02057nas a2200157   4500008004100000022001300041245013800054210006900192260001600261300001400277490000700291520149200298100002301790700002101813856006501834       1995                        eng d  a0003347200aVariation and repeatability of male agonistic hiss characteristics and their relationship to social rank in Gromphadorhina portentosa0 aVariation and repeatability of male agonistic hiss characteristi  cJan-01-1995  a719 - 7290 v503 a<p>Male Madagascar hissing cockroaches, Gromphadorhina portentosa, produce a variety of sounds or &lsquo;hisses&rsquo; 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.</p>
1 aClark, Deborah, C.1 aMoore, Allen, J.  uhttp://linkinghub.elsevier.com/retrieve/pii/000334729580132402143nas a2200157   4500008004100000022001400041245014700055210006900202260001600271300001400287490000800301520154700309100002301856700002101879856008501900       1995                        eng d  a0005-795900aSocial Communication in the Madagascar Hissing Cockroach: Features of Male Courtship Hisses and a Comparison of Courtship and Agonistic Hisses0 aSocial Communication in the Madagascar Hissing Cockroach Feature  cJan-01-1995  a401 - 4170 v1323 a<p>Male Madagascar hissing cockroaches (Gromphadorhina portentosa) produce acoustic sounds or &#39;hisses&#39; during courtship interactions with females. G. portentosa males also hiss during agonistic interactions with other males. In this study we documented intra- and inter- individual variation in male courtship hisses, addressed the possible role of hissing as an indicator of male rank, size or mating success, and determined if individual males produce different hisses during courtship and agonistic interactions. We found inter-individual variation in courtship hisses in dominant frequency and duration. Within males, these characteristics of the courtship hiss were repeatable within a day. Characteristics of courtship hisses and mating success were not related to male rank. However, courtship hisses may convey information about the size of the male: larger males had longer, lower frequency hisses than smaller males. There was a trend for males that mated to be larger than males that did not mate. However, characteristics of the&#39; courtship hiss were not significantly related to mating success after controlling for differences in male weight. Finally, we found that the dominant frequency and duration of courtship and agonistic hisses of males did not differ suggesting that males are using similar signals during both courtship and agonistic interactions. We interpret these results in light of the possible functions of hissing, male-male competition, and female discrimination during courtship interactions.</p>
1 aClark, Deborah, C.1 aMoore, Allen, J.  uhttp://booksandjournals.brillonline.com/content/journals/10.1163/156853995x00630