01814nas a2200157   4500008004100000022002500041245009000066210006900156260001600225300001400241490000800255520129500263100002301558700002801581856004701609       2011                        eng d  a0005-7959, 1568-539X00aThe calling songs of male spring field crickets (Gryllus veletis) change as males age0 acalling songs of male spring field crickets Gryllus veletis chan  cJan-01-2011  a1045-10650 v1483 a<p><jats sec=""><jats p="">Sexual traits are typically thought to convey information about a male&#39;s quality or condition. Female preference for older males has been documented in many taxa, but the evidence that males signal their age is inconclusive. We investigated lifetime patterns of acoustic mate attraction signalling in a longitudinal study of the spring field cricket, <jats italic="">Gryllus veletis</jats>. We recorded males continuously throughout their lives, such that every pulse of sound produced by every male was analyzed. Our study answers two main questions: (1) Do calls change as males age? Our results reveal that the calls of male spring field crickets change with age; the calls of older males were quieter, with more silent periods within and between chirps, and produced less often than those of younger males. As males aged most of the changes in call structure reflect decreased calling effort. (2) What is the relationship between calling effort and longevity? Lifetime calling effort was positively related to longevity, such that males that called the most over their life also lived longer than males that called less. Together, our findings provide the most thorough exploration of lifetime signalling patterns in crickets to date.</jats> </jats></p>
1 aBertram, Susan, M.1 aFitzsimmons, Lauren, P.  uhttp://dx.doi.org/10.1163/000579511x58881202583nas a2200277   4500008004100000022001300041245012600054210006900180260001600249300001400265490000700279520171500286653002002001653001902021653002502040653001202065653001302077653001802090653002202108653002102130653002102151653002102172100002302193700002302216856006602239       2011                        eng d  a0003347200aEffects of juvenile and adult condition on long-distance call components in the Jamaican field cricket, Gryllus assimilis0 aEffects of juvenile and adult condition on longdistance call com  cJan-01-2011  a135 - 1440 v813 a<p>Complex signals may arise through either content- or efficacy-based selection. Content-based signals are thought to evolve because of the information content they provide to the receiver. Such signals may function as multiple messages, each relaying different information or types of information. For example, some signals or signal components may indicate different aspects of condition, or condition at different life stages (quality signals), while others relay information on signaller location, or function in species recognition. Or they may act as redundant signals of overall condition, or as backup signals of the same aspect of condition. Efficacy-based signals are proposed to evolve because of the way in which they influence the production, transmission, reception or processing of the signal. We manipulated juvenile and adult condition in male Jamaican field crickets, Gryllus assimilis, to test whether changes in components of the male&rsquo;s long-distance acoustic mate attraction signal were consistent with content- or efficacy-based selection. Several call components exhibited condition-dependence, and may be under content-based selection. Interpulse duration, pulse rate and chirp duration appeared to honestly signal juvenile condition, while dominant frequency appeared to signal adult condition. Thus, these signal components appeared to be acting as multiple messages of quality. Pulse number, interchirp duration and chirp rate were highly stereotyped and probably function in species recognition. Call number increased with decreasing condition and was likely under efficacy-based selection. No call components appeared to have the potential to act as redundant signals.</p>
10aacoustic signal10acomplex signal10acondition-dependence10acontent10aefficacy10aField cricket10amultiple messages10amultiple signals10aredundant signal10asexual selection1 aWhattam, Emily, M.1 aBertram, Susan, M.  uhttp://linkinghub.elsevier.com/retrieve/pii/S0003347210003933