CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Density-dependent changes in the distribution of southern right whales (Eubalaena australis) in the breeding ground Peninsula Valdés.
Autor/es:
ARIAS MAGDALENA; CRESPO ENRIQUE ALBERTO; COSCARELLA MARIANO ALBERTO; SUEYRO NICOLÁS
Lugar:
Blend
Reunión:
Encuentro; International Whaling Comission - Scientific Committee; 67B/2018; 2018
Institución organizadora:
International Whaling Commission
Resumen:
Southern Right Whales (Eubalaena australis) is experiencing a population growth in the South-western Atlantic Ocean. In the breeding ground of Peninsula Valdés, as a consequence of the population increase, expansion to new areas and a change in the habitat use of the coastal area were recorded. Also, as a consequence of population increase changes in distribution and density in the core area are suspected. We analyzed information that was gathered from aerial surveys developed along the coast of Peninsula Valdés for 19 years. These surveys were divided into 4 periods. A geographical analysis of 620 km of coast revealed that in 5 km-length segments the density of whales increased to a maximum near to 3 whales per km2. This figure is proposed as a threshold that elicits a density dependence response, where the Mother-calf pairs remain in the area, while the other groups decreased their density, forcing them to move to other areas.