Fig. 3.

Benthic gross primary production (GPP) on soft sediment and rocks, and pelagic GPP, measured on four occasions during the 2012 summer season in the Öre estuary, Umeå, Sweden. The benthic values are the un-treated measured values, whereas the pelagic values are depth-integrated, and error bars (not always visible) for the benthic samples represent the standard deviation based on two replicates. The depth at which 1 % of surface PAR remains is marked with a red X. The linear relationship between soft sediment GPP (GPPsoft sed.) and PAR is given for each sampling occasion, however, the low number of replicates for these relationships (and for the benthic sample error bars) should be noted