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Human-induced changes to the nitrogen cycle have led to a growing interest in processes that remove nitrogen from water. Denitrification, which is the microbial reduction of nitrate to gaseous nitrogen (mainly N 2 plus small amounts of N 2 O), can remove a large fraction of the fixed nitrogen that reaches a body of water, but rates of denitrification are(More)
Whole-system denitrification in the South Platte River was measured over a 13-month period using an open-channel N 2 method and mass-balance measurements. Concentrations of dissolved N 2 were measured with high precision by membrane-inlet mass spectrometry and estimates of denitrification were based on the mass flux of N 2 , after correction for reaeration(More)
approved: _____________________________________________________________________ Carl. B. Schreck Steven J. Parker Depleted species of rockfish (Sebastes spp.) from the Northeast Pacific experience high discard mortality due to “barotrauma,” induced from the rapid change in pressure during capture. Research suggests rockfish have the potential to survive(More)
Overfished species of rockfish, Sebastes spp., from the Northeast Pacific experience high bycatch mortality because of 'barotrauma', a condition induced from the rapid change in pressure during capture. Field experiments show that it may be possible for rockfish to recover from barotrauma if quickly recompressed; however, no work has followed the(More)
A Sebastes-specific complementary DNA (cDNA) microarray was developed to identify potential biomarkers involved in the capture stress and recovery of Sebastes species if they are assisted in returning to their original depth of capture following barotrauma. Black rockfish Sebastes melanops were exposed to simulated decompression from 450 kPa (c. 35 m depth)(More)
The aim of this study was to determine a physiologically “ideal” temperature range of Pacific sardine (Sardinops sagax caeruleus) from the northern stock by assessing the effects of cumulatively increasing or decreasing temperature on their stress physiology. Sardines collected off the coast of Southern California during late spring and late fall were(More)
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