysed the colour of the cere (skin above the beak) of a diurnal raptor, the montagu's harrier (circus pygargus), and show that it reflects in the uv part of the spectrum. the cere is a well-known sexual signal in raptors, with carotenoid based pigmentation being indicative of quality. we thus hypothesized that uv reflectance also signals quality. accordingly, we f ... | 2006 | 17148356 |
| density-dependent regulation of population size in colonial breeders: allee and buffer effects in the migratory montagu's harrier. | expanding populations offer an opportunity to uncover the processes driving spatial variation in distribution and abundance. individual settlement decisions will be influenced by the availability and relative quality of patches, and by how these respond to changes in conspecific density. for example, conspecific presence can alter patch suitability through reductions in resource availability or territorial exclusion, leading to buffer effect patterns of disproportionate population expansion into ... | 2006 | 16794831 |
| [a hawk (circus pygargus) carries its young into the nest]. | | 1966 | 5994892 |
| a circannual perspective on daily and total flight distances in a long-distance migratory raptor, the montagu's harrier, circus pygargus. | long-distance migrants are particularly recognized for the distances covered on migration, yet little is known about the distances they cover during the rest of the year. gps-tracks of 29 montagu's harriers from breeding areas in france, the netherlands and denmark showed that harriers fly between 35 653 and 88 049 km yr(-1), of which on average only 28.5% is on migration. mean daily distances during migration were 296 km d(-1) in autumn and 252 km d(-1) in spring. surprisingly, males' daily dis ... | 2017 | 28615350 |
| fine-scale genetic structure in a high dispersal capacity raptor, the montagu's harrier (circus pygargus), revealed by a set of novel microsatellite loci. | the montagu's harrier (circus pygargus) is a semi-colonial raptor species widely but patchily distributed across the palearctic region with recorded cases of philopatry and presence of extra-pair copulation. in order to assess montagu's harrier spatial genetic structure and contemporary gene flow, we developed 16 new microsatellite markers using 454 pyrosequencing. genotypes of 117 chicks sampled in a 200 × 300 km farmland area in central western france were analyzed to characterize genetic poly ... | 2019 | 30671744 |
| blood concentrations of p,p'-dde and pcbs in harriers breeding in spain and kazakhstan. | organochlorine compounds (oc) are of interest in current biomonitoring studies because of their well-known persistence, accumulation capacity and the adverse effects they caused in the past. p,p'-dde has been shown to cause severe reproductive failures and population declines in birds of prey. however, there are knowledge gaps regarding oc exposure for some species (e.g. harriers), the historical record and the broader picture. the main goal was to evaluate exposure to p,p'-dde and pcbs in two r ... | 2018 | 29929241 |