Now showing items 61-70 of 306
Biomass transfer subsidizes nitrogen to offshore food webs
We evaluated the potential contribution of allochthonous biomass subsidies to the upper trophic levels of offshore food webs in the northeastern Gulf of Mexico (GOM). We made this evaluation considering nitrogen, an essential ...
The importance of dissimilatory nitrate reduction to ammonium (DNRA) in the nitrogen cycle of coastal ecosystems
(The Oceanography Society, 2013-09)
Until recently, it was believed that biological assimilation and gaseous nitrogen (N) loss through denitrification were the two major fates of nitrate entering or produced within most coastal ecosystems. Denitrification ...
Scavenging, cycling and removal fluxes of 210Po and 210Pb at the Bermuda time-series study site
Quantifying relative affinities of Po and Pb in different populations of marine particulate matter is of great importance in utilizing 210Po as a tracer for carbon cycling. We collected and analyzed water samples for the ...
Testing isosource : stable isotope analysis of a tropical fishery with diverse organic matter sources
(Ecological Society of America, 2006-02)
We sampled consumers and organic matter sources (mangrove litter, freshwater swamp-forest litter, seagrasses, seagrass epiphytes, and marine particulate organic matter [MPOM]) from four estuaries on Kosrae, Federated States ...
Soil carbon fluxes and stocks in a Great Lakes forest chronosequence
We measured soil respiration and soil carbon stocks, as well as micrometeorological variables in a chronosequence of deciduous forests in Wisconsin and Michigan. The chronosequence consisted of (1) four recently disturbed ...
Use of non-natal estuaries by migratory striped bass (Morone saxatilis) in summer
(U.S. Dept. of Commerce, NOAA NMFS, 2009-07)
For most migratory fish, little is known about the location and size of foraging areas or how long individuals remain in foraging areas, even though these attributes may affect their growth, survival, and impact on ...
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N
We examined short- and long-term nitrogen (N) dynamics and availability along an arctic hillslope in Alaska, USA, using stable isotope of nitrogen (15N), as a tracer. Tracer levels of 15NH4+ were sprayed once onto the ...
(American Meteorological Society, 2010-04-15)
Corrigendum: Sokolov, A., and Coauthors, 2009: Probabilistic forecast for twenty-first-century climate based on uncertainties in emissions (without policy) and climate parameters. J. Climate, 22, 5175–5204.
A pan-arctic evaluation of changes in river discharge during the latter half of the 20th century
(American Geophysical Union, 2006-03-30)
Several recent publications have documented changes in river discharge from arctic and subarctic watersheds. Comparison of these findings, however, has been hampered by differences in time periods and methods of analysis. ...
CO2 and CH4 exchanges between land ecosystems and the atmosphere in northern high latitudes over the 21st century
(American Geophysical Union, 2006-09-15)
Terrestrial ecosystems of the northern high latitudes (above 50oN) exchange large amounts of CO2 and CH4 with the atmosphere each year. Here we use a process-based model to estimate the budget of CO2 and CH4 of the region ...