2,139 results — topic: RMBL & Gothic
Snow-free Freezing Degree-days 0-60 Days Post Snow Mean (2002-2021)
This is a map of accumulated snow-free freezing potential (freezing degree days, FDD) for the Upper Gunnison domain, derived from daily minimum temperature maps interpolated from weather station and microclimate sensor data combined with Landsat-derived estimates of the timing of seasonal snowpack d
Snow-free Growing Degree-days Annual Mean (2002-2021)
This is a map of accumulated snow-free growing potential (snow-free growing degree days, SFGDD) for the Upper Gunnison domain, derived from daily maximum air temperature maps interpolated from weather station and microclimate sensor data combined with Landsat-derived estimates of the timing of seaso
The relation between premolar wear and age in the yellow-bellied marmot, Marmota flaviventris
Relative success of self and outcross pollen comparing mixed- and single-donor pollinations in <i>Aquilegia caerulea</i>
Flowers frequently receive both self (S) and outcross (OC) pollen, but S pollen often sires proportionally fewer seeds. Failure of S pollen can reflect evolved mechanisms that promote outcrossing and/or inbreeding depression expressed during seed development. The relative importance of these two pro
Adaptive significance of <i>Ipomopsis aggregata</i> nectar production: pollination success of single flowers
Testing evolutionary and ecological hypotheses using path analysis and structural equation modelling
The use of path analysis has grown rapidly in recent years, yet few studies employ recent advances in the field of structural equation modelling (SEM). Here I illustrate the capabilities of SEM for path analyses, using data from a study of hummingbird pollination. The main drawback to conventional p
Adaptive significance of Ipomopsis aggregata nectar production: observation and experiment in the field
Anthophilous fly distribution across an elevation gradient
-Flower-visiting Diptera are abundant in montane and Arctic areas. This research, conducted on the western slope of the Colorado Rocky Mountains: (1) characterizes the predominant anthophilous fly taxa in comparison with other high-elevation and highlatitude sites; (2) examines changes in fly abunda
the Unique Value of Biological field stations
Observations of a high altitude population of the sage stem-galling fly Eutreta diana (Diptera: Tephritidae) and its associated parasitoids
Sapsuckers, swallows, aspen, willow, and rot
Plant size, geitonogamy, and seed set in <i>Ipomopsis aggregata</i>
Factors in recovery of subalpine vegetation studied (Colorado)
Variation in sex allocation and floral morphology in Ipomopsis aggregata (Polemoniaceae)
Intrapopulational variation in biomass allocation to male vs. female function was quantified for the hermaphroditic plant Ipomopsis aggregata in terms applicable to sex allocation models. The proportions of flower biomass put into the corolla and calyx averaged 0.59 and 0.20 and were relatively cons
The spatial scale of genetic differentiation in a hummingbird-pollinated plant: comparison with models of isolation by distance
We examined patterns of genetic differentiation at isozyme loci in natural populations of Ipomopsis aggregata, for which distances of gene flow had been previously estimated. Using genetic neighborhood areas based on direct estimates of gene flow to define subpopulations, we found that FST values (t
Ten years on an aspen branch
Ventilatory and metabolic dynamics during entry into and arousal from torpor in Selasphorus hummingbirds
Sex allocation in hermaphroditic plants
Although the empirical evidence lags behind the theoretical development, sex-allocation theory has been quite successful at predicting trends among populations.