685 results — topic: Flowering & Pollination
Data from: Integrating viability and fecundity selection to illuminate the adaptive nature of genetic clines
Genetically-based trait variation across environmental gradients can reflect adaptation to local environments. However, natural populations that appear well-adapted often exhibit directional, not stabilizing, selection on ecologically-relevant traits. Temporal variation in the direction of selection
Data from: Foraging strategy predicts foraging economy in a facultative secondary nectar robber
In mutualistic interactions, the decision whether to cooperate or cheat depends on the relative costs and benefits of each strategy. In pollination mutualisms, secondary nectar robbing is a facultative behavior employed by a diverse array of nectar-feeding organisms, and is thought to be a form of c
Adaptive nature of floral nectar production rate for the hummingbird-pollinated plant <i>Ipomopsis aggregata</i>
Variation in receptive stigma time after pollination of <i>Aquilegia caerulea</i>
Resource availability and gender variation among flowers on inflorescences of <i>Aquilegia caerulea</i>
Analysis of nectar standing crop in <i>Helenium hoopsii</i>: spatially independent standing crop variation over time
The effects of patterns of flower coloration on insect variation
Effects of "nectar guides" on pollinator visitation and seed set
Dominant flower colors: shade vs. sun
Energy reallocation in reproductive function of <i>Ipomopsis aggregata</i> after loss of floral tissue
Abilities of hummingbirds to discern nectar quality from feeders
The effects of floral morphology on interspecific pollen transfer in <i>Ipomopsis</i>
Age or pollinator manipulation causing banner petal color change in <i>Lupinus argentus</i> (Fabaceae)
Heterogeneity among floral visitors leads to discordance between removal and deposition of pollen
Flowers are often visited by many species of animals. \nThese sometimes differ in size, behavior, and other \ncharacteristics that translate into differences in their effectiveness as pollinators. The differences \nmay be manifest in their effect on reproductive \nsuccess either thro
Reproductive costs of self-pollination in Ipomopsis aggregata: are ovules usurped?
In common with many cosexual angiosperms, the hummingbird‐pollinated montane herb Ipomopsis aggregata (Polemoniaceae) is likely to experience self‐pollination. Does this incur a fecundity cost even in such a highly self‐sterile (presumably self‐incompatible) species? Histological studies showed that
Outcrossing distance effects in <i>Delphinium nelsonii</i>: pollen loads, pollen tubes, and seed set
Effects of snowpack on the timing and abundance of flowering in Delphinium nelsonii: implications for climate change
Delphinium nelsonii is an early‐blooming herbaceous perennial of montane western North America, which we studied in dry subalpine meadows in the Colorado Rocky Mountains. We examined the effects of variation in annual snowfall between 1973 and 1989 on the timing and abundance of flowering. During ye
The effect of floral abundance on feeder censuses of hummingbird populations
Numbers of Broad-tailed Hummingbirds (Selasphorous platycercus) captured each summer from 1979-1989 at the Rocky Mountain Biological Laboratory were quite variable, ranging from 115 (1981) to 348 (1989), with new birds usually outnumbering returning (previously banded) birds. Capture numbers were ne
Components of Phenotypic Selection: pollen export and flower corolla width in Ipomopsis aggregata
Diane R. Campbell, Nickolas M. Waser, Mary V. Price, Elizabeth A. Lynch, Randall J. Mitchell, Components of Phenotypic Selection: Pollen Export and Flower Corolla Width in Ipomopsis aggregata, Evolution, Vol. 45, No. 6 (Sep., 1991), pp. 1458-1467
Effects of floral traits on sequential components of fitness in Ipomopsis aggregata
The total number of viable, undamaged seeds released by a plant provides an estimate of female reproductive success (RS). I outline a method for analyzing pollinator-mediated selection based on partitioning female RS into four multiplicative components: number of flowers, pollen received per flower,