INVESTIGADORES
RICCIALDELLI luciana
artículos
Título:
Inter-annual variation in the trophic niche of Magellanic penguins Spheniscus magellanicus during the pre-molt period in the Beagle Channel
Autor/es:
DODINO, S; RICCIALDELLI, L; POLITO, MJ; PÜTZ, K; RAYA REY, A
Revista:
MARINE ECOLOGY PROGRESS SERIES
Editorial:
INTER-RESEARCH
Referencias:
Lugar: Oldendorf/Luhe; Año: 2020 vol. 655 p. 215 - 225
ISSN:
0171-8630
Resumen:
Inter-annual variations in the diets of seabirds are often a reflection of resourceavailability with population dynamics and community structure implications. We investigatedMagellanic penguin´s trophic niche during the pre-molt stage across 6 years from 2009 and 2013to 2017 at Martillo Island, Beagle Channel, Argentina, using carbon and nitrogen stable isotopeanalysis of feathers. We found higher values in 2009 compared to the other years for bothisotopes and estimated different proportions of prey in the diet of Magellanic penguins throughoutthe 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 dietsin 2017. Our results confirm that Magellanic penguins act as sentinels, reflecting shifts in themarine community of the Beagle Channel via inter-annual variation in their trophic niche and dietcomposition.