Lesser Grey Shrike (Lanius minor) Science Article 1 abstract Modem agriculture contributed to the decline of many bird species through habitat degradation or habitat loss during the second half of the 20th century in western Europe. Areas where traditional agriculture has been maintained still allow many species to breed and survive, some of them now […]
Category: Passeriformes
BEHAVIOR OF THE GRASSLAND SPARROW AND TWO SPECIES OF SEED-FINCHES
Large-billed Seed-Finch (Oryzoborus crassirostris) Science Article 1 abstract The behavior of many of the predominantly granivorous neotropical bird species cOnventionally grouped under the familial heading Fringillidae in field guides is poorly known. Documenting it may help promote a better understanding of the phylogeny and Systematics of these birds and clarify the evolution and adaptive significance […]
THE EFFECTS OF PATCH SHAPE ON INDIGO BUNTINGS: EVIDENCE FOR AN ECOLOGICAL TRAP
Indigo Bunting (Passerina cyanea) Science Article 1 abstract Habitat loss and fragmentation have led to a widespread increase in the proportion of edge habitat in the landscape. Disturbance-dependent bird species are widely assumed to benefit from these edges. However, anthropogenic edges may concentrate nest predators while retaining habitat cues that birds use to select breeding […]
MIGRATORY FEATURES OF THE INDIGO BUNTING IN JAMAICA AND FLORIDA
Indigo Bunting (Passerina cyanea) Science Article 5 abstract Recent years have seen the accumulation of many useful quan- titative and qualitative data pertaining to weight and fat in migratory birds. Most investigations of this nature have thus far dealt with birds breeding and overwintering on north temperate land masses, but few quantitative data pertaining to […]
Replaced primaries in first nuptial plumage of Passerina cyanea.
Indigo Bunting (Passerina cyanea) Science Article 3 abstract Dwight pointed out (1900, p. 211 et seq.) long ago that the Indigo Bunting replacessome outer primaries at the postjuvenal molt. These replaced primaries (in the male) have blue outer vanes contrasting sharply with the blackish outer vanes of the juvenal primaries, except that primary 9 has […]
A NEW HYBRID BUNTING (PASSERINA CYANEA x PASSERINA CIRIS)
Indigo Bunting (Passerina cyanea) Science Article 2 abstract FOUR buntings of the genus Passerina breed in the United States: Indigo (P. cyanea), Lazuli (P. amoena), Varied (P. versicolor), and Painted (P. ciris). WALTER KINGSLEY TAYLOR, The Auk 91: 485-487. July 1974 Download article download full text (pdf)
Male Parental Care and Extrapair Copulations in the Indigo Bunting
Indigo Bunting (Passerina cyanea) Science Article 6 abstract Levels of parental care by male Indigo Buntings (Passerina cyanea) were predicted to be lower and the tendency to pursue extrapair matings greater when (1) the opportunity of additional matings (extrapair copulations) was high, (2) the male was cuckolded, and (3) the clutch or brood size was […]
Within-clutch repeatability of egg dimensions in the jackdaw Corvus monedula: a study based on a museum collection
Jackdaw (Coloeus monedula) Science Article 2 abstract Variation in size and shape of the jackdaw (Corvus monedula) eggs was studiedon egg’s museum collection data from Bardejov region, NE Slovakia, from1961 to 1964. Mean clutch size was 4.14 1.29 (n = 125). Coecients of variationfor clutch means ranged from 1.67 (breadth) to 4.85 (volume). Meanrepeatability […]
Gliding flight in a jackdaw: a wind tunnel study
Jackdaw (Coloeus monedula) Science Article 1 abstract We examined the gliding flight performance of a jackdaw Corvus monedula in a wind tunnel. The jackdaw was able to glide steadily at speeds between 6 and 11ms?1. The bird changed its wingspan and wing area over this speed range, and we measured the so-called glide superpolar, which […]
Widespread local house-sparrow extinctions
House Sparrow (Passer domesticus) Science Article 3 abstract Agricultural intensification is blamed for the plummeting populations of these birds. Ian J. Deary, Martha C. Whiteman, Alison Pattie, John M. Starr, Caroline Hayward