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Search: authors:"Hugh L. MacIntyre"

3 papers found.
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Enumerating viable phytoplankton using a culture-based Most Probable Number assay following ultraviolet-C treatment

Ballast water management systems (BWMS) must be tested to assess their compliance with standards for the discharge of organisms, for example in the ≥ 10- and < 50-μm size category, which is dominated by phytoplankton. Assessment of BWMS performance with the vital stains fluorescein diacetate + 5-chlorofluorescein diacetate, required by regulations in the USA, is problematic in...

On the use of the serial dilution culture method to enumerate viable phytoplankton in natural communities of plankton subjected to ballast water treatment

Discharge standards for ballast water treatment (BWT) systems are based on concentrations of living cells, for example, as determined with vital stains. Ultraviolet radiation (UV) stops the reproduction of microorganisms without killing them outright; they are living, but not viable, and ecologically as good as dead. Consequently, UV-treated discharge can be compliant with the...

Environmental correlates of community composition and toxicity during a bloom of Pseudo-nitzschia spp. in the northern Gulf of Mexico

The potentially toxic diatom genus Pseudo-nitzschia is a common component of the microalgal assemblage in the northern Gulf of Mexico. We characterized community structure in Mobile Bay and the adjacent littoral Gulf in a bloom year (2005) and non-bloom year (2006). In both cases, a shift from domination by eukaryotes to cyanobacteria was correlated with seasonal changes in...