ORCID Profile
0000-0003-3725-6133
Current Organisations
Technological University Dublin
,
Stellenbosch University
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Publisher: The Royal Society
Date: 28-11-2008
Abstract: The Cape bee ( Apis mellifera capensis ) is unique among honeybees in that workers can lay eggs that instead of developing into males develop into females via thelytokous parthenogenesis. We show that this ability allows workers to compete directly with the queen over the production of new queens. Genetic analyses using microsatellites revealed that 23 out of 39 new queens produced by seven colonies were offspring of workers and not the resident queen. Of these, eight were laid by resident workers, but the majority were offspring of parasitic workers from other colonies. The parasites were derived from several clonal lineages that entered the colonies and successfully targeted queen cells for parasitism. Hence, these parasitic workers had the potential to become genetically reincarnated as queens. Of the daughter queens laid by the resident queen, three were produced asexually, suggesting that queens can ‘choose’ to produce daughter queens clonally and thus have the potential for genetic immortality.
Publisher: Springer Science and Business Media LLC
Date: 02-2005
Publisher: Oxford University Press (OUP)
Date: 22-03-2014
Publisher: Springer Science and Business Media LLC
Date: 2002
DOI: 10.1038/415163A
Publisher: Oxford University Press (OUP)
Date: 28-02-2008
Abstract: When workers of the thelytokous Cape honeybee, Apis mellifera capensis, come into contact with colonies of the neighboring arrhenotokous subspecies Apis mellifera scutellata, they can become lethal social parasites. We examined the inheritance of 3 traits (number of ovarioles, number of basitarsal hairs, and size of spermatheca) that are thought to be associated with reproductive potential in A. m. capensis workers. To do so, we produced hybrid A. m. scutellata/A. m. capensis queens and backcrossed them to either A. m. capensis or A. m. scutellata drones. We then measured the 3 traits in parental, hybrid, and backcross offspring. We show that the 3 traits are phenotypically correlated. We also show that the expression of ovariole number, basitarsal hairs, and size of spermatheca is influenced by the genotype of the in idual and the rearing environment but that the influence of the rearing environment is less important to the number of ovarioles. We hypothesize a single recessive allele (l), present at high frequency in natural A. m. capensis populations, which when homozygous causes larvae to elicit more food. This increased feeding as larvae causes resulting adult workers to develop more queen-like morphology and increased reproductive potential. The number of ovarioles, in contrast, appears to be under independent genetic control.
Publisher: Springer Science and Business Media LLC
Date: 08-2002
Publisher: Springer Science and Business Media LLC
Date: 12-09-2008
Abstract: Hybrid zones are found wherever two populations distinguishable on the basis of heritable characters overlap spatially and temporally and hybridization occurs. If hybrids have lower fitness than the parental types a tension zone may emerge, in which there is a barrier to gene flow between the two parental populations. Here we discuss a hybrid zone between two honeybee subspecies, Apis mellifera capensis and A. m. scutellata and argue that this zone is an ex le of a tension zone. This tension zone is particularly interesting because A. m. capensis can be a lethal social parasite of A. m. scutellata. However, despite its parasitic potential, A. m. capensis appears to be unable to increase its natural range unassisted. We propose three interlinked mechanisms that could maintain the South African honeybee hybrid zone: (1) low fitness of intercrossed and genetically mixed colonies arising from inadequate regulation of worker reproduction (2) higher reproductive success of A. m. scutellata via both high dispersal rates into the hybrid zone and increased competitiveness of males, countered by (3) the parasitic nature of A. m. capensis.
Publisher: Springer Science and Business Media LLC
Date: 05-05-2017
Publisher: Informa UK Limited
Date: 10-03-2023
Publisher: Emerald
Date: 14-10-2019
DOI: 10.1108/IJCHM-10-2018-0849
Abstract: To identify, develop and retain talent, an important first step is to ensure that key stakeholders in the talent management (TM) process have a shared view of what is meant by talent within the organisation. The purpose of this paper is to conceptualise how talent is defined in the context of the hospitality industry and to examine the degree of (mis)alignment among corporate and business unit leaders. The paper uses a qualitative approach consisting of 73 interviews with stakeholders at corporate and business unit levels in three multinational hotel corporations. In addition, documents were collected and analysed to support the interview data. Each organisation had a formal approach to conceptualising talent at a corporate level. Both inclusive and exclusive views on talent as well as a broad set of characteristics that make up talent were reported with the importance of organisational values being prominent. However, despite formal global policies being in place, considerable ergence in practice was found across organisational levels. A lack of clarity on what talent means in an organisational setting may lead to an inconsistent talent identification process which may lead to negative perceptions of fairness among employees. This may, in turn, bring about disgruntled employees and increased turnover. This paper provides empirical evidence to the limited body of knowledge on the conceptualisation of talent. The display of organisational values emerged as important to being labelled talent, a factor that has received scant consideration in the literature.
Publisher: Informa UK Limited
Date: 10-11-2021
No related grants have been discovered for Theresa Wossler.