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| | issg Database: Ecology of Sus scrofa |
 | | Pigs on the island were active at night mostly when conditions were warm and dry (Van Vuren 1984, in Wolf and Conover 2003). |
 | | Rooting by pigs disturbs the seed bank, reduces surface vegetation and alters the soil by increasing soil temperature, increasing or decreasing the nitrogen content, increasing oxidation and increasing the leaching of Ca, P, Zn, Cu and Mg (Kotanen 1994, Singer Swank and Clebsch 1984, Arrington, Toth and Koebel 1999, in Wolf and Conover 2003). |
 | | Unlike on Hawaii, on Santiago island the pigs do not have a negative impact on the native vegetation; this is due to the increased resistance of plants to generalised herbivores, in particular, the native giant tortoise (Colblentz Baber 1987, in Wolf and Conover 2003). |
| www.issg.org /database/species/ecology.asp?si=73&fr=1&sts= (2422 words) |
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