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• W1497196949 abstract "The rock ptarmigan (Lagopus muta) is a common breeding bird in Iceland and the population shows fairly regular 10-year cycles. Independent of the cycle the population has been declining 4% annually for the last decades and the amplitude is markedly reduced. In this study two questions are addressed. One is whether generalist predators can cause the dampening of the population cycle and the decline of the population. The other is whether there is an age related difference in chick production, which is information needed to refine a population model of the ptarmigan in Iceland. Hens were trapped in two areas in Iceland, one in the north-east in 2009 and 2010 and the other close to the city Reykjavik in the south-west in 2007 and 2008. Two age groups were identified, birds from previous summer (yearlings) and older birds (adults). All hens were radio tagged and monitored once a week during May through August. Mortality causes were estimated as well as reproductive success. The result shows no statistical difference between age groups regarding survival of hens or number of chicks in August while the difference between areas was large. Survival and reproduction were higher in the north-east where the population increased 3.7-fold during the breeding season while in the south-west the population increase was only 1.6-fold. The proximate reason for this difference was high predation by generalist mammalian predators on hens in the south-west and low chick production.; Rjupa (Lagopus muta) er algengur varpfugl a Islandi og stofninn sýnir reglulegar sveiflur i fjolda. Hver sveifla tekur um 10 ar og margfaldast stofninn milli lagmarks- og hamarksara. Ohað sveiflunum hefur stofninn minnkað um 4% a ari siðustu aratugi og hamork orðið sifellt laegri. I þessari rannsokn er leitað svara við tveimur spurningum. Onnur snýr að þvi hvort aukið afran a kvenfuglum yfir sumartimann geti verið orsok breytinga i stofnsveiflunum. Hin snýr að þvi að afla upplýsinga um ungaframleiðslu eftir aldri en þaer upplýsingar vantar til að haegt se að baeta stofnlikan sem gert hefur verið fyrir rjupuna. Kvenfuglar rjupunnar voru fangaðir a tveimur svaeðum, a Suðvesturlandi 2007 og 2008 og Norðausturlandi 2009 og 2010 og þeir flokkaðir i tvo aldursflokka, arsgamla fugla og tveggja ara og eldri. Utvarpssendar voru settir a fuglana og þeim fylgt eftir einu sinni i viku yfir vor og sumar. Affoll voru skrað sem og varparangur. Ekki maeldist marktaekur munur a affollum eða varparangri eftir aldri en niðurstoðurnar sýna mikinn mun a milli svaeða þar sem afoll kvenfugla voru mun meiri og varpafkoma slakari a Suðvesturlandi en Norðausturlandi. Eftir niðurstoðum þessara rannsokna að daema þa 3,7 faldaðist stofninn yfir sumartimann a Norðausturlandi en 1,6 faldaðist a Suðvesturlandi sem er 2,3 faldur munur. Naertaekar skýringar þessa munar voru meira afran spendýra a kvenfugla og minni ungaframleiðsla a Suðvesturlandi en a Norðausturlandi." @default.
• W1497196949 created "2016-06-24" @default.
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• W1497196949 date "2012-05-01" @default.
• W1497196949 modified "2023-09-27" @default.
• W1497196949 title "Reproductive success and survival of hen rock ptarmigan (Lagopus muta) during summer" @default.
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