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Sexually dimorphic male horns and their use in agonistic behaviors in the horn-headed cricket Loxoblemmus doenitzi (Orthoptera: Gryllidae)

Title
Sexually dimorphic male horns and their use in agonistic behaviors in the horn-headed cricket Loxoblemmus doenitzi (Orthoptera: Gryllidae)
Authors
Kim H.Jang Y.Choe J.C.
Ewha Authors
최재천장이권
SCOPUS Author ID
최재천scopus; 장이권scopus
Issue Date
2011
Journal Title
Journal of Ethology
ISSN
0289-0771JCR Link
Citation
vol. 29, no. 3, pp. 435 - 441
Indexed
SCIE; SCOPUS WOS scopus
Abstract
Sexual dimorphism, the difference between the sexes in secondary sexual characters, is in general driven by processes of sexual selection. The horn-headed cricket, Loxoblemmus doenitzi, exhibits sexual dimorphism in head shape. Males have flat heads and triangular horns on both sides of their heads, whereas females have rounded heads and no horns. We hypothesized that male horns have evolved due to intra-sexual selection, in which males use these horns as weapons in aggressive interactions. We tested two predictions of this hypothesis by conducting agonistic trials with field-caught males of L. doenitzi: (1) the horns should be used in agonistic interactions between males, and (2) the asymmetry in horn size or horn use may determine contest outcome. Horn length was significantly correlated with thorax length and hind femur length. During agonistic interactions, males aggressively used their horns by beating the opponent's horns with their own or by poking the opponent's body. However, logistic regression analysis revealed that neither horn length nor horn use were significant factors for contest outcome. Instead, body size was significant for determining contest outcome. We discuss possible scenarios for evolution of male horns in L. doenitzi. © 2011 Japan Ethological Society and Springer.
DOI
10.1007/s10164-011-0277-x
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
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