Recent Trends in First-Year Survival for Black Brant Breeding in Southwestern Alaska

The condor

James S. Sedinger¹ 

关键词: Black Brant;    Branta bernicla nigricans;    harvest;    population dynamics;    recruitment;    survival;   

DOI  :  10.1525/cond.2011.100218

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. We estimated first-year and adult survival of Black Brant (Branta bernicla nigricans) from the Yukon—Kuskokwim Delta, Alaska, to assess (1) the role that first-year survival plays in declining recruitment and in the local breeding population's decline since the early 1980s and (2) the potential role of subsistence harvest in declining first-year survival. We used band-recovery models in program Mark to estimate band-recovery rates and annual survival from 1986 to 2007. The only models of band recoveries that received support contained annual variation and an additive effect of sex on band-recovery rates. The two best-supported models of annual survival differentiated between first-year and older Black Brant. The best-supported model (Akaike weight = 0.69) included a linear trend in first-year survival, while the second best-supported model (Akaike weight = 0.20) included an effect of mean gosling mass on first-year survival. Band-recovery rates corresponded to harvest rates of ∼1%, indicating th...

【 授权许可】

CC BY