INVESTIGADORES
YORIO Pablo Martin
congresos y reuniones científicas
Título:
Foraging areas of Cayenne, Royal and South American Terns breeding in northern Patagonia, Argentina
Autor/es:
GATTO, A.; YORIO, P.; DOLDÁN, M. S.; VILLANUEVA GOMILA, L.; CABRAL, K.
Lugar:
Campos do Jordao
Reunión:
Congreso; 25th International Ornithological Congress; 2010
Resumen:
Cayenne
(Thalasseus sandvicensis eurygnathus),
royal (Thalasseus maximus) and South
American terns (Sterna hirundinacea)
breed sympatrically in Patagonia,
Argentina. Very
little is known on the breeding foraging areas and feeding patterns of these
species and thus studies are needed to understand their role in coastal
ecosystems and develop adequate management strategies. We present information
on the use of foraging areas by these species at a mixed species colony in the
Punta León Protected Area (43º 04
S, 64º 29
W), and in the Punta Loma Protected Area (42° 49 S, 64° 53 W), Chubut, Argentina.
Radio-transmitters were deployed on eight nesting adults of each species, which
were tracked during the late incubation. Feeding areas were identified during
foraging trips by means of radio-telemetry from the coast, using two fixed
tracking stations for each colony, consisting each of two attached 9-element
Yagi antennae. Terns foraged mostly between the colony and the first 15 km from the coast, and 35 km away from the colony.
However, lack of signal reception in some of these trips, indicate that
foraging can also take place in waters further away. In general, individual
birds were consistent in the use of one particular area. Implications for
foraging area partitioning between terns and the coastal management and
conservation guidelines will be discussed.