Though rarely experimentally tested, biotic interactions have long been hypothesized to limit low-elevation range boundaries of species. We tested the effects of herbivory on three alpine-restricted plant species by transplanting plants below (novel), at the edge (limit), or in the center (core) of

Data were collected as part of a study of population dynamics of solitary, cavity-nesting Hymenoptera. Nesting structures (“trap-nests”) were established at five study sites along an elevational gradient around the Rocky Mountain Biological Laboratory in 2013. Two additional study sites were added i

A dataset containing 648 species occurrences available in GBIF matching the query: { "DatasetKey" : [ "is Rocky Mountain Biological Laboratory Mammal Collection" ] } The dataset includes 648 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0164883-220831081235567/

Though rarely experimentally tested, biotic interactions have long been hypothesized to limit low-elevation range boundaries of species. We tested the effects of herbivory on three alpine-restricted plant species by transplanting plants below (novel), at the edge (limit), or in the center (core) of

Kurt C. VerCauteren, Nathan W. Seward, Michael J. Lavelle, Justin W. Fischer, and Gregory E. Phillips. Rangeland Ecology & Management 60(5). September 2007.

AbstractRelatively little is known about the effects of specific parasites on sexually selected behavioral traits. We subjected free‐living mountain white‐crowned sparrows (Zonotrichia leucophrys oriantha) to a playback experiment to identify the effect of hemosporidian parasites on potentially sexu

Summary1. In lentic freshwater habitats, the composition of animal assemblages shifts along a gradient from temporary to permanent basins. When habitats with different degrees of permanence are at the scale of the home range of species, they constitute alternatives in terms of energy acquisition thr

Bird communities associated with differing cliff variables in Jefferson County, Colorado, were sampled using point counts. Species-specific density estimates and community diversity values were compared among four cliff types: small cliffs, medium cliffs, large cliffs, and non-cliff sites. A model s

As human population and concomitant development increase, human-caused disturbances play an ever larger role in the fitness of wildlife. An increasing number of studies have implicated anthropogenic disturbance in having harmful effects on birds and other wildlife. Most studies, however, concentrate

Abstract We investigated nest-hole excavation by the Red-naped Sapsucker (Syphrapicus nuchalis) in aspen (Populus tremuloides) woodlands in western Colorado. Sapsuckers excavate nest cavities primarily in aspens infected with a heartwood rot fungus (Phellinus tremulae), which softens the heartwood o

It is suggested that body size and age of first reproduction are important in explaining variation in disturbance tolerance in birds, and that species that capture live prey and those that are highly social are relatively wary.

Auditory, visual, and olfactory cues of predator presence create a landscape of fear for prey animals. Prey can respond to predation risk perceived from these cues by increasing vigilance, increasing group size, altering habitat use, and reducing activity times. State of the animal and predator type

In subalpine Colorado ecosystems, red-naped sapsuckers feed by excavating sap wells in shrubby willow branches. Many species of insects, birds, and mammals are known to feed from this sap. Previous studies on avian sap robbers suggest these sap wells may have a direct effect on bird communities. Fur

The impacts of growing deer populations upon biodiversity have caused concern for ecologists since it is speculated that certain species of herbs are targeted and over abundantly browsed. This study investigated deer abundance as well as intensity of deer browsing of herbaceous plants inside and out