{"id":3773,"date":"2016-01-05T20:12:00","date_gmt":"2016-01-05T20:12:00","guid":{"rendered":"https:\/\/seapop.no\/?p=3773"},"modified":"2021-02-26T12:23:30","modified_gmt":"2021-02-26T11:23:30","slug":"variations-in-foraging-areas-stress-levels-and-timing-of-breeding-in-kittiwakes","status":"publish","type":"post","link":"https:\/\/seapop.no\/en\/2016\/01\/variations-in-foraging-areas-stress-levels-and-timing-of-breeding-in-kittiwakes\/","title":{"rendered":"Variations in foraging areas, stress levels and timing of breeding in kittiwakes"},"content":{"rendered":"\n

Late breeding usually occurs during years of poor environmental conditions, but the proximate mechanisms underlying this phenological pattern have been poorly documented.In this study reasearchers combined the deployment of GPS devices (from 2008 to 2010) and the monitoring of breeding parameters and baseline corticosterone levels (from 2007 to 2011) to investigate the proximate regulation of breeding date in a population of black-legged kittiwake.<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/p>\n\n\n\n

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The timing of breeding varied considerably during the course of the study and late breeding was associated with reduced clutch size and low breeding success at the individual level. Trips lasted longer and were to greater distances in 2009, the year of late breeding, compared to 2008 and 2010, highlighting a food scarcity in 2009. Corticosterone levels differed among years, and were the lowest in 2010, the year of earliest breeding. 2009 var et \u00e5r med lite mat, det resulterte i at fuglene foretok lengre turer, b\u00e5de i tid og rom, samt en sen hekking. Det var en betydelig variasjon i stressniv\u00e5ene fra \u00e5r til \u00e5r, med lavest niv\u00e5 i 2010, som ogs\u00e5 var \u00e5ret med tidligst hekking og de korteste turene.<\/p>\n\n\n\n

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