Abstract The distribution of Trichoptera of the Hozgarganta River (Los Alcornocales Natural Park, SW Spain) in relation with environmental factors was examined. Three groups of species were recognised according to the altitudinal gradient. In the headwaters the caddisflies Rhyacophila fonticola, Lepidostoma hirtum, Silonella aurata, Allogamus gibraltaricus, Hydropsyche infernalis and Diplectrona felix predominated; in the constrained section of the tributaries Polycentropus kingi, Chimarra marginata, Hydropsyche iberomaroccana, R. fonticola and Tinodes sp. prevailed; finally, in the main channel H. iberomaroccana, C. marginata, Hydropsyche lobata, Leptocerus lusitanicus and Rhyacophila munda were the most important species. A direct ordination analysis (CCA) was used to describe assemblage changes among sites and corroborated that conductivity and temperature were the variables that best explained Trichoptera distribution. The temporal analysis showed changes in the Trichoptera diversity and richness in permanent stretches, as well as variations in the structure of the communities according to the season. We identified autumn‐winter species (H. infernalis, H. siltalai, H. lobata, R. fonticola and R. munda ) and summer ones (Ithytrichia sp, Oxyethira unidentata, Mystacides azurea and Setodes argentipunctellus ). In the basin we distinguished permanent, intermittent and ephemeral reaches with similar caddisfly richness and diversity, however the species composition associated with each one was different. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

中文翻译：

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Hozgargantacatchment（西班牙西南部洛斯阿尔科诺卡莱斯自然公园）的毛翅目群落分布


摘要 研究了 Hozgarganta 河（西班牙西南部 Los Alcornocales 自然公园）的毛翅目分布与环境因素的关系。根据海拔梯度识别出三组物种。在源头，石蛾以Ryacophila fonticola、Lepidostoma hirtum、Silonella aurata、Allogamus gibraltaricus、Hydrpsyche infernalis 和 Diplectrona felix 为主；在支流Polycenttropus kingi、Chimarra marginata、Hydropsyche iberomaroccana、R. fonticola 和Tinodes sp 的受限部分。占了上风；最后，在主河道中，H. iberomaroccana、C. marginata、Hydropsyche lobata、Leptocerus lusitanicus 和 Rhyacophila manda 是最重要的物种。直接排序分析（CCA）用于描述位点之间的组合变化，并证实电导率和温度是最能解释毛翅目分布的变量。时间分析显示了永久范围内毛翅目多样性和丰富度的变化，以及群落结构随季节的变化。我们鉴定了秋冬物种（H. infernalis、H. siltalai、H. lobata、R. fonticola 和 R. munda）和夏季物种（Ithytrichia sp、Oxyethira unidentata、Mystacides azurea 和 Setodes argentipunctellus）。在流域中，我们区分了具有相似石蛾丰富度和多样性的永久河段、间歇河段和短暂河段，但与每个河段相关的物种组成不同。 （© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）