Age Polyethism in Worker Honey Bees
Department of Biology, Hobart and William Smith Colleges, GenevaEthology (Impact Factor: 1.95). 04/2010; 71(3):252 - 255. DOI: 10.1111/j.1439-0310.1986.tb00589.x
- [Show abstract] [Hide abstract]
ABSTRACT: This memo summarizes results obtained from an analysis of seven transient overpower experiments (PNL2-1, PNL2-11, HOP3-3C, C4A, C4B, C4G, C4H) tested in the TREAT facility. The objective of this analysis was to determine the feasibility of predicting cladding failure under transient overpower conditions using the results of a mechanistic fuel rod structural analysis and data from basic cladding material property tests. These results are summarized. A secondary objective was to compare the predictive ability of this mechanistic approach with the predictive ability of more empirical methods. A mechanistic approach to cladding failure prediction is defined as one in which cladding stresses and strains are calculated as functions of time and are compared with basic cladding material property data to predict failure. An empirical approach is defined as one in which basic cladding property data are not used directly to evaluate cladding response or in which cladding loading is not expressed in terms of cladding stress and strain histories.
- Insectes Sociaux - INSECTES SOC. 01/1988; 35(3):262-270.
- [Show abstract] [Hide abstract]
ABSTRACT: A well-regulated division of labor has been one of the core adaptations leading to the success of the social insects. Honeybee division of labor has been classically viewed as a sequence of age-related changes in task performance. Kolmes questioned this view arguing that his studies did not support the existence of any age-related within-nest specialization. To resolve this controversy, Kolmes and Seeley conducted a joint study with mixed results. They found support for a cell cleaning caste, but diverged on whether their results supported distinct nursing and middle age castes. In this paper, I follow up on their work to resolve the question of caste number in within-nest honey bees. To determine whether nurses (typically aged 4–12days) and middle-aged bees (aged 12–20days) have distinct task repertoires, I conducted focal animal observations on a large number of workers in both age groups working within the same nests at the same time. The results support their being two castes of within-nest bees. Young bees specialized on brood care tasks, while middle-aged bees specialized on nectar processing and nest maintenance. Middle-aged bees were observed caring for brood in less than 1% of the observations. Moreover, both castes exhibited movement patterns that correspond to the traditional view that nurses stay within the broodnest, while middle-aged bees move around a great deal in search of work throughout the nest. A review of studies conducted since the debate of Seeley and Kolmes supports the reliability of these results. This work has relevance for proximate models of temporal polyethism, as it is often assumed by such models that there is only one within-nest caste in the honeybee.Behavioral Ecology and Sociobiology 62(5):777-784. · 2.75 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.