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Tytuł artykułu

Nest defence intensity in House Sparrows Passer domesticus in relation to parental quality and brood value

Warianty tytułu
Intensywność obrony gniazda u wróbla
Języki publikacji
We investigated whether brood value (laying date, brood size, nestling age and condition) and parental quality (condition, male badge size) affect experimentally provoked nest defence in House Sparrows in the Czech Republic. We included the badge size (a melanin-based throat feather patch) because it serves as a signal of social status, age and condition. We presented a stuffed Black-billed Magpie Pica pica to 19 pairs of sparrows. To assess the defence intensity we used the „risk index", increasing with time spent reacting and riskiness of the reaction (number of approaches and attacks), while declining with increasing distance from the predator. Females did not adjust their nest defence to the brood value and males did so only partially, tending to defend the early broods more intensely, which marginally supports the "value of offspring hypothesis". The birds did not adjust their nest defence to quality or defence intensity of their partners, thus the "differential allocation hypothesis" was not supported. Male nest defence was more intense than in females and increased with male badge size. As male contribution to nest defence may affect the breeding success, we hypothesize the badge size could be used as a signal of nest defence intensity used by females.
W pracy analizowano dwa czynniki, które mogą wpływać na intensywność obrony gniazda u wróbla: jakość rodziców (określoną jako ich kondycja oraz wielkość czarnego krawata samca) oraz „potencjał” lęgu (określony jako liczba piskląt, ich kondycja i data złożenia jaj). W eksperymencie na dachu skrzynki lęgowej 19 par wróbli umieszczano wypchaną srokę (symulacja ataku drapieżnika na lęg) i przez 20 min określano ich reakcję. Aby ocenić intensywność obrony gniazda do analiz wykorzystano obliczony „wskaźnik ryzyka”, który bierze pod uwagę m. in. długość reakcji oraz agresywność ptaków. Samce broniły lęgów intensywniej niż samice (Tab. 1), przy czym intensywność obrony zwiększała się wraz z wielkością krawata samca (Fig. 1). Stwierdzono, że samice nie zwiększały swej obrony w związku z „potencjałem” lęgu, zaś samce nieznacznie silniej broniły lęgów wczesnych (Tab. 2).
Słowa kluczowe
Opis fizyczny
  • Department of Zoology, Faculty of Science, Charles University, Vinicna 7, CZ 122 48 Prague 2, Czech Republic
  • Department of Zoology, Faculty of Science, Charles University, Vinicna 7, CZ 122 48 Prague 2, Czech Republic
  • Department of Zoology, Faculty of Science, Charles University, Vinicna 7, CZ 122 48 Prague 2, Czech Republic
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