Abstract
BackgroundNatural flow regimes are an essential component of healthy fluvial systems, but hydropower production alters flow components, disrupting natural processes and impacting species reliant on them. Establishing improved management of flow regimes requires a better understanding of how fish respond to altered flow components, such as flow magnitude. We recently conducted a systematic map to provide a summary of the existing literature base on the impacts of flow regime changes on direct outcomes of freshwater or estuarine fish productivity. Of those studies considering the impacts of flow magnitude changes due to hydropower, studies on fish abundance, biomass and diversity responses were identified as subtopics (i.e., knowledge clusters) that had sufficient coverage for further review. This systematic review proposes to estimate how fish abundance, biomass and diversity are affected by alterations in flow magnitude due to hydropower production.MethodsThis systematic review will use evidence identified during a systematic map process. An updated English language search will be performed using six bibliographic databases, Google Scholar, and networking tools to include academic and grey literature published after 2016. Eligibility screening will be conducted at two stages: (1) title and abstract, and (2) full-text. We will include all studies that evaluate the impact of changes to (or manipulations of) flow magnitude due to hydropower on fish abundance, density, biomass, yield, species richness, composition or diversity indices. The focus of this review will be on the downstream fluvial effects of flow magnitude changes and include hydroelectric facilities where water moves via gravity or by active pumping. Any freshwater or estuarine fish species or species group in temperate regions will be considered. Included eligible studies will undergo a critical appraisal that will assess the internal study validity. We will extract information on study characteristics, intervention/exposure and comparator details, measured outcomes, and effect modifiers. A narrative synthesis will describe the quantity and characteristics of available evidence, and where sufficient numbers of similar studies are available, meta-analysis will be conducted to estimate an overall mean and variance of effect.
Highlights
Natural flow regimes are an essential component of healthy fluvial systems, but hydropower production alters flow components, disrupting natural processes and impacting species reliant on them
Maintaining the ecological characteristics of fluvial systems altered by the demands of hydroelectricity production requires the careful management of flow regime
Natural flow regimes have regulated both geological and biological components of natural waterbodies through time [1,2,3] and aquatic biota have evolved and adapted to the specific dynamics of their environment [1, 2, 4]. Alterations to flow, such as those caused by hydroelectricity production, can disrupt these natural processes and result in a variety of environmental and species responses [2]
Summary
The review will follow the CEE guidelines and standards for systematic reviews [27] and conform to ROSES reporting standards [28] (see Additional file 1). We will extract data on bibliographic information, study location and characteristics (e.g., geographic location, climate, waterbody name and type), hydroelectric facility name, study design details (e.g., study dates, study design), intervention/exposure and comparator details (e.g., control site type, treatment magnitude, comparator magnitude, comparator type), outcome (i.e., abundance, biomass, diversity, richness, composition), sampling method(s) (e.g., type, size of sampling units), species (or species groups) and life history (e.g., genus and species names, life stage), effect modifiers (see below), study validity assessment results (see above) and study findings (flow magnitude effects) as reported by authors This list may be expanded depending on the type and variety of included studies.
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