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Lek site defines annual spatial use of male Black Grouse (Tetrao tetrix)

Borecha, Degitu Endale; Willebrand, Tomas; Nielsen, Olafur K.
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2448495
Date
2017
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  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [3069]
  • Publikasjoner fra Cristin - INN [2538]
Original version
Ornis Fennica. 2017, 94 .  
Abstract
Adult male Black Grouse (

Tetrao tetrix

) are assumed to use the same lek throughout their

life-span and juveniles are rarely observed settling far from their natal areas. Here we re-

port results on a study of lek site fidelity in male Black Grouse using mark-recapture, ra-

dio-telemetry, and lek observations between 1984 and 1992. Data were collected at two

sites in central Sweden with six and two lek

s, respectively. A total of 306 Black Grouse

(230 full-grown adult and juvenile males, and 76 chicks) were captured and tagged. We

found that all recaptured males tagged as chicks (

n

= 7) were caught on the lek closest to

their initial capture site. Twenty-six percent (

n

= 59) of individuals ringed as full-grown

were recaptured at least once in the subseque

nt springs. Fewer individuals attended leks

during the mating period than the premating period (

t

(15)

= 3.06,

P

= 0.008). Juvenile males

were closer to the lek in the premating period (95% confidence interval = 0.45–0.65 km)

than in the mating period (0.73–1.13 km), in contrast to adults, which were closer to leks

in the mating period (0.44–0.61 km) than the premating period (0.80–0.95 km). Inter-lek

movement probability of the birds was 15% (

n

= 9) in the study area. Male Black Grouse

remain close to their lek all year round and their recruitment is local. This indicates that

leks consist of well-defined local populations

, which have limited interactions with other

leks.
Journal
Ornis Fennica

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