Species Diversity and Abundance in Insular Systems

《岛屿系统中的物种多样性和丰富性》DEB 9981912T.W.舍纳和D.A.斯皮勒，PIS这项研究继续研究食物网，即指定生态群落中哪些物种吃哪些物种的关系。我们模拟了一种大型捕食者入侵拥有各种小型捕食者以及草食动物和植物的岛屿。这种捕食者不仅可能通过消耗产生深远的直接影响，而且通过介入性物种，可以间接影响包括植物在内的其他成分。这种间接影响可能是积极的，也可能是消极的：例如，大型捕食者可能会吃掉吃植物的昆虫(积极)，或者小型捕食者可能会吃掉以植物为食的昆虫(消极)。除了数量上的变化外，还研究了受影响物种的行为和形态的变化。这项实验是在一个岛屿系统内进行的，其中许多岛屿近20年来一直在监测自然入侵和灭绝。计划中的监测包括广泛记录最近的飓风弗洛伊德造成的破坏和恢复情况，这是一场毁灭性的4级风暴。这一项目的结果将大大加强我们对大的自然干扰如何影响生态系统动态的理解。

"Species Diversity and Abundance in Insular Systems"DEB 9981912T.W. Schoener and D.A. Spiller, PIsThis research continues a study of food webs, relations that specify which species eat which in an ecological community. We simulate invasion of a large predator onto islands having a variety of small predators as well as herbivores and plants. Such predators may not only exert profound direct effects by consumption, but via intervening species, can indirectly affect other components, including plants. Such indirect effects may be positive or negative: e.g., the large predator may consume insects that eat plants (positive), or consume small predators that eat the plant-eating insects (negative). In addition to changes in numbers, changes in behavior and morphology of affected species are studied. The experiment is performed within a system of islands, many of which have been monitored for natural invasions and extinctions for nearly two decades. Planned monitoring includes extensive documentation of damage and recovery from the recent Hurricane Floyd, a devastating, Category 4 storm. Results of this project should significantly enhance our understanding of how large natural disturbances affect the dynamics of ecological systems.