CRB: Survival of Migrant Tropical Butter-Flies in Fragmented Forest

9400011史蒂文森移民是热带地区一种广为人知但知之甚少的现象。在制定保护计划时，需要特别考虑迁徙的物种，因为它们至少依赖两个季节性栖息地，而且它们可能依赖中途停留地点的资源，从而允许迁徙路径。近日，哥斯达黎加蒙特韦尔德附近山区的蝴蝶由东向西迁徙。令人惊讶的是，很大一部分(约80%)(260种)现存的太平洋斜坡和低地动物会季节性地迁往大西洋一侧。我们将量化蒙特韦尔德地区移民的数量、方向和时间构成。将在整个迁徙路线上研究四个重点物种的种群水平和当地资源的变化。生活史、形态和生理特征的比较将被用来对物种的栖息地专门化和迁徙能力进行排名。还将对迁徙和干燥森林的居民进行比较，以检查他们对栖息地碎片化的相对敏感性。哥斯达黎加其他地区的调查将为蝴蝶迁徙提供广阔的地理视角。这些研究将共同推进热带无脊椎动物的保护，并提高我们识别迁徙物种独特资源需求的能力。

9400011 Stevenson Migration is a widely recognized but poorly understood phenomenon in the tropics. Species that migrate need special consideration when developing conservation plans because they depend on at least two seasonal habitats and they may rely on resources at stopover sites allow the migration paths. Recently the east-west migration of butterflies over the mountains near Monteverde, Costa Rica. A surprising large fraction, approximately 80% (260 species), of the extant Pacific slope and lowland fauna move seasonally to the Atlantic side. We will quantify the magnitude, direction and temporal components of migrants in the Monteverde region. Changes in population levels and local resources of four focal species will be studied along the entire migration route. A comparison of life-history, morphological, and physiological traits will be used to rank habitat specialization and the migration capability of species. Comparisons will also be made between migrants and residents of the dry forest to examine their relative sensitivities to habitat fragmentation. A broad geographic perspective on butterfly migration will be provided by surveys in other parts of Costa Rica. Together these studies will advance the conservation of tropical invertebrates and increase our ability to identify the unique resource needs of migrant species.