CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Seascape modeling of southern giant petrels from Patagonia during different life-cycles
Autor/es:
JUAN P. PISONI; SÁNCHEZ-CARNERO; GABRIELA S. BLANCO; FLAVIO QUINTANA
Reunión:
Congreso; Ornithological Congress of the Americas; 2017
Resumen:
The Ecological Niche Factor Analysis (ENFA) is a presence-only model that generateshabitat suitability (HS) maps by understanding the choices of resources that areunequally used when they are equally available in a study area. Here, we determinedthe factors affecting foraging distribution of the Southern Giant Petrel (SGP) fromnorthern Patagonian colonies (Isla Arce and Isla Gran Robredo) using ENFA. Data onmovements of 17 adults and nine first-year juvenile SGP were gathered using satellitetelemetry. Model eco-geographical variables (EGVs) (geographic, biological, andoceanographic) overlapped at a temporal and spatial scale the tracked animals. Theresulting HS maps included most of the tracking locations along the ArgentineanContinental Shelf. Wind conditions and primary productivity shaped the HS of petrelsover the year. However, different EGVs influenced differently this population dependingon the requirements of their life stage. Juveniles showed high marginality (values of EGVs different from the mean values available). Breeding adults´ HS was determined bya small range of values within those available, showing high specialization. Contrarily,wintering petrels showed higher plasticity in the selection of their foragingenvironments. The resulting HS maps of SGP in the present study also congregatesdifferent species of seabirds and marine mammals, which highlights the importance ofthe ACS for the conservation of the marine environment.