It is concluded that either temporal differences or size differences of copepodids and adults would allow coexistence and that extreme size differences are probably unimportant compared to morphological differences of feeding appendages and perhaps behavioral differences.

Twelve 42—liter plankton cages were used in an alpine Colorado pond to test a size—efficiency hypothesis: to determine why small herbivorous zooplankton species tend not to coexist with large species. The size—efficiency hypothesis, that large species exclude the smaller ones through competition for

The distributions of pocket gopher species in Colorado are contiguously allopatric. The pattern has been attributed to competitive exclusion, perhaps due to aggression toward the broad—niche species by more narrow—niche species. This study tested for differences in aggressiveness between the narrow—

Five populations of marmots were studied in Colorado from 1962 through 1972. Males are classified by age as yearlings, two‐year olds, and adults. Socially, marmots are colonial, peripheral, or transient. Each population was divided into four age‐sex classes, male yearlings, female yearlings, male ad

AbstractIntroduction of seepage and deep percolation losses to the saline soils and aquifers, and the eventual return of these flows to the river system with their large salt loads, make the Grand Valley in Colorado one of the more significant salinity sources in the Upper Colorado River Basin. A st

Sufficient evidence has accumulated over the last six years to show that the leopard frogs (Rana pipiens, sensu lato) of North America actually include several forms that merit recognition as distinct species.Littlejohn and Oldham (1968) showed that four essentially allopatric forms, recognizable on

Coal Creek (CC) is a high-elevation, headwater tributary to the Upper Colorado Basin located in the Ruby-Anthracite Range in the central Colorado Rocky Mountains. The CC watershed is 53 km2 in area and ranges in elevation from 2712 to 3668 meters. CC originates near Lake Irwin and enters the Slate R

*This resource is embargoed until fall 2022. Please stay tuned or contactczdata@colorado.edu for more information. Spring and stream sampling across Coal Creek watershed during summer of 2021 (June-October) to estimate groundwater chemistry. Sampled Approximately weekly for synoptic sampling of Coal

*This resource is embargoed until fall 2022. Please stay tuned or contactczdata@colorado.edu for more information. Spring and stream sampling across Coal Creek watershed during summer of 2021 (June-October) to estimate groundwater chemistry. Sampled Approximately weekly for synoptic sampling of Coal

Saccardi and Winnick Data contains the East River sample data including chemistry and corrected pCO2 data (n=162) with the included column denoting whether data points were represented by NHDplus data point (n=121) and therefore used in the model.