此物种详细信息 Savannas Preserve State Park
来源： Engeman et al. 2004b
In January 2003 the estimated damage to the exposed portion of a basin marsh system in Savannas Preserve State Park (SPSP) was estimated at 19% (an area of 5 hectares). The SPSP implemented a contract for swine control through out 2003 in all areas of the park. The damage was re-estimated in January 2004 and found to be significantly reduced with 31% of the sampling transects shoeing damage versus 92% in January 2003. Benefits of swine removal are very high relative to the costs of control. A year of swine control efforts was highly effective at reducing the rate of damage to the marsh reduced from 5.0 hectares to 0.95 hectares.
SPSP might be considered a viable candidate for swine eradication based on the criteria set forth by Bomford and O’Brien (1995) for successful eradication. SPSP is completely encapsulated in suburban development, making natural immigration unlikely. Through damage and spoor, swine populations in the Park’s habitats are detectable and can be indexed after severe population reductions (Engeman et al. 2001, 2003). Potentially reproductive females comprised the largest subset of the swine removed (24 of 64, 37.5%), indicating high risk to these animals from the control methods. This, combined with a lack of immigration, suggests that animal removal would exceed population increases at all densities. Despite potentially satisfying sufficient of the criteria set out by Bomford and O’Brien (1995) for eradication, the length of time and the concomitant funding needed for complete swine removal from SPSP are uncertain, as is the future availability of funds to complete such an endeavour. Undoubtedly, the cost per swine removed would increase as the population nears eradication. Therefore, significant population and damage reductions were the aims of the control effort, with eradication a desirable outcome if it occurs.
Seemingly low levels of swine damage to a habitat can still represent a major economic cost (Engeman et al. 2003). This case study shows that a relatively quick positive impact is seen in a rare Florida habitat from feral swine control, and shows that the benefits of the control are extremely high in comparison to the costs of the control.
Basin marshes are dwindling ecosystems in Florida that are especially vulnerable to damage by feral swine. As with many currently rare habitats the once extensive basin marsh system in Florida has been lost to development and the relatively small remainder found in SPSP has been heavily damaged by swine prior to swine control and removal.
最后修改 ： 24/07/2006 3:28:50 p.m.