Volatile production by the buds and corollas of two sympatric, confamial plants, Ipomopsis aggregata and Polemonium foliosissimum
Oviposition choices by a pre-dispersal seed predator (Hylemya sp.). I. Correspondence with hummingbird pollinators and the role of plant size, density, and floral morphology
Oviposition choices by a pre-dispersal seed predator (Hylemya sp.). II. A positive association between female choice and fruit set
A model of inter-cohort cannibalism and paedomorphosis in Arizona tiger salamanders, <i>Ambystoma tigrinum nebulosum</i>
Cannibalism is widespread in size-structured populations. If cannibals and victims are in different life stages, dominant cohorts of cannibals can regulate recruitment. Arizona Tiger Salamanders, Ambystoma tigrinum nebulosum, exhibit facultative paedomorphosis in which salamander larvae either metam
Ecological Feedbacks to Global Warming: Extending Results from Plot to Landscape Scale
A PIT tagging technique for Ambystomatid salamanders
Can <i>Speyeria mormonia</i> detect nectar in a floret? A study in butterfly foraging behavior
Variation in timing and abundance of flowering by <i>Delphinium barbeyi</i> Huth (Ranunculaceae): the roles of snowpack, frost, and La Niña, in the context of climate change
Factors correlated with the productivity and distribution of temperate ants of the genus <i>Myrmica</i>
Sex ratio and reproductive success along elevational gradients of gynodioecious populations of <i>Geranium richardsonii</i>
We studied the sex-ratio and reproductive success of gynodioecious populations of Geranium richardsonii along elevational gradients near Gothic, Colorado. Gynodioecious means that the species produces hermaphrodite and female plants. The hermaphrodites have male (anthers and pollen) and female (ovul
Temperature and light intensity effects on the feeding rates of fairy shrimp (<i>Branchinecta</i>)
Influence of Parasitism on Consumer Driven Nutrient Recycling by Aquatic Insects
Parasites have only recently gained the attention they deserve in studies involving their role in ecosystems. Using ecological stoichiometry will allow parasite roles to be established. I attempted to establish parasite effects on hosts by measuring the excretion Nitrogen:Phosphorus of infected Mega
How do Plant Traits Affect Thermoregulation?
Plants are known to regulate their leaf temperature, undergoing limited homeothermy. This may advantageous as it allows plants to utilize important photosynthetic and respiratory enzymes. We studied which traits affect a plant’s ability to regulate their temperature across highly variable air temper
Life history consequences of social complexity: a comparative study of ground-dwelling sciurids
Effects of snow-melt timing on three high altitude Potentilla (Rosaceae) species: growth, reproduction, and distribution
Larval feeding behavior and leaf components that affect the survival of <i>Pieris macdunnoughii</i> on the invasive mustard <i>Thlaspi arvense</i>
Pieris macdunnoughii, a butterfly native to the Rock Mountains in Colorado, is a specialist on mustard plants. An invasive mustard, Thlaspi arvense, introduced approximately 100 years ago creates an evolutionary trap for P. macdunnoughii due to the chemical signals that encourage ovipositioning, but
The Changing Floral Color Landscape Across an Alpine Elevation Gradient
Flowers at high elevation must deal with less than ideal conditions, both abiotic and biotic. A limiting biotic factor plants must cope with at high elevations is pollinator limitation. With increasing elevation, insect groups such as Hymenoptera decrease with abundance whereas the abundance of Dipt
Assessing pollinators’ contribution to the reproductive success of <i>Mertensia ciliata</i>
Shifting flowering phenologies as a result of climate change have the potential to disrupt plant-pollinator interactions through changes in temporal overlap of flowering and pollinator activity, decreasing plant fitness. Understanding current plant-pollinator interactions is key to predicting how pl