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Reversed sexual dimorphism in tawny owls, Strix aluco, correlates with duty division in breeding effort by Peter Sunde; Mikkel S. Bølstad; Julie D. Møller is a Environmental Science article available to read on EtoBox.

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Even though most bird species with a raptorial feeding habit express varying extents of reversed sexual dimorphism (RSD: females bigger than males), the evolutionary basis for its maintenance, as well as its possible secondary consequences for the ecological adaptations of the different sexes, is debated. We studied pairs of tawny owls, __Strix aluco__ (females 20% heavier than males), throughout the year by telemetry to test whether any inter‐sexual differences in movement patterns, resource partitioning and breeding effort correlated with RSD. Females were larger than males in all body size measures and were 16% heavier than would be expected from the difference in wing length alone. In accordance with predictions from flight economics, males moved longer distances per time unit than females, in particular during the post‐fledging season, when they also fed chicks more often than the females. Males had larger home ranges than females during the post‐fledging period, whereas the sexes had home ranges of equal size during the non‐breeding season. Until 10 days after fledging, females foraged much closer to the offspring than males, apparently balancing their distance to offspring b

Who reads Reversed sexual dimorphism in tawny owls, Strix aluco, correlates with duty division in breeding effort?

Author

Peter Sunde; Mikkel S. Bølstad; Julie D. Møller

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; JSTOR (ISSN 0030-1299)

Published

2003

Language

EN

Field

Environmental Science (Physical Sciences)