Crag Martin (Ptyonoprogne rupestris) Science Article 1 abstract From 1994 to 1999, we investigated how climatic conditions influence the laying dates and number of fledged young of the Crag Martin Ptyonoprogne rupestris, a poorly studied colonial martin that, like other aerial feeding birds, is supposed to be highly dependent on weather conditions. Laying dates were […]
Category: Passeriformes
Sexing Corn Buntings Miliaria calandra by discriminant function: a reply
Corn Bunting (Emberiza calandra) Science Article 4 abstract Although, as Morgan (2006) points out, we cannot reject a systematic observer-associated error of 10 mm, we suggest that the existence of some female Corn Buntings (n = 5) with longer wing lengths than described in literature (Cramp & Perrins 1994) and the lack of a normal […]
Sex differentiation of Corn Buntings Miliaria calandra wintering in northern Spain
Corn Bunting (Emberiza calandra) Science Article 1 abstract A discriminant function was developed for sex differentiation of Corn Buntings Miliaria calandra wintering in northern Spain. The function, y = 0.136A + 0.288W-26.837, where A is wing length in mm and W is body weight in g, gives positive values for males and negative values for […]
Sexing Corn Buntings Miliaria calandra by discriminant function: a comment
Corn Bunting (Emberiza calandra) Science Article 3 abstract A recent paper on sexing Corn Buntings Miliaria calandra by discriminant function (Campos et al 2005) quotes wing lengths exceeding 100 mm for five of 51 females sexed by molecular methods. The occurrence of wings this long is noted by the authors as unusual, whereas they are […]
De Grauwe Gors Miliaria calandra: recente aantalsontwikkeling, habitatkeus en perspectieven in relatie tot het beheer van uiterwaarden en akkerland
Corn Bunting (Emberiza calandra) Science Article 2 abstract De Grauwe Gors dreigt uit Nederland te verdwijnen. Ook in de laatste bolwerken in Limburg en de uiterwaarden van de Waal ziet de situatie er voor deze karakteristieke soort niet rooskleurig uit. Een nauwkeurige blik op de lokale aantalontwikkelingen en veranderingen in de beschikbare broed- en winterhabitat […]
Fluctuations related to rainfall in richness and abundance of birds of steppic Mediterranean habitats
Corn Bunting (Emberiza calandra) Science Article 5 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 […]
The duration of parental care in the Common Tody Flycatcher
Common Tody-Flycatcher (Todirostrum cinereum) Science Article 1 abstract The nesting habits of the Common Tody Flycatcher (Todirostrum cinereum)are now well known. Skutch (1930,Auk 47:313-322;1960, Pacific Coast Avifauna 34: 475-489) published two detailed life histories of the race finitimum in Panama and Costa Rica, and I (Haverschmidt 1968, Birds of Surinam, Edinburgh, Oliver and Boyd, p. […]
Male mask size is correlated with mating success in the commonyellowthroat
Common Yellowthroat (Geothlypis trichas) Science Article 2 abstract Many socially monogamous species have sexually dimorphic traits. The evolution of these traits is puzzling as sexual selection is often thought to be relatively weak in monogamous species KEVIN J. THUSIUS et al., ANIMAL BEHAVIOUR, 2001, 62, 435-446 Download article download full text (pdf)
Dual functions of a melanin-based ornamentin the common yellowthroat
Common Yellowthroat (Geothlypis trichas) Science Article 1 abstract Melanin-based ornaments often function as signals in male-male competition, whereas carotenoid-based ornaments appear to be important in female mate choice. This difference in function is thought to occur because carotenoid pigments are more costly to produce than melanins and are thus more reliable indicators of male quality. […]
The evolutionary history of Eurasian redstarts, Phoenicurus
Common Redstart (Phoenicurus phoenicurus) Science Article 2 abstract The bird genus Phoenicurus comprises 10 to 11 species that occur from Europe through Asia. To resolve theirphylogenetic relationships, their phylogeography and the tempo of their evolution, the mitochondrial cytochrome-b gene wassequenced for 16 taxa. The Bayesian maximum likelihood tree and neighbor-joining dendrogram computed from the resultingdata […]