Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/31344
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Re-evaluating expectations for river phytobenthos assessment and understanding the relationship with macrophytes
Author(s): Kelly, Martyn G
Phillips, Geoffrey
Juggins, Stephen
Willby, Nigel J
Contact Email: n.j.willby@stir.ac.uk
Keywords: Diatoms
Phytobenthos
Reference concept
Water Framework Directive
Macrophytes
Rivers
Issue Date: Oct-2020
Citation: Kelly MG, Phillips G, Juggins S & Willby NJ (2020) Re-evaluating expectations for river phytobenthos assessment and understanding the relationship with macrophytes. Ecological Indicators, 117, Art. No.: 106582. https://doi.org/10.1016/j.ecolind.2020.106582
Abstract: The reference model underlying the UK phytobenthos (diatom) tool for Water Framework Directive assessments is revisited and a new approach is proposed which uses quantile regression to predict the lowest values of the Trophic Diatom Index (equating to the best available condition) at any level of alkalinity . Whilst a reference model based on least disturbed or minimally impacted conditions would be preferable in theory, in practice the absence of lowland high alkalinity streams in a minimally impacted condition in the UK precludes the use of these approaches. Having proposed a revised reference model for phytobenthos, we then go on to examine the relationship between phytobenthos and macrophytes. These two groups respond to nutrients and other stressors in different ways with phytobenthos being more sensitive to nutrients whilst macrophytes better reflect the extent to which secondary effects are likely. We argue that averaging the two sub-elements of the “macrophytes and phytobenthos” biological quality element is a more realistic option than the current approach of taking the lower of the two assessments. It is, however, possible, to predict the value of the combined quality element from either sub-element, though we recognize that this also risks misclassifications.
DOI Link: 10.1016/j.ecolind.2020.106582
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Kelly MG, Phillips G, Juggins S & Willby NJ (2020) Re-evaluating expectations for river phytobenthos assessment and understanding the relationship with macrophytes. Ecological Indicators, 117, Art. No.: 106582. https://doi.org/10.1016/j.ecolind.2020.106582 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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