HARVESTING AND EXTINCTION IN MULTI-SPECIES ECOSYSTEMS
作者单位：University Miami USA
会议名称：《第三世界生态高峰会》
会议日期：2007年
学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学]
摘 要：A potential cost of harvesting in multi-species ecosystems is that it might cause nonharvested species at the same trophic level to go *** analytical models are not well-suited for studying this harvest externality because they focus on species interactions across trophic levels instead of within *** identify the conditions under which the harvesting of one species causes at least one extinction of a nonharvested species at the same trophic level. We compare two harvest regimes:uniform management,in which an optimal harvest rate is applied to the entire ecosystem;arid specialized management,in which a portion of the ecosystem is converted to a monoculture and the rest is left *** regime is more likely to result in extinction depends on the discount rate,net harvest prices under the two regimes,and the harvested species s competitive ability and colonization rate compared to those of the other species