Now showing items 11-20 of 34
On the regional stabilization of locally unstable predator-prey relationships
(Elsevier, 1973-09-14)
The stabilizing effects of interhabitat migration and local population extinction are established by an analysis of the variable Pi, where Pi refers to the proportion of habitats occupied by species i. This is followed by ...
Sources of reactive nitrogen affecting ecosystems in Latin America and the Caribbean: current trends and future perspectives
(Kluwer Academic Publishers; Springer Science+Business Media, Inc., 2006-04-06)
While the amount of reactive nitrogen circulating at the global level has increased markedly in the last century, the effects of this increase are largely seen at the regional level due to interacting ecological and ...
A GIS Model of Subsurface Water Potential for Aquatic Resource Inventory, Assessment, and Environmental Management
(Springer-Verlag; Springer-Verlag New York, Inc., 2003-12)
Biological, chemical, and physical attributes of aquatic ecosystems are often strongly influenced by groundwater sources. Nonetheless, widespread access to predictions of subsurface contributions to rivers, lakes, and ...
Anthropogenic N deposition and the fate of 15 NO 3 − in a northern hardwood ecosystem
(Kluwer Academic Publishers; Springer Science+Business Media, 2004-06)
Human activity has substantially increased atmospheric NO 3 − deposition in many regions of the Earth, which could lead to the N saturation of terrestrial ecosystems. Sugar maple ( Acer saccharum Marsh.) dominated northern ...
Populus tremuloides photosynthesis and crown architecture in response to elevated CO 2 and soil N availability
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-04)
We tested the hypothesis that elevated CO 2 would stimulate proportionally higher photosynthesis in the lower crown of Populus trees due to less N retranslocation, compared to tree crowns in ambient CO 2 . Such a response ...
Nutritional indices in the gypsy moth ( Lymantria dispar (L.)) under field conditions and host switching situations
(Springer-Verlag, 1994-03)
A large proportion of gypsy moths ( Lymantria dispar (L.)) are likely to experience multiple species diets in the field due to natural wandering and host switching which occurs with these insects. Nutritional indices in ...
The role of data in the EIS process: Evidence from the BLM wilderness review
(Elsevier, 1993-03)
Various propositions have been offered about the role of the environmental impact statement (EIS) in agency decision making. These include statements that agencies are (1) using the information collected in the EIS to make ...
Assessing Biotic Integrity of Streams: Effects of Scale in Measuring the Influence of Land Use/Cover and Habitat Structure on Fish and Macroinvertebrates
(Springer-Verlag; Springer-Verlag New York Inc., 1999-02)
Fine root chemistry and decomposition in model communities of north-temperate tree species show little response to elevated atmospheric CO 2 and varying soil resource availability
(Springer-Verlag, 2005-12)
Rising atmospheric [CO 2 ] has the potential to alter soil carbon (C) cycling by increasing the content of recalcitrant constituents in plant litter, thereby decreasing rates of decomposition. Because fine root turnover ...