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首页> 外文期刊>Lakes & Reservoirs >Contrasting effects of water stress on wetland-obligated birds in a semi-natural Mediterranean wetland
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Contrasting effects of water stress on wetland-obligated birds in a semi-natural Mediterranean wetland

机译：水分胁迫对半天然地中海湿地中湿地鸟类的影响

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This study evaluated the effects of seasonal water level changes on two foraging guilds of water-related bird species in a remnant coastal wetland of central Italy. Data were obtained by point count method. During the seasonal water-level decrease in wetland channels, the Diversity Index and Species Richness of the entire assemblage dropped significantly between May and July. A significant decrease in the number of species was observed in the middle of May, attributed to decreasing water levels related to natural (climatic) and anthropogenic (local fish farming) causes, and the subsequent drying of surrounding marshes and meadows. A first phenological threshold was observed in May, when the water level decreased to 70 cm in channels. A high species turnover occurred in the entire assemblage during this period. The herbivorous-omnivorous species (Anatidae and Rallidae) and zoophagous species (Ardeidae and Podidpedidae) during the study period exhibited opposite trends in the diversity index values. The diversity index progressively decreased for the herbivorous-omnivorous species in the late spring, while increasing for the zoophagous species, due to a greater availability of food (increased fish density due to decreased water level). These contrasting results are a consequence of ecological and phenological (sedentary vs. migrants) traits of the species belonging to these guilds. These data represent useful information for elaborating management strategies focused on the water level regime in Mediterranean small wetlands in which fish-farming activities also occur.
机译：这项研究评估了季节性水位变化对意大利中部残留沿海湿地中与水有关的鸟类的两个觅食行会的影响。通过点计数法获得数据。在湿地河道的季节性水位下降期间，整个种群的多样性指数和物种丰富度在5月至7月之间显着下降。 5月中旬观察到物种数量显着减少，这归因于与自然（气候）和人为（当地鱼类养殖）原因相关的水位下降，以及随后沼泽和草地的干燥。五月份观察到第一个物候阈值，当时通道中的水位降至70厘米。在此期间，整个组合中的物种更新率很高。在研究期间，草食性杂食性物种（Ana科和R科）和食虫物种（Ardeidae和Podidpedidae）在多样性指数值上呈现相反的趋势。食草杂食性物种的多样性指数在春季末期逐渐下降，而食虫性物种的多样性指数由于食物的可获得性增加（由于水位降低而增加了鱼类密度）。这些不同的结果是属于这些行会的物种的生态和物候（自然与迁徙）特征的结果。这些数据为制定管理战略提供了有用的信息，这些管理战略侧重于地中海小湿地中的水位制度，在这些小湿地中还发生了鱼类养殖活动。

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