Voir la source de How UGT1A7 Improved Our Life This Year

g. Stuart and Pillar, 1990, Bollens et al., 1992, Nakagawa et al., 2003, Antezana, 2010?and?Liu and Sun, 2010). Comparison of our day and night MOCNESS samples indicated that almost all of the euphausiid population was below our deepest sampling depth of about 100?m during the day, and highly concentrated near the surface at night. Although diel vertical migration is primarily a predator avoidance behavior, it has been shown that the pattern can be modified somewhat by the food environment (e.g. Dagg, 1985?and?Dagg et al., 1997). In our study, we observed two occasions when some of the euphausiid population remained near the surface during the day and both occurred under poor feeding conditions. [http://en.wikipedia.org/wiki/UGT1A7 UGT1A7] A large population of euphausiids in near-surface waters at night was not sufficient to result in high pellet production. In our study, phytoplankton size structure was the most important characteristic distinguishing high-flux (HI) from low-flux (LO) locations. When the surface [http://www.selleckchem.com/products/PF-2341066.html Crizotinib mouse] phytoplankton assemblage was dominated by small cells and had few large cells, pellet concentrations and fluxes were low, regardless of euphausiid concentrations. These euphausiids are inefficient feeders on small cells, and also the concentrations of small cells were comparatively low which would result in low ingestion rates and thus low production rates of fecal pellets. High pellet production and flux were only observed when there was a large population of dielly migrating euphausiids and a food environment with high concentrations of large phytoplankton. This was the case for D/N CTD casts 31/33, where euphausiid stocks were high at night and the phytoplankton assemblage was dominated by large cells. The resulting pellet flux was high, reaching almost 5000?mg?C?m?2?d?1 at 100?m. In contrast, N/D CTD casts 14/15 had large euphausiid stocks near the surface [http://www.selleckchem.com/products/r428.html R428] at night but pellet flux was low,