Effects of Radio Packages on Reproductive Success of Willow Grouse

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Abstract
Effects of breast-mounted radio packages on female willow grouse (Lagopus lagopus) were investigated during 2 breeding seasons by comparing hens with transmitters and hens only ringed or not marked at all. Yearling and older hens quickly adapted to the transmitter and incubated and hatched their eggs normally. Weight increase in chicks was similar in broods in both groups. Chick survival between 11 and 21 days after hatching was lower (P < 0.01) in broods of radio-equipped hens. Radio packages did not appear to influence behavior of the hen to the detriment of the brood. Conspicuous colors of radio packages used may have made broods more vulnerable to predators.

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