Mixed roosts in the Montagu’s harrier Circus pygargus during courtship

Wiącek, Jarosław

doi:10.2478/s11756-010-0021-y

Cited by 2 publications

(2 citation statements)

References 23 publications

(20 reference statements)

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“…Nevertheless, the fact that they attacked the decoy when being tagged shows that they took an active part in defending the colony's welfare, thus decreasing individual costs of nest defence (Arroyo et al 2001). Communal roosting could help with predator detection at the roost site and thus provide benefits to all members of the group (Wiacek 2010). We observed most communal roosting of tagged males in the pre-breeding period and of females during post-breeding.…”

Section: Social Interactionsmentioning

confidence: 76%

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Changing places: spatial ecology and social interactions of female and male Montagu’s Harrier (Circus pygargus) in the Spanish Extremadura

et al. 2021

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The ground nesting raptor Montagu’s Harrier breeds in loose colonies in cereal fields in the Spanish Extremadura. It is unclear how and whether birds in different colonies interact and how harriers spend time before and after nesting, before starting migration. We used GPS–GSM tags deployed on ten females and three males, some over multiple seasons, to follow bird movements with unprecedented detail. Arriving from spring migration, all males and most females returned to their old nest site, and spent between 13 and 25 days in mate choice and local site inspection. During incubation and early nesting female movements were strongly reduced, but increased significantly during late nesting and post-fledging periods. After fledging or after breeding failure, females increased their flying radius. Some of them visited other colonies, for single days or for longer periods, or flew long distances within Spain. These visits might have included help in breeding attempts of other pairs (adoptions). Four out of six females returned to their own breeding site before starting migration. Several females repeatedly used common roosts in this phase. Non-breeding females were active in defending nests in the colony against predators. Females with successful brood initiated migration earlier and spent less time in Spain than non-breeders or those with predated nests. Unlike females, daily distances in males were more uniform. While all males remained in the breeding area for the entire season, their activity centres shifted more within that area than those of females.

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Section: Social Interactionsmentioning

confidence: 76%

“…Our loggers reported also positions during night time, allowing us to report about communal roosting (Wiacek 2010), which we define here as nights when fixes were less than 200 m apart. Over the entire year 2020, males had 40 "common roost" nights.…”

Section: Common Roostmentioning

confidence: 99%