Intra‐ and Interhabitat Variations in Guazuma ulmifolia (Sterculiaceae) Seed Predation by Amblycerus Cistelinus (Bruchidae) in Costa Rica
Intra‐ and Interhabitat Variations in Guazuma ulmifolia (Sterculiaceae) Seed Predation by Amblycerus Cistelinus (Bruchidae) in Costa Rica
复制标题
哥斯达黎加 Amblycerus Cistelinus (Bruchidae) 捕食 Guazuma ulmifolia (Sterculiaceae) 种子的生境内和生境间变化
作者：
D. Janzen
在哥斯达黎加瓜纳卡斯特省从极度干燥的落叶到半常绿河岸潮湿森林的一系列逐渐干燥的栖息地中，金龟子对瓜子的捕食严重程度从12%到42%(每个地点平均有13-31个种子作物)。在一个地点内，每棵树的种子捕食率在最干燥的地点为2%-22%，在最潮湿的地点为7%-75%。这些极端范围强调，必须仔细评估单一种子作物的种子捕食记录，一种特定于宿主的捕食者对种子的捕食可能在不同生境之间有很大差异。在23,285个银杏果实中未检出苹果天牛寄生蜂。
The severity of seed predation on Guazuma ulmifolia (Sterculiaceae) by the beetle Amblycerus cistelinus (Bruchidae) ranges from 12% to 42% (averages of 13-31 seed crops at each site) in a series of progressively drier habitats ranging from extremely dry deciduous to semievergreen riparian moist forest in Guanacaste Province, Costa Rica. Within a site, the range of seed predation per individual tree's crop is from 2%-22% at the driest site, to 7%.-75% at the wettest site. These extreme ranges emphasize that seed predation records on single seed crops must be evaluated with care and that seed predation by one species of host-specific predator may vary strongly among habitats. No parasitoids of A. cistelinus were found in a total of 23,285 fruits of G. ulmifolia.