Restoration of a chalk stream using wood: assessment of habitat improvements using the Modular River Survey

2019 ◽  
Vol 33 (3) ◽  
pp. 378-389 ◽  
Author(s):  
Judy England ◽  
Lukasz Dobbek ◽  
Brishan Finn Leeming ◽  
Angela M. Gurnell ◽  
Geraldene Wharton
Keyword(s):  
Chalk Stream

Estimation of bacterial production in fresh waters by the simultaneous measurement of [35S]Sulphate and D-[3H]glucose uptake in the dark

1978 ◽  
Vol 24 (8) ◽  
pp. 939-946 ◽  
Author(s):  
P. G. C. Campbell ◽  
J. H. Baker
Keyword(s):  
Bacterial Production ◽  
Membrane Filter ◽  
Outer Edge ◽  
Size Fractionation ◽  
Sulphate Uptake ◽  
Uptake Rates ◽  
Chalk Stream ◽  
Glucose Assimilation ◽  
Heterotrophic Production

Sulphate uptake in the dark by phytoplankton constitutes a severe limitation to the determination of bacterial heterotrophic production from sulphate-uptake rates. Consequently a modification to the 35S-method has been developed involving size fractionation to separate the algae from the bacteria. Both the whole water sample and the algae-free filtrate are incubated in the dark with trace quantities of [3H]glucose, whereas the filtrate alone is incubated with 35SO4. The experimental determined ratio (whole sample glucose assimilation: filtrate glucose assimilation) is used to correct the measured sulphate uptake (filtrate) and yields an estimate of bacterial sulphate uptake in the whole sample.A potential filtration artefact has been demonstrated in the 35SO4 uptake methodology. Excision of the outer edge of the membrane filter and counting of the inner wetted circle alone eliminated this problem and significantly improved the analytical performance of the method: coefficient of variation ~ 5%, detection limit ~ 2 ng S ℓ−1 h−1. The modified [35SO4]–[3H]-glucose method was applied to samples from an English chalk stream: bacterial sulphate uptake was higher during the spring diatom maximum (10.6 ng S ℓ−1 h−1) than 3 weeks later when detritus dominated the seston (4.9 ng S ℓ−1 h−1). We estimate the corresponding rates of formation of particulate (bacterial) carbon to be 0.53 and 0.24 μg C ℓ−1 h−1 respectively.

Emergence patterns of diptera in a chalk stream

1985 ◽  
Vol 7 (2) ◽  
pp. 97-109 ◽  
Author(s):  
C. M. Drake
Keyword(s):  
Emergence Patterns ◽  
Chalk Stream

scholarly journals A small number of anadromous females drive reproduction in a brown trout (Salmo trutta) population in an English chalk stream

2016 ◽  
Vol 61 (7) ◽  
pp. 1075-1089 ◽  
Author(s):  
Jill C. A. Goodwin ◽  
R. Andrew King ◽  
J. Iwan Jones ◽  
Anton Ibbotson ◽  
Jamie R. Stevens
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta ◽  
Chalk Stream
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