Allocation of stored and incoming nutrients to reproduction determines an organism’s age-specific fecundity curve. In holometabolous insects, differences among species in the shape of the curve are correlated with differences in the potential importance of adult food to reproduction. I examined allo

Abstract. 1. Patterns of worker demography in the ant Formica neorufibarbis were documented under natural conditions. 2. Some workers lived at least 4 years. 3. In 4 of 5 years, colonies were more likely to retain older workers than new workers. 4. Workers persisted for more years in colonies lackin

Nonconsumptive effects of predators can have knock-on effects on prey fitness, life history and population dynamics. However, the origin of cues stimulating predator avoidance behaviour and the mechanisms underlying prey responses need further investigation. Previous studies revealed that nonconsump

The U.S. Department of Energy’s (DOE) East River community observatory (ER) in the Upper Colorado River Basin was established in 2015 as a representative mountainous, snow-dominated watershed to study hydrobiogeochemical responses to hydrological perturbations in headwater systems. Led by the Waters

The nonlinearity and fear hypothesis predicts that the structure of alarm vocalizations will be influenced by the signaller's internal state. Specifically, stressed or otherwise more aroused individuals will produce alarm calls that are relatively more nonlinear (i.e. they sound noisier). The positi

Fractures are integral to the hydrology and geochemistry of watersheds, but our understanding of fracture dynamics is very limited because of the challenge of monitoring the subsurface. Here we provide evidence that long-term, high-frequency measurements of the river concentration of the ultra-trace

The abiotic environment drives species abundances and distributions both directly and indirectly through effects on multi-trophic species interactions. However, few studies have documented the individual and combined consequences of these direct and indirect effects. We studied an ant-tended aphid a

Abstract. 1. Mating patterns in a natural population of checkerspot butterflies, Euphydryas editha Boisduval, were investigated by dusting male external genitalia with fluorescent dyes and examining mated females under UV light. 2. These dyes may have diverse applications in studies of insect popula

In eusocial insects, chemical communication is crucial for mediating many aspects of social activities, especially the regulation of reproduction. Though queen signals are known to decrease ovarian activation of workers in highly eusocial species, little is known about their evolution. In contrast,

Disruptions to functionally important symbionts with global change will negatively impact plant fitness, with broader consequences for species' abundances, distribution, and community composition. Fungal endophytes that live inside plant leaves and roots could potentially mitigate plant heat stress

Abstract The Proterozoic tectonic evolution of the southwestern USA remains incompletely understood due to limited constraints on the timing and conditions of the tectono-metamorphic phases and depositional age of metasedimentary successions. We integrated multi-scale compositional mapping, petrolog

Research Article| February 01, 1988 Petrology of flecked gneisses in the northern Wet Mountains, Fremont County, Colorado ROBERT B. TRUMBULL ROBERT B. TRUMBULL 1Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131 Search for other works by this author on: GSW Google Scholar

AbstractThis article examines the effect of recreational cannabis dispensary sales on traffic crashes by employing difference‐in‐differences model that exploits the variation in the timing of recreational marijuana dispensary entry across counties within Colorado. Using marijuana‐related hospital di

AbstractAimAnt communities are believed to be structured by competition, with dominant species competitively excluding subordinates (the dominance–impoverishment rule). However, a high number of seemingly similar species coexist, possibly due to interspecific trade‐offs. Here, we examine the evidenc

Nineteen species of noncrustose lichens were found on juniper bark. Of these, three species had relatively high cover and frequency values and were characterized as typical lichens of Rocky Mountain junipers: Xanthoria fallax, Phaeophyscia hirsuta and Physcia caesia. Total cover per tree was low (4%

Patterns of egg distribution and survivorship were examined for six generations of a univoltine population of the pierid butterfly Colias alexandra, finding that among clumped individuals, survivorship is two times greater for the first or previously-laid individual than the second or subsequently-

While many studies document specific human impacts on the behaviour and physiological responses of wildlife to humans

The Gothic and Maroon formations are the most significant Upper Paleozoic lithogenetic units between Copper Creek and Glenwood Springs, Colorado. Thin limestones were traced southward from Glenwood Springs to Redstone and furnish local horizons of time-rock correlation. They do not, however, mark th