Now showing items 1-10 of 64
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 ...
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 ...
Climatic oscillations during the Precambrian era
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1987-07)
A remarkably regular cyclicity with a fundamental period of ~11–12 cycles is preserved in the 680 million year old Elatina formation of South Australia. All but one of the many periods present can be interpreted as resulting ...
Clonal variation in above- and below-ground growth responses of Populus tremuloides Michaux: Influence of soil warming and nutrient availability
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-03)
Trembling aspen (Populus tremuloides Michx.) is the most widely distributed tree species in North America making it important to terrestrial carbon and nutrient cycles. Due to anthropogenic climate change high latitude ...
Rates of evolution on the time scale of the evolutionary process
(Kluwer Academic Publishers; Springer Science+Business Media, 2001-11)
A generational time scale, involving change from one generation to the next, is the time scale of evolution by natural selection. Microevolutionary and macroevolutionary patterns reflect this process on longer time scales. ...
Aquatic Adaptation and Swimming Mode Inferred from Skeletal Proportions in the Miocene Desmostylian Desmostylus
(Kluwer Academic Publishers-Plenum Publishers; Springer Science + Business Media, Inc., 2005-06)
Desmostylians are enigmatic, extinct, semiaquatic marine mammals that inhabited coastlines of the northern Pacific Rim during the late Oligocene through middle Miocene. Principal components analysis (PCA) of trunk and limb ...
Stand Characteristics and Leaf Litter Composition of a Dry Forest Hectare in Santa Rosa National Park, Costa Rica
(Blackwell Publishing Ltd, 1997-12)
One hectare of tropical dry forest in Guanacaste Conservation Area, Costa Rica was mapped and all trees larger than 10 cm diameter at breast height (DBH) identified. The same hectare was sampled for leaf litter and the two ...
Chemistry and decomposition of litter from Populus tremuloides Michaux grown at elevated atmospheric CO 2 and varying N availability
(Blackwell Science Ltd, 2001-01)
It has been hypothesized that greater production of total nonstructural carbohydrates (TNC) in foliage grown under elevated atmospheric carbon dioxide (CO 2 ) will result in higher concentrations of defensive compounds in ...
Fungal community composition and metabolism under elevated CO 2 and O 3
(Springer-Verlag, 2006-02)
Atmospheric CO 2 and O 3 concentrations are increasing due to human activity and both trace gases have the potential to alter C cycling in forest ecosystems. Because soil microorganisms depend on plant litter as a source ...
Seedling survival in a northern temperate forest understory is increased by elevated atmospheric carbon dioxide and atmospheric nitrogen deposition
(Blackwell Publishing Ltd, 2007-01)
We tested the main and interactive effects of elevated carbon dioxide concentration ([CO 2 ]), nitrogen (N), and light availability on leaf photosynthesis, and plant growth and survival in understory seedlings grown in an ...