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首页> 外文期刊>International journal of river basin management >Challenges to barbel population resilience due to hydrological alteration
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Challenges to barbel population resilience due to hydrological alteration

机译：水文变化对口岸人口适应力的挑战

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This study aims to evaluate how the habitat of the Iberian barbel (Luciobarbus bocagei) has changed over the last nine decades in a reach of the River Duero in Toro (Zamora). The available physical habitat through different streamflows was quantified as the wetted area potentially usable by adult barbel with maximum preference (weighted usable area [WUA]). Historical time series of streamflows were used to generate a time series of habitat. Flow data were studied from 1912 to 2008, period being divided into three sub-periods. The sub-period 1912-1931 was considered as a natural regime of reference, and sub-periods 1942-1980 and 1981-2008 were altered. Data from 1931 to 1942 were missing. Uniform continuous under-threshold (UCUT) curves were developed for a set of WUA thresholds from 20% to 75% maximum WUA in the three different sub-periods. As Iberian barbel's life- history traits determine that habitat conditions become limiting during summer season, we have drawn UCUT curves using the values from July to September. In order to quantify the challenges to population resilience due to changes in habitat availability, an index of population fatigue was proposed (analogous to materials fatigue), which compares altered periods to natural one. This index was defined by the difference between the area that the UCUT curves in the altered and natural periods draw for each defined threshold and it is measured in days under thresholds. The index of population fatigue is calculated as an extension of Parasiewicz et al.'s (2012) concept of habitat stress days alteration, the HSDA, into an integrated HSDA (IHSDA). The greater the index value, the greater the alteration suffered. Results showed an increasing loss of habitat availability for common events related to natural conditions: 10 days for the first altered sub-period that became more evident (up to 18 days) in the last sub-period.
机译：这项研究的目的是评估在过去九个十年中，在托罗（萨莫拉）杜罗河（Rivero Duero）到达河的途中，伊比利亚通天河（Luciobarbus bocagei）的栖息地发生了怎样的变化。通过不同的水流可利用的自然栖息地被量化为成年杠铃可能以最大的偏好使用的湿润区域（加权可用面积[WUA]）。流的历史时间序列用于生成栖息地的时间序列。研究了1912年至2008年的流量数据，该时期分为三个子时段。子时期1912-1931被认为是自然的参照制度，子时期1942-1980和1981-2008发生了变化。从1931年到1942年的数据丢失了。针对三个不同子时段中最大WUA的20％至75％的一组WUA阈值，开发了统一的连续阈值下限（UCUT）曲线。由于伊比利亚通天的生活史特征决定了夏季的栖息地条件变得有限，我们使用7月至9月的值绘制了UCUT曲线。为了量化由于栖息地可利用性变化而对种群弹性造成的挑战，提出了种群疲劳指数（类似于物质疲劳），该指数将变化的时期与自然时期进行了比较。该指数由每个定义的阈值在UCUT曲线变化和自然周期绘制的面积之间的差异定义，并在阈值下以天为单位进行测量。人口疲劳指数的计算方法是Parasiewicz等人（2012）将栖息地压力天数变化的概念HSDA扩展为综合HSDA（IHSDA）。索引值越大，遭受的更改就越大。结果表明，与自然条件相关的常见事件的栖息地可用性丧失越来越大：第一个变化的子时期为10天，而在最后一个子时期则更为明显（最多18天）。

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