The measurement of upwelling and subsequent biological process by means of the Technicon Autoanalyzer® and associated equipment

TL;DR: In this article, the impact of clear-cut logging on aquatic ecosystems has been evaluated in a series of watersheds along 13 headwater stream reaches in south-western British Columbia, Canada.

TL;DR: In this paper, the authors measured the rates of NH,+ production (d) and incorporation into bacterial cells (i) in sediments from different stations, at different seasons, and indicated that the validity of the rates d and i was indicated by the predicted correlation of cl:i ratios with N:C ratios of the sediment, and the predicted n:C ratio at which net NH4+ uptake occurred.

TL;DR: In this paper, the authors examined the relationship between primary production and environmental variables along the Mississippi River plume/oceanic gradient off Southwest Pass, Louisiana, and found that a large proportion of variation in primary production could be explained on the basis of light and biomass ( r 2 > 0.857, N > 25).

TL;DR: In this paper, a volumetric model was proposed to evaluate the effect of exposure of anoxic subsurface sediment containing partly degraded organic material to oxygen via irrigated worm burrows or by reworking.

TL;DR: In this article, a modified model III Turner fluorometer at sea was used to continuously measure chlorophyll from 0·04 to between 10 and 15 mg m −3, a range adequate for all open ocean studies.

TL;DR: Concentrations of silicate and nitrate, temperature, and per cent transmission of white light were simultaneously recorded from a position in 18 m of water off Mission Beach, California, during a 3-day period in May.

TL;DR: In this article, a Technicon AutoAnalyzer was used for the photometric determination of PO43− − P/l in sea water and natural waters, showing a coefficient of variation of 0·86% at a level of 40 μg PO4−P/l.