Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru
Strandings and incidental catches of four sea turtles species (Chelonia mydas, Lepidochelys olivacea, Dermochelys coriacea and Eretmochelys imbricata) were registered in Tumbes Region since August 2007 to August 2009. These registers (52.6% of strandings and 47.4% of incidental catches) occurred during all year; most frequently in Punta Picos (50.5%), Canoas (20.0%) and Baja de Punta Mero (14.7%). The most registered species were C. mydas (64.2%) and L. olivacea (30.5%); their sizes did not present significant differences between areas and climatic seasons. The higher percentage of C. mydas, L. olivacea and D. coriacea were considered sub-adults, including the only specimen of E. imbricata. The incidental catches were made with gillnets of different mesh sizes, but 8 inches mesh was most frequently. A high proportions of specimens were died with signs of drowning (22.2%) this was due to the prolonged time of soak time of gillnet (approximately 12 hours). No significant differences in CPUE were found between climatic seasons and no seasonal pattern was evident. Lesions in 14% of stranded specimens were caused possibly by human attacks or by collisions with fishing boats. 77.8% of incidental catch specimens were sacrificed for the commercialization of his meat, and sometimes of his shell, this shows the lack of awareness of conservation. These observations indicate that the coast of Tumbes is an important foraging area and development of sub-adult specimens of sea turtles; so it is recomend to develop monitoring, awareness and critical areas protection programs to foment the conservation of these organisms in the Eastern Pacific.
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Universidad Nacional Mayor de San Marcos, Facultad de Ciencias Biológicas
2010
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Rosales, Carlos A. Vera, Manuel Llanos, Jorge |
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Rosales, Carlos A. Vera, Manuel Llanos, Jorge Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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Rosales, Carlos A. Vera, Manuel Llanos, Jorge |
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Rosales, Carlos A. |
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Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru |
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stranding and incidental catch of sea turtles in the coastal tumbes, peru |
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Strandings and incidental catches of four sea turtles species (Chelonia mydas, Lepidochelys olivacea, Dermochelys coriacea and Eretmochelys imbricata) were registered in Tumbes Region since August 2007 to August 2009. These registers (52.6% of strandings and 47.4% of incidental catches) occurred during all year; most frequently in Punta Picos (50.5%), Canoas (20.0%) and Baja de Punta Mero (14.7%). The most registered species were C. mydas (64.2%) and L. olivacea (30.5%); their sizes did not present significant differences between areas and climatic seasons. The higher percentage of C. mydas, L. olivacea and D. coriacea were considered sub-adults, including the only specimen of E. imbricata. The incidental catches were made with gillnets of different mesh sizes, but 8 inches mesh was most frequently. A high proportions of specimens were died with signs of drowning (22.2%) this was due to the prolonged time of soak time of gillnet (approximately 12 hours). No significant differences in CPUE were found between climatic seasons and no seasonal pattern was evident. Lesions in 14% of stranded specimens were caused possibly by human attacks or by collisions with fishing boats. 77.8% of incidental catch specimens were sacrificed for the commercialization of his meat, and sometimes of his shell, this shows the lack of awareness of conservation. These observations indicate that the coast of Tumbes is an important foraging area and development of sub-adult specimens of sea turtles; so it is recomend to develop monitoring, awareness and critical areas protection programs to foment the conservation of these organisms in the Eastern Pacific. |
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Universidad Nacional Mayor de San Marcos, Facultad de Ciencias Biológicas |
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2010 |
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https://revistasinvestigacion.unmsm.edu.pe/index.php/rpb/article/view/4 |
