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Assessing Effects of Flow Regulation and an Experimental Flow Pulse on Population Size Structure of Riverine Fish with Contrasting Biological Characteristics
Environmental Management ( IF 3.5 ) Pub Date : 2021-02-06 , DOI: 10.1007/s00267-021-01428-3
Robert J Rolls 1
Affiliation  

Despite effects of dams and water extraction on river hydrology and consequences of aquatic ecosystems being broadly appreciated, empirical evidence is lacking for many regions (e.g. subtropics). Evidence is necessary to determine (i) the circumstances where environmental flows are necessary to protect or improve ecological processes and (ii) what hydrological events are required to achieve those ecological characteristics. Here, temporal variation in the size structure of two small-bodied fish species with contrasting ecological characteristics (Australian smelt, Cox’s gudgeon) was compared between two pairs of unregulated and regulated rivers in subtropical Australia. Frequency of in-channel flow pulses in each regulated river was lower compared to paired unregulated rivers. An experimental flow pulse was delivered to one regulated river to assess the ecological outcomes of in-channel flow pulses and inform future decisions about the use of environmental water allocations. Temporal changes in the population size structure of both species were similar between unregulated and regulated rivers and showed no response to the experimental pulse. While the experimental flow briefly suppressed in-stream temperature, changes in temperature were not beyond the thresholds at which spawning occurs or the thermal tolerances for either species. Similar population structure between unregulated and regulated rivers can be attributed to the magnitude of flow regulation being insufficient to alter the physico-chemical conditions, habitat and trophic mechanisms supporting population dynamics during the study period. This suggests current regulated hydrology is protective of local populations of Australian smelt and Cox’s gudgeon in these study rivers.



中文翻译:

评估流量调节和实验流量脉冲对具有对比生物学特征的河流鱼类种群规模结构的影响

尽管大坝和取水对河流水文的影响和水生生态系统的后果得到广泛认可,但许多地区(例如亚热带)缺乏经验证据。证据对于确定 (i) 保护或改善生态过程所必需的环境流量的情况以及 (ii) 实现这些生态特征所需的水文事件是必要的。在这里,在亚热带澳大利亚的两对未调节和调节的河流之间比较了两种具有对比生态特征的小体型鱼类(澳大利亚胡鱼,Cox's gudgeon)的大小结构的时间变化。与成对的未调节河流相比,每条受调节河流中河道内流量脉冲的频率较低。将实验流量脉冲传送到一条受管制的河流,以评估河道内流量脉冲的生态结果,并为未来有关环境水分配使用的决策提供信息。两种物种种群规模结构的时间变化在未调节和调节的河流之间相似,并且对实验脉冲没有反应。虽然实验流短暂地抑制了流内温度,但温度的变化并未超出产卵发生的阈值或任一物种的热耐受性。不受管制和受管制河流之间类似的种群结构可归因于流量调节的幅度不足以改变研究期间支持种群动态的物理化学条件、栖息地和营养机制。

更新日期:2021-02-07
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