Sprint speed is not reduced by exaggerated male weapons in a flower beetle Dicronocephalus wallichii

Wataru Kojima, Chung Ping Lin

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Exaggerated sexually selected traits are assumed to decrease the mobility of bearers. However, previous empirical studies have often failed to support this assumption, possibly because locomotor performance represents the integration of numerous morphological, physiological and behavioural traits. Males of a flower beetle Dicronocephalus wallichii Pouillaude 1914 (Coleoptera: Scarabaeidae: Cetoniinae) possess elongated forelegs and a pair of exaggerated horns, which are used as dual weapons in male–male competition for mates. We investigated whether these two sexual traits impede the maximum sprint speed on bamboo branches with different angles and thicknesses under laboratory conditions. Our results suggested that no negative relationship exists between relative foreleg length or horn length and sprint speed. Elongated forelegs and horns may entail negligible locomotor costs. Males with longer horns and forelegs were found to have longer midlegs and hindlegs independent of body size. Thus, elongated midlegs and hindlegs in males may enhance balance, stabilize running on bamboo branches and compensate for the locomotor costs of bearing exaggerated weapons. Furthermore, a positive relationship was found between horn length and sprint speed on a horizontal branch. Males with longer horns probably have more energy and/or invest more heavily in appendage musculature. As is known in other animals, male horns of D. wallichii may act as honest indicators of body condition.

原文英語
頁(從 - 到)47-56
頁數10
期刊Ethology
125
發行號1
DOIs
出版狀態已發佈 - 2019 一月

ASJC Scopus subject areas

  • 生態學、進化論、行為學與系統學
  • 動物科學與動物學

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