Tree Swallow (Tachycineta bicolor) Science Article 1 abstract Females, and not males, have delayed plumage maturation. The hypothesis that plumage differences are the result of differences in competitive abilities among individualsis tested by comparing brown and blue Tree Swallow females in terms of foraging abilities, as determined by the growth of nestlings under their care […]
Category: Passeriformes
Experimental heating reveals nest temperature affects nestling condition in tree swallows(Tachycineta bicolor)
Tree Swallow (Tachycineta bicolor) Science Article 10 abstract Investment in one life-history stage can have delayed effects on subsequent life-history stages within a single reproductive bout. We experimentally heated tree swallow (Tachycineta bicolor) nests during incubation to test for effects on parental and nestling conditions. Females incubating in heated boxes maintained higher body condition and […]
Sex Ratios of Fleas (Siphonaptera: Ceratophyllidae) in Nests of TreeSwallows (Passeriformes: Hirundinidae) Exposed toDifferent Chemicals
Tree Swallow (Tachycineta bicolor) Science Article 5 abstract Endocrine disruptors have well-known effects on vertebrate population sex ratios, buta variety of chemicals can also affect sex ratios of invertebrates. We tested whether sex ratios of
UNSUITABILITY OF TREE SWALLOWS AS HOSTS TO BROWN-HEADED COWBIRDS
Tree Swallow (Tachycineta bicolor) Science Article 9 abstract Swallows are parasitized rarely by Brown-headed Cowbirds (Molothrus ater). I added cowbird eggs to 15 Tree Swallow (Tachycineta bicolor) nests. One egg disappeared and seven failed to hatch whereas 63 of 66 host eggs hatched. The seven cowbird hatchlings died in 3-12 (mean = 6.3) d, whereas […]
Laying order, hatching asynchrony and nestling body mass in TreeSwallows Tachycineta bicolor
Tree Swallow (Tachycineta bicolor) Science Article 6 abstract We studied the reproductive biology of a box-nesting population of Tree SwallowsTachycineta bicolor in southeastern Wisconsin, USA. We were interested particularlyin the relationship between laying order and hatching order and the extent to whicheach was a predictor of nestling body mass. We found that laying order was […]
Nightjar Caprimulgus europaeus and Woodlark Lullula arborea – recovering species in Britain?
Tree Pipit (Anthus trivialis) Science Article 2 abstract The Nightjar Caprimulgus europaeus and Woodlark Lullula arborea are identified as species of conservation concern at both a UK and a European level on account of historical declines in their population sizes and ranges. The UK populations of both species have increased significantly in recent decades and […]
Fitness consequences of hybridization between house sparrows( Passer domesticus) and tree sparrows ( P. montanus)
Tree Sparrow (Passer montanus) Science Article 2 abstract Gene transfer may occur following hybridization between closely related species if hybrids are viable and able to breed with individuals of one or both of the parental species. House (Passer domesticus) and tree sparrows (P. montanus) occasionally hybridize and produce viable o.spring. Previously, we concluded that male […]
Reproductive effort of colonialand solitary breeding tree sparrows Passer montanus L.
Tree Sparrow (Passer montanus) Science Article 1 abstract A total of 250 nestboxes were arranged in five plots in a suburban area of Budapest, Hungary (19 deg 04’E, 47 deg 41’N). In each plot, 25 were placed at 50 m intervals to simulate solitary breeding and 25 3-5 m apart to simulate colonial breeding. Length […]
Population increase and aspects of colonization of the Tree Sparrow Passer montanus in the agricultural landscapes of southern Finland
Tree Sparrow (Passer montanus) Science Article 5 abstract While many farmland bird species are declining in Western Europe, the Finnish Tree Sparrow Passer montanus population has increased significantly during recent decades. During 1984-2002, we studied the population changes, colonization characteristics and nest sites of theTree Sparrowin a large area of agricultural landscapewithin southern Finland. The […]
Tree Sparrow Passer montanus freezing in the presence of a Sparrowhawk Accipiter nisus
Tree Sparrow (Passer montanus) Science Article 3 abstract [..] A striking example of freezing behaviour in Tree Sparrows Passer montanus was observed at Tovetorp Zoological Research Station in south-eastern Sweden on 28 February 2002. I observed a Sparrowhawk Accipiter nisus launching an attack, at 14.45 in the afternoon, towards a feeding station located underneath a […]