Causes of Death of Adult Tawny Owls Strix Aluco in Some Forests of the Burgundy

27 Mar Causes of Death of Adult Tawny Owls Strix Aluco in Some Forests of the Burgundy

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Abstract

English Abstract

200 Tawny Owl nest-boxes were set up in three
Oak forest and two Beech forests (over 150km2).
They are being monitored two to three times a year.
A maximum number of adult were caught and
ringed. There age was recorded by they being
rung as chicks or using the flight feather pattern.
This monitoring has shown that adult tawny owls
only move outside their territory under exceptional
circumstances. The replacement of the male from a
nest boxes indicates the previous male is dead.
Pine Marten prédation does not affect Tawny Owl
population in the area, but road traffic is an importance
source of mortality. Nest boxes situated near
major roads show a high adult turnover rate. In
areas away from majors roads Tawny Owl live on
average two years older.