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首页> 外文期刊>european journal of phycology >Macroscopic cyanobacteria of the genusNostoc: a neglected and endangered constituent of European inland aquatic biodiversity
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Macroscopic cyanobacteria of the genusNostoc: a neglected and endangered constituent of European inland aquatic biodiversity

机译：宏观蓝藻属Nostoc：欧洲内陆水生生物多样性中被忽视和濒临灭绝的组成部分

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Nostoc caeruleum, N. commune, N. microscopicum, N. parmelioides, N. pruniforme, N. verrucosumandN. zetterstedtiiare all cyanobacteria forming macroscopically visible colonies. They were selected for a nature conservation case study. Their specific identity is easily determined, and reliable historical records are available. Life conditions for these species in Europe in the #x2018;virgin#x2019; postglacial biosphere, historical reports and the present-day situation are surveyed. Data concerning type materials, supplements to the protologues, and morphology are presented. The classic descriptions and diagnoses based only on herbarium material are supplemented by ontogenetic details. Global/regional changes in the biosphere (climate, regulation of lake levels and river flows, import of plant nutrients, water pollution, acidification, etc.) and their consequences for aquatic biocoenoses are reviewed. The analysis of man-made impacts on the environment enables us to evaluate the present state of habitats where these algae occur today or where they are now extinct. Documented changes in environmental conditions in the past serve as a basis for assessing the likely future developments of the biotopes and of the whole landscape where these cyanobacteria form part of the biocoenoses. However, there are few recent detailed ecological studies on benthic and terrestrial cyanobacteria. It is not yet clear which of the different components covered by the comprehensive term #x2018;eutrophication#x2019; is the decisive factor for the changes in aquatic biocoenoses and the decline of cyanobacterial biodiversity.
机译：Nostoc caeruleum， N. commune， N. microscopicum， N. parmelioides， N. pruniforme， N. verrucosumandN.zetterstedtiiare 所有蓝藻形成宏观可见的菌落。他们被选为自然保护案例研究。他们的具体身份很容易确定，并且有可靠的历史记录。调查了这些物种在欧洲“处女”冰后生物圈中的生活条件、历史报告和现状。介绍了有关类型材料、原型补充和形态的数据。仅基于植物标本材料的经典描述和诊断由个体发育细节补充。本文综述了生物圈的全球/区域变化（气候、湖泊水位和河流流量调节、植物养分进口、水污染、酸化等）及其对水生生物共生的影响。对人为对环境影响的分析使我们能够评估这些藻类今天出现或现已灭绝的栖息地的现状。记录在案的过去环境条件的变化是评估生物群落和整个景观未来可能发展的基础，这些蓝藻构成了生物共生的一部分。然而，最近关于底栖和陆生蓝藻的详细生态学研究很少。目前尚不清楚“富营养化”这一综合术语所涵盖的不同成分中，哪些是水生生物共生变化和蓝藻生物多样性下降的决定性因素。

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