Regurgitation of the koilin layer in chinstrap penguins (Pygoscelis antarcticus) and its association with gastric parasites

• Published in: Polar Research
• Main Authors: Han-Kyu Kim, Chang-Yong Choi, Min-Su Jeong, Hwa-Yeon Kang, Woo-Shin Lee
• Format: Article in Journal/Newspaper
• Language: English
• Published: Norwegian Polar Institute 2016
• Subjects: Cuticula gastris; host-parasite interaction; nematodes; parasitic load; regurgitation; Stegophorus macronectes; Environmental sciences; GE1-350; Oceanography; GC1-1581; Austral; King George Island; South Shetland Islands; Antarc*; antarcticus; Polar Research
• Online Access: https://doi.org/10.3402/polar.v35.25966; https://doaj.org/article/612ffb0229f24f0b9038d24a159ec506

The koilin membrane, formed by the secretions of the ventricular and pyloric glands, functions as a protective layer in the gizzards of most bird species. However, the ecological functions of koilin have never been studied in free-ranging penguins. During the two austral summers from 2012 to 2014, we observed the regurgitated koilins of chinstrap penguins (Pygoscelis antarcticus) at Narębski Point on King George Island, South Shetland Islands, and we detected a significant difference in the daily accumulation of regurgitated koilins between the pre-hatching and post-hatching periods in the rookery. We also found 233 gastrointestinal parasites, all Stegophorus macronectes (Nematoda, Acuariidae), from 26 out of 45 koilins freshly regurgitated by chinstrap penguins. We suggest that the regurgitation of koilins may benefit adult chinstrap penguins in the wild by reducing parasitic loads when they fast during incubation; it may also help decrease the risk of parasite transmission to chicks. Our results present the first observations of regurgitated koilins among breeding chinstrap penguins. How koilin regurgitation functions in penguins requires further study. Among the gentoo penguins (P. papua) co-occurring at the study site, we observed no regurgitated koilin layers.