Macrobenthos composition at the shoreline of Kislo-Sladkoye Lake, separating from the White Sea

Kislo-Sladkoye Lake is a unique model reservoir separating from the White Sea, which requires careful comprehensive interdisciplinary study of all characteristics. The lake is a subject of system-atic hydrological and hydrochemical surveys. An integral qualitative study of the macrozoobenthos at the shoreline of the lake has been conducted for the first time. Fourteen invertebrate macrozoo-benthic taxa were found. Mass species distribution boundaries were determined. Such marine an-imals as Mytilus edulis, Semibalanus balanoides, Littorina saxatilis, are only found at the marine side beyond the lake rapid. Brackish species show three distribution patterns: Gammarus duebeni, chionomids, Haliplus apicalis are met around the lake; Hydrobia ulvae, Chironomus salinarius, Enochrus halophilus are absent near the lake rapid; diptera larvae Setacera aurata are only found on slightly sloping coast parts. The collected data allowed us to map the lake zonation based on the species composition. Three zones are allocated: Marine fauna zone on the east near the rapid; brackish fauna around the lake and enriched muddy shallows in the northern part.基斯洛-斯拉德科耶湖（Kislo-Sladkoye Lake）是一处与白海相分离的独特人工模拟水库，需对其各项特征开展严谨的跨学科综合研究。该湖为系统性水文与水化学调查的研究对象。本研究首次对该湖岸带的大型底栖无脊椎动物（macrozoobenthos）开展了完整的定性调查，共检出14个大型底栖无脊椎动物类群，并明确了优势类群的分布边界。紫贻贝（Mytilus edulis）、白纹藤壶（Semibalanus balanoides）、滨螺（Littorina saxatilis）等海洋动物仅分布于湖口急流外侧的海洋一侧。咸淡水物种则呈现三种分布格局：杜氏钩虾（Gammarus duebeni）、摇蚊类（chionomids）、尖胸豉甲（Haliplus apicalis）广泛分布于湖周区域；光滑狭口螺（Hydrobia ulvae）、盐生摇蚊（Chironomus salinarius）、嗜盐水龟虫（Enochrus halophilus）均未在湖口急流附近出现；双翅目幼虫金鬃植蝇（Setacera aurata）仅分布于坡度平缓的岸段。基于本次采集的调查数据，研究人员可依据物种组成绘制该湖的生态分区图。本次研究共划分出三个生态分区：东侧紧邻湖口急流的海洋动物区、湖周咸淡水动物区，以及北部富集淤泥的浅滩区域。