The abundance of false killer whale, Pseudorca crassidens (Cetartiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica
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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2020
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| author | Erika Sánchez-Robledo |
| author_facet | Erika Sánchez-Robledo |
| contents | The abundance of false killer whale, Pseudorca crassidens (Cetartiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica Erika Sánchez-Robledo Lenin Oviedo David Herra-Miranda Juan D. Pacheco-Polanco Sierra Goodman Héctor M. Guzman Biología mark capture coastal seascape recapture Introduction: False killer whale (Pseudorca crassidens) is a tropical and subtropical social species that live in groups with individuals of mixed ages and sex classes. False killer whales have been documented since the late 1990s in Southwestern Costa Rica. Objective: To estimate the abundance of false killer whales in Osa Peninsula waters. Methods: Cetacean surveys off the Osa Peninsula Waters (OPW), Costa Rica, yielded opportunistic encounters with false killer whales in Drake Bay and Caño Island (2001-2019) and observations during formal surveys in Golfo Dulce (2005-2015). Photo-identification data was analyzed using capture-mark-recapture models in the study area, through an open population (POPAN) framework, considering the effect of time on the parameters apparent survival and capture probability, producing an abundance estimate for a superpopulation in the entire study area. Results: False killer whale abundance in OPW is characterized by a small population size of no more than 100 individuals, complemented by a very low probability of encounter and a contrasting high apparent survival. Conclusions: This population estimate should be taken as conservative, however, the small population size of less than 100 individuals should be considered vulnerable, in contrast to the increasing anthropogenic impacts in the coastal seascape. We argue the potential occurrence of population units along the coastal seascape of the Pacific littoral and oceanic island-associated units at Isla del Coco. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44965969018 https://www.redalyc.org/journal/449/44965969018/ https://www.redalyc.org/journal/449/44965969018/html/ https://www.redalyc.org/journal/449/44965969018/44965969018.epub https://www.redalyc.org/journal/449/44965969018/movil 10.15517/RBT.V68I2.37196 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.68 |
| format | Artículo científico |
| id | redalyc_44965969018 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Costa Rica |
| spellingShingle | The abundance of false killer whale, Pseudorca crassidens (Cetartiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica Erika Sánchez-Robledo Biología mark capture coastal seascape recapture The abundance of false killer whale, Pseudorca crassidens (Cetartiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica Erika Sánchez-Robledo Lenin Oviedo David Herra-Miranda Juan D. Pacheco-Polanco Sierra Goodman Héctor M. Guzman Biología mark capture coastal seascape recapture Introduction: False killer whale (Pseudorca crassidens) is a tropical and subtropical social species that live in groups with individuals of mixed ages and sex classes. False killer whales have been documented since the late 1990s in Southwestern Costa Rica. Objective: To estimate the abundance of false killer whales in Osa Peninsula waters. Methods: Cetacean surveys off the Osa Peninsula Waters (OPW), Costa Rica, yielded opportunistic encounters with false killer whales in Drake Bay and Caño Island (2001-2019) and observations during formal surveys in Golfo Dulce (2005-2015). Photo-identification data was analyzed using capture-mark-recapture models in the study area, through an open population (POPAN) framework, considering the effect of time on the parameters apparent survival and capture probability, producing an abundance estimate for a superpopulation in the entire study area. Results: False killer whale abundance in OPW is characterized by a small population size of no more than 100 individuals, complemented by a very low probability of encounter and a contrasting high apparent survival. Conclusions: This population estimate should be taken as conservative, however, the small population size of less than 100 individuals should be considered vulnerable, in contrast to the increasing anthropogenic impacts in the coastal seascape. We argue the potential occurrence of population units along the coastal seascape of the Pacific littoral and oceanic island-associated units at Isla del Coco. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44965969018 https://www.redalyc.org/journal/449/44965969018/ https://www.redalyc.org/journal/449/44965969018/html/ https://www.redalyc.org/journal/449/44965969018/44965969018.epub https://www.redalyc.org/journal/449/44965969018/movil 10.15517/RBT.V68I2.37196 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.68 |
| title | The abundance of false killer whale, Pseudorca crassidens (Cetartiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica |
| topic | Biología mark capture coastal seascape recapture |
| url | https://www.redalyc.org/articulo.oa?id=44965969018 https://www.redalyc.org/journal/449/44965969018/ https://www.redalyc.org/journal/449/44965969018/html/ https://www.redalyc.org/journal/449/44965969018/44965969018.epub https://www.redalyc.org/journal/449/44965969018/movil |