| Signatura:||Biblioteca OET: S5221. Biblioteca OET: NBINA-10887. |
| Autor:|| Steyermark, Anthony C; Williams, Kristina; Spotila, James R; Paladino, Frank V; Rostal, David C; Morreale, Stephen J; Koberg, María Teresa; Arauz-Vargas, Randall. |
| Dirección:|| Drexel University, Department of Biosciences & Biotechnology, Philadelphia, PA 19104, US E-mail: firstname.lastname@example.org E-mail: email@example.com E-mail: firstname.lastname@example.org E-mail: email@example.com E-mail: firstname.lastname@example.org. |
| Título: ||
Nesting leatherback turtles at Las Baulas National Park, Costa Rica. Anidamiento de las tortugas baula en el Parque Nacional Marino Las Baulas, Costa Rica. |
| P.imprenta: || v. 2, no. 2, p. 173-183. Año 1996. |
| Serie: ||Chelonian Conservation and Biology. |
| Descriptores:|| ANIMALS; CHORDATES; VERTEBRATES; REPTILES; TESTUDINATA; CRYPTODIRA; ANAPSIDA. |
DERMOCHELYIDAE; DERMOCHELYS CORIACEA; LEATHERBACK TURTLE; NESTING; TAGGING; CARAPACE LENGTH; CLUTCH FREQUENCY; TEMPERATURE; POPULATION SIZE; WILDLIFE MANAGEMENT; TURTLES; NEST; CONSERVATION; MANAGEMENT; SURVEYING; COASTAL HABITAT; COMMERCIAL FISHING; ENVIRONMENTAL FACTORS; EL NI&NTILDE;O SOUTHERN OSCILLATION; MORTALITY; DISTURBANCE BY MAN; URBAN DEVELOPMENT; POSSIBLE ROLE IN POPULATION DECLINE; TAGGING; TAG LOSS RATE ASSESSMENT; NEST LOCATION; OVIPOSITION; INTERNESTING INTERVAL; EGG NUMBER; BREEDING SITE; POPULATION DYNAMICS; ENSO.
COSTA RICA; CENTRAL AMERICA; PACIFIC OCEAN.
AREA DE CONSERVACION TEMPISQUE; PARQUE NACIONAL MARINO LAS BAULAS.
| Resumen: ||Las Baulas National Park on the Pacific coast of Costa Rica includes three beaches, Playa Grande, Playa Langosta, and Playa Ventanas, that support a major nesting colony of leatherback turtles, Dermochelys coriacea. During the 1993-94 nesting season,we tagged 159 individuals with inconel tags, and 154 of these with PIT tags also. During the 1994-95 season, we tagged 462 individuals with inconel tags, and 459 of these with PIT tags also. Documented inconel flipper tag loss (10%, 1993-94; 7.4%, 1994-95) was high given the short time span of this study (November to February). In contrast, apparent loss rate of PIT tags was 3.1% in 1993-94 and 3.3% in 1994-95. Las Baulas leatherbacks were smaller than leatherbacks reported from nesting beaches outside the east Pacific area. Mean standard curved carapace length (SCCL) was 144.4 cm in 1993-94 and 147.6 cm in 1994-95. Modal internesting period was 9 days. Mean observed clutch frequency was 3.6 for the 1993-94 season and 3.5 for the 1994-95 season. Mean estimated clutch frequency was 5.1 for 1993-94 season and 4.9 for the 1994-95 season. Estimated clutch frequency was higher than observed for both seasons due to incomplete beach coverage and possibly to lack of beach philopatry. An estimated 1600 leatherbacks previously nested at Playa Grande during each of the 1988-89 and 1989-90 seasons. We estimated 202 nesting leatherbacks in 1993-94 and 469 in 1994-95. The decline in the 1993-94 season and the ensuing increase in 1994-95 in numbers of leatherbacks at Las Baulas was correlated with changes in mean sea surface temperatures in the equatorial Pacific Ocean region (El Niño). The decline in numbers of leatherbacks at Las Baulas since the high years of 1988-89 may be due to the recent increase in development in the area surrounding nesting beaches, as well as incidental catch of leatherbacks in offshore fisheries|