Grey-headed Kite (Leptodon cayanensis) Science Article 1 abstract The Gray-headed Kite (Leptodon cayanensis), a little-known Neotropical raptor (Blake 1977, Brown and Amadon 1989, de1 Hoyo et al. 1994); occurs in lowland tropical forests from central-eastern Mexico to northern Argentina (Brown and Amadon 1989). Only one nest and two clutches of the species have been described […]
The nest and eggs of Tolmomyias poliocephalus
Grey-crowned Flycatcher (Tolmomyias poliocephalus) Science Article 1 abstract The tropical New World flycatchers of the genus Tolnzomyias are small and dull colored, resembling somewhat those of the much better known and more northward ranging genus Enzpidonaz. They are, however, rather heavy-hilled, in this respect resembling the species of RhynchocyclztsH. ellmayr (1927. Cat. Birds of the […]
AUTUMN MIGRATION OF GRAY-CHEEKED AND BICKNELL’S THRUSHES AT KIPTOPEKE, VIRGINIA
Grey-cheeked Thrush (Catharus minimus) Science Article 1 abstract We examined the magnitude and timing of autumn migration for the Graycheeked-Bicknell’s Thrush complex using banding data collected during 27 autumn seasons at Kiptopeke, Virginia. MICHaeL D. WILSON AND BRYAN D. WATTS, J. Field Ornithol., 68(4):519-525 Download article download full text (pdf)
The Status of Gray-cheeked Thrush (Catharus minimus) in Newfoundland and Labrador
Grey-cheeked Thrush (Catharus minimus) Science Article 2 abstract Gray-cheeked Thrush and Bicknell’s Thrush were once considered to be conspecific (AOU 1957). Recently, they have been split into two distinct species (AOU 1998) – Bicknell’s Thrush (C. bicknelli), breeding in the Maritime provinces and New England, and Gray-cheeked Thrush, breeding in Newfoundland, the Labrador Peninsula, and […]
THE GRAY-BREASTED CRAKE (LATERALLUS EXILIS) IN COSTA RICA: VOCALIZATIONS, DISTRIBUTION, ANDINTERACTIONS WITH WHITE-THROATED CRAKES (L. ALBIGULARIS)
Grey-breasted Crake (Laterallus exilis) Science Article 1 abstract We provide the first documentation ofLaterallus exilis in Costa Rica. Because of its secretive nature, little is known about this species. We describe the coloration of itssoft parts and contrast its vocalizations with those of L. albigularis, a common and sympatric congener. In Costa Rica, L. exilis […]
Effects of parental effort on second brood, moult and survival in the Grey Wagtail Motacilla cinerea
Grey Wagtail (Motacilla cinerea) Science Article 1 abstract Negative effects of current reproductive effort on components of future reproduction, called the cost of reproduction’, have been shown experimentally in a wide range of avian species . A possible mechanism for the mediation of these costs between successive breeding se as ons may be the impairment […]
Grey partridge Perdix perdix population status in central northern France: spatial variability in density and 1994-2004 trend
Grey Partridge (Perdix perdix) Science Article 2 abstract The grey partridge Perdix perdix is an important management concern in the European farmland. Pair numbers severely declined during the 20th century. As a result, the species has been listed in SPEC category 3, i.e. ‘Unfavourable’ conservation status in Europe. The largest population of western Europe occurs […]
Finnish native grey partridge (Perdix perdix) population differs clearly in mitochondrial DNA from the farm stock used for releases.
Grey Partridge (Perdix perdix) Science Article 1 abstract The mitochondrial DNA (mtDNA) control region I (CR1) of 138 wild and 36 captive grey partridges (Perdix perdix) was sequenced. Representing two major mitochondrial DNA lineages that differed by 15 nucleotide substitutions (3.7%), the Finnish lineage dominated in the wild, whereas the European lineage dominated in the […]
The diet and disease susceptibility of grey partridges Perdix perdix on arable farmland in East Anglia, England
Grey Partridge (Perdix perdix) Science Article 3 abstract A three-year field-based study of 85 radio-tagged female wild grey partridges Perdix perdix was undertaken during 200 -2003 in East Anglia, England, to investigate possible links between chick diet and parasite-induced disease. The females produced 30 broods, whose diet measured by f cal analysis was typical of […]
Extra-pair copulations of Grey Herons nesting at high densities
Grey Heron (Ardea cinerea) Science Article 2 abstract The copulatory behaviour of Grey Heron Ardea cinerea was observed in a colony in Donana (SW Spain) during two years. A total of 262 pair copulation attempts (PCAs) and 39 extra-pair copulation attempts (EPCAs) (12.9% of all copulation attempts) were observed among 31 focal pairs. 84% of […]