Journal Article Antarctic fur seal Antarctica Georgia del Sur Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Review South Georgia approximate Bayesian computation biodiversity biotic homogenization bycatch captura accesoria captura comercial climate change commercial harvesting competencia por recursos connectivity contaminación marina cómputo bayesiano aproximado degradación de hábitat ecología histórica foca antártica green list habitat degradation historical ecology ice-free lista verde líneas base cambiantes marine pollution