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首页> 美国卫生研究院文献>Insects >Aggregation Site Choice by Gregarious Nymphs of the Desert Locust Schistocerca gregaria in the Sahara Desert of Mauritania
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Aggregation Site Choice by Gregarious Nymphs of the Desert Locust Schistocerca gregaria in the Sahara Desert of Mauritania

机译：毛里塔尼亚撒哈拉沙漠中的沙漠蝗虫（Shistocerca gregaria）的群居若虫聚集地选择

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Animals often aggregate at certain sites during vulnerable periods such as night-roosting as an anti-predatory strategy. Some migratory gregarious animals must regularly find new night-roosting sites, but how they synchronously choose such sites is poorly understood. We examined how gregarious nymphs of the desert locust, Schistocerca gregaria Forskål (Orthoptera: Acrididae), aggregate at certain plants for night-roosting in the Sahara Desert. Migratory bands of last instar nymphs climbed trees around dusk and roosted there overnight. A spatial autocorrelation analysis of plants indicated that the larger locust groups formed at the larger plants within the local plant community. Other large groups were not formed near the large tree, but smaller groups were patchily distributed. Plant height was the primary cue used by migratory bands to choose night-roosting plants. A nearest-neighbor distance analysis showed that single conspicuous large trees with scattered smaller plants were distributed locally. This plant community structure and negative geotactic ascending behavior of gregarious nymphs may force them to concentrate at the landmark plant from all directions and afar. This plant-size-dependent roosting site choice may contribute for developing artificial trapping systems for locusts and inciting to a new environment-friendly night control approach.
机译：动物经常在脆弱时期聚集在某些地点，例如夜间栖息作为一种反掠夺性策略。一些迁徙性的群居动物必须定期寻找新的栖息地，但是人们对它们如何同步选择这样的场所却知之甚少。我们检查了沙漠蝗虫（Schistocerca gregariaForskål）的群居若虫（直翅目：Ac科）如何聚集在撒哈拉沙漠的某些植物中进行夜栖。末代若虫若虫的迁徙带在黄昏时分爬树，并在此栖息过夜。植物的空间自相关分析表明，蝗虫大群在当地植物群落内的较大植物上形成。在大树附近没有形成其他大的群体，但是较小的群体是零星分布的。植物高度是迁徙带选择夜栖植物的主要线索。最近邻距离分析表明，单个显着的大树和散落的小植物分布在本地。群居若虫的这种植物群落结构和负面的地势上升行为可能迫使它们从各个方向和远处集中在标志性植物上。这种取决于植物大小的栖息地选择可能有助于开发蝗虫的人工诱捕系统，并激发一种新的环境友好型夜间控制方法。

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