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Browsing by UP Author "Nicolson, Sue W."
Now showing items 1-20 of 74
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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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Antioxidant supplementation can reduce the survival costs of excess amino acid intake in honeybees Archer, C. Ruth; Kohler, Angela; Pirk, Christian Walter Werner; Oosthuizen, Vinette; Apostolides, Zeno; Nicolson, Sue W. (Elsevier, 2014-12)Over-consuming amino acids is associated with reduced survival in many species, including honeybees. The mechanisms responsible for this are unclear but one possibility is that excessive intake of amino acids increases ...
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Symes, Craig Thomas; Human, Hannelie; Nicolson, Sue W. (Elsevier, 2009)Aloe marlothii and A. greatheadii var. davyana are two sympatric winter-flowering succulents that occur in the summer rainfall regions of northern and north-eastern South Africa. Both have flower characteristics that are ...
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Nicolson, Sue W. (Zoological Society of Southern Africa, 2011-10)Bees are herbivorous insects, consuming nectar and pollen throughout their life cycles. This paper is a brief review of the chemistry of these two floral resources and the implications for bee nutrition. Nectar is primarily ...
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Nicolson, Sue W.; Human, Hannelie (The Royal Society, 2008-06)Nectar concentration is assumed to remain constant during transport by honeybees between flowers and hive. We sampled crop contents of nectar foragers on Aloe greatheadii var. davyana, a major winter bee plant in South ...
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Holtzhausen, W.D. (Wendy Dianne); Nicolson, Sue W. (Elsevier, 2007-04)This paper reports the effects of different diuretic factors on the Malpighian tubules of beetles. Calcitonin (CT)-like peptides from silkmoth and mosquito increase fluid secretion in a dose-dependent manner in the tubules ...
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Lerch-Henning, Sara; Nicolson, Sue W. (Blackwell, 2013-07)Although the function of nectar is to attract and reward pollinators, secondary metabolites produced by plants as anti-herbivore defences are frequently present in floral nectars. Greater understanding is needed of the ...
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Nicolson, Sue W.; Human, Hannelie (Springer, 2013-03)The nutritional needs of bees are receiving renewed attention in the context of declining bee populations and changes in land use that threaten floral resources. We present a comprehensive analysis of the nutritional ...
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Minnaar, I.A. (Ingrid Ane); Kohler, Angela; Purchase, Cromwell; Nicolson, Sue W. (Wiley-Blackwell, 2013-05)Coloured nectar is a rare phenomenon best known from islands and insular habitats. Islands are also known for lizard pollination, where coloured nectar potentially acts as a visual cue to attract pollinators, advertising ...
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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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Carvalheiro, Luísa G.; Seymour, Colleen L.; Nicolson, Sue W.; Veldtman, Ruan (Wiley-Blackwell, 2012-12)1. As cropland increases, fields become progressively isolated from pollinators, leading to declines in pollinator-dependent crop productivity. With the rise in demand for pollinatordependent foods, such productivity ...
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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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Nicolson, Sue W.; Das Neves, Susana Da Silva; Human, Hannelie; Pirk, Christian Walter Werner (Elsevier, 2018-05)Pollen, the main protein source for honey bees, is mixed with regurgitated nectar or honey during collection and then stored as ‘bee bread’ before its consumption, mainly by young nurse workers. It has been suggested that ...
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Bailey, Ida E.; Nicolson, Sue W. (Wiley, 2016-03)Nectarivorous birds typically consume smaller meals of more concentrated than of less concentrated sugar solutions. It is not clear, however, whether they use taste to decide how much to consume or whether they base this ...
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Shi, Lianhui; Nicolson, Sue W.; Yang, Yunqiang; Wu, Jianing; Yan, Shaoze; Wu, Zhigang (Company of Biologists, 2020)Optimal concentrations for nectar drinking are limited by the steep increase in the viscosity of sugar solutions with concentration. However, nectar viscosity is inversely related to temperature, which suggests advantages ...
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Nicolson, Sue W.; Fleming, Patricia A. (Company of Biologists, 2014)Regulation of energy and water are by necessity closely linked in avian nectarivores, because the easily available sugars in nectar are accompanied by an excess of water but few electrolytes. In general, there is convergence ...
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Nicolson, Sue W.; Fleming, Patricia A. (Company of Biologists, 2013)Regulation of energy and water are by necessity closely linked in avian nectarivores, because the easily available sugars in nectar are accompanied by an excess of water but few electrolytes. In general, there is ...
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Archer, C. Ruth; Pirk, Christian Walter Werner; Carvalheiro, Luísa G.; Nicolson, Sue W. (Wiley- Blackwell, 2014-04)Understanding the causes and consequences of pollinator declines is a priority in ecological research. However, across much of the globe we have a poor understanding of pollinator assemblages, population trends and the ...
Now showing items 1-20 of 74