Category: Passeridae

Impaired hatching success and male-biased embryo mortality in Tree Sparrows

Tree Sparrow (Passer montanus) Science Article 4 abstract During the past 30 years, many species of farmland birds have declined dramatically in numbers in Northern Europe, a trend coinciding with a tremendous intensification of agriculture, although the exact causes of these declines remain unclear. One of the worst affected species is the Tree Sparrow (Passer […]

Spring temperatures and laying dates of first eggs of three passerines in Croatia

Tree Sparrow (Passer montanus) Science Article 7 abstract This study is based on the spring temperaturesand laying dates of first eggs of threepasserines (sedentary: Great Tit, Parus majorand Tree Sparrow, Passer montanus; migratory:Starling, Sturnus vulgaris). Laying datesof first eggs were used as estimates of timingof breeding. The term ‘laying date’ is definedas the date of […]

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 […]