Journal Article Adaptation of Heart and Lung Weight to High Altitude in the Robin Get access William A. Dunson William A. Dunson Department of Biology, Yale University, New Haven, Connecticut Present address: Department of Zoology, University of Michigan, Ann Arbor, Michigan Search for other works b

Research Article| May 30, 2018 Ammoniozippeite, a New Uranyl Sulfate Mineral from the Blue Lizard Mine, San Juan County, Utah, and the Burro Mine, San Miguel County, Colorado, USA Anthony R. Kampf; Anthony R. Kampf § Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Expo

ABSTRACTAim The shape of a species' spatial abundance distribution may change with spatial scale. We predict that the shape will typically change from strictly downward‐sloping (falling) to humped (rising then falling) as the spatial scale increases. The prediction, motivated in part by central limi

We examined the energy expenditure of adult male yellow-bellied marmots (Marmota flaviventris) and its relationship to various female-defense characteristics critical to male reproductive success. Resting metabolic rates of males were estimated in the laboratory via oxygen-consumption analysis, and

A narrow zone of sericitic alteration encases the Boulder County ferberite veins, but gives way abruptly to a wide outer envelope of argillized rock. The mineralogy indicates sustained attack by early acid solutions that finally changed to neutral and alkaline solutions. Sericitic alteration is cons

In a variety of taxa, individuals behave in consistently different ways. However, there are relatively few studies that empirically test the potential mechanisms underlying the causes and maintenance of these personality differences. Several hypotheses for the causes and maintenance of risky persona

Conditions necessary for intraspecific competition for pollinator service, but not intraspecific competition itself, have previously been reported for a population of Polemonium foliossisimum Gray. As in most recent work of this sort, this conclusion was based, in part, on seed set differentials amo

This study presents 11 years of nesting success and phenology data for Black Swifts (Cypseloides niger) at Box Canyon in Ouray, Colorado. Nest data were recorded on a near-daily basis for 160 nest attempts. Nesting success was 72% and mean and extreme dates of nesting events, including arrival, egg-

AbstractMaintenance of genetic diversity is important for conserving species, especially those with fragmented habitats or ranges. In the absence of natural dispersal, translocation can be used to achieve this goal, although the success of translocation can be difficult to measure. Here we evaluate

Animals with complex life cycles often show large variation in the size and timing of metamorphosis in response to environmental variability. If fecundity increases with body size and large individuals are more vulnerable to predation, then organisms may not be able to optimize simultaneously size a

Cheek-marking in yellow-bellied marmots (Marmota flaviventris) was studied by observations of cheek-marking in two colonies from 10 June to 6 August, 1996 and by experimental studies of responses to olfactory secretions from the perioral gland. The rate of cheek-marking declined significantly as the

Larvae of black flies (Simuliidae) serve as hosts for a number of Trichomycetes. Not infrequently several taxa of these fungi occur simultaneously in individual larvae. The larval hindguts may contain, for instance, species of the genus Paramoebidium (Amoebidiales) to? gether with species of one or

AbstractWe investigate herein the hypothesis that there is a significant relationship between bed particle mobility and benthic invertebrate abundance in the gravel‐bed channel of the upper Colorado River in Rocky Mountain National Park. A large diversion channel called the Grand Ditch normally dive

Abstract. Climate change is reshaping vulnerable ecosystems, leading to uncertain effects on ecosystem dynamics, including evapotranspiration (ET) and ecosystem respiration (Reco). However, accurate estimation of ET and Reco still remains challenging at sparsely monitored watersheds, where data and

Many animal signals used for mate choice assessment are condition dependent, but less is known about the condition dependence of other biologically important signals. We asked whether yellow-bellied marmot (Marmota flaviventer) alarm calls varied as a function of parasite infection and/or neutrophil

Hyporheic zones act as critical ecological links between terrestrial and aquatic systems where redox-sensitive metals of iron (Fe) and manganese (Mn) significantly impact nutrient cycling and water quality. However, the geochemical controls on the release and speciation of Fe(II) and Mn(II) in these

Research Article| May 01, 1990 Polyphase suprastructure deformation in metasedimentary rocks of the Uncompahgre Group: Remnant of an early Proterozoic fold belt in southwest Colorado CHARLES W. HARRIS CHARLES W. HARRIS 1Department of Geological Sciences, Virginia Polytechnic Institute and State Univ

Yellow-bellied marmots are studied to suggest a new way that social relationships can be beneficial: they increase perceptions of security and this ultimately may facilitate foraging and illustrate an effect of social relationships on predation risk assessment.