Rates of microbenthic and meiobenthic bacterivory in a temperate muddy tidal flat community

Article Abstract:

The grazers of bacteria in a muddy tidal flat community were identified and their grazing rates determined using fluorescence-labeled bacteria. Two ciliates and a nematode had the highest consumption rates for coliforms. Other nematodes and ciliates, as well as microflagellates and copepods, had somewhat lower grazing rates. Some grazers were found to discriminate between coliforms and enterococci. The high rates for some species indicate intensive grazing. However, the potential bacterial consumption for each type is less than 1% of the total standing stock due to the much lower density of the grazers.

Bacteria, Benthos, Benthic zone

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Spatial and temporal variation of phenanthrene-degrading bacteria in intertidal sediments

Article Abstract:

The diversity of potential phenanthrene-degrading bacteria in moderately contaminated sediments was examined by phenotypically characterizing the isolates to identify the patterns of similarity. Although spatial factors exhibited limited influence on the diversity, the structure of the polycyclic aromatic hydrocarbon-degrading communities in the isolates displayed dramatic alterations over time. Most of the phenanthrene-degrading bacteria isolated were pseudomonad and pseudomonad-like organisms.

Sedimentation analysis

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Biotransformation of polycyclic aromatic hydrocarbons by yeasts isolated from coastal sediments

Article Abstract:

The presence of yeasts in Massachusetts coastal sediments was enumerated, and their potential to biotransform polycyclic aromatic hydrocarbons (PAHs) was determined. Candida and Rhodotorula were the most frequently isolated yeast genera. The hydrocarbon-degrading yeast densities correlated with the level of hydrocarbon exposure. Trichosporon penicillatum exhibited the greatest capacity for phenanthrene biotransformation. The ability of marine yeasts to transform PAHs appears to be widespread.

Physiological aspects, Yeast fungi, Yeasts (Fungi)

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