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Biomonitoring of intermittent rivers and ephemeral streams in Europe: current practice and priorities to enhance ecological status assessments

机译:欧洲间歇性河流和短暂河流的生物监测:加强生态状况评估的当前做法和重点

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摘要

Intermittent rivers and ephemeral streams (IRES) are common across Europe and dominate some Mediterranean river networks. In all climate zones, IRES support high biodiversity and provide ecosystem services. As dynamic ecosystems that transition between flowing, pool, and dry states, IRES are typically poorly represented in biomonitoring programmes implemented to characterize EU Water Framework Directive ecological status. We report the results of a survey completed by representatives from 20 European countries to identify current challenges to IRES status assessment, examples of best practice, and priorities for future research. We identify five major barriers to effective ecological status classification in IRES: 1. the exclusion of IRES from Water Framework Directive biomonitoring based on their small catchment size; 2. the lack of river typologies that distinguish between contrasting IRES; 3. difficulties in defining the ‘reference conditions’ that represent unimpacted dynamic ecosystems; 4. classification of IRES ecological status based on lotic communities sampled using methods developed for perennial rivers; and 5. a reliance on taxonomic characterization of local communities. Despite these challenges, we recognize examples of innovative practice that can inform modification of current biomonitoring activity to promote effective IRES status classification. Priorities for future research include reconceptualization of the reference condition approach to accommodate spatiotemporal fluctuations in community composition, and modification of indices of ecosystem health to recognize both taxon-specific sensitivities to intermittence and dispersal abilities, within a landscape context.
机译:断断续续的河流和短暂河流(IRES)在整个欧洲很常见,并主导着一些地中海河流网络。在所有气候区,IRES支持高生物多样性并提供生态系统服务。作为在流动状态,池状态和干燥状态之间转换的动态生态系统,IRES通常在为表征欧盟水框架指令生态状况而实施的生物监测计划中代表性不足。我们报告了由20个欧洲国家的代表完成的一项调查的结果,该调查旨在确定IRES状态评估当前面临的挑战,最佳实践的例子以及未来研究的重点。我们确定了将IRES进行有效生态状况分类的五个主要障碍:1.基于集水区规模小,将IRES从水框架指令生物监测中排除。 2.缺乏区分不同IRES的河流类型; 3.难以定义代表未受影响的动态生态系统的“参考条件”; 4.根据为多年生河流开发的方法抽样的抽水群落对IRES生态状况进行分类; 5.依靠当地社区的分类学特征。尽管存在这些挑战,但我们认识到一些创新实践的实例,这些实例可以指导当前生物监测活动的修改,以促进有效的IRES状态分类。未来研究的重点包括重新构想参考条件方法,以适应社区组成的时空波动,以及修改生态系统健康指数,以识别景观环境中分类群特定的对间断和分散能力的敏感性。

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