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

Life history trade-offs are one of the central tenets of evolutionary demography. Trade-offs, depicting negative covariances between individuals' life history traits, can arise from genetic constraints, or from a finite amount of resources that each individual has to allocate in a zero-sum game betw

The benefits of dominance may not come without costs, particularly for males. For example, the “immunocompetence handicap hypothesis” states that males with enhanced mating success allocate resources to enhance reproductive output at a cost to their current health, whereas the “resource quality hypo

Bird communities associated with differing cliff variables in Jefferson County, Colorado, were sampled using point counts. Species-specific density estimates and community diversity values were compared among four cliff types: small cliffs, medium cliffs, large cliffs, and non-cliff sites. A model s

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

A considerable quantity of fine specimen material has been obtained from a number of San Juan County mines and prospects during the last decade, in spite of the fact that commercial activity has almost ceased.

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.

The long-term release of uranium from residual sources at former uranium mill sites was often not considered in prior conceptual and numerical models, as contaminant removal focused on meeting radiological standards. To determine the reactive transport parameters, column tests were completed with va

John L. Anderson, James L. Reveal, Reed C. Rollins, Lesquerella vicina (Brassicaceae), a New Species from the Uncompahgre River Valley in Western Colorado, Novon, Vol. 7, No. 1 (Spring, 1997), pp. 9-12

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

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

Evaluation of long-term temporal and spatial climatic change in mountainous regions is a critical challenge because of the interactive effects of multiple land and climatic factors and processes. Here we present the application of the statistical framework to the assessment of changes of climatic co

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

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

Reconstructing Pleistocene glaciation timing and extent is vital for understanding paleoclimate. Whereas late Pleistocene glaciation has been studied extensively in western North American mountain ranges, the glacial history of the western Elk Range in Colorado remains understudied, particularly in

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.