"E = mc2" of environmental flows: A conceptual framework for establishing a fish-biological foundation for a regionally applicable environmental low-flow formula

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Abstract

Determination of environmental flows at the regional scale has been complicated by the fine-scale variability of the needs of aquatic organisms. Therefore, most regional methods are based on observation of hydrological patterns and lack evidence of connection to biological responses. In contrast, biologically sound methods are too detailed and resource-consuming for applications on larger scales. The purpose of this pilot project was to develop an approach that would breach this gap and provide biologically sound rules for environmental flow (eflow) estimation for the region of Poland. The concept was developed using seven river sites, which represent the four of six fish-ecological freshwater body types common in Poland. Each of these types was distinguished based on a specific fish community structure, composed of habitat-use guilds. The environmental significance of the flows for these communities was established with help of the habitat simulation model MesoHABSIM computed for each of the seven sites. The established seasonal environmental flow thresholds were standardized to the watershed area and assigned to the corresponding water body type. With these obtained environmental flow coefficients, a standard-setting formula was created, which is compatible with existing standard-setting approaches while maintaining biological significance. The proposed approach is a first attempt to use habitat suitability models to justify a desktop formula for the regional scale eflow criteria.

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Parasiewicz, P., Prus, P., Suska, K., & Marcinkowski, P. (2018). “E = mc2” of environmental flows: A conceptual framework for establishing a fish-biological foundation for a regionally applicable environmental low-flow formula. Water (Switzerland), 10(11). https://doi.org/10.3390/w10111501

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