The data here are associated with Quaternary Research manuscript Latest Pleistocene glacial chronology and paleoclimate reconstruction for the East River watershed, Colorado, USA and include data associated with cosmogenic exposure and depth profile dating as well as glacier-climate numerical modeli

Habitat fragmentation and degradation impacts an organism's ability to navigate the landscape, ultimately resulting in decreased gene flow and increased extinction risk. Understanding how landscape composition impacts gene flow (i.e., connectivity) and interacts with scale is essential to conservati

To understand parent-hybrid dynamics in cinquefoil (Potentilla) species in the Colorado Rocky Mountains, I am estimating environmental overlap among parents and hybrids, interbreeding among parents and hybrids, and hybrid population growth in multiple natural populations at NWT and (not included her

To understand parent-hybrid dynamics in cinquefoil (Potentilla) species in the Colorado Rocky Mountains, I am estimating environmental overlap among parents and hybrids, interbreeding among parents and hybrids, and hybrid population growth in multiple natural populations at NWT and (not included her

Robert W. Frank. 2017.

Phenotypic plasticity, the ability of an individual to modify its phenotype according to the conditions it experiences, is a source of between-individual variation and a mechanism by which individuals can cope with environmental change. Plasticity is expected to evolve in response to environmental h

Riparian zones often provide more food or nesting resources than surrounding ecosystems and thus support more species or a greater abundance of birds. However, the extent to which the positive effects of riparian zones extend into adjoining habitats has rarely been investigated. We examined bird spe

Strong circumstantial evidence from laboratory and theoretical studies suggests that sublethal parasite burdens can influence host population dynamics whether acting alone or in conjunction with reduced food availability. The significance of these effects has rarely been examined in natural environm

Judging from two palatable wildflower species whose seed crop and seedling recruitment were greatly reduced near the field station, the coyote–deer–wildflower trophic cascade has the potential to influence plant community composition.

Abstract Human activity has been shown to influence how animals assess the risk of predation, but we know little about the spatial scale of such impacts. We quantified how vigilance and flight behavior in mule deer Odocoileus hemionus varied with distance from an area of concentrated human activity—

The hypothesis that patterns of sex-biased dispersal are related to social mating system in mammals and birds has gained widespread acceptance over the past 30 years. However, two major complications have obscured the relationship between these two behaviors: 1) dispersal frequency and dispersal dis

We investigated the impacts of an unpaved road on the distribution, reproduction, and stress physiology of Mountain White-crowned Sparrows (Zonotrichia leucophrys oriantha) in a high-elevation subalpine ecosystem. We found and monitored 152 sparrow nests over 3 years and captured 123 sparrows over 2

AbstractGunnison sage‐grouse (Centrocercus minimus) is a species of special concern and is currently considered a candidate species under Endangered Species Act. Careful management is therefore required to ensure that suitable habitat is maintained, particularly because much of the species' current

Tree swallow (Tachycineta bicolor) nestlings, eggs, and diet and sediment grab samples were used to quantify risks of exposure to15 trace elements, 31 polychlorinated biphenyl (PCB) congeners, 15 polybrominated diphenyl ether (PBDE) congeners and 13 organochlorine pesticides in the Calumet area of n

Solitary mason bees in the family Megachilidae are known to be important pollinators worldwide. They are important pollinators of natural ecosystems and also are widely used for the commercial pollination of crop plants such as almonds, cherries, peaches, plums, and apples. Given that they are such

Many, but not all, animals respond to the sounds of their predators to assess predation risk. For those that can, does this ability persist after a predator has gone extinct? Are all predatory species equally likely to generate antipredator responses? And, more generally, what are the proximate mech

Parasites can both influence and be affected by host population dynamics, and a growing number of case studies support a role for parasites in causing or amplifying host population cycles. In this study, we examined individual and population predictors of gastrointestinal parasitism on wild cyclic m

Individuals are generally predicted to avoid inbreeding because of detrimental fitness effects. However, several recent studies have shown that limited inbreeding is tolerated by some vertebrate species. Here, we examine the costs and benefits of inbreeding in a largely polygynous rodent, the yellow

Individuals may obtain valuable information about the presence of predators by eavesdropping on heterospecific alarm signals. While playback studies have demonstrated that similarly-sized and taxonomically-related species may respond to the calls of each other, less work has been done to define the