Tag: all of Parus

Size and parental effort in the Great Tit Parus major.

Great Tit (Parus major) Science Article 19 abstract We experimentally reduced clutch size of Great Tits Parus major to investigate the effects on parental care (including Daily Energy Expenditure, DEE, measured with doubly labelled water). and the relationship between DEE and the residual reproductive value. The length of a working day was not affected. but […]

Information, predation risk and foraging decisions during mobbing in great tits Parus major

Great Tit (Parus major) Science Article 26 abstract Tomaximise survival during foraging animalsmust decide when and for how long foraging should be interrupted in order to avoid predators. Previous experiments have shown that birds that hear other individuals’alarm calls resume feeding later than those that see a flying predator.However, the responses of prey animals to […]

Maternal yolk testosterone does not modulate parasite susceptibility or immune function in great tit nestlings

Great Tit (Parus major) Science Article 31 abstract Maternal yolk hormones can enhance the development and phenotypic quality of nestling birds. Nevertheless, within species large differences in yolk androgen concentrations among clutches are observed. This differential allocation of maternal yolk hormones might be explained by a trade-off between beneficial effects of yolk androgens and their […]

Delays of the hatching dates in Great Tits Parus major: Effects on breeding performance

Great Tit (Parus major) Science Article 21 abstract The effects of delays of hatching date, caused by temporary interruptions or lengthening of breeding activities such as nest building, laying or incubation, on several fitness-related components were studied in a Great Tit Parus major population in eastern Spain. Hatching delays were relatively more frequent during an […]

The effects of trapping on the perception, and trade-off, of risks in the Great Tit Parus major

Great Tit (Parus major) Science Article 24 abstract Great Tits Parus major and other small birds at temperate latitudes insure against overnight starvation in winter by building up a fat reserve each day, which is then depleted over night. Because this may increase their risk of predation, the levels of fat reserves carried appear to […]

The quality of pied flycatcher (Ficedula hypoleuca) and great tit (Parus major) females in an air pollution gradient

Great Tit (Parus major) Science Article 5 abstract We studied whether pied flycatcher (Ficedula hypoleuca) and great tit (Parus major) females differed in quality between polluted and unpolluted habitats. Comparing female condition between incubation and nestling periods, we aimed at testing whether biometric differences in F. hypoleuca females were caused by assortative settlement (i.e. intraspecific […]

Effects of local environmental conditions on nestling growth in the Great Tit Parus major

Great Tit (Parus major) Science Article 15 abstract Daily weight increments of nestling Great Tits are expressed as ratios of observed increment divided by the increment expected under favourable conditions. We used this ratio to examine the effects of local environmental conditions on nestling growth. We demonstrate a positive relationship between nestling growth and food […]

Metabolic response to temperature variation in the great tit: an interpopulation comparison

Great Tit (Parus major) Science Article 27 abstract We studied the resting metabolic rate (MR) from two great tit Parus major (Linnaeus) populations living in different winter regimes. Birds from the two different localities were exposed individually to +25 deg C, 0 deg C and -10 deg C for the night in three consecutive sessions […]

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

Great Tit (Parus major) Science Article 34 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 […]