Now showing items 61-70 of 290
Plant community responses to experimental warming across the tundra biome
(National Academy of Sciences of the USA, 2006-01-20)
Recent observations of changes in some tundra ecosystems appear to be responses to a warming climate. Several experimental studies have shown that tundra plants and ecosystems can respond strongly to environmental change, ...
Correction to “Importance of carbon-nitrogen interactions and ozone on ecosystem hydrology during the 21st century”
(American Geophysical Union, 2009-08-22)
Landscape heterogeneity and the biodiversity of Arctic stream communities : a habitat template analysis
(National Research Council Canada, 2005-08-27)
We predicted that substratum freezing and instability are major determinants of the variability of stream community structure in Arctic Alaska. Their effects were conceptualized as a two-dimensional habitat template that ...
Tight coupling between leaf area index and foliage N content in arctic plant communities
The large spatial heterogeneity of arctic landscapes complicates efforts to quantify key processes of these ecosystems, for example productivity, at the landscape level. Robust relationships that help to simplify and ...
Sugars as source indicators of biogenic organic carbon in aerosols collected above the Howland Experimental Forest, Maine
Bulk aerosols (> 1 μm) were collected continuously above the canopy at the Howland Experimental Forest, Maine, USA from May to October 2002. Each sample integrated over an approximately two-week period. Mono- and ...
Effects of preservation methods of muscle tissue from upper-trophic level reef fishes on stable isotope values (δ13C and δ15N)
Research that uses stable isotope analysis often involves a delay between sample collection in the field and laboratory processing, therefore requiring preservation to prevent or reduce tissue degradation and associated ...
Species compositional differences on different-aged glacial landscapes drive contrasting responses of tundra to nutrient addition
In the northern foothills of the Brooks Range, Alaska, moist non-acidic tundra dominates more recently deglaciated upland landscapes, whereas moist acidic tundra dominates older upland landscapes. In previous studies, ...
Linking ecology and economics for ecosystem management
(American Institute of Biological Sciences, 2006-02)
This article outlines an approach, based on ecosystem services, for assessing the trade-offs inherent in managing humans embedded in ecological systems. Evaluating these trade-offs requires an understanding of the biophysical ...
Microbial biogeography along an estuarine salinity gradient : combined influences of bacterial growth and residence time
(American Society for Microbiology, 2004-03)
Shifts in bacterioplankton community composition along the salinity gradient of the Parker River estuary and Plum Island Sound, in northeastern Massachusetts, were related to residence time and bacterial community doubling ...
Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska
(National Research Council Canada, 2004-12-23)
In many long-lived species such as Arctic grayling (Thymallus arcticus), population growth rate is most sensitive to changes in adult survival probabilities. Understanding the factors that regulate adult survival in this ...