INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Winter dispersion in Magellanic Penguins: differences between sexes and years.
Autor/es:
NAHUEL, MARCHISIO; CIANCIO, JAVIER; FRERE, ESTEBAN; MELINA BARRIONUEVO; ANTJE STEINFURTH
Lugar:
Dunedin
Reunión:
Conferencia; 10th International Penguin Conference; 2019
Resumen:
Magellanic Penguin migration has only recently started to be completely studied. This species is the most migratory of the Spheniscus genus and has a major role in balancing the marine ecosystem of the Patagonian shelf, because of its large prey consumption. To study its migration, we have attached 26 geolocators (MK3 & MK4) to adults during two years 2017-2018 in Puerto Deseado, Argentina (47°45´S, 65°53´W). Preliminary analysis of 12 devises revealed that the distance covered by penguins varied between years, being almost double in 2018 compared to 2017 (x2017=21803 km, x2018=45023 km, t=3.60, p=0.005). Kernels densities also showed differences in habitat use, being penguins in 2017 more widely distributed along the Argentinean platform than in 2018, specially during May and August. Each individual had a larger path in 2018, but the used area by all penguins was smaller in 2018 than in 2017. Preliminary analysis showed that penguins locations are closely related to SST~10°C and that there were differences in SST between years. There were differences in the longitudinal distribution between sexes: males reached further distances from the coastline (t=2.01, p=0.07), and were closer to the 200-isobath (t=-2.43, p=0.04) and more time behind the 200-isobath (t=-1.98, p=0.05) than females. In 2017, stable isotopes analysis of blood samples when arriving to the colony from migration revealed differences between sexes in C13 showing a possible segregation in the diet. Studying penguin migration during many years is key to help in their conservation and to understand the health of the oceans.