Defining reference conditions for acidified waters using a modern analogue approach

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• 作者：Simpson ; Gavin L. ; Shilland ; Ewan M. ; Winterbottom ; Julie M. ; Keay ; Janey
• 关键词：Reference conditions ; Analogue matching ; Diatoms ; Cladocera ; Aquatic macrophytes ; Macro-invertebrates ; Palaeolimnology
• 刊名：Environmental Pollution
• 出版年：2005
• 出版时间：September, 2005
• 年：2005
• 卷：137
• 期：1
• 页码：119-133
• 全文大小：305 K

文摘

Analogue matching is a palaeolimnological technique that aims to find matches for fossil sediment samples from a set of modern surface sediment samples. Modern analogues were identified that closely matched the pre-disturbance conditions of eight of the UK Acid Waters Monitoring Network (AWMN) lakes using diatom- and cladoceran-based analogue matching. These analogue sites were assessed in terms of hydrochemistry, aquatic macrophytes and macro-invertebrates as to their suitability for defining wider hydrochemical and biological reference conditions for acidified sites within the AWMN. The analogues identified for individual AWMN sites show a close degree of similarity in terms of their hydrochemical characteristics, aquatic macrophytes and, to a lesser extent, macro-invertebrate fauna. The reference conditions of acidified AWMN sites are inferred to be less acidic than today and to support a wider range of acid-sensitive aquatic macrophyte and macro-invertebrate taxa than that recorded in the AWMN lakes over the period of monitoring since 1988.