The factors (physical, chemical and climatic) that lead to blue-green algal growth are complex and although most follow a predictable annual cycle, rapid algal growth can happen at any time. Blue-green algae can pose a serious threat to water quality, ecosystem stability, surface drinking water supplies, and public health through toxin production. Continuous monitoring is key to early detection of harmful algal blooms.
Over the past 20 years active fluorescence has been widely adopted by the scientific community, ecosystem managers and crop growers as a rapid and non-invasive method of estimating photosynthetic performance within a wide range of organisms, including phytoplankton (microalgae and cyanobacteria), biofilms, benthic autotrophs (corals, macroalgae and sea grasses) and terrestrial plants. The main rational for applying active fluorescence is that changes in key fluorescence parameters can reveal the early onset of chronic and acute degradation of photosynthetic performance and subsequent growth, e.g. resulting from nutrient deficiency or the presence on one or more toxicants.
CTG has a range of algae monitoring systems to choose from including:
The ALGAE-Station and ALGAE-Station Pro systems provide real-time display of key Chlorophyll parameters necessary for the management of the water treatment process. Data is collected using our highly sensitive range of miniaturised, LUX submersible sensors and are then displayed on the permanently installed Watchkeeper wall mounted unit. As well as being very sensitive, these fluorometer sensors are optimised for low noise results. Warning alarms, sampling rates and the dynamic range of the sensor are user adjustable.
Act2-based laboratory system: Act2 & the FastOcean FRR fluorometer can be combined to produce a highly automated system for probing oxygenic photosynthesis by phytoplankton. The Act2 system marks a big step forward in terms of both performance and functionality. For example, the incremental steps available for incident photon irradiance (E) are much smaller and cover a much larger range (up to and above full sunlight).
The ALGAE-Wader and ALGAE-Wader Pro systems provide real-time display of key Chlorophyll parameters necessary for water quality monitoring. Data are collected using our highly sensitive range of miniaturised LUX submersible sensors and are displayed on the Hawk handheld display and logging unit. As well as being very sensitive, these fluorometer sensors are optimised to provide low noise results. Warning alarms, sampling rates and the dynamic range of the sensor are user adjustable.
FastOcean APD System: Fast Repetition Rate (FRR) fluorometry provides a non-intrusive and non-destructive method for probing photosynthesis by phytoplankton. The two FRR fluorometers within the FastOcean Ambient Plus Dark (APD) profiling system generate the data required to estimate the electron flux through all photosystem II (PSII) reaction centres per unit volume of sea water, on wide spatial and temporal scales. Given that Gross Primary Productivity by phytoplankton (GPP) is generally the main sink for PSII electron flux, these data can be used to estimate GPP.