Now showing items 1-10 of 995
Stable isotope food-web analysis and mercury biomagnification in polar bears ( Ursus maritimus )
(Blackwell Publishing Ltd, 2009-12)
Mercury (Hg) biomagnification occurs in many ecosystems, resulting in a greater potential for toxicological effects in higher-level trophic feeders. However, Hg transport pathways through different food-web channels are ...
Microbial Cycling of C and N in Northern Hardwood Forests Receiving Chronic Atmospheric NO 3 − Deposition
(Springer-Verlag; Springer Science+Business Media, Inc., 2006-03)
Sugar maple ( Acer saccharum Marsh.)-dominated northern hardwood forests in the upper Lakes States region appear to be particularly sensitive to chronic atmospheric NO 3 − deposition. Experimental NO 3 − deposition (3 g ...
A revised model for the density and thermal expansivity of K 2 O-Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 liquids from 700 to 1900 K: extension to crustal magmatic temperatures
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-12)
A revised model for the volume and thermal expansivity of K 2 O-Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 liquids, which can be applied at crustal magmatic temperatures, has been derived from new low temperature (701–1092 K) density ...
Direct measurements bearing on the question of the nighttime heating mechanism in the ionosphere
(Elsevier, 1967-01)
Langmuir probe measurements of electron temperature and density were made in the upper F-region on two different occasions near local midnight. The experiments were carried out at Fort Churchill, Canada, and at Wallops ...
Historical changes in sediments of Pyramid Lake, Nevada, USA: consequences of changes in the water balance of a terminal desert lake
(Kluwer Academic Publishers; Springer Science+Business Media, 1994-01)
Sediment cores from the shallow and deep basins of Pyramid Lake, Nevada, revealed variations in composition with depth reflecting changes in lake level, river inflow, and lake productivity. Recent sediments from the period ...
Integrative measures of consumption rates in salmon: expansion and application of a trace element approach
(Blackwell Science Ltd, 2004-10)
1. Establishing reliable estimates of consumption is necessary for understanding the physiology, bioenergetics and trophic relationships of organisms. For fish, the inability to measure consumption directly prevents a ...