期刊
MARINE ECOLOGY PROGRESS SERIES
卷 655, 期 -, 页码 215-225出版社
INTER-RESEARCH
DOI: 10.3354/meps13518
关键词
Seabirds; Food web; Stable isotopes; Foraging plasticity; Ecosystem monitoring
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2012-1832, PICT 2014-1870]
- Wildlife Conservation Society
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Antarctic Research Trust
- AMP Namuncura-Banco Burdwood
- CONICET
- [PICT 2013-2228]
- [PICT 2016-0195]
Inter-annual variations in the diets of seabirds are often a reflection of resource availability, with population dynamics and community structure implications. We investigated the trophic niche of Magellanic penguins Spheniscus magellanicus during the pre-molt stage in 6 years (2009 and 2013-2017) at Martillo Island, Beagle Channel, Argentina, using carbon and nitrogen stable isotope analysis of feathers. We found higher values in 2009 compared to the other years for both isotopes and estimated different proportions of prey in the diet of Magellanic penguins throughout the years. In 2009, penguins consumed mainly a mixture of benthic and benthopelagic fish, whereas from 2013 to 2017, the proportion of the pelagic form of squat lobster Munida gregaria, considered a key species in the Beagle Channel, increased over time and nearly dominated diets in 2017. Our results confirm that Magellanic penguins act as sentinels, reflecting shifts in the marine community of the Beagle Channel via inter-annual variation in their trophic niche and diet composition.
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