TY - JOUR
AU - Jan Köhler
AB - In situ measurement of the growth rates of planktonic populations can be improved by using dialysis chambers (‘cage cultures’) to avoid shifts in the chemical environment during incubation. Vertical mixing and small-scale turbulence affect the growth of planktonic populations, there fore natural mixing conditions should be simulated as closely as possible during the incubation. A new device is described here which combines the advantages of a dialysis chamber with a programmable vertical mixing regime. Realistic phytoplankton growth rates can thus be measured in situ under con ditions of vertical mixing and small-scale turbulence. The chamber made of transparent, UV-transmitting acrylic glass was fitted at both ends with permeable polycarbonate membranes. It was moved vertically through the water column by a pocket-sized lift and rotated simultaneously on its central axis. The method was applied to two typos of experiments on growth and losses of phytoplankton in the River Severn, UK. The first one compared changes in biovolume of phytoplankton in a water parcel flowing downstream (6% h −1 decline) with those in a simultaneously incubated dialysis chamber moved between water surface and river bottom (7% h −1 increase). The difference equates to algal losses prevented in the chamber but suffered along the river (mainly sedimentation and grazing of benthic filter feeders). Loss rate of diatoms was three times higher than those of chlorophytes. In another experiment growth of phytoplankton from the main stream and lateral dead zone was compared under different mixing conditions. Algae from the main stream grew faster than from the dead zone. Only cryptophytes preferred calm conditions, all the other algal groups grew faster in chambers moved through the water column than in stationary ones. Further possible applications in both standing and flowing waters are discussed. © Oxford University Press « Previous | Next Article » Table of Contents This Article J. Plankton Res. (1997) 19 (7): 849-862. doi: 10.1093/plankt/19.7.849 » Abstract Free Full Text (PDF) Free Classifications Original article Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Köhler, J. Search for related content Related Content Load related web page information Share Email this article CiteULike Delicious Facebook Google+ Mendeley Twitter What's this? 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TI - Measurement of in situ growth rates of phytoplankton under conditions of simulated turbulence
JF - Journal of Plankton Research
DO - 10.1093/plankt/19.7.849
DA - 1997-07-01
UR - https://www.deepdyve.com/lp/oxford-university-press/measurement-of-in-situ-growth-rates-of-phytoplankton-under-conditions-6TyIaSGOm0
SP - 849
VL - 19
IS - 7
DP - DeepDyve
ER -