This paper consists of some of the results of a collecting trip made by the senior author to the Grand Mesa National Forest, Colorado, during the period of June 12 to July 20, 1930. Al? though the fungi here discussed represent only a small percentage of the total number of collections, it seems tha

The arrival-departure process of bees on flowers and the immigration-extinction process of species on islands are contrasted, and the value of the stochastic, species-level approach to community composition is briefly discussed.

The addition of nectar to pollen-rewarding plants resulted in modest increases in per-flower pollinator visit duration and pollen transfer, but had no effect on reproduction because, at the place and time the experiment was conducted, plants were not pollen-limited. These results suggest that a poll

This note derives from work done during an NSF predoctoral fellowship at the University of California, Santa Barbara (UCSB).

Abstract Global change drivers, such as nitrogen (N) deposition and non‐random species extinctions, may shift interactions among aboveground and belowground communities. However, tightly coupled interactions between aboveground and belowground organisms may buffer ecosystems to global change. Here,

Abstkact. -Bracliijla^us i.s ciiircntK a inonotNiiic ^I'liu.s ol unct'itaiii oiitiiiis and known only from Iloloccne and late Raiicholabrean. A new species ot leporid is clescrii)ed from the early and middle Pleistocene (Irvinj^tonian) deposits of Poreiipine Cave, Park CountN; Colorado. Stratified d

Using the same methods as Britten, my associates and I ran Pollard transects during four flight seasons at Redcloud Peak and during three flight seasons (1991-93) at Mt. Uncompahgre and found that the populations are declining precipitously, genetic analyses show low heterozygosity, and no heroic ef

Shale bedrocks hold Earth’s largest carbon inventory. Although water is recognized for cycling elements through terrestrial environments, understanding how hydrology controls ancient rock carbon (Crock) release is limited. Here we measured depth- and season-dependent subsurface water fluxes and pore

SummaryThree species of Corixidae (Hemiptera : Heteroptera) were studied in thirty montane, sub‐alpine, and alpine ponds in Western Colorado. Callicorixa audeni Hung, had the widest altitudinal range (2800‐3400 m). Cenocorixa bifida Hung, was most common in montane ponds. Arctocorisa lawsoni Hung, w

A simple, portable system for the automatic collection and storage of radio-telemetry data is described. Data on the deep body temperatures of two yellow-bellied marmots (Marmota flaviventris) are reported for 3 days. The advent of radio-telemetry has initiated the development of few automated recor

Historical and future drought and surplus periods in the Colorado River basin are evaluated based on eight climate scenarios. Unimpaired streamflow from 17 stations in the Colorado River are evaluated based on U.S. Geological Survey, Bureau of Reclamation, and Coupled Modeled Intercomparison Project

The anisotropy of magnetic susceptibility (AMS) in sedimentary rocks results from depositional, diagenetic, syn- and post-sedimentary processes that affect magnetic grains. Some studies have also shown the potential role played by post-depositional fluid flow in detrital and carbonate formations. He

Abstract Mountainous watersheds are characterized by variability in functional traits, including vegetation, topography, geology, and geomorphology, which determine nitrogen (N) retention, and release. Coal Creek and East River are two contrasting catchments within the Upper Colorado River Basin tha

It is indicated that accurate predictive models of forb and shrub biomass can frequently be easily obtained using simple linear regression and cover or volume data.