What are the environmental & biological factors conditioning current & historic changes in the aquatic plant communities ...

英国旱地水体水生植物群落当前和历史性变化的环境和生物因素是什么？摘要：淡水生态系统及其包含的生物多样性是地球上受到最大威胁的一些生态系统。英国高地(前身为酸性)水域监测网络由英国政府于1988年建立，目的是监测排放控制立法对英国22个湖泊和溪流的水化学和生物多样性的影响。水生植物是淡水生物多样性的关键组成部分，已经收集了跨越30年的详细记录。然而，到目前为止，还没有对水生植物数据进行系统的分析。这个新的项目旨在(I)调查旱地淡水水生植物多样性变化的驱动因素，以及(Ii)确定这些变化如何影响水生生态系统功能。要考虑的驱动因素包括污染物(例如，硫和氮的大气沉积)、与气候有关的最高温度变化、水文、水流和风暴、水文地貌以及湖泊不断变化的光气候/冰盖环境。第三个目标(Iii)是研究湖泊沉积物中植物EDNA的保存和科学潜力，以重建过去的水生植物组合。来自沉积物岩心的大型化石和花粉数据将与三十年来植物丰度和分布记录的历史生物监测档案进行比较。

Title: What are the environmental and biological factors conditioning current and historic changes in the aquatic plant communities of upland waterbodies in the United Kingdom?Summary: Freshwater ecosystems and the biodiversity that they contain are some of the most threatened on the planet. The UK Upland (formerly Acid) Waters Monitoring Network was established in 1988 by the UK Government to monitor the effects of emission control legislation on the water chemistry and biodiversity of 22 lakes and streams across the UK. Aquatic plants are a key component of freshwater biodiversity, and detailed records spanning 30 years have been collected. To date, however, no systematic analysis of the aquatic plant data has been performed.This novel project aims to (i) investigate the drivers of changes in aquatic plant diversity in upland freshwaters, and (ii) determine how these changes impact aquatic ecosystem functioning. Drivers to be considered include pollutants (e.g. atmospheric deposition of sulphur and nitrogen), climate-related changes in maximum temperatures, hydrology, flow and storminess, hydromorphology and additionally the changing light climate/ice cover environment in lakes.The third aim (iii) is to examine the preservation and scientific potential of plant eDNA in lake sediments for reconstructing past aquatic plant assemblages. Plant eDNA and where possible macrofossil and pollen data from sediment cores will be compared with three-decades of historic biomonitoring archives of plant abundance and distribution records.