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

Wataru Kojima, Chung Ping Lin

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)47-56
Number of pages10
JournalEthology
Volume125
Issue number1
DOIs
Publication statusPublished - 2019 Jan

Fingerprint

male flowers
weapon
beetle
flower
legs
Coleoptera
bamboo
bamboos
Scarabaeidae
body condition
speed
appendages
cost
body size
animal
energy

Keywords

  • compensatory trait
  • flower chafer
  • honest signal
  • resource allocation
  • secondary sexual trait
  • sexual selection

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

Sprint speed is not reduced by exaggerated male weapons in a flower beetle Dicronocephalus wallichii. / Kojima, Wataru; Lin, Chung Ping.

In: Ethology, Vol. 125, No. 1, 