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首页> 外文期刊>Chelonian conservation and biology >Factors Affecting Nesting Times in the Painted Turtle Chrysemys picta in Nebraska
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Factors Affecting Nesting Times in the Painted Turtle Chrysemys picta in Nebraska

机译：内布拉斯加州彩绘龟Chrysemys picta中影响筑巢时间的因素

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Although general descriptions of nesting in painted turtles (Chrysemys picta) are numerous, few studies have quantified the timing of the components of the nesting process, and no previous study has analyzed the factors influencing those times. The present study was conducted on the Crescent Lake National Wildlife Refuge in Garden County, Nebraska, in June 2012 and 2013 and focused on a single nesting population of female C. picta. We recorded times for the initiation of the nest foray, and the beginning and conclusion of nesting, and calculated search and construction times. Although highly variable, on average females left the marsh at 1709 hrs (n = 130), began nesting at 1745 hrs (n = 141), and finished nesting at 1915 hrs (n = 135). Search time averaged 26 min (n = 79) and nest construction time averaged 97 min (n = 104). We investigated the effects of female body size, air temperature, time of day, nest day, clutch number, substrate type, and reproductive output on these times. Smaller females nested earlier in the day, construction times were shorter in warmer temperatures, nests begun earlier in the day were completed more quickly, and nest times were longer earlier in the season and for first vs. second clutches. Soil type and measures of reproductive output had no effects on nesting times. These results suggest that temperature is a primary driver of nesting times, as these turtles exploit the afternoon-evening window of optimal temperatures, avoiding heat stress earlier in the afternoon and much colder evening temperatures as well as a presumed increase in predation risk after dark.
机译：尽管彩绘海龟（Chrysemys picta）筑巢的一般描述很多，但很少有研究量化筑巢过程的组成时间，并且以前没有研究分析影响这些时间的因素。本研究于2012年6月和2013年6月在内布拉斯加州加登县的新月湖国家野生动物保护区进行，研究的重点是雌性隐身C. picta的单巢种群。我们记录了筑巢开始，筑巢开始和结束的时间，并计算了搜索和建造时间。尽管变化很大，但平均而言，雌性在1709小时（n = 130）离开沼泽，在1745小时（n = 141）开始筑巢，并在1915小时（n = 135）完成筑巢。平均搜寻时间为26分钟（n = 79），筑巢时间平均为97分钟（n = 104）。我们调查了女性体重，气温，一天中的时间，巢日，离合器数量，底物类型和生殖产量对这些时间的影响。较小的雌性在当天早些时候筑巢，在较暖的温度下筑巢时间缩短，在一天中较早开始的筑巢更快完成，并且在第一季和第二季的交配期巢期更长。土壤类型和生殖产出措施对筑巢时间没有影响。这些结果表明温度是筑巢时间的主要驱动力，因为这些海龟利用了最佳温度的午后时段，避免了下午早些时候的热应激和较冷的晚上温度，以及天黑后掠食风险的增加。

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