Detection of coloured stimuli by honeybees: minimum visual angles and receptor specific contrasts
- M. Giurfa, M. Vorobyev, P. Kevan, R. Menzel
- BiologyJournal of Comparative Physiology
- 1 May 1996
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
- B. M. Larson, P. Kevan, D. Inouye
- GeographyCanadian Entomologist
- 1 August 2001
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,…
Pollinators as bioindicators of the state of the environment: species, activity and diversity
- P. Kevan
- Environmental Science
- 1 June 1999
The potential of cleptoparasitic bees as indicator taxa for assessing bee communities
- C. Sheffield, A. Pindar, L. Packer, P. Kevan
- Environmental ScienceApidologie
- 21 February 2013
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.
DNA barcoding a regional bee (Hymenoptera: Apoidea) fauna and its potential for ecological studies
- C. Sheffield, P. Hebert, P. Kevan, L. Packer
- BiologyMolecular 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
- F. Di-Giovanni, P. Kevan, M. Nasr
- Environmental Science
- 1 February 1995
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.
Insect pollination of high Arctic flowers
- P. Kevan
- Environmental Science
- 5 August 1972
Sun-Tracking Solar Furnaces in High Arctic Flowers: Significance for Pollination and Insects
- P. Kevan
- Environmental ScienceScience
- 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
- L. Morandin, T. Laverty, P. Kevan
- Biology, MedicineJournal of Economic Entomology
- 1 April 2001
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.
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