Benthic biofilm chlorophyll a content and biomass data for 3 intensively studied Wessex chalkstream sites, England, UK

Chlorophyll-a content and ash-free dry mass of quantitative samples of the biofilm on benthic substrate from three chalkstream sites in the Wessex chalk area (Nine Mile River, River Till and River Wylye). Chlorophyll a content and biomass were determined from up to 10 replicate samples at each site on each sampling occasion. The data are presented as means with standard deviation. Data were collected on seven occasions on the Wylye and Nine Mile River and on five occasions on the Till, between October 2012 and October 2013. Data were collected to construct quantified food webs detailing the flux of mass and nutrients between nodes of the food web. This dataset was created as part of work package 3.2 of the Wessex Biodiversity & Ecosystem Service Sustainability (BESS) project.

Publication date: 2017-06-26

Access and use conditions

This dataset is embargoed and will be made available by November 3, 2018 at the latest  

This resource will be available under the terms of the Open Government Licence

© Queen Mary University of London


Study area
Temporal extent
2012-10-01    to    2013-10-31


Samples were collected on 7 separate occasions from Nine Mile River and the River Wyle. However samples were only collected on five occasions from the River Till. We did not sample this river during the salmonid breeding season Dec-Mar so as not to disturb redds. Also two replicate chlorophyll-a samples were not processed from Nine Mile River in March 2013.

Standard laboratory procedures for determining chlorophyll-a and ash-free dry mass (AFDM) content were strictly followed but there was no formal quality assurance procedure, such as repeat analysis of replicate aliquots from the same replicate scrap. Final values were checked for marked outliers (none were found) before calculations were undertaken.


Pretty, J.
Queen Mary University of London
Pacioglu, O.
Queen Mary University of London
Duerdoth, C
Queen Mary University of London
Arnold, A.
Queen Mary University of London
Murphy, J.
Queen Mary University of London
Hawczak, A.
Queen Mary University of London
Jones, J.I.
Queen Mary University of London

Other contacts

Environmental Information Data Centre
NERC Environmental Information Data Centre
Point Of Contact
Murphy, J.
Queen Mary University of London
Environmental Information Data Centre


Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid


Topic categories
Environmental Monitoring Facilities
Project keywords
Wessex BESS

Dataset identifiers


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