Reliable Instruments for an Unreliable World

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March 20, 2014

Parameters: Active Fluorescence

Photosynthetic yield is measured in an effort to estimate the photosynthetic efficiency of primary producers, more specifically the organism’s  ability to use light for photosynthetic processes.  When phytoplankton are nutrient or light limited, stressed or exposed to biotoxins, their photosynthetic yield decreases indicating a blocking or degradation of the photosynthetic pathway resulting in a diminished ability to produce sugars or compounds necessary for  growt...

October 28, 2011

Parameters: Active Fluorescence

Phytoplankton communities in lake ecosystems

  • Communities may be diverse or dominated by one or few species

  • The environment that phytoplankton experience is highly dependent on water stratification and flow

  • These parameters are highly variable on both spatial & temporal scales

  • Blooms of potentially toxic cyanobacteria & overall eutrophication an important issue for lake ecosystems

  • Light extremes & nutrient stress may alter the photosynthetic e...

October 28, 2011

Parameters: Active Fluorescence

Turner Designs, Inc has developed an in situ variable fluorescence system that can be used to determine the quantum efficiency of phytoplankton in both oligotrophic and mesotrophic environments. The PhytoFlash can be integrated into a CTD or multi-parameter system, used in self-contained mode in conjunction with the internal data logger and attachable battery or in flow-through mode for laboratory work and in underway monitoring mode. The variable fluorescence meas...

October 27, 2011

Parameters: Active Fluorescence

RISE (River Influences on Shelf Ecosystems) is a 5-year interdisciplinary study of the Columbia River plume, funded by the Coastal Ocean Program of the National Science Foundation. The UCSC component of RISE includes the Kudela Lab. Kudela’s group is responsible for remote sensing, bio-optics and phytoplankton productivity estimates using stable and radiotracer techniques (http://oceandatacenter.ucsc.edu/RISE/). This study addresses three hypotheses during a 5-year...

October 27, 2011

Parameters: Active Fluorescence

Turner Designs, Inc has developed an in situ variable fluorescence system that can be used to determine the quantum efficiency of phytoplankton in both oligotrophic and mesotrophic environments. The PhytoFlash (patent pending) is distinct from other 'active' fluorometers on the market in that it is the first solid-state instrument capable of variable fluorescence measurements on natural concentrations of phytoplankton. The solid-state platform allows for a much wid...

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