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Effect of Thermal Stratification on Phytoplankton and Nutrient Dynamics in a Regulated River (Saar, Germany)
Author(s) -
Engel F.,
Fischer H.
Publication year - 2017
Publication title -
river research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.679
H-Index - 94
eISSN - 1535-1467
pISSN - 1535-1459
DOI - 10.1002/rra.3071
Subject(s) - stratification (seeds) , phytoplankton , weir , environmental science , nutrient , thermal stratification , algal bloom , spring bloom , chlorophyll a , mixed layer , oceanography , hydrology (agriculture) , surface water , geology , ecology , thermocline , chemistry , biology , biochemistry , botany , germination , cartography , seed dormancy , geotechnical engineering , dormancy , geography , environmental engineering
The weir pool Serrig is the deepest one along the impounded river Saar. Damming caused massive changes in the river's hydrodynamics. We analyzed the spatio‐temporal variability of thermal density stratification in the weir pool and its effect on phytoplankton and nutrient dynamics. In the analysis, continuous measurements from the years 2014 and 2015 were combined with three two‐day sampling campaigns in spring 2015. Thermal stratification occurred regularly in the downstream section of the weir pool during spring and summer and showed a diurnal rhythm. Temperature differences >1 K between the 1 and 2 m water layer were observed during 34 out of 217 days (16%) in 2014, with maximum temperature gradients up to 3.71 K. Whereas the influence of thermal stratification on phytoplankton biomass and distribution was low during the algal bloom in early spring, stratification events between May and July promoted temporary algal blooms in the surface layer with chlorophyll a concentrations up to 98 µg Chla l −1 and a maximum difference between the 1 and 2 m water layer of 36 µg Chla l −1 . Some of the stratification events resulted in reduced concentrations of dissolved nutrients in the surface layer as a result of increased uptake by algae, with maximum gradients between the surface and the 8 m water layer of 0.070 mg ortho‐PO 4 3‐ ‐P l −1 , 0.136 mg NH 4 + −N l −1 and 0.24 mg NO 3 ¯−N l −1 . These vertical gradients should be considered in sampling protocols for the assessment of the water quality of temporarily stratified river sections. Copyright © 2016 John Wiley & Sons, Ltd.