PARENT SESSION
Poster Session 3 / Sesion Carteles 3: Production Systems / Sistemas de Produccion
Thursday, January 12 / Jueves, 12 de Enero, 6:00 - 7:30 pm, Salon Yucatan, Lobby Level, Fiesta Americana
Does survival increase with patch size? Survival of forest dependent species in southern Costa Rica.
Ruiz-Gutierrez, Viviana*,1, Gavin, Thomas1, Cooch, Evan 1, 1 Cornell University, Ithaca, NY, USA
ABSTRACT- Past research on the effects of land conversion on wildlife populations largely used estimates of species abundance and diversity to determine the factors underlying species loss from forest fragments. The relationship between patch size and survival has not been the focus of most studies, since it requires extensive work on long-term data sets for the populations in question. Here, we have looked at survival for six forest bird species, varying in degree of forest dependency and mobility, in relation with the size of the forest patch were they were originally banded. The relationship is not significant (R=0.08), and hence suggests that there are other significant factors influencing survival of species in forest fragments other than size. One of these factors could be the type of antrhopogenic land use that surrounds the forest patches.
SPANISH ABSTRACT- Investigaciones previas sobre los efectos de cambios de uso de tierra sobre poblaciones silvestres se han concentrado en ĩndices de abundancia y diversidad de especies para determinar los factores detrãs de la perdida de especies de fragmentos de bosque. Es asĩ que la relaciõn entre tama&nover;o de parche de bosque y la sobrevivencia de poblaciones ha sido por su mayor parte ignorada, ya que requiere de un anãlisis extensivo de datos a largo plazo. En este trabajo, analizamos la sobrevivencia de seis especies de aves de bosque, representando una gradiente de dependencia de bosque y movilidad, en relaciõn con el tama&nover;o del parche de bosque donde fueron anilladas inicialmente. La relaciõn no muestra se significante, (R=0.08), y nos sugiere que posiblemente hay otros factores significantes que influyen sobre la sobrevivencia. Uno de estos factores puede ser el uso antropog&etilde;nico de tierra que rodea el parche de bosque.