Siberian Stonechat (Saxicola maura) Science Article 1 abstract Long-distance migration is often associated with relatively short breeding seasons and a start of reproductive activities shortly after arrival. The full activation of the reproductive system from the regressed state takes, however, several weeks and must, therefore, be initiated in the winter quarters or during spring migration. […]
Category: Passeriformes
No evidence of genetic differentiation betweenlesser redpolls Carduelis flammea cabaret andcommon redpolls Carduelis f. flammea
Redpoll (Carduelis flammea) Science Article 1 abstract The remarkable variation in plumage and morphological characters in the redpoll complexCarduelis flammea-hornemanni has puzzled taxonomists for several decades. In contrast,molecular studies have not revealed any genetic differentiation among the phenotypic redpollforms. This could either be a result of high present-day gene flow or morphological differentiationfollowing a rapid […]
A pair of the Redpoll Carduelis flammea with two clutches in Finnmark, North Norway
Redpoll (Carduelis flammea) Science Article 2 abstract On 21 July 1999 I found, together with Per J. Tommeraas, a nest of the Redpoll Carduelis flammea with four eggs 4 m high up in a birch at Virdnejavvri in the Alta-Kautokeino water system in Finnmark, North Norway, north of the Arctic Polar Circle. The nest was […]
Ecological aspects of migration, and pre-migratory fat deposition in the lesser redpoll, Carduelis flammea cabaret
Redpoll (Carduelis flammea) Science Article 3 abstract This paper is a sequel to an earlier paper on the Lesser Redpoll (Evans 1966a), in which I discussed the timing of its annual (post-nuptial) molt in relation to the timing of breeding and autumn migration and described variations in the total weights of birds during late summer […]
The Rufous-Rumped Antwren (Terenura callinota) in Costa Rica
Rufous-rumped Antwren (Terenura callinota) Science Article 1 abstract Rufous-rumped Antwren (Terenura callinota) has a wide distribution from southern Middle America to Guyana and Peru, but is known chiefly from a handful of specimens from widely scattered localities. GARY STILES, Wilson Bulletin: Vol. 95, No. 3 Download article download full text (pdf)
Limited geographic variation in the vocalizations ofa neotropical furnariid, synallaxis albescens
Pale-breasted Spinetail (Synallaxis albescens) Science Article 1 abstract I recorded and analyzed vocalizations of Synallaxis albescens from three populations in Venezuela,two continental and one island, to assess the extent of geographic variation for a species of the familyFumariidae. Previous work on geographic variation in suboscines has focused on species of the Tyrannidae. Ialso tested the […]
Which method is most suitable for censusingbreeding populations of red-backed (Laniuscollurio) and great grey (L. excubitor) shrikes?
Northern Shrike (Lanius excubitor) Science Article 7 abstract Up to now, studies have shown that it is very difficult to estimate accurate numbers of shrike(Lanius spp) breeding pairs. During our shrike biology research in Western Poland this problemwas evident. Actual breeding pair numbers were derived from a combination of specialcounts in the pre-breeding period, intensive […]
Non-breeding site fidelity in northern shrikes
Northern Shrike (Lanius excubitor) Science Article 3 abstract Band-recovery data were examined for evidence of interseasonal non-breeding site fidelity in the Northern Shrike (Lanius excubitor), an irregular, long-distance migrant to the northern temperate zone. Despite the low rate of recapture (0.9%) of banded Northern Shrikes in subsequent years, recovery data revealed that 12 individuals were […]
Food consumption and roosting behaviour of Great Grey Shrikes Lanius excubitor wintering in south-western Finland.
Northern Shrike (Lanius excubitor) Science Article 10 abstract For diurnal predators the short time of winter daylight may limit the possibilities to feed and hunt. In this field study, these aspects, as well as roosting behaviour,were evaluated in wild Great Grey Shrikes (Lanius e. excubitor). The main roost-sites were large junipers (Juniperus communis) and willows […]
Animals of different phenotype differentially utilise dietary niche-the case of the Great Grey Shrike Lanius excubitor
Northern Shrike (Lanius excubitor) Science Article 9 abstract We tested the morphological trait utility in Great Grey Shrike Lanius excubitor. The food composition was used as an indicator of phenotype performance advantage in utilising of particular dietary niche. Mounts and accompanying data (measurements and stomach contents) from the Slovak extensive collection, involving adult birds obtained […]