Plant architecture is crucial to pollination and mating in wind pollinated species. We investigate the effect of crown architecture on pollen dispersal, mating system and offspring quality, combining phenotypic and genotypic analyses in a low-density population of the endangered species Abies pinsap

Reproductive isolation due to pollinator behavior is considered a key mode of speciation in flowering plants. Although floral scent is thought to mediate pollinator behavior, little is known about its effects on pollinator attraction and floral visitation in the wild. We used field experiments with

The dispersion pattern of resources in a population of Delphinium nelsonii showed that subject plants and their neighbors were likely to have the same “temperature”, indicating that resources were patchy.

Hypothetically, flowers which have coevolved with pollination by hummingbirds could provide both energy and water balance simultaneously if they produced nectars of appropriate concentrations which depend upon environmental temperature.

Results from simulations suggest that competition for pollination through interspecific pollen transfer can result in rapid exclusion of one of two species, and that such competition represents a selective force promoting stable divergence of potential competitors in habitat affinity, flowering time

The simultaneous flowering of co—occurring plant species with similar pollinator affinities may result in interspecific pollen transfer and consequent fecundity reductions due to wastage of pollen, stigma surfaces, and effective pollinator visits. In such cases competition for pollination occurs and

To a hummingbird, clusters of flowers on inflorescences represent patches and provide an ideal situation to test prediction of optimal patch-use. The basic question is what decision rule should a hummingbird use to decide whether or not to leave an inflorescence? The hypothesis is that hummingbirds

Aquilegia elegantula Greene and A. caerulea James occur in montane and subalpine habitats in the southern Rocky Mountains of western North America. The red and yellow flowers of A. elegantula are nodding, odorless, protogynous, and secrete a concentrated (44%) sucrose nectar in the floral spurs. See

Fredrick T. Addicott, Flower Behavior in Linum lewisii: Some Ecological and Physiological Factors in Opening and Abscission of Petals, The American Midland Naturalist, Vol. 97, No. 2 (Apr., 1977), pp. 321-332

Journal Article Food Supply and Nest Timing of Broad-Tailed Hummingbirds in the Rocky Mountains Get access Nickolas M. Waser Nickolas M. Waser Department of Ecology and Evolutionary Biology, University of Arizona, Tuscan, Arizona 85721 and Rocky Mountain Biological Laboratory, Crested Butte, Colorad

Journal Article Possible Impairment of Nest-Building of Hummingbirds by Acetate Leg Tags Get access Nickolas M. Waser, Nickolas M. Waser Department of Biological Sciences The University of Arizona Tucson, Arizona 85721 Rocky Mountain Biological Laboratory Crested Butte, Colorado 81224 Search for oth

This note derives from work done during an NSF predoctoral fellowship at the University of California, Santa Barbara (UCSB).

PHYSIOLOGIcAL homeostasis is maintained with energy that a bird must extract from its environment. Effective investment of the bird's time in exchange for the necessary energy must be the objective of maintenance strategy. If the rate of intake is less than the metabolic rate over a period of time,