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Browsing Research Articles (Zoology and Entomology) by UP Author "Crewe, Robin M."
Now showing items 1-20 of 39
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Mumoki, F.N. (Fiona); Pirk, Christian Walter Werner; Yusuf, Abdullahi Ahmed; Crewe, Robin M. (Academy of Science of South Africa, 2022-11)SIGNIFICANCE: • The laying workers of the Cape honey bee continue to negatively affect the South African beekeeping industry, with more losses suffered in the northern regions of the country. • The reproductive parasites ...
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ASSAf : putting the ‘Statement on Ethical Research and Scholarly Publishing Practices’ into practice Veldsman, Susan; Gevers, Wieland; Crewe, Robin M. (Academy of Science of South Africa, 2019-11)Following a Workshop on the Ethics of Scholarly Publishing on 11 April 2018, and with the collective goal of advancing research integrity in South Africa, the Academy of Science of South Africa (ASSAf), the Council for ...
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Crewe, Robin M. (Academy of Science of South Africa, 2020-09)No abstract available.
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Mumoki, F.N. (Fiona); Yusuf, Abdullahi Ahmed; Pirk, Christian Walter Werner; Crewe, Robin M. (Oxford University Press, 2021-03)Cohesion in social insect colonies is maintained by use of chemical signals produced by the queen, workers, and brood. In honey bees in particular, signals from the queen and brood are crucial for the regulation of ...
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Requier, Fabrice; Garnery, Lionel; Kohl, Patrick Laurenz; Njovu, Henry K.; Pirk, Christian Walter Werner; Crewe, Robin M.; Steffan-Dewenter, Ingolf (Elsevier, 2019-09)Recent studies have emphasized the role of the western honey bee, Apis mellifera, as a managed agricultural species worldwide, but also as a potential threat to endangered wild pollinators. This has resulted in the suggestion ...
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Jarosch-Perlow, Antje; Yusuf, Abdullahi Ahmed; Pirk, Christian Walter Werner; Crewe, Robin M.; Moritz, Robin F.A. (Springer, 2018-08)The honeybee queen’s mandibular gland pheromones (QMP) are essential for the suppression of worker reproduction. Worker ovary activation is regulated by alternative splicing of a CP2-transcription factor named gemini. Since ...
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Lattorff, H. Michael G.; Moritz, Robin F.A.; Crewe, Robin M.; Solignac, M. (Royal Society, 2007-06-07)Differentiation into castes and reproductive division of labour are a characteristics of eusocial insects. Caste determination occurs at an early stage of larval development in social bees and is achieved via differential ...
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Altaye, Solomon Z.; Pirk, Christian Walter Werner; Crewe, Robin M.; Nicolson, Sue W. (Company of Biologists, 2010-06)The nutritional needs of bees are supplied by nectar carbohydrates and by protein and other nutrients in pollen but little is known of how bees achieve nutritional balance. Using newly emerged caged worker honeybees (Apis ...
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Yusuf, Abdullahi Ahmed; Crewe, Robin M.; Pirk, Christian Walter Werner (Entomological Society of Southern Africa, 2013-09-13)Pachycondyla analis Latreille (Hymenoptera: Formicidae) is a common African Ponerine ant that organizes group raids on termites considered a huge burden to agriculture. This ant has been the subject of various entomological ...
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Okosun, Olabimpe O.; Yusuf, Abdullahi Ahmed; Crewe, Robin M.; Pirk, Christian Walter Werner (Springer, 2015-10)Secretions from tergal glands are part of a queen’s pheromonal control of worker reproduction in honey bees. However, in queenless honey bee colonies, workers compete to gain pheromonal, and hence reproductive dominance, ...
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Crewe, Robin M. (AOSIS OpenJournals, 2016-03)The history of scholarly journal publishing is generally dated from the appearance of the Philosophical Transactions of the Royal Society of London in 1665.1 The notable features of this publication are that it is the ...
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Jaffe, Rodolfo; Dietemann, Vincent; Allsopp, Mike Herbert; Costa, Cecilia; Crewe, Robin M.; Raffaele, Dall'olio; Pilar, De la Rua; El-Niweiri, Mogbel A. A.; Fries, Ingemar; Kezic, Nikola; Meusel, Michael S.; Paxton, Robert J.; Shaibi, Taher; Stolle, Eckart; Moritz, Robin F.A. (Wiley Blackwell, 2010-04)Although pollinator declines are a global biodiversity threat, the demography of the western honeybee (Apis mellifera) has not been considered by conservationists because it is biased by the activity of beekeepers. To ...
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Crewe, Robin M. (AOSIS Open Journals, 2016-09)Scholarly academies have been in existence for about 350 years, with the oldest being those that were established in Europe in the 17th century. These institutions consist of groups of individuals who are elected by their ...
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Crewe, Robin M.; Strauss, Ursula; Human, Hannelie; Pirk, Christian Walter Werner; Crewe, Robin M. (Entomological Society of Southern Africa, 2010)No abstract available.
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Okosun, Olabimpe O.; Pirk, Christian Walter Werner; Crewe, Robin M.; Yusuf, Abdullahi Ahmed (Elsevier, 2017-10)Pheromonal control by the honey bee queen is achieved through the use of secretions from diverse glandular sources, but the use of pheromones from a variety of glandular sources by reproductively dominant workers, has not ...
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Neumann, Peter; Naef, Jan; Crailsheim, Karl; Crewe, Robin M.; Pirk, Christian Walter Werner (Wiley, 2015-12)Some parasites of social insects are able to exploit the exchange of food between nestmates via trophallaxis, because they are chemically disguised as nestmates. However, a few parasites succeed in trophallactic solicitation ...
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Human, Hannelie; Pirk, Christian Walter Werner; Crewe, Robin M.; Dietemann, Vincent (Entomological Society of Southern Africa, 2011)Sustaining apiculture worldwide has been threatened by bee diseases and unexplained colony losses. African honeybee populations seem healthier and no major losses have been reported despite the presence of all the major ...
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Mumoki, F.N. (Fiona); Yusuf, Abdullahi Ahmed; Pirk, Christian Walter Werner; Crewe, Robin M. (Elsevier, 2019-11)Colony losses due to social parasitism in the form of reproductive workers of the Apis mellifera capensis clones results from the production of queen-like pheromonal signals coupled with ovarian activation in these socially ...
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Ellis, Michael Battiscombe; Nicolson, Sue W.; Crewe, Robin M.; Dietemann, Vincent (Elsevier, 2008-08)Terrestrial organisms need to limit evaporation from their bodies in order to maintain a homeostatic water balance. Owing to a large surface to volume ratio, rthropods are particularly susceptible to desiccation and ...
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Strauss, Ursula; Pirk, Christian Walter Werner; Crewe, Robin M.; Human, Hannelie; Dietemann, Vincent (Springer, 2015-01)The devastating effects of Varroa destructor on European honeybee colonies (Apis mellifera L.) have been well documented. Not only do these mites cause physical damage to parasitised individuals when they feed on them, ...
Now showing items 1-20 of 39