ABSTRACT Regulation has profoundly altered the ecological character of many rivers in the world, with pronounced effects in dryland systems subject to competing demand for water between the environment and society. Pervasive changes to flow regimes have cascading effects on ecological processes and biota attuned to natural variability. The Lower River Murray in south-eastern Australia occupies a curious landscape, being a large lowland river flowing through semi-arid environs fed by a vast inland basin from upstream temperate (River Murray, seasonally predictable) and subtropical-to-desert (Darling River, episodic and highly variable) regions. Extensive regulation via upland dams, water abstraction and serial lowland weirs has reduced mean annual discharge to the sea by two-thirds and transformed riverine hydraulics, leading to dramatic changes in the composition and abundance of biota, including the simplification of a formerly biologically and functionally diverse fish assemblage. Research since the 1980s, often led by the late Keith Forbes Walker, has sought to characterise ecological response to regulation on the Lower River Murray to understand pattern and process and aid in rehabilitation. This paper synthesises a significant body of work relating to freshwater fishes in the river to set a foundation for future monitoring, research and management.

中文翻译：

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流量调节简化了南澳大利亚墨累河下游的低地鱼类群落

摘要 监管已经深刻地改变了世界上许多河流的生态特征，对受环境和社会之间对水的竞争性需求影响的旱地系统产生了显着影响。流态的普遍变化对生态过程和适应自然变化的生物群具有连锁效应。澳大利亚东南部的墨累河下游拥有奇特的景观，它是一条流经半干旱环境的大型低地河流，由来自上游温带（墨累河，季节性可预测）和亚热带到沙漠（达令河）的广阔内陆盆地供养，情节和高度可变）区域。通过高地水坝、取水和连续低地堰的广泛调节使每年向海的平均排放量减少了三分之二，并改变了河流水力学，导致生物群的组成和丰度发生巨大变化，包括简化以前生物和功能多样化的鱼类组合。自 1980 年代以来，通常由已故的基思·福布斯·沃克 (Keith Forbes Walker) 领导的研究试图描述墨累河下游对监管的生态反应的特征，以了解模式和过程并帮助恢复。本文综合了与河流中淡水鱼类相关的大量工作，为未来的监测、研究和管理奠定了基础。试图描述对墨累河下游监管的生态反应，以了解模式和过程并帮助恢复。本文综合了与河流中淡水鱼类相关的大量工作，为未来的监测、研究和管理奠定了基础。试图描述对墨累河下游监管的生态反应，以了解模式和过程并帮助恢复。本文综合了与河流中淡水鱼类相关的大量工作，为未来的监测、研究和管理奠定了基础。