Hydrological, Environmental and Taxonomical Heterogeneity during the Transition from Drying to Flowing Conditions in a Mediterranean Intermittent River.

The MK test shows a negative trend in the monthly mean streamflow at 95% confidence level (Z = −2.08; S = −4641; p = 0.037) equivalent to 0.031 m 3 /s per year ( Figure 2 a).

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Instead, the zero flow days showed a positive trend at 90% confidence level (Z = 1.74; S = 148; p = 0.08), increasing with 3.5 days per year.

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Our findings revealed that a substantial reduction of the streamflow and a clear trend towards increasing zero flow days in the last decades in the Mediterranean climates could cause lost sensible species with low capability to migrate on the riverine ecosystems.

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