Affiliation:
1. Grupo de Ecología de Poblaciones de Insectos, IFAB (CONICET, INTA EEA Bariloche) Bariloche Argentina
2. Departamento de Biodiversidad y Biología Experimental Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Buenos Aires Argentina
3. Departamento de Ecología, Centro Regional Universitario Bariloche Universidad Nacional Del Comahue Bariloche Argentina
Abstract
AbstractWorkers’ task specialization and division of labor are critical features of social insects’ ecological success. It has been proposed that the division of labor relies on response threshold models: individuals varying their sensitivity (and responsiveness) to biologically relevant stimuli and performing a specific task when a stimulus exceeds an internal threshold. In this work, we study carbohydrate and protein responsiveness and their relation to worker task specialization in Vespula germanica, an invasive social wasp. The sucrose and peptone responsiveness of two different subcastes, preforagers and foragers, was determined by stimulating the antenna of the wasps with increasing concentrations of the solution and quantifying whether each concentration elicited a licking response. We studied responsiveness in five different ways: (1) response threshold, (2) concentration 50 (concentration to which at least 50% of wasps responded), (3) maximum response, (4) mean scores and (5) median scores. Our results suggest that V. germanica foragers are more sensitive to sucrose (lower thresholds) than preforager workers. However, we found no differences for peptone thresholds (i.e., a protein resource). Nonetheless, this is the first study to investigate response thresholds for protein resources. The intercaste variation in sucrose responsiveness shown in our work contributes to the existing knowledge about response threshold theory as a mechanism for task specialization observed in V. germanica.
Funder
Fondo para la Investigación Científica y Tecnológica
Consejo Nacional de Investigaciones Científicas y Técnicas
Subject
Insect Science,General Biochemistry, Genetics and Molecular Biology,Agronomy and Crop Science,Ecology, Evolution, Behavior and Systematics
Cited by
1 articles.
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