685 results — topic: Flowering & Pollination
Data from: Reproductive losses due to climate change-induced earlier flowering are not the primary threat to plant population viability in a perennial herb
1. Despite a global footprint of shifts in flowering phenology in response to climate change, the reproductive consequences of these shifts are poorly understood. Furthermore, it is unknown whether altered flowering times affect plant population viability. 2. We examine whether climate change-induce
Data from: The individual and combined effects of snowmelt timing and frost exposure on the reproductive success of montane forbs
1. Changes from historic weather patterns have affected the phenology of many organisms worldwide. Altered phenology can introduce organisms to novel abiotic conditions during growth and modify species interactions, both of which could drive changes in reproduction. 2. We explored how climate change
Olfactory versus visual cues in a floral mimicry system
It is found that pseudoflower fragrance can attract visitors by itself, and the ability of insects to differentiate pseudoflowers from true flowers by their fragrance may be important in the evolution of the mimicry system.
Hummingbird behavior and mechanisms of selection on flower color in <i>Ipomopsis</i>
Patterns of color and nectar variation across an <i>Ipomopsis</i> (Polemoniaceae) hybrid zone
Hybridization may uncouple adaptive trait combinations that are present in parental species. I studied variation in flower color and reward quality across a hybrid zone of Ipomopsis aggregata and I. tenuituba. Individuals from hybrid populations showed considerable variation in flower color using co
Analysis of pollinator foraging: tests for non-random behavior
1. A standardized protocol for analysing the behaviour of pollinators foraging on more than one plant type (species or morph) is needed. 2. A protocol is presented in which the first step is to test whether foraging trips are homogeneous in the frequency of visits to each plant type, or whether ther
Analyzing pollinator-mediated selection in a plant hybrid zone: hummingbird visitation patterns on three spatial scales
Clines across hybrid zones can be produced by several forms of natural selection. We illustrate an approach to studying pollinator-mediated selection in plant hybrid zones, using two species of Ipomopsis (Polemoniaceae) as a model system. We measured visitation to flowers in natural and experimental
Genetic and environmental variation in life-history traits of a monocarpic perennial: a decade-long field experiment
Directional and stabilizing selection tend to deplete additive genetic variance. On the other hand, genetic variance in traits related to fitness could be retained through polygenic mutation, spatially varying selection, genotype-environment interaction, or antagonistic pleiotropy. Most estimates of
Genetic correlation between biomass allocation to male and female functions in a natural population of <i>Ipomopsis aggregata</i>
Effects of experimental manipulation of inflorescence size on pollination and pre-dispersal seed predation in the hummingbird-pollinated plant <i>Ipomopsis aggregata</i>
Fluctuating asymmetry and reproductive successin Delphinium nelsonii
Floral biology
Noteworthy collections: Colorado
Floral mimicry, coevolution of hosts and pathogens, and stress tolerance versus resistance to pathogens
Resource partitioning and per-flower foraging efficiency in two bumblebee species
Mechanisms of hummingbird-mediated selection for flower width in <i>Ipomopsis aggregata</i>
Evolution of floral traits in a hermaphroditic plant: field measurements of heritabilities and genetic correlations
Genetic variances, heritabilities, and genetic correlations of floral traits were measured in the monocarpic perennial Ipomopsis aggregata (Polemoniaceae). A paternal half-sib design was employed to generate seeds in each of four years, and seeds were planted back in the field near the parental site