7,660 results
Inverted resistivity and IP models
This data release consists of 1,984 line-kilometers of airborne electromagnetic (AEM), magnetic data and radiometric data collected from October to November 2017 in the upper East River and surrounding watersheds in central Colorado. The U.S. Geological Survey contracted Geotech Ltd. to acquire thes
National Assessment of Oil and Gas Project - Denver Basin Province (039) Boundary
The USGS Central Region Energy Team assesses oil and gas resources of the United States. The onshore and State water areas of the United States comprise 71 provinces. Within these provinces, Total Petroleum Systems are defined and Assessment Units are defined and assessed. Each of these provinces is
National Assessment of Oil and Gas Project - Uinta-Piceance Province (020) Boundary
The USGS Central Region Energy Team assesses oil and gas resources of the United States. The onshore and State water areas of the United States comprise 71 provinces. Within these provinces, Total Petroleum Systems are defined and Assessment Units are defined and assessed. Each of these provinces is
National Assessment of Oil and Gas Project - Southwestern Wyoming Province (037) Boundary
The USGS Central Region Energy Team assesses oil and gas resources of the United States. The onshore and State water areas of the United States comprise 71 provinces. Within these provinces, Total Petroleum Systems are defined and Assessment Units are defined and assessed. Each of these provinces is
Long-distance dispersal to the mining frontier in late 19th century Colorado
Summary Leading edges of population expansion provide unique opportunities for individuals to elevate their social and economic status. However, dispersal into unknown areas may have high costs such as violence associated with conflicts over resources, unfamiliar and harsh ecological conditions, and
Propaganda, public information, and prospecting: explaining the irrational exuberance of central place foragers during a late nineteenth century Colorado silver rush
Traditionally, models of resource extraction assume individuals act as if they form strategies based on complete information. In reality, gathering information about environmental parameters may be costly. An efficient information gathering strategy is to observe the foraging behavior of others, ter
Ecological restoration of Alder Creek, Colorado, USA
Partial ecological restoration of important attributes of Alder Creek, Gunnison County, CO, U.S.A., has been successful since the area has continued in its restored condition for over a decade. However, due to cattle grazing, the system is not self maintaining and, thus, requires continual managemen
Pollinator experience, neophobia, and the evolution of flowering time
Background complexity affects colour preference in bumble bees
Nutrient availability and phytoplankton nutrient limitation across a gradient of atmospheric nitrogen deposition
Atmospheric nitrogen (N) deposition to lakes and watersheds has been increasing steadily due to various anthropogenic activities. Because such anthropogenic N is widely distributed, even lakes relatively removed from direct human disturbance are potentially impacted. However, the effects of increase
Shifts in lake N:P stoichiometry and nutrient limitation driven by atmospheric nitrogen deposition
Nitrogen Overload The cycling of essential nutrients in terrestrial ecosystems has been altered by human activities. Elser et al. (p. 835 ) report a comparative analysis of lakes in Norway, Sweden, and in the United States that suggests that this is also true in aquatic ecosystems such as lakes. Dep
Using phenotypic manipulations to study multivariate selection of floral trait associations
Phenotypic manipulations of two or more traits in combination provide a direct way of testing for selection of floral trait associations. Such experiments will be particularly valuable if rooted in hypotheses about differences between types of pollinators and tied to a proposed evolutionary history.
Effects of flowering plant density on pollinator visitation, pollen receipt, and seed production in <i>Delphinium barbeyi</i>
Variation in flowering plant density can have conflicting effects on pollination and seed production. Dense flower patches may attract more pollinators, but flowers in those patches may also compete for pollinator visits and abiotic resources. We examined how natural and experimental conspecific flo
The effects of nutrient addition on floral characters and pollination in two subalpine plants, <i>Ipomopsis aggregata</i> and <i>Linum lewisii</i>
Nectar sugar limits larval growth of solitary bees (Hymenoptera: Megachilidae)
The bottom-up effects of plant food quality and quantity can affect the growth, survival, and reproduction of herbivores. The larvae of solitary bee pollinators, consumers of nectar and pollen, are also herbivores. Although pollen quantity and quality are known to be important for larval growth, lit
The importance of interannual variation and bottom-up nitrogen enrichment for plant-pollinator networks
Striking changes in food web structure occur with alterations in resource supply. Like predator–prey interactions, many mutualisms are also consumer–resource interactions. However, no studies have explored how the structure of plant–pollinator networks may be affected by nutrient enrichment. For thr
“Owens Backs Water for Agriculture”
Author: Deborah Frazier Denver Rocky Mountain News January 31st 2000
“Evaporation Emptying Great Lakes”-2000
Debbie Howlett: USA Today The Denver Post Monday, April 24th 2000
“Corn Belt Wilts as Drought Persists”- 2000
Becky Bohrer: Associated Press The Denver Post April 27th 2000
Water worries
Frank S. Hoag and Robert H. Rawlings. The Pueblo Chieftain. August 9, 1999.