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2009 | 57 | 4 |

Tytuł artykułu

Influence of low temperatures on behaviour of mallards [Anas platyrhynchos L.]

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Periods of severe winter weather are associated with increased food consumption and metabolic rates. Depending on food availability birds could use different strategies to maintain homeostasis. Mallards Anas platyrhynchos L. numerously winter in urban parks, where people feed waterfowl bread. This food source is easily digestible and provides a high energy, which may affect bird behaviour. Studies were conducted in two consecutive winters in the Gdańsk-Oliwa city park in northern Poland, a place where people feed mallards, bread daily. During the period of lowest temperatures (about -12°C) females spent only 6% of their time foraging, while males spent 17% foraging. During mild winter weather (mean temperature about -2°C) foraging took up 21% of time budget in both sexes. In the colder period a three fold increase in male agonistic behaviour was observed when compared to the mild period observations. Females spent the most of harsh winter period inactive, apparently relaying on accumulated energetic reserves. Males cannot reduce all activities like females, because pairing in mallards takes place mainly in autumn and early winter and males need to attract actively, display for, and defend mates.

Wydawca

-

Rocznik

Tom

57

Numer

4

Opis fizyczny

p.799-803,fig.,ref.

Twórcy

autor
  • University of Gdansk, Al. Legionow 9, PL 80-441 Gdansk, Poland
autor

Bibliografia

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  • Boos M., Zorn T., le Maho Y., Groscolas R., Robin J.-P. 2002 – Sex differences in body composition of wintering Mallards (Anas platyrhynchos): possible implications for survival and reproductive performance – Bird Study, 49: 212–218.
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  • Jorde D.G., Krapu G.L., Crawford R.D., Hay M.A. 1984 – Effects of weather on habitat selection and behavior of Mallards wintering in Nebraska – Condor, 86: 258–265.
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  • Owen R.B. Jr. 1970 – The bioenergetics of captive Blue-winged Teal under controlled and outdoor conditions – Condor, 72: 153–163.
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Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

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