Beetle and spider oenoses of salt varnishes in the Seewinkel as a basis for nature conservation work: a quarter of a century later — Final Report 2021

Association Institute for Applied Biology and Environmental Education Highlights: In 2019, the salinity in the upper soil was only one-fifth of the salinity of 1993. The number of individuals in the Spiders in 2019 was 66 % lower than in 1993. Among the spiders, wetland species declined the most. The total number of barrel beetle catches was only slightly reduced; the Beetle Fauna showed however, a strong turnover. A series of typical salt-bottom-bound runetle species of the lake angle, which in the last Throughout the century, all paints were common and in 1993 still in high levels. Numbers of pieces could only be captured in single copies or no more at all to be identified. Degradation tendencies observed in 1993 mainly on the eastern paints; it now also affects the western paints to a large extent. A rapid restoration of the groundwater level ratios appears in order to maintain the Salt paints and their species communities are urgently needed.应用生物与环境教育协会（Association Institute for Applied Biology and Environmental Education） 核心亮点： 2019年，表层土壤含盐量仅为1993年的五分之一。 2019年蜘蛛个体总数较1993年下降66%，其中湿地蜘蛛物种的下降幅度最为显著。 桶甲（barrel beetle）的总捕获量仅略有下降，但甲虫区系（Beetle Fauna）却发生了强烈的类群更替。 一系列典型湖岸盐底生甲虫（salt-bottom-bound runetle）物种，在过去一个世纪中均为常见类群，1993年时其种群数量仍处于较高水平，如今仅能以单份标本捕获，甚至完全无法被鉴定识别。 1993年观测到的生境退化趋势主要集中于东部样地，如今也已大范围波及西部样地。 亟需快速恢复地下水位比例，以维持盐生境（Salt paints）及其物种群落。