Nestling growth and brood reduction in the wheatear Oenanthe oenanthe

Abstract:

The mass gain and the incidence of starvation of nestling Wheatears Oenanthe oenanthe L. were recorded in two East Swedish study areas. Some broods were manipulated. A rough estimate of the degree of hatching asynchrony was derived from the number of daily visits between hatching of the first and last chicks of the brood. Mass gain in 23 broods was fitted to a logistic equation and the growth rate (K=0.50), asymptote (A=22.3 g) and time to reach the inflection point () were calculated. For comparisons between broods the linear growth rate on days 3-8, the mean plateau masses for days 9-15, the mean maximum masses attained, and the mean final masses on days 13-15, were used. Growth rates and plateau masses were not obviously related. Brood size and degree of hatching asynchrony had no effect on these growth parameters, while brood enlargements and reductions affected differently growth …

Año de publicación:

1987

Keywords:

Fuente:

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