Siskin (Carduelis spinus) Science Article 1 abstract Annual population abundances from 1992 to 2002 of Siskins Carduelis spinus, CommonCrossbills Loxia curvirostra and Citril Finches Carduelis citrinella were studied in relationto flowering intensity of spruce Picea abies.We used point countmethod to study thechanges in abundance of the three species in the Northern Black Forest (southwest Germany).Our […]
Category: Passeriformes
The impact of grazing animals on nesting success of grassland passerines in farmland and natural habitats: a field experiment
Sky Lark (Alauda arvensis) Science Article 4 abstract A study was made of the influence of trampling by grazing animals on the nesting success of real nests (meadow pipit, Anthus pratensis; water pipit, Anthus spinoletta; and skylark, Alauda arvensis) and simulated nests (caps from jam-jars filled by green plasticine) on pasture in the Orlicke Mountains […]
Parasitism by Shiny Cowbirds of Rufous-Bellied Thrushes
Shiny Cowbird (Molothrus bonariensis) Science Article 1 abstract I studied the interaction between a brood parasite, the Shiny Cowbird (Molothrusbonariensis), and a large host, the Rufous-bellied Thrush (Turdus rujventris), in the Pampas Region of Argentina. Shiny Cowbird eggs were observed in 34 out of 70 (48.6%) thrush nests throughout the host’s breeding season. The main […]
Feeding associations between capybaras Hydrochoerus hydrochaeris (Linnaeus) (Mammalia, Hydrochaeridae) and birds in the Lami Biological Reserve, Porto Alegre, Rio Grande do Sul, Brazil.
Shiny Cowbird (Molothrus bonariensis) Science Article 7 abstract Feeding associations between capybaras Hydrochoerus hydrochaeris (Linnaeus, 1766) and some bird species were registered in the Lami Biological Reserve, southern Brazil, through observations in a set of transects established in the five major vegetation types of the study area: shrubby and herbaceous swamps, wet grasslands, sandy grasslands […]
Conirostrum bicolor Parasitized by Molothrus bonariensis in Surinam
Shiny Cowbird (Molothrus bonariensis) Science Article 3 abstract Hellmayr (Field Mus. Nat. Hist. Publ. 347, Zoo1. Set. vol 13, 1935, p. 319) includes Surinam in the range of Conirostrum bicolor on evidence of the Penard brothers (Vogels van Guyana, 2, 1910, p. 475), though he mentions no specimens nor localities. In Surinam, as elsewhere in […]
Phylogenetic analysis of life-history adaptationsin parasitic cowbirds
Shiny Cowbird (Molothrus bonariensis) Science Article 2 abstract Parasitic cowbirds lay eggs in the nests of other species and dupe them into caring for their young. Unlike other brood parasites,cowbirds have not developed egg mimicry or bizarre chick morphology. However, most of them parasitize a large number ofhosts. Several features of cowbirds have been proposed […]
Parental body mass changes during the nestingstage in two Lark species in a semi-arid habitat
Short-toed Lark (Calandrella brachydactyla) Science Article 1 abstract Parental body mass changes during the nesting period were analysed for Thekla Larks,Galerida theklae, and Lesser Short-toed Larks, Calandrella rufescens. Body mass of femaleThekla Larks declines from the start of incubation until the chicks fledge; laying date,interpreted as the number of renesting attempts, also has a negative […]
Seasonal and interannual variability in laying date, clutch size, egg volume and hatching asynchrony of four lark species in Mediterranean Spain
Short-toed Lark (Calandrella brachydactyla) Science Article 2 abstract To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrella rufescens) and at two different time scales: between years (large-scale variation), and within […]
Are foraging Serin Serinus serinus females more vigilant than males? The effect of sex ratio.
Serin (Serinus serinus) Science Article 2 abstract Given that in many bird species females are subordinate to males and that, in general, subordinate individuals are more vigilant than dominants ones, we should predict foraging females to be more vigilant than males. This prediction is tested here in flocks of Serins Serinus serinus, where several males […]
THE RUFOUS-COLLARED SPARROW AS A HOST OF THE SHINY COWBIRD
Shiny Cowbird (Molothrus bonariensis) Science Article 5 abstract The Rufous-collared Sparrow or Chingolo (Zonotrichia cupensis) is one of the main hosts of the Shiny Cowbird (Molothrus bonariensis) through most of their overlapping range in South America. The most recent study on the interaction between these species was carried out by King (1973) in Horco Molle, […]