All Insect Savanna Sweepnet Sampling 2004:Trophic Structure: Insect Species Diversity, Abundance and Body Size

The goal of this study was to examine the populations of insects in prairies and savannas. Most of the prairies had developed after being abandoned from agriculture, but none of the savannas had been cultivated. The history of burning varied between sites. The main sampling for this study was conducted in 1992 by the lead investigators: John Haarstad, Evan Siemann, and David Tilman. Insects were sampled via sweep-net sampling, pitfalls and ant scent plates throughout the growing season in each of 49 grassland fields and savannas. In total, 89,596 individuals of 1,167 species were captured and enumerated. Body size was measured for a subset of grasshoppers collected. In 2004, John Haarstad conducted two similar studies by identifying and enumerating all insects collected in sweepnet samples taken in old fields (prairies) as part of E014 grasshopper studies and from sweepnet samples taken in savannas.

本研究旨在探究草原（prairie）与稀树草原（savanna）中的昆虫种群。多数草原由农业用地撂荒后演替形成，而所有稀树草原均未被开垦过。各采样点的火烧历史存在差异。本研究的主要采样工作于1992年由项目负责人约翰·哈尔斯塔德（John Haarstad）、埃文·西曼（Evan Siemann）及大卫·蒂尔曼（David Tilman）完成。研究人员在49个草地样地与稀树草原样地内，于整个生长季采用扫网采样、地面陷阱诱捕及蚂蚁气味诱集板三种方式采集昆虫样本。本次采样共捕获并统计了1167个物种的89596头昆虫个体。研究人员对采集到的部分蝗虫样本开展了体型测量。2004年，约翰·哈尔斯塔德开展了两项同类研究：其一作为E014蝗虫研究项目的组成部分，对撂荒草地（草原）中的扫网采集样本进行昆虫种类鉴定与数量统计；其二对稀树草原中的扫网采集样本完成相同的鉴定与统计工作。