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首页> 外文期刊>Canadian Journal of Zoology >Hydrological stability and otter trophic diversity: a scale-insensitive pattern?
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Hydrological stability and otter trophic diversity: a scale-insensitive pattern?

机译：水文稳定性和水族营养多样性：对规模不敏感的模式？

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摘要

Two recent works related Eurasian otter (Lutra lutra (L., 1758)) trophic patterns over large areas with the stability of aquatic ecosystems. Higher levels of instability lead to reduced availability and (or) predictability of fish, and consequently, to a decrease in fish consumption by otters. The aim of the present study is to test these macrogeographical patterns in otter diet at regional and local scales. We analysed otter diet in Mediterranean streams in southwestern Iberian Peninsula where clear hydrological stability gradients (related to drainage area or distance to the sea) could be defined. Hydrological stability was directly related to fish consumption and inversely to otter diet diversity in terms of occurrence and biomass, both at regional and local scales. The level of stability of aquatic ecosystems appears to be a critical indirect factor that modulates otter diet through its effects on fish populations. The resulting trophic patterns are maintained from local to macrogeographical scales.
机译：最近的两篇有关水生生态系统稳定的大面积欧亚水獭（Lutra lutra（L.，1758））的营养模式。更高水平的不稳定性导致鱼类的供应减少和（或）可预测性降低，从而导致水獭的鱼类消费减少。本研究的目的是在区域和地方尺度上测试水獭饮食中的这些宏观地理格局。我们分析了伊比利亚半岛西南部地中海河流中的水獭饮食，在那里可以定义明确的水文稳定性梯度（与流域或海洋距离有关）。在区域和地方尺度上，水文稳定性与鱼类消费直接相关，而与水獭日粮多样性的发生和生物量成反比。水生生态系统的稳定水平似乎是通过影响水獭饮食对鱼类种群的调节而发挥作用的关键间接因素。从局部到宏观地理尺度维持所得的营养模式。

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