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Demography of the Oregon spotted frog along a hydrologically modified river

机译：俄勒冈州俄勒冈州的人口统计学沿水文改良的河流

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Altered flow regimes can contribute to dissociation between life history strategies and environmental conditions, leading to reduced persistence reported for many wildlife populations inhabiting regulated rivers. The Oregon spotted frog (Rana pretiosa ) is a threatened species occurring in floodplains, ponds, and wetlands in the Pacific Northwest with a core range in Oregon, USA. All life stages ofR.?pretiosa are reliant on aquatic habitats, and inundation patterns across the phenological timeline can have implications for population success. We conducted capture–mark–recapture (CMR) sampling of adult and subadultR.?pretiosa at three sites along the Deschutes River downstream from two dams that regulate flows. We related the seasonal extent of inundated habitat at each site to monthly survival probabilities using a robust design CMR model. We also developed matrix projection models to simulate population dynamics into the future under current river flows. Monthly survival was strongly associated with the extent and variability of inundated habitat, suggesting some within‐season fluctuations at higher water levels could be beneficial. Seasonal survival was lowest in the winter for all three sites, owing to limited water availability and the greater number of months within this season relative to other seasons. Population growth for the two river‐connected sites was most strongly linked to adult survival, whereas population growth at the river‐disconnected site was most strongly tied to survival in juvenile stages. This research identifies population effects of seasonally limited water and highlights conservation potential of enhancing survival of particularly influential life stages.
机译：改变的流动制度可以促进生命历史策略和环境条件之间的解散，导致许多居住河流河流的许多野生动物种群报告的持久性降低。俄勒冈州斑点的青蛙（ rana pretosa）是在太平洋西北地区的洪水，池塘和湿地中发生的威胁物种，在美国俄勒冈州的核心范围。 R.?pretiosa的所有生命阶段都依赖于水生栖息地，并且对诸如纯粹的时间线上的淹没模式可能对人口成功产生影响。我们在沿着从调节流动的两个大坝下游的Deschutes河下游的三个地点进行了成人和亚群的捕获标记 - 重新捕获（CMR）抽样。我们将每个站点淹没栖息地的季节性范围与每月生存概率相关的CMR模型相关。我们还开发了矩阵投影模型，以模拟当前河流下的未来人口动态。每月存活率与淹没栖息地的程度和变异性强烈有关，建议在较高水平的季节内波动可能是有益的。所有三个地点的冬季季节性生存率最低，由于有限的水可用性和本赛季中的几个月相对于其他季节。两条河连接遗址的人口增长与成年人生存最强烈相关，而河流断开部位的人口增长最为强烈地依赖于少年阶段的生存。该研究确定了季节性有限的水的人口影响，并突出了提高特别影响寿命的生存的保护潜力。

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