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首页> 外文期刊>Chelonian conservation and biology >A Test of Substrate Sweeping as a Strategy to Reduce Raccoon Predation of Freshwater Turtle Nests, with Insights from Supplemental Artificial Nests
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A Test of Substrate Sweeping as a Strategy to Reduce Raccoon Predation of Freshwater Turtle Nests, with Insights from Supplemental Artificial Nests

机译：底物清扫试验作为减少淡水龟巢中浣熊捕食的一种策略，来自补充人工巢的见解

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摘要

Visible sign produced by nesting turtles has been suggested to be a cue used by foraging raccoons (Procyon lotor) to locate nests. Experiments investigating the potential for reducing turtle nest predation by eliminating these surface markings by broom sweeping nesting areas were conducted at 2 Graptemys nesting sites along the lower Wisconsin River in Iowa County, Wisconsin, during 2013 and 2014. Ninety-five percent of the natural nests in unswept control areas (n = 20) and all of the nests in swept treatment areas (n = 16) were depredated by raccoons within 24 hrs. Supplemental artificial nests with refilled manufactured cavities but lacking potential olfactory turtle-or egg-related cues were also excavated by raccoons within similar time lines (97% within 24 hrs) and at high rates both when unswept (100%, n = 20) and when swept (95%, n = 19). However, artificial facsimiles of the surface markings left by nesting turtles, lacking cavities, were disturbed less frequently (26%, n = 19). Findings suggest that broom sweeping was ineffective because the location cues used by raccoons to find newly constructed nests are not primarily visual but olfactory and related to soil profile disturbance, possibly via the microbial metabolite geosmin.
机译：有人建议由筑巢的海龟产生的可见信号是觅食浣熊（普罗赛洛）（Procyon lotor）来寻找巢穴的线索。在2013年至2014年间，对位于威斯康星州爱荷华县下游威斯康星州河下游的2个Graptemys筑巢地点进行了实验研究，以通过扫帚扫掠筑巢区消除这些表面痕迹来减少海龟筑巢的可能性。百分之九十五的自然巢在未清扫的对照区域（n = 20）中，在清扫处理区域（n = 16）中的所有巢都在24小时内被浣熊淘汰。浣熊在相似的时间范围内（24小时内为97％）也以高比率开挖了补充了人工窝的人工巢，但它们缺乏潜在的与海龟或卵相关的嗅觉线索，并且在未清扫时（100％，n = 20）和扫描时（95％，n = 19）。但是，没有洞的筑巢乌龟留下的表面痕迹的人工传真受到的干扰较少（26％，n = 19）。研究结果表明扫帚扫地是无效的，因为浣熊用来寻找新筑巢的位置提示主要不是视觉而是嗅觉的，并且与土壤剖面扰动有关，可能是通过微生物代谢产物土臭味素引起的。

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