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oai:ojs.csi.unmsm:article42020-05-21T21:07:52Z Stranding and incidental catch of sea turtles in the coastal Tumbes, Peru Varamientos y captura incidental de tortugas marinas en el litoral de Tumbes, Perú Rosales, Carlos A. Vera, Manuel Llanos, Jorge Tortuga verde Tortuga olivácea Tortuga dorso de cuero Tortuga carey Pacífico Oriental Tropical. Green sea turtle Olive Ridley Leatherback turtle Hawksbill turtle Tropical Eastern Pacific. Strandings and incidental catches of four sea turtles species (Chelonia mydas, Lepidochelys olivacea, Dermochelys coriacea and Eretmochelys imbricata) were registered in Tumbes Region since August 2007 to August 2009. These registers (52.6% of strandings and 47.4% of incidental catches) occurred during all year; most frequently in Punta Picos (50.5%), Canoas (20.0%) and Baja de Punta Mero (14.7%). The most registered species were C. mydas (64.2%) and L. olivacea (30.5%); their sizes did not present significant differences between areas and climatic seasons. The higher percentage of C. mydas, L. olivacea and D. coriacea were considered sub-adults, including the only specimen of E. imbricata. The incidental catches were made with gillnets of different mesh sizes, but 8 inches mesh was most frequently. A high proportions of specimens were died with signs of drowning (22.2%) this was due to the prolonged time of soak time of gillnet (approximately 12 hours). No significant differences in CPUE were found between climatic seasons and no seasonal pattern was evident. Lesions in 14% of stranded specimens were caused possibly by human attacks or by collisions with fishing boats. 77.8% of incidental catch specimens were sacrificed for the commercialization of his meat, and sometimes of his shell, this shows the lack of awareness of conservation. These observations indicate that the coast of Tumbes is an important foraging area and development of sub-adult specimens of sea turtles; so it is recomend to develop monitoring, awareness and critical areas protection programs to foment the conservation of these organisms in the Eastern Pacific. Entre agosto de 2007 y agosto de 2009 se registraron varamientos y capturas incidentales de cuatro especies de tortugas marinas (Chelonia mydas, Lepidochelys olivacea, Dermochelys coriacea y Eretmochelys imbricata) en la Región Tumbes, norte del Perú. Estos registros (52,6% de varamientos y 47,4% de capturas incidentales) ocurrieron todo el año, principalmente en Punta Picos (50,5%), Canoas (20,0%) y Baja de Punta Mero (14,7%). Las especies más abundantes fueron C. mydas (64,2%) y L. olivacea (30,5%), cuyas tallas no presentaron diferencias significativas entre zonas ni entre épocas climáticas. El mayor porcentaje de ejemplares de C. mydas, L. olivacea y D. coriacea se consideraron sub-adultos, incluyendo el único ejemplar de E. imbricata. Todas las capturas incidentales fueron realizadas con redes de enmalle de diferentes tamaños de malla, pero la de mayor frecuencia fue de 8 pulgadas. El alto porcentaje de ejemplares encontrados muertos con signos de ahogamiento (22,2%) se debió al prolongado tiempo de calado (aproximadamente 12 horas). No se encontraron diferencias significativas de CPUE entre épocas climáticas y no fue evidente ningún patrón estacional. El 14% de ejemplares varados presentaron lesiones causadas posiblemente por ataques humanos o por colisión con embarcaciones pesqueras. El 77,8% de ejemplares capturados incidentalmente fueron sacrificados para la comercialización de su carne, y en algunas ocasiones de su caparazón, lo que evidenció la falta de conciencia conservacionista. Estas observaciones indican que el litoral de Tumbes es una importante zona de forrajeo y desarrollo de ejemplares sub-adultos de tortugas marinas, por lo que recomendamos el desarrollo de programas de monitoreo, concienciación y de protección de zonas críticas para lograr la conservación de estos organismos en el Pacífico Oriental. Universidad Nacional Mayor de San Marcos, Facultad de Ciencias Biológicas 2010-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article info:eu-repo/semantics/article application/pdf https://revistasinvestigacion.unmsm.edu.pe/index.php/rpb/article/view/4 10.15381/rpb.v17i3.4 Revista Peruana de Biología; Vol. 17 No. 3 (2010); 293 - 301 Revista Peruana de Biología; Vol. 17 Núm. 3 (2010); 293 - 301 1727-9933 1561-0837 spa https://revistasinvestigacion.unmsm.edu.pe/index.php/rpb/article/view/4/4 Derechos de autor 2010 Carlos A. Rosales, Manuel Vera, Jorge Llanos https://creativecommons.org/licenses/by-nc-sa/4.0 |