摘要
Arthropod communities were investigated in two Swedish semi-natural grasslands, each subject to two types of grazing regime: conventional grazing from May to September (continuous grazing) and traditional late management from mid-July (late grazing). Pitfall traps were used to investigate abundance of carabids, spiders, and ants over the grazing season. Ant abundance was also measured by mapping nest density during three successive years. Small spiders, carabids and ants (Myrmica spp.) were more abundant in continuous grazing than in late grazing while larger spiders, carabids, and ants (Formica spp.) were more abundant in late grazing. The overall abundance of carabids was higher in continuous grazing in the early summer but higher in late grazing in the late summer. The switch of preference from continuous to late grazing coincided with the time for larvae hibernating species replacing adult hibernating. We discuss possible explanations for the observed responses in terms of effects of grazing season on a number of habitat variables for example temperature, food resources, structure of vegetation, litter layer, competition, and disturbance.
摘要译文
节肢动物社区在两种瑞典半天然草地上进行了调查，每种瑞典半自然草原，每个类型的放牧制度：从5月到9月（持续放牧）和7月中旬的传统延迟管理的传统放牧（晚放牧）。陷阱陷阱用于研究放牧季节的丰富的漫画，蜘蛛和蚂蚁。还通过在连续三年内映射巢密度来测量蚂蚁丰度。小蜘蛛，漫画和蚂蚁（Myrmica SPP。）在连续放牧中比晚放牧更加丰富，而较大的蜘蛛，漫画和蚂蚁（Formica SPP。）在晚些时候较近放牧。在初夏在初夏的持续放牧中，漫画的总体丰富程度较高，但在夏末晚些时候放牧。从连续到晚期放牧的偏好切换恰逢幼虫冬眠物种取代成人冬眠的时间。我们讨论了在占据季节对许多栖息地变量的影响方面对观察到的反应的可能解释，例如温度，食品资源，植被，垃圾层，竞争和干扰。
Lisette Lenoir ; Tommy Lennartsson. Effects of Timing of Grazing on Arthropod Communities in Semi-Natural Grasslands[J]. Journal of Insect Science, 2010,10