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Browsing by UP Author "Du Rand, Esther Elizabeth"
Now showing items 1-12 of 12
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Weldon, Christopher William; Mnguni, Sandiso; Demares, Fabien J.; Du Rand, Esther Elizabeth; Malod, Kevin; Manrakhan, Aruna; Nicolson, Sue W. (Company of Biologists, 2019-03)Adult holometabolous insects may derive metabolic resources from either larval or adult feeding, but little is known of whether adult diets can compensate for deficiencies in the larval diet in terms of stress resistance. ...
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Du Rand, Esther Elizabeth; Stutzer, Christian; Human, Hannelie; Pirk, Christian Walter Werner; Nicolson, Sue W. (Springer, 2020-02)Nutritional stress due to habitat transformation and loss is one of several factors contributing to current declines in global bee populations. Bees obtain protein from pollen, which in honeybees is consumed and digested ...
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Lerch-Henning, Sara; Du Rand, Esther Elizabeth; Nicolson, Sue W. (Springer, 2017-05)Many dilute nectars consumed by bird pollinators contain secondary metabolites, potentially toxic chemicals produced by plants as defences against herbivores. Consequently, nectar-feeding birds are challenged not only by ...
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Detoxification mechanisms of honey bees (Apis mellifera) resulting in tolerance of dietary nicotine Du Rand, Esther Elizabeth; Smit, Salome; Beukes, Mervyn; Apostolides, Zeno; Pirk, Christian Walter Werner; Nicolson, Sue W. (Nature Publishing Group, 2015-07)Insecticides are thought to be among the major factors contributing to current declines in bee populations. However, detoxification mechanisms in healthy, unstressed honey bees are poorly characterised. Alkaloids are ...
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Du Rand, Esther Elizabeth; Pirk, Christian Walter Werner; Okosun, Olabimpe O.; Yusuf, Abdullahi Ahmed (Taylor and Francis, 2024)The social organization of honey bee colonies is predominantly controlled by the pheromonal cues produced by the queen, workers and brood. Pheromone composition is dependent on the social environment, context, audience and ...
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Langlands, Zoe; Du Rand, Esther Elizabeth; Yusuf, Abdullahi Ahmed; Pirk, Christian Walter Werner (Springer, 2022-01)Hypopharyngeal gland (HPG) development in honey bee workers is primarily age-dependent and changes according to the tasks performed in the colony. HPG activity also depends on colony requirements and is flexible in relation ...
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Du Rand, Esther Elizabeth; Pirk, Christian Walter Werner; Nicolson, Sue W.; Apostolides, Zeno (Elsevier, 2017-04)Honey bees (Apis mellifera) are generalist pollinators that forage for nectar and pollen of a very large variety of plant species, exposing them to a diverse range of secondary metabolites produced as chemical defences ...
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Malod, Kevin; Du Rand, Esther Elizabeth; Archer, C. Ruth; Nicolson, Sue W.; Weldon, Christopher William (Frontiers Media S.A., 2022-02-28)The expression of life-history traits, such as lifespan or reproductive effort, is tightly correlated with the amount and blend of macronutrients that individuals consume. In a range of herbivorous insects, consuming ...
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Langlands, Zoe; Du Rand, Esther Elizabeth; Crailsheim, Karl; Yusuf, Abdullahi Ahmed; Pirk, Christian Walter Werner (Company of Biologists, 2021-01)The honeybee nest parasite Aethina tumida (small hive beetle) uses behavioural mimicry to induce trophallactic feeding from its honeybee hosts. Small hive beetles are able to induce honeybee workers to share the ...
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Du Rand, Esther Elizabeth; Human, Hannelie; Smit, Salome; Beukes, Mervyn; Apostolides, Zeno; Nicolson, Sue W.; Pirk, Christian Walter Werner (Elsevier, 2017-03)Despite potential links between pesticides and bee declines, toxicology information on honey bee larvae (Apis mellifera) is scarce and detoxification mechanisms in this development stage are virtually unknown. Larvae are ...
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Human, Hannelie; Archer, C. Ruth; Du Rand, Esther Elizabeth; Pirk, Christian Walter Werner; Nicolson, Sue W. (Pretoria : University of Pretoria. Faculty of Natural and Agricultural Sciences. Department of Zoology & Entomology, 2014)The effects of pesticides on honeybee larvae are less understood than for adult bees, even though larvae are chronically exposed to pesticide residues that accumulate in comb and food stores in the hive. We investigated ...
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Human, Hannelie; Archer, C. Ruth; Du Rand, Esther Elizabeth; Pirk, Christian Walter Werner; Nicolson, Sue W. (Elsevier, 2014-10)The effects of pesticides on honeybee larvae are less understood than for adult bees, even though larvae are chronically exposed to pesticide residues that accumulate in comb and food stores in the hive. We investigated ...
Now showing items 1-12 of 12