Garden Warbler (Sylvia borin) Science Article 3 abstract The Garden Warbler is a classic subject for the study of Palaearctic
Category: Passeriformes
Fat reserves and moult-migration overlap in goldcrests, Regulus regulus-A trade-off?
Goldcrest (Regulus regulus) Science Article 1 abstract Moult and migration are both recognised as highly energy-demanding activities of birds. I studied moult-migration overlap in migrating goldcrests Regulus regulus to see whether birds might be trading these activities off against each other. I found that in both sexes the size of subcutaneous fat reserves were greater […]
RECENT EVOLUTIONARY HISTORY OF THEFOX SPARROWS (GENUS: PASSERELLA)
Fox Sparrow (Passerella iliaca) Science Article 1 abstract On the basis of plumage coloration and mitochondrial DNA variation, four maingroups are recognized within the Fox Sparrow (Passerella iliaca): the red group (iliaca, RE),sooty group (unalaschcensis, SO), thick-billed (megarhyncha, TB), and slate-colored (schistacea,SC). To establish phylogenetic relationships among those four groups, we analyzed 2119 basepairs of […]
THE SUBSPECIES OF HESPERIPHONA VESPERTINA
Evening Grosbeak (Hesperiphona vespertina) Science Article 1 abstract The writer’s attention was first called to the systematic status of the Evening Grosbeaks of western North America by Mr. Allan Brooks who stated in a letter that he had found certain peculiarities in his series gathered in British Columbia. JOSEPH GRINNELL, THE CONDOR Vol. 19, 1917 […]
WINTER SURVEY DATA REVEAL RANGEWIDE DECLINE IN EVENINGGROSBEAK POPULATIONS
Evening Grosbeak (Hesperiphona vespertina) Science Article 3 abstract Once one of the most common species seen at bird feeding stations across much of North America in winter, the Evening Grosbeak (Coccothraustes vespertinus), appears to be experiencing a population decline. Like other finches associatedwith the boreal forest or high elevations, Evening Grosbeaks form flocks in winter, […]
Juvenal plumage of the Evening Grosbeak
Evening Grosbeak (Hesperiphona vespertina) Science Article 2 abstract All the authorities that have dealt with the plumages of the Evening Grosbeak have described the juveniles of both sexes as resembling the adult female. Allan Brooks, The AUK vol. 56, 1939 Download article download full text (pdf)
Fluctuations related to rainfall in richness and abundance of birds of steppic Mediterranean habitats
Fan-tailed Warbler (Cisticola juncidis) Science Article 1 abstract The existence of interannual variations in the richness and abundance of bird species breeding in pseudo-steppic Mediterranean areas is analysed and related to the important fluctuations that take place in rainfall, which in turn deeply influence vegetation growth. The hypothesis of food limitation as a key factor […]
Nest defence strategies in the Fieldfare Turdus pilaris: the responses on an avian and a mammalian predator.
Fieldfare (Turdus pilaris) Science Article 1 abstract The Fieldfare Turdus pilaris, a medium-sized passerine, is aggressive in nest defence and its use of f ces may be detrimental to avian but not to mammalian predators. The birds breed either solitarily or in colonies, the nesting pattern in subalpine forests is apparently dependent on the abundance […]
Colonial and single breeding in fieldfares, Turdus pilaris L.:a comparison of nesting success in early and late broods
Fieldfare (Turdus pilaris) Science Article 2 abstract Pairs of fieldfares breed singly or in colonies. Their breeding season was subdivided into an early part, when the trees were still leafless, and a late part, when the trees had leaves. Early colonial pairs had a significantly higher nesting success than single pairs. However, amongst late broods […]
Unusual bathing behavior of the Fork-tailed Flycatcher in Colombia
Fork-tailed Flycatcher (Tyrannus savana) Science Article 1 abstract While conducting a crocodile (Crocorlylus sp.) census along the Tomo River, Vichada, Colombia, I observed Fork-tailed Flycatchers (Tyrarznus savana) engaged in unusual group behavior. Six birds were perched 10 m up in a dead tree at water’s edge on the south bank of the river. The birds […]