Results 121 to 130 of about 11,229 (159)

INHERITANCE OF NECTAR PRODUCTION IN BIRDSFOOT TREFOIL

Canadian Journal of Plant Science, 1982
Significant differences in nectar production were observed among seven cultivars and one germplasm release of birdsfoot trefoil (Lotus corniculatus L.). The cultivars Carroll and Leo were consistently higher and Maitland consistently lower in μ1 nectar/umbel produced.
DOROTHY C. MURRELL, DWIGHT T. TOMES, R. W. SHUEL   +2 more
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Nectar Production and Pollination of Asclepias exaltata

Systematic Botany, 1986
Nectar production and pollination of the herbaceous perennial milkweed Asclepias exaltata were studied in three populations in southwestern Virginia. Individual flowers were available to pollinators, chiefly large bees and wasps, an average of 6.2 days. Volumes, concentrations, and amounts of sucrose in nectar decreased as flowers aged. Most nectar was
Robert Wyatt, T. Randolph Shannon
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Effect of Pollinators and Nectar Robbers on Nectar Production and Pollen Deposition in Hamelia patens (Rubiaceae)

Biotropica, 2003
ABSTRACTWe conducted experimental manipulations and field observations to determine the role of members of a nectarivorous guild (pollinators and robbers) on nectar production and pollen deposition in Hamelia patens at the La Selva Biological Station (Costa Rica).
Lasso, Eloisa, Naranjo, Maria Elena
openaire   +2 more sources

Morphological correlates of nectar production used by honeybees

Ecological Entomology, 2006
Abstract 1. Honeybees foraging on lavender have been shown to choose inflorescences that are larger and have more flowers. If they are selecting optimally then these inflorescences should yield higher net rates of energy gain.
A. D. HIGGINSON, F. S. GILBERT, C. J. BARNARD   +2 more
openaire   +1 more source

Nectar Production and Flower Visitors of Asclepias verticillata

American Midland Naturalist, 1979
Asclepias verticillata is self-incompatible and can propagate vegetatively. Nectar is produced mainly between 1800 and 2200 hr, throughout the 4-5 day life of the flower. Insect visitations at this time were infrequent on all four study sites, a seemingly anomalous situation ; most pollinia vectors visited the flowers during the day.
Mary F. Willson, Robert I. Bertin, Peter W. Price   +2 more
openaire   +1 more source

The Production of Dilute Nectars by Hummingbird and Honeyeater Flowers

Biotropica, 1981
A survey of data from tropical and temperate regions confirms that nectars of hummingbird and honeyeater flowers are dilute, especially relative to nectars of bee flowers. We use these data, along with theoretical considerations, to examine three recently proposed hypotheses to explain low concentration of hummingbird nectars.
Graham H. Pyke, Nickolas M. Waser
openaire   +1 more source

Effects of elevated CO 2 on flowering phenology and nectar production of nectar plants important for butterflies of calcareous grasslands

Oecologia, 1998
Effects of elevated CO2 on flowering phenology and nectar production were investigated in Trifolium pratense, Lotus corniculatus, Scabiosa columbaria, Centaurea jacea and Betonica officinalis, which are all important nectar plants for butterflies. In glasshouse experiments, juvenile plants were exposed to ambient (350 μl l-1) and elevated (660 μl l-1 ...
Hans Peter, Rusterholz, Andreas, Erhardt
openaire   +2 more sources

NECTAR PRODUCTION PATTERNS IN IPOMOPSIS AGGREGATA (POLEMONIACEAE)

American Journal of Botany, 1983
This study describes nectar production patterns for Ipomopsis aggregata and discusses their potential adaptive and ecological significance. It also examines the influence of environmental and other factors on nectar production rate (NPR) and nectar sugar concentration. For I. aggregata there were no NPR differences with flower age.
openaire   +1 more source

Seed Production in Alfalfa as Related to Nectar Production and Honeybee Visitation

Botanical Gazette, 1953
1. Nectar secretion in alfalfa in relation to honeybee visitation and seed production was studied at Logan, Utah, from 1946 to 1951. Clonally replicated representative selections of "alfalfa conference" breeding stocks were planted in replicated randomized blocks in field and greenhouse. 2.
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Effect of Pollinators and Nectar Robbers on Nectar Production and Pollen Deposition in Hamelia patens (Rubiaceae)1

BIOTROPICA, 2003
We conducted experimental manipulations and field observations to determine the role of members of a nectarivorous guild (pollinators and robbers) on nectar production and pollen deposition in Hamelia patens at the La Selva Biological Station (Costa Rica).
Eloisa Lasso, Maria Elena Naranjo
openaire   +1 more source