Dietary composition of neartic shorebirds during their migratory stopover in Caleta Malaspina, Chubut, Argentina.

NAVOA XIMENA; CARILEO JUAN; BALA LUIS; CASTILLO JOANNA M; TISERA CANDELA; ARANDA CAMILA; COLAZO ANA; LUNA FACUNDO; MUSMECI LUCIANA

Ciudad de Panamá

Congreso; 8 Western Hemisphere Shorebird Group Meeting; 2019

WHSN; Audubon Panamá

Dietary composition of neartic shorebirds during their migratory stopover in Caleta Malaspina, Chubut, Argentina. Joanna Castillo¹, Ana Colazo², Ximena Navoa⁴, Candela Tisera², Facundo Luna², Juan Carileo², Camila Aranda², Luciana Musmeci¹, y Luis Bala¹, ³1 Instituto de Diversidad y Evolución Austral CCT CENPAT ? CONICET. Bvard. Brown 2915, Puerto Madryn, Argentina. jcastillo@cenpat-conicet.gob.ar2 Universidad Nacional de la Patagonia San Juan Bosco, Bvard. Brown 3051, Puerto Madryn, Argentina.3 Academia Nacional de Ciencias de Buenos Aires, Av. Alvear 1711, Ciudad de Buenos Aires, Argentina.4 Instituto de Investigación de Hidrología, Universidad Nacional de la Patagonia San Juan Bosco. 9 de Julio 25, Trelew, Argentina. Knowledge dietary requirements in stopover sites is a key to conservation of shorebirds. In this work assessed the diet of neartic shorebirds in their migratory stopover at Caleta Malaspina, Argentina during the austral summer, autumn, winter and spring of 2018. The diet of White Rumped Sandpiper (WRS), Hudsonian Godwit (HUGO) and Red Knot (REKN) was reconstructed by analysis of faeces. Frequency of occurrence of prey was calculated and inter e intraspecific dietary composition (except for REKN, was present only in winter) was compared by an analysis of similarities (ANOSIM). The trophic supply was assessed through benthic samples and was estimated the abundance and diversity of invertebrate community in each season. The WRS consumed mainly amphipods and unmandible polychaetes, their being diet similar in all season. The main prey consumed by HUGO were polychaetes Platynereis sp., followed by the polychaete Cerathocephale sp. and little clams in autumn, while consumed manly Cerathocephale sp. followed by Platynereis sp and little clams in winter and spring, and their diet was different in all seasons. The REKN consumed mostly crabs followed by polychaetes Platynereis sp, and fishes in equal proportion. The diet composition was different between species; however, the density and diversity of invertebrate community was similar in all seasons. These results showed a differential use of food resources, when shorebird use a different type of prey while coexisting in a migratory stopover.