Many marsh passerines are cataloged as threatened taxa, mostly due to their high degree of specialization and the generalized deterioration of wetlands worldwide. In this context, habitat selection studies are a very helpful tool to achieve optimal wetland management, take appropriate conservation measures, and avoid potential conservation conflicts resulting from species-specific habitat requirements. For this purpose, we analyzed the population trends and habitat requirements of the threatened marsh passerine community inhabiting a protected Mediterranean wetland with persistent hydrological problems due to aquifer overexploitation. Listening points were conducted yearly for eight consecutive years (2012-2019), and habitat categorization and abundance estimation of the target species (Great Reed Warbler, Acrocephalus arundinaceus; Moustached Warbler, Acrocephalus melanopogon; Reed Bunting, Emberiza schoeniclus witherbyi; Savi's Warbler, Locustella luscinioides; Bearded Tit, Panurus biarmicus) were performed at each point. Our results show that the populations of the Great Reed Warbler strongly declined during the study period while those of the Reed Bunting increased; the remaining species experienced an initial increase in abundance but have declined in recent years. The habitat type, measured as relative cover of common reed, saw sedge, bulrush, dry vegetation, open water, and dry surface was important to explain variations in the marsh passerine community structure. Focal species showed different, and even opposite, habitat requirements over the course of eight years, but the abundance of all species seem to be conditioned by disturbances in the wetland water regime. Conservation implications, including the importance of wetland hydrological regime and the presence of heterogeneous environments, are discussed in order to provide relevant information for the conservation of the marsh passerine communities of Mediterranean wetlands.

中文翻译：

---

受保护的地中海湿地中受威胁的沼泽雀科动物的种群趋势和栖息地选择

许多沼泽雀形目被列为受威胁分类群，主要是因为它们的高度专业化和全球湿地的普遍恶化。在这种情况下，栖息地选择研究是实现最佳湿地管理、采取适当保护措施和避免因特定物种栖息地要求而导致的潜在保护冲突的非常有用的工具。为此，我们分析了受威胁的沼泽雀类群落的种群趋势和栖息地需求，它们栖息在受保护的地中海湿地，由于含水层过度开发而存在持续的水文问题。连续八年（2012-2019）每年进行一次监听点，目标物种（大芦苇莺，Acrocephalus arundinaceus；胡子莺，Acrocephalus melanopogon；Reed Bunting, Emberiza schoeniclus witherbyi；萨维莺，Locustella luscinioides；Bearded Tit, Panurus biarmicus) 在每个点进行。我们的结果表明，在研究期间，大芦苇莺的种群数量急剧下降，而芦苇莺的种群数量有所增加；其余物种的丰度最初有所增加，但近年来有所下降。栖息地类型（以普通芦苇、锯齿草、芦苇、干燥植被、开阔水域和干燥表面的相对覆盖率衡量）对于解释沼泽雀类群落结构的变化很重要。在八年的时间里，重点物种表现出不同甚至相反的栖息地要求，但所有物种的丰富程度似乎都受到湿地水体干扰的影响。