Emergent body size of mayfly survivors
Emergent body size of mayfly survivors
复制标题
DOI：
10.1111/j.1365-2427.2007.01880.x
复制
发表时间：
2008-01-01
影响因子：
2.7
通讯作者：
Culp, Joseph M.
中科院分区：
文献类型：
--
作者：
Alexander, Alexa C.;Heard, Kristie S.;Culp, Joseph M.
1.采用现场部署的围隔生态系统，我们研究了12小时脉冲和20天的压力（连续）曝光的常见农业杀虫剂，吡虫啉，若虫丰度，出现模式和成年人的身体大小的Epeorus属。（Heptageniidae）和Baetis spp.（Baetidae）. 2.在压力暴露下，若虫密度的降低是由于存活率的降低;在脉冲暴露下，若虫密度的降低可能反映了由于压力而增加的羽化率。一旦接触到吡虫啉，Epeorus和Baetis蜉蝣发展较少，出现比他们的控制同行更小。浓度低至0.1微克L-1（12小时脉冲）减少头部长度Baetis和胸部长度Epeorus。在所有的Baetis和Epeorus检查，影响只发现在男性。雄性的存活率和体型大小会影响种群动态。这种广泛应用的农业杀虫剂的亚致死剂量有可能降低蜉蝣种群的繁殖成功率。
1. Employing field-deployed mesocosms, we examined the effects of 12-h pulse and 20-day press (continuous) exposures of the common agricultural insecticide, imidacloprid, on nymph abundance, emergence patterns and adult body size of Epeorus spp. (Heptageniidae) and Baetis spp. (Baetidae).2. In press exposures, reduced nymph density was driven by reduced survivorship; in pulse exposures, reduced nymph density may reflect increased emergence because of stress.3. Once exposed to imidacloprid, Epeorus and Baetis mayflies developed less and emerged smaller than their control counterparts. Concentrations as low as 0.1 mu g L-1 (12-h pulse) reduced head length in Baetis and thorax length in Epeorus.4. In all of the Baetis and Epeorus examined, effects were only found in males. Male survivorship and body size can affect population dynamics. Sublethal doses of this widely applied agricultural insecticide have the potential to reduce reproductive success of mayfly populations.