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Notes on the Nest Predation Dynamics of Graptemys at Two Wisconsin Sites Using Trail Camera Monitoring

机译:关于使用追踪相机监控在两个威斯康星州站点的食人鱼的巢捕食动力学的注意事项

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摘要

Incidental observations on nest predation dynamics at 2 map turtle (Graptemys spp.) nesting sites along the Wisconsin River, Iowa County, Wisconsin, were obtained during primary research on the use of electric fencing to decrease turtle nest predation. Sites were continuously monitored by digital trail cameras during the 2008-2011 reproductive seasons. Raccoons (Procyon lotor) displayed temporally focused turtle nest foraging efforts across both sites and years and were the only confirmed nest predators. Striped skunks (Mephitis mephitis), Virginia opossums (Didelphis virginiana), coyotes (Canis latrans), and American crows (Corvus brachyrhynchos) were less frequent on site but also displayed recurring seasonal chronologies. Nest predation levels exceeded 90%, with short nest survival timelines suggesting relatively high predation pressures on these sites. Available data provided only limited evidence that post-nest construction rainfall reduced nest predation rates.
机译:在对使用电子围栏减少龟巢捕食的初步研究期间,获得了沿威斯康星州爱荷华县威斯康星河沿岸的两个地图龟(Graptemys spp。)筑巢点的巢捕食动力学的偶然观察结果。在2008-2011繁殖季节,用数码后视摄像机连续监测现场。浣熊(Procyon lotor)显示了在时间和地点上都集中在时间上的龟巢觅食工作,并且是唯一被确认的巢穴掠食者。条纹臭鼬(Mephitis mephitis),弗吉尼亚负鼠(Didelphis virginiana),郊狼(Canis latrans)和美洲乌鸦(Corvus brachyrhynchos)在现场的频率较低,但也表现出周期性的季节性变化。巢捕食水平超过90%,巢生存时间短表明这些地点的捕食压力相对较高。现有数据仅提供了有限的证据,表明筑巢后的降雨减少了巢穴的捕食率。

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