Differences between colonies and chick-rearing stages in Imperial Cormorant diet composition: implications for trophic studies and monitoring/Diferencias entre colonias y etapas de crianza de los pichones en la composicion de la dieta del Cormoran Imperial : implicancias para los estudios troficos y el monitoreo
We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thu...
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Published in | The Wilson journal of ornithology Vol. 130; no. 1; p. 224 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Wilson Ornithological Society
01.03.2018
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Abstract | We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vemaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park. Received 18 October. Accepted 19 April 2017. Key words: Argentina, diet, Golfo San Jorge, Phalacrocorax atriceps, seabirds, site differences. Evaluamos las diferencias en la composicion de la dieta entre Phalacrocorax atriceps que se reproducen en Isla Arce e Isla Vernaci Este, Golfo San Jorge. Argentina. Ambas colonias estan ubicadas dentro del parque marino Patagonia Austral y pesquerias comerciales de arrastre operan en aguas adyacentes, por lo que el conocimiento de sus requerimientos alimentarios es fundamental para evaluar potenciales conflictos y monitorear interacciones. Obtuvimos contenidos estomacales de 63 Phalacrocorax atriceps adultos durante el periodo de crianza de pichones en 2014: 32 en Isla Arce y 31 en Isla Vernaci Este. Registramos 27 y 30 items presa en los contenidos estomacales de Isla Arce e Isla Vernaci Este, respectivamente, y al menos 21 fueron comunes a ambas islas. Se encontraron diferencias significativas en la composicion de la dieta en terminos de importancia en peso entre las etapas de pichones temprana y tardia en Isla Arce pero no en Isla Vemaci Este. Patagonotothen spp. fueron dominantes en Isla Vemaci Este durante las dos etapas de pichones (75.7% y 86.5%, respectivamente). En Isla Arce, Patagonotothen spp., Engraulis anchoita y Merluccius hubbsi contribuyeron de manera similar a su dieta (26-33%) durante la etapa de pichones temprana, mientras que Engraulis anchoita domino durante la etapa de pichones tardia (76.6%). La composicion de la dicta en terminos de importancia en peso fue significativamente diferente entre las colonias. Phalacrocorax atriceps consumio presas bentonicas, demersales y pelagicas, confirmando la plasticidad en sus habitos alimenticios, pero su contribucion difirio dependiendo del sitio y la etapa de pichones. Nuestros resultados sugieren que la evaluacion de la dieta y el monitoreo de la interaccion potencial entre Phalacrocorax atriceps y las pesquerias no deberian basarse en informacion de una sola etapa o sitio de reproduccion, sino que requieren del analisis de la composicion de la dieta a lo largo del ciclo reproductivo en una muestra representativa de las 17 colonias ubicadas dentro del parque marino. Palabras clave: Argentina, aves marinas, dieta, diferencias entre sitios, Golfo San Jorge, Phalacrocorax atriceps. |
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AbstractList | We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vemaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park. Received 18 October. Accepted 19 April 2017. Key words: Argentina, diet, Golfo San Jorge, Phalacrocorax atriceps, seabirds, site differences. Evaluamos las diferencias en la composicion de la dieta entre Phalacrocorax atriceps que se reproducen en Isla Arce e Isla Vernaci Este, Golfo San Jorge. Argentina. Ambas colonias estan ubicadas dentro del parque marino Patagonia Austral y pesquerias comerciales de arrastre operan en aguas adyacentes, por lo que el conocimiento de sus requerimientos alimentarios es fundamental para evaluar potenciales conflictos y monitorear interacciones. Obtuvimos contenidos estomacales de 63 Phalacrocorax atriceps adultos durante el periodo de crianza de pichones en 2014: 32 en Isla Arce y 31 en Isla Vernaci Este. Registramos 27 y 30 items presa en los contenidos estomacales de Isla Arce e Isla Vernaci Este, respectivamente, y al menos 21 fueron comunes a ambas islas. Se encontraron diferencias significativas en la composicion de la dieta en terminos de importancia en peso entre las etapas de pichones temprana y tardia en Isla Arce pero no en Isla Vemaci Este. Patagonotothen spp. fueron dominantes en Isla Vemaci Este durante las dos etapas de pichones (75.7% y 86.5%, respectivamente). En Isla Arce, Patagonotothen spp., Engraulis anchoita y Merluccius hubbsi contribuyeron de manera similar a su dieta (26-33%) durante la etapa de pichones temprana, mientras que Engraulis anchoita domino durante la etapa de pichones tardia (76.6%). La composicion de la dicta en terminos de importancia en peso fue significativamente diferente entre las colonias. Phalacrocorax atriceps consumio presas bentonicas, demersales y pelagicas, confirmando la plasticidad en sus habitos alimenticios, pero su contribucion difirio dependiendo del sitio y la etapa de pichones. Nuestros resultados sugieren que la evaluacion de la dieta y el monitoreo de la interaccion potencial entre Phalacrocorax atriceps y las pesquerias no deberian basarse en informacion de una sola etapa o sitio de reproduccion, sino que requieren del analisis de la composicion de la dieta a lo largo del ciclo reproductivo en una muestra representativa de las 17 colonias ubicadas dentro del parque marino. Palabras clave: Argentina, aves marinas, dieta, diferencias entre sitios, Golfo San Jorge, Phalacrocorax atriceps. |
Audience | Academic |
Author | Suarez, Nicolas Yorio, Pablo Ibarra, Cynthia Marinao, Cristian |
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Title | Differences between colonies and chick-rearing stages in Imperial Cormorant diet composition: implications for trophic studies and monitoring/Diferencias entre colonias y etapas de crianza de los pichones en la composicion de la dieta del Cormoran Imperial : implicancias para los estudios troficos y el monitoreo |
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