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Movements, habitat use, and demography of Western Pond Turtles in an intermittent central California stream.

机译:加利福尼亚中部断断续续的溪流中西塘海龟的活动,栖息地利用和人口统计学。

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摘要

Western Pond Turtles, Emys (Actinemys) marmorata, were captured (n=173) in 2011 (wet year) and 2012--2013 (successively drier drought years) along upper Coyote Creek, an intermittent stream in central California. Males outnumbered females 2.8:1, juveniles less than 120 mm long made up 26% of captures, growth rates varied among individuals, and little growth occurred in turtles older than 10 years. I radio-tracked turtles from May 2011 through August 2013 to ascertain movements and seasonal habitat use. Males had much larger home ranges than females (means of 2281 m for males and 501 m for females in 2012), and males moved extensively in April and May, during the apparent breeding season. Turtles preferred deep and complex pools, complex runs, and backwaters. Turtles left the stream for upland habitats in late spring and summer as stream flow ceased and pool connectivity was broken. There was substantial variation in departure dates among individuals and between wetter and drier reaches. Mean departure date was 16 August in 2011, but decreased to 20 July in 2012 and 28 June in 2013, as the drought intensified. Upland sites were mostly within 100 m of the stream, beneath dried leaves and/or thatch, and on slopes varying from flat to over 40%. Turtles remained upland for almost seven months in 2011--2012, although there was much variation. Mean return to stream dates were 27 February (males) and 16 March (females).
机译:西部池塘海龟(Eyys(Actinemys)marmorata)于2011年(湿润年)和2012--2013年(干旱持续干旱)被捕获(位于中部加利福尼亚州的断断续续的溪流上游)。雄性比雌性2.8:1多,小于120毫米长的幼体占捕获的26%,个体间的生长率各不相同,而10岁以上的乌龟几乎没有生长。我从2011年5月至2013年8月对乌龟进行了无线电跟踪,以确定活动和季节性栖息地的使用情况。雄性的家畜范围比雌性要大得多(2012年,雄性个体为2281 m,雌性为501 m),并且在明显的繁殖季节中,雄性在4月和5月大量移动。龟更喜欢深而复杂的水池,复杂的河道和死水。春末夏初,由于溪流停止流动和水池连通性中断,海龟将溪流留给了高地栖息地。个体之间以及较干燥和较干燥的时间之间的出发日期有很大差异。平均出发日期为2011年8月16日,但由于干旱加剧,平均出发日期降至2012年7月20日和2013年6月28日。高地通常位于河流100 m以内,在干燥的叶子和/或茅草下面,坡度从平坦到40%以上不等。尽管变化很大,但海龟在2011--2012年仍在高地上呆了近七个月。平均重播日期为2月27日(男性)和3月16日(女性)。

著录项

  • 作者

    Belli, Joseph P.;

  • 作者单位

    San Jose State University.;

  • 授予单位 San Jose State University.;
  • 学科 Conservation biology.;Ecology.
  • 学位 M.S.
  • 年度 2016
  • 页码 110 p.
  • 总页数 110
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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