Experimental manipulation of the presence of ants in two different years indicated that the existence of ants had a positive effect on nymph numbers on both host plants, Chrysothamnus viscidiflorus and Wyethia spp, but not on WyethIA spp.

The theory clarifies the condition for the energetic equivalence rule (EER) to hold, and provides a statistical explanation for the importance of species functional variation in determining population dynamics and coexistence patterns.

Journal Article Unusual Abundance of Peromyscus at Gothic, Colorado Get access Robert H. Catlett, Robert H. Catlett Dept. of Zoology, Univ. of California, Davis Search for other works by this author on: Oxford Academic Google Scholar Robert Z. Brown Robert Z. Brown Dept. of Zoology, Colorado College

Abstract 1. Although associative learning is widespread across animals, its ecological importance is difficult to assess because learning is rarely studied in the field, where informative cues are juxtaposed against complex backgrounds of uninformative noise. 2. Ants rely heavily on chemical cues fo

Abstract Recent droughts have highlighted concerns of how rising summer temperatures will increase tree mortality rates across the western United States. We analyzed subfossil wood samples from Colorado dating to the last interglacial to assess the response of two common conifers to a previous warm

Recruitment of juveniles is an important vital rate that influences population growth and is fundamental to understanding trends in population size. Estimates of recruitment are often focused on the period just after hatching (prefledgling stage), which is typically the lowest survival period and of

Research Article| April 01 1991 A Practical Technique for Measuring the Behavior of Foraging Animals Rosemary J. Smith, Rosemary J. Smith Search for other works by this author on: This Site PubMed Google Scholar Joel S. Brown Joel S. Brown Search for other works by this author on: This Site PubMed G

Ruth L. Willey, Harold O. Eiler, Drought Resistance in Subalpine Nymphs of Somatochlora semicircularis Selys (Odonata: Corduliidae), The American Midland Naturalist, Vol. 87, No. 1 (Jan., 1972), pp. 215-221

Journal Article Notes on the Mammals of the Gothic Region, Gunnison County, Colorado Get access James S. Findley, James S. Findley Museum of Natural History, University of Kansas, Lawrence, KansasDepartment of Zoology, Ohio State University, Columbus, Ohio Search for other works by this author on: O

Abstract Quantitative understanding is lacking on how the depth of active groundwater circulation in bedrock affects mountain streamflow response to a multi‐year drought. We use an integrated hydrological model to explore the sensitivity of a variety of streamflow metrics to bedrock circulation dept

Counts of montane Euphydryas editha along transects at Almont Summit, Colorado, show that males form a dense aggregation along a ridgetop with an estimated 30:1 (male:female) sex ratio. Fertilized females showed preference for subsites below the ridgetop at least as rich in oviposition plants but le

Non-native species have been widely transported, becoming components of ecosystems worldwide. In some cases this can change thestructure and function of an ecosystem. Crested wheatgrass (Agropyron cristatum, Agropyron spp.) was introduced into the Western U.S. inthe late 18th and early 19th centurie

AbstractEvapotranspiration is arguably the least quantified component of the hydrologic cycle. We propose two complementary strategies for estimation of evapotranspiration rates and root water uptake profiles from soil‐moisture sensor‐array data. One is our implementation of ensemble Kalman filter (

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

Newly discovered lacustrine strata suggest that the most signifi cant episode of stream capture in the upper Colorado River system (western USA), namely the abandonment of Unaweep Canyon, probably involved a combination of headward erosion and lake spillover. The abandonment of Unaweep Canyon occurr

Research Article| January 01, 2009 Quaternary incision rates and drainage evolution of the Uncompahgre and Gunnison Rivers, western Colorado, as calibrated by the Lava Creek B ash Andrew L. Darling; Andrew L. Darling * 1Department of Earth and Planetary Sciences, Northrop Hall, University of New Mex

AbstractStratigraphic analyses and radiocarbon geochronology of alluvial deposits exposed along the Roaring River, Colorado, lead to three principal conclusions: (1) the opinion that stream channels in the higher parts of the Front Range are relics of the Pleistocene and nonalluvial under the presen

Loss of sunlight-reflecting snow spurs evaporation and ebbs river flow

Selenium (Se) is an essential micronutrient for humans and animals and can be toxic when present in high concentrations in soil and water. Many soils in Gunnison and Uncompahgre River Basins in West-Central Colorado are formed from deposits derived mainly from weathered Mancos shale that have high c