Cited by 20Isotope Analysis in EcologyMarine animal studies overviewMarine and fisheries research

Diet composition of expanding breeding populations of the Magellanic Penguin

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Fernandez, Santiago José, Yorio, Pablo, Ciancio, Javier Ernesto·2019·Marine Biology Research

Abstract

The Magellanic Penguin (Spheniscus magellanicus) is the most abundant and widely distributed seabird breeding on the Patagonian Coast of Argentina. We combined conventional stomach content and stable isotope analysis to assess Magellanic Penguin diet during the chick rearing stage at the two northernmost colonies in an area subject to fisheries. In 2011 and 2013, Thornfish (Bovichtus argentinus) was the main prey by mass at Complejo Islote Lobos (63.0% and 32.3%, respectively) and Argentine Anchovy (Engraulis anchoita) at Estancia San Lorenzo (85.2 and 63.3%, respectively). Magellanic Penguins from both colonies showed low isotopic niche overlap in 2011 (36%) and no overlap in 2013, suggesting a different use of prey species and/or foraging areas. Stable isotope mixing models showed that Argentine Anchovy (52.8%) and Thornfish (65.9%) were the main prey at Complejo Islote Lobos in 2011 and 2013, respectively, while Patagonian Redfish (Sebastes oculatus) (46.4%) and Squat Lobster (Munida gregaria) (50%) were the main prey at Estancia San Lorenzo in 2011 and 2013, respectively. Results show that in addition to Argentine Anchovy, previously recognized as main prey for breeding Magellanic Penguins in northern Patagonia, other juvenile or small sized fish are important diet items. Diet results suggest different scenarios of food conditions for each colony, despite the relative short distance between breeding locations. The low contribution of Argentine Hake (Merluccius hubbsi) and Argentine Shortfin Squid (Illex argentinus) suggests a low trophic overlap with commercial fisheries. The information provided is key to understand changes in the marine ecosystem and potential penguin-fishery interactions.

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Crossref · 10.1080/17451000.2019.1596286

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Authors
Fernandez, S. J., Yorio, P., & Ciancio, J. E.
Affiliations
  • Centro para el Estudio de Sistemas Marinos (CESIMAR), CONICET, Puerto Madryn, Argentina
  • Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
Venue
Marine Biology Research
Published
2019-01-02
Volume
15
Issue
1
Pages
84-96
ISSN
  • 1745-1000 (ISSN-L)
  • 1745-1019
OpenAlex
W2943678139
Cited by
20
References
66
Citations by year
2026: 3 · 2025: 4 · 2024: 3 · 2023: 1 · 2022: 3 · 2021: 4 · 2020: 2
FWCI
1.43
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • Marine Biology Research (publishedVersion)
  • CONICET Digital (CONICET) (submittedVersion, cc-by-nc-sa)
Topics
  • Physical Sciences › Environmental Science › Ecology › Isotope Analysis in Ecology
  • Physical Sciences › Environmental Science › Ecology › Marine animal studies overview
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
Keywords
Magellanic penguin, Spheniscus magellanicus, diet composition, prey selection, chick rearing, stable isotopes, isotopic niche overlap, fisheries impacts, Argentine anchovy, Engraulis anchoita, Munididae, Munida gregaria, Patagonian coast, seabird foraging

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