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 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.

AbstractReproduction is thought to be costly for female mammals due to high energetic costs associated with pregnancy and lactation. Such costs of reproduction can be particularly high for younger females, who are less experienced and smaller than fully grown adults, and can manifest themselves with

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.

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

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

Climate change is affecting species and their mutualists and can lead to the weakening or loss of important interspecific interactions. Through independent shifts in partner phenology and distribution, climatic stress can separate mutualists temporally or spatially, leading to alterations in partner

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

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

I assessed the genetic differentiation of populations of Weidemeyer's admiral butterfly (Limenitis weidemeyerii) in central and eastern Colorado by using starch-gel electrophoresis. Wright's F-statistics indicated that there was significant differentiation, both within and between years, among the s

Phenological distributions are characterized by their central tendency, breadth, and shape, and all three determine the extent to which interacting species overlap in time. Pollination mutualisms rely on temporal co-occurrence of pollinators and their floral resources, and although much work has bee

Research Article| April 01, 1988 Sevier-age ramp-style thrust faults at Cedar Mountain, northwestern San Rafael swell (Colorado Plateau), Emery County, Utah K. R. Neuhauser K. R. Neuhauser 1Department of Earth Sciences, P.O. Box 179, Fort Hays State University, Hays, Kansas 67601 Search for other wo

Individuals sometimes exhibit striking constancy to a single behaviour even when they are capable of short-term behavioural flexibility. Constancy enables animals to avoid costs such as memory constraints, but can also inflict significant opportunity costs through behaviour–environment mismatch. It

CHESSON, P. 1978. Predator-prey theory and variability. Ann. Rev. Ecol. Syst. 9:323-347. CURIO, E. 1976. The ethology of predation. Springer-Verlag, New York. DILL, L. M. 1983. Adaptive flexibility in the foraging behavior of fishes. Can. J. Fish. Aq. Sci. 40:398408. DUNBRACK, R. L., AND L. M. DILL.

Research Article| April 01, 1965 Genesis of the White Cloud and Related Pegmatites, South Platte Area, Jefferson County, Colorado C VANCE HAYNES, JR. C VANCE HAYNES, JR. Dept. Geology, University of Arizona, Tucson, Ariz. Search for other works by this author on: GSW Google Scholar GSA Bulletin (196

Recent work has demonstrated that the presence or abundance of specific genotypes, populations, species