Polyphenisms-alternative morphs produced through plasticity-can reveal the evolutionary and ecological processes that initiate and maintain diversity within populations. We examined lifetime fitness consequences of two morphs in a polyphenic population of Arizona tiger salamanders using a 27-year da

The frequency of flows mobilizing river bank sediment along a majority of the Gunnison River in the BCNP has significantly declined since 1966, and decreases in the frequency of significant sediment-mobilizing flows were more pronounced for regions within the BC NP where the channel gradient is lowe

Aspen forests are one of the most dynamic forest types in western North America, responding to chronic factors of competition for resources, as well as episodes of intense herbivory, drought, and fires. The interactions of these driving factors lead to varying age structures of aspen across landscap

Hybridization in flowering plants is determined in part by the rate at which animal pollinators move between species and by the effectiveness of such movements in transferring pollen. Pollinator behavior can also influence hybrid fitness by determining receipt and export of pollen. We incorporated i

Gunnison Sage-Grouse (Centrocercus minimus) is a species of concern for which little demographic information exists. To help fill this information gap, we investigated factors affecting nest success in two populations of Gunnison Sage-Grouse. We assessed the relative effects of (1) vegetation charac

Shigeru Albert AE, Comparative Studies of Developmental Rates, Hibernation, and Food Plants in North American Colias (Lepidoptera, Pieridae), The American Midland Naturalist, Vol. 60, No. 1 (Jul., 1958), pp. 84-96

This study investigates the isolated decomposition of spruce and lodgepole conifer needles to enhance our understanding of how needle litter impacts near-surface terrestrial biogeochemical processes. Harvested needles were exported to a subalpine meadow to enable a discrete analysis of the decomposi

The Monarch Valley, in Grand County, Colorado, on the western slope of the Front Range, was studied to determine evidence of glacial advances other than the two generally recognized on the eastern slope of the range. Greater extent of the Pleistocene ice on the western than on the eastern slope nece

Our results are consistent with the hypothesis that, in these pollen-rewarding species, pollen secondary chemistry may reflect the need to attract and reward pollinators more than the need to defend pollen from herbivory.

Climate-driven species range shifts and expansions are changing community composition, yet the functional consequences in natural systems are mostly unknown. By combining a 30-year survey of subalpine pond larval caddisfly assemblages with species-specific functional traits (nitrogen and phosphorus

AbstractQuantifying flow and transport from hillslopes is vital for understanding water quantity and quality in rivers, but remains obscure because of limited subsurface measurements. Using measured hydraulic conductivity K profiles and water balance over a single year to calibrate a transmissivity

Climate change is affecting interactions among species, including host-parasite interactions. The effects of warming are of particular interest for interactions in which parasite and host physiology are intertwined, such as those between parasitic plants and their hosts. However, little is known abo

The fact that residual nectar exists is consistent with predictions of optimal foraging theory but more detailed work is necessary before it can be concluded that the volumes left behind in A. columbianum flowers are optimal.

Ralph L. Sulerud, Dwight D. Miller, A Study of Key Characteristics for Distinguishing Several Drosophila affinis Subgroup Species, with a Description of a New Related Species, The American Midland Naturalist, Vol. 75, No. 2 (Apr., 1966), pp. 446-474

The objective of the recent paper was to define practices to simultaneously maximize the benefits and minimize the potential unwanted consequences of PDA.

For the past decade, the high-quality, relatively low-cost health care delivered in Grand Junction, Colorado, has led that community to outperform most others in the United States. Medicare patients in Grand Junction have fewer hospitalizations, shorter hospitalizations, and lower mortality rates af