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Publication
Featured researches published by Colin Roberts.
Science of The Total Environment | 2018
H.L. Moorhouse; Daniel S. Read; Suzanne McGowan; M. Wagner; Colin Roberts; Linda K. Armstrong; D.J.E. Nicholls; Heather Wickham; Mike Hutchins; Michael J. Bowes
Recent river studies have observed rapid phytoplankton dynamics, driven by diurnal cycling and short-term responses to storm events, highlighting the need to adopt new high-frequency characterisation methods to understand these complex ecological systems. This study utilised two such analytical methods; pigment analysis by high performance liquid chromatography (HPLC) and cell counting by flow cytometry (FCM), alongside traditional chlorophyll spectrophotometry and light microscopy screening, to characterise the major phytoplankton bloom of 2015 in the River Thames, UK. All analytical techniques observed a rapid increase in chlorophyll a concentration and cell abundances from March to early June, caused primarily by a diatom bloom. Light microscopy identified a shift from pennate to centric diatoms during this period. The initial diatom bloom coincided with increased HPLC peridinin concentrations, indicating the presence of dinoflagellates which were likely to be consuming the diatom population. The diatom bloom declined rapidly in early June, coinciding with a storm event. There were low chlorophyll a concentrations (by both HPLC and spectrophotometric methods) throughout July and August, implying low biomass and phytoplankton activity. However, FCM revealed high abundances of pico-chlorophytes and cyanobacteria through July and August, showing that phytoplankton communities remain active and abundant throughout the summer period. In combination, these techniques are able to simultaneously characterise a wider range of phytoplankton groups, with greater certainty, and provide improved understanding of phytoplankton functioning (e.g. production of UV inhibiting pigments by cyanobacteria in response to high light levels) and ecological status (through examination of pigment degradation products). Combined HPLC and FCM analyses offer rapid and cost-effective characterisation of phytoplankton communities at appropriate timescales. This will allow a more-targeted use of light microscopy to capture phytoplankton peaks or to investigate periods of rapid community succession. This will lead to greater system understanding of phytoplankton succession in response to biogeochemical drivers.
Science of The Total Environment | 2012
Michael J. Bowes; Nicola L. Ings; Stephanie McCall; Alan Warwick; Cyril Barrett; Heather Wickham; Sarah Harman; Linda K. Armstrong; Peter Scarlett; Colin Roberts; Katja Lehmann; Andrew C. Singer
Science of The Total Environment | 2012
Michael J. Bowes; Emma Gozzard; Andrew C. Johnson; Peter Scarlett; Colin Roberts; Daniel S. Read; Linda K. Armstrong; Sarah Harman; Heather Wickham
Journal of Hydrology | 2014
Michael J. Bowes; Helen P. Jarvie; Pamela S. Naden; Gareth H. Old; Peter Scarlett; Colin Roberts; Linda K. Armstrong; Sarah Harman; Heather Wickham; A.L. Collins
Proceedings of the Geologists' Association | 2015
Andrew J. Newell; James Sorensen; J.E. Chambers; P.B. Wilkinson; Sebastian Uhlemann; Colin Roberts; Daren Gooddy; Christopher H. Vane; Andrew Binley
Earth System Science Data | 2018
Michael J. Bowes; Linda K. Armstrong; Sarah Harman; Heather Wickham; David J. E. Nicholls; Peter Scarlett; Colin Roberts; Helen P. Jarvie; Gareth H. Old; Emma Gozzard; Nuria Bachiller-Jareno; Daniel S. Read
Archive | 2015
Charlie Stratford; James Sorensen; Colin Roberts; Andrew House; Ponnambalam Rameshwaran
Archive | 2015
Andrew J. Newall; James Sorensen; J.E. Chambers; P.B. Wilkinson; Sebastian Uhlemann; Colin Roberts; Daren Gooddy; Christopher H. Vane; Andrew Binley
Archive | 2014
Colin Roberts; Mike Acreman; Ponnambalam Rameshwaran; Cedric Laize
Archive | 2013
Andrew House; James Sorensen; Daren Gooddy; Benjamin Marchant; Andrew J. Newell; Gareth H. Old; Colin Roberts; Peter Scarlett