Visual and acoustical social displays by the grasshopper Chortophaga viridifasciata (Acrididae: Oedipodinae)
| Autor: | June B. Steinberg, Robert B. Willey |
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| Rok vydání: | 1974 |
| Předmět: | |
| Zdroj: | Canadian Journal of Zoology. 52:1145-1154 |
| ISSN: | 1480-3283 0008-4301 |
| DOI: | 10.1139/z74-153 |
| Popis: | Univoltine northern populations of Chortophaga viridifasciata (De Geer) are usually separated seasonally and by habitat preference from other acridids, whereas southern populations usually are bi- or tn-voltine. potentially interacting with many acridid species seriatim. This series of populations affords an opportunity to lest quantitatively the effects of interspecific interaction on the communication system. Field and laboratory analyses of a population from northern Illinois clarify several aspects of the communication system. As a member of the Oedipodinae, Chortophaga possesses several primitive-appearing morphological characteristics associated with signalling, for example, a variable stridulatory apparatus present only in the male, relatively uncolored and unhanded hindwings, and a lack of contrasting colors or markings associated with the metathoracic legs which are used as a semaphore signalling device. In addition, behavioral analyses reveal signals (e.g., the fast flick) intermediate between those used for agonistic and courtship behavior, and provide evidence which may support extant hypotheses regarding the origin of communication systems in the Oedipodinae. It remains uncertain, however, whether these features are truly primitive or the result of relaxed selection pressure for maintenance of a more precise communication system |
| Databáze: | OpenAIRE |
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