El cerdo cimarrón (Sus scrofa, Suidae) en la Isla del Coco, Costa Rica: Escarbaduras, alteraciones al suelo y erosión
Đã lưu trong:
| Tác giả: | |
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| Định dạng: | artículo |
| Ngày xuất bản: | 2001 |
| Miêu tả: | Feral pigs (Sus scrofa) are of the most damaging exotic vertebrates, specially on oceanic island nativecommunities. Feral pigs inhabit Cocos Island since 1793 and there are around 400-500 individuals. In order toquantify the impacts of the feral pigs at Cocos Island, I calculated the effect of the rooting activity and its influ-ence on the natural erosion. During one year I walked, monthly, 15 km on trails estimating rooted area by tran-sect and rooting recurrence. During eight months I compared erosion rates with and without rootings. I estimat-ed the annual rooting rate between 10 and 20 % of the total island surface. The rooted area was the only meas-ured variable which correlated with the soil erosion rate. The erosion rate without rootings was 23.6 kg/ha/yearand with rootings was 200.4 kg/ha/year (P < 0.01). The disturbances provoked by the rootings were not scatteredhomogeneously through the island. The rootings, together with the natural landslides, dominate the soil distur-bance pattern at Cocos Island. This study suggests that the presence of feral pigs produces more erosion than theone that would naturally occur without feral pigs at Cocos Island. |
| Quốc gia: | Repositorio UNA |
| Tổ chức giáo dục: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| Ngôn ngữ: | Inglés |
| OAI Identifier: | oai:https://repositorio.una.ac.cr:11056/23218 |
| Truy cập trực tuyến: | http://hdl.handle.net/11056/23218 |
| Access Level: | acceso abierto |
| Từ khóa: | COCOS ISLAND COSTA RICA EROSION EROSION RATES FERAL PIG ROOTING SOIL DISTURBANCES ISLA DEL COCO (COSTA RICA) EROSIÓN TASAS DE EROSIÓN CERDO FERAL ENRAIZAMIENTO ALTERACIONES DEL SUELO |