A5014403164- Insect and Arachnid Ecology and Behavior
- Plant and animal studies
- Insect and Pesticide Research
- Animal Behavior and Reproduction
- Neurobiology and Insect Physiology Research
- Insect-Plant Interactions and Control
- Ecology and Vegetation Dynamics Studies
- Insect Utilization and Effects
- Fossil Insects in Amber
- Bee Products Chemical Analysis
- Mosquito-borne diseases and control
- Phytochemical compounds biological activities
- Forest Insect Ecology and Management
- Publishing and Scholarly Communication
- Viral Infections and Vectors
- Insect Pheromone Research and Control
- Insect Pest Control Strategies
- African history and culture studies
- Hand Gesture Recognition Systems
- Entomological Studies and Ecology
- Airway Management and Intubation Techniques
- scientometrics and bibliometrics research
- Silk-based biomaterials and applications
- Academic Writing and Publishing
- Traditional and Medicinal Uses of Annonaceae
University of Pretoria
2014-2025
Academy of Science of South Africa
2017-2020
University of the Witwatersrand
1989-2019
California Institute of Technology
2017
Martin Luther University Halle-Wittenberg
2001-2012
Rhodes University
2001-2012
Federal Office for Agriculture
2012
Agroscope
2012
Centre National de la Recherche Scientifique
1999
South African Medical Research Council
1990
Abstract: Although pollinator declines are a global biodiversity threat, the demography of western honeybee ( Apis mellifera ) has not been considered by conservationists because it is biased activity beekeepers. To fill this gap in decline censuses and to provide broad picture current status honeybees across their natural range, we used microsatellite genetic markers estimate colony densities diversity at different locations Europe, Africa, central Asia that had patterns land use. Genetic...
SummaryThis study reports honey bee, Apis mellifera L., colony losses that occurred in South Africa over two consecutive years. The total were 29.6% (95% CI: 22.8–37.5) 2009–2010 and 46.2% 37.3–55.0) 2010–2011. Furthermore, the shows capensss worker social parasite, a problem unique to southern Africa, is main perceived cause, could explain significant differences number of between beekeepers using subspecies A. m. scutellata those capensis. In contrast previous studies North America Europe,...
The nutritional needs of bees are supplied by nectar carbohydrates and protein other nutrients in pollen but little is known how achieve balance. Using newly emerged caged worker honeybees (Apis mellifera scutellata), we investigated whether maintain their intake target when confined to pairs imbalanced complementary diets varying carbohydrate (P:C) ratio. Diets were formulated using three sources [casein, royal jelly or Feed-Bee (a natural substitute)] sucrose. Within each type, switched...
In eusocial insects the production of daughters is generally restricted to mated queens, and unmated workers are functionally sterile. The evolution this worker sterility has been plausibly explained by kin selection theory [Hamilton W (1964) J Theor Biol 7:1–52], many traits have evolved prevent conflict over reproduction among females in an insect colony. honeybees ( Apis mellifera ), regulated queen, brood pheromones, policing. However, Cape honeybee, capensis , can evade control...
Differentiation into castes and reproductive division of labour are a characteristics eusocial insects. Caste determination occurs at an early stage larval development in social bees is achieved via differential nutrition irrespective the genotype. Workers usually subordinate to queen altruistically refrain from reproduction. Cape honeybee (Apis mellifera capensis) do not necessarily They have unique ability produce female offspring parthenogenetically (thelytoky) can develop 'pseudoqueens'....
Summary Increasing global human populations and climate change not only increase the demand for food but require it to be supplied in sustainable quantities. One crucial aspect sustainability is ensure pollinator services crop production ecosystem services. The distribution of universal bee pollinators different degrees intensity bee‐keeping have resulted a high variability impacts. It therefore essential separate populations, particular cases honeybees bumblebees, into wild/feral managed...
SUMMARY Varroa destructor is considered the most damaging parasite affecting honeybees ( Apis mellifera L.). However, some honeybee populations such as savannah scutellata ) can survive mite infestation without treatment. It unclear if survival due to resistance mechanisms decreasing reproduction or tolerance detrimental effects of mites on host. This study investigates both aspects by quantifying reproductive output V. and its physiological costs at individual host level. Costs measured...