Abstract
Water maintenance is vital for termite survival under dry conditions, hence environment humidity is one of the most important factors that controls the distribution of Isoptera. To understand the dynamics of termite rehydration after water loss, two bioassays were performed with forager workers of Coptotermes gestroi (Wasmann) submitted to water stress. Insects were weighed and placed into Petri dishes without water and food for periods of 3, 15, and 30 h. For each period of water stress, 10 replicates were performed in the treatment and control groups, totalling 120 experimental units. Forager workers lost body mass across all periods of water stress and tested with the highest reduction for the 30 h exposure period. Subsequent access to water resulted in termite rehydration, and final weight values were near to initial body mass values. These results demonstrate that workers of C. gestroi experienced large reductions of body mass under water stress, but these reductions were not severe enough to cause mortality. Additionally, termites were able to rehydrate after water stress conditions. This is a potential risk factor to be considered in cases of new infestations because C. gestroi workers will be able to cause economic damage in their new locations even when deprived of water during their transportation by humans.
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The authors thank to CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for financial support on their termite research.
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Edited by Jorge B Torres – UFRPE
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Janei, V., Lima, J.T. & Costa-Leonardo, A.M. Rehydration After Water Stress in Forager Workers of Coptotermes gestroi (Wasmann) (Blattaria: Rhinotermitidae). Neotrop Entomol 44, 301–307 (2015). https://doi.org/10.1007/s13744-015-0285-6
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DOI: https://doi.org/10.1007/s13744-015-0285-6