Variation and repeatability of male agonistic hiss characteristics and their relationship to social rank in Gromphadorhina portentosa |
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| Institution: | 1. Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, South Korea;2. Department of Radiology, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, South Korea;1. College of Computer and Information, Hohai University, Nanjing 210098, China;2. Department of Computer Science and Engineering, Huaian College of Information Technology, China;3. School of Business, Nanjing Normal University, Nanjing 210023, China;4. School of Electrical and Information Engineering, University of Sydney, NSW 2006, Australia;5. Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. Dalian University of Technology, No.2 Linggong Road, 116024 Dalian, PR China;2. Dalian Minzu University, No.18 Liaohe West Road, 116600 Dalian, PR China;1. Laboratory of Molecular Genetics, Immunology and Biotechnology, Faculty of Sciences of Tunis, University of Tunis El Manar, Campus universitaire, El Manar 2 2092, Tunisia;2. Laboratory of Molecular Genetics and Vegetal Biotechnology, Faculty of Sciences and Technics of Beni-Mellal, University of Moulay Slimane, Morocco |
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| Abstract: | Male Madagascar hissing cockroaches, Gromphadorhina portentosa, produce a variety of sounds or ‘hisses’ during social interactions. The agonistic signals produced during male-male competition were examined, specifically the intra- and inter-individual variation of agonistic hisses, to determine if these sounds could be reliable indicators of male rank or male size. The relationship between characteristics of the agonistic hiss and social rank were also examined. Among males, agonistic hisses ranged from sounds without clear frequency bands to those with frequency modulation. Agonistic hisses varied in dominant frequency, which was measured at the beginning, middle, and end of the hiss, duration, and hiss rate (number per min). With males, the characteristics of a hiss were repeatable within and between days. Dominant males hissed significantly more than middle-ranking or subordinate males. While dominant, middle-ranking and subordinate males differed in the rate of hissing, there were no significant differences in the duration or dominant frequency of their hisses. Finally, the relationship between male weight and features of agonistic hisses was examined. Both duration and frequency were significantly correlated with male weight. Larger males had longer, lower frequency hisses than smaller males. The possible function of agonistic hissing during male-male interactions and the role of hisses in discrimination between individuals is discussed. |
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