Short-term and seasonal variation in metabolic balance in Liverpool Bay |
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| Authors: | Anouska Panton Claire Mahaffey Naomi Greenwood Joanne Hopkins David Montagnes Jonathan Sharples |
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| Institution: | (1) School of Environmental Sciences, University of Liverpool, Liverpool, L69 3GP, UK;(2) Centre for Environment Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, Suffolk, NR33 0HT, UK;(3) National Oceanography Centre Liverpool, 6 Herdman Street, Liverpool, L3 5DA, UK;(4) Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, UK; |
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| Abstract: | Regions of freshwater influence (ROFIs) are dynamic areas within the coastal seas that experience cycles of stability driven
by density gradients and the spring-neap tidal cycle. As a result, pulses of biological production may occur on a more frequent
timescale than the classic seasonal cycle. Net community production (NCP) rates and chlorophyll a concentration are presented from a site within the ROFI of Liverpool Bay and compared to similar measurements made at a site
outside the ROFI during 2009. The influence of water column stability on biological production in the ROFI was also investigated
using high-frequency observations from a Cefas Smartbuoy. Both sites were autotrophic from spring to autumn before becoming
heterotrophic over winter. NCP at the inshore site was estimated to range from 30.8 to 50.4 gC m−2 year−1. A linear relationship detected between chlorophyll a and NCP from both sites was used to estimate metabolic balance over 1 year at the ROFI site using high-resolution chlorophyll
a concentrations from the Smartbuoy but was found to poorly replicate NCP rates compared to those derived from dissolved oxygen
fluxes. There was no clear biological response to periods of stratification within the ROFI, and it is proposed that changes
in light attenuation in the Liverpool Bay ROFI, driven not only by stratification but also by fluctuations in riverine sediment
load, most likely play an important role in controlling phytoplankton growth in this region. |
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