Fuglekiggevæg

Source: © Dieder Plu

Description

Kukuku

I Europa er kukukken vidt og bredt kendt for deres særprægede vaner med at lægge æg i andre fugles reder. Derudover har de en præference for en hel række værtfugle. Imellem disse finder vi både standfugle som vinterkonge og hækspurv samt langdistancetrekkere som lille kærkurr og rørspurv.

Forskellige europæiske undersøgelser har vist, at klimaforandringer tvinger kukukken til at vælge en bestemt vært. Under indflydelse af højere forårstemperaturer starter størstedelen af standfuglene og kortdistancetrekkere deres yngletid tidligere. Disse kortdistancetrekkere har nemlig fremskyndet deres ankomstdato mere end langdistancetrekkere. Når kukukken vender tilbage fra tropisk Afrika, viser det sig, at mange af disse arter allerede er langt inde i ynglesæsonen, hvilket gør det svært for den at lægge et æg i deres rede uden at blive opdaget. Derfor er kukukken primært afhængig af langdistancetrekkere, som vender tilbage i samme periode som den selv, såsom kærkurrer og gråspurve.

Godt nyt for rødhals, hækspurv osv. Disse standfugle vil opleve mindre af kukukkens yngleparasitisme, mens kærkurrer og andre afrikanske migranter vil opleve mere.

Kilde: Klimakursus 'Tag Menneskerne Med'

www.cvn.naturpunkt.dk

Translated by OpenAI

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