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Detection of coloured stimuli by honeybees: minimum visual angles and receptor specific contrasts
The results suggest that green contrast can be utilized for target detection if target recognition has been established by means of the colour vision system.
Flies and flowers: taxonomic diversity of anthophiles and pollinators
Abstract The Diptera are the second most important order among flower-visiting (anthophilous) and flower-pollinating insects worldwide. Their taxonomic diversity ranges from Nematocera to Brachycera,…
The potential of cleptoparasitic bees as indicator taxa for assessing bee communities
It is proposed that functional diversity of bee communities offers a more consistent means of evaluation and suggested that cleptoparasitic bees in particular show much promise as indicator taxa.
Pollinators as bioindicators of the state of the environment: species, activity and diversity
- P. Kevan
- 1 June 1999
Honeybees and pollination guildes offer new means of assessing ecosystemic health because the species diversity and abundance relationship is changed from the log-normal standard expected from ecological principles and niche theory.
DNA barcoding a regional bee (Hymenoptera: Apoidea) fauna and its potential for ecological studies
- C. Sheffield, P. Hebert, P. Kevan, L. Packer
- Biology, MedicineMolecular ecology resources
- 21 April 2009
Most members of this well‐known fauna of Nova Scotia, Canada were resolved with particular clarity; the average intraspecific divergence was less than 0.5%, and COI sequences from over 75% of the province's species are now in the Barcodes of Life Data System.
The variability in settling velocities of some pollen and spores
The percentage of clustered spores and pollen was taken into account but was not found to significantly affect settling velocity except in the case of dyed oil palm, which tended to over-estimate the settling velocity of clumped spores of Lycopodium and of dyed pollen of oil palm.
Sun-Tracking Solar Furnaces in High Arctic Flowers: Significance for Pollination and Insects
- P. Kevan
- Biology, MedicineScience
- 29 August 1975
Heliotropic flowers act, in sunshine, as solar reflectors, their corollas focusing heat on the sporophylls, and these phenomena are important in maximizing the small heat budget.
Bumble Bee (Hymenoptera: Apidae) Activity and Pollination Levels in Commercial Tomato Greenhouses
Commercial greenhouse studies conducted to assess levels of pollination of tomato flowers in relation to bumble bee colony activity and colony densities found that an average activity of 2,000 bee trips per hectare per day was more than adequate to ensure sufficient pollination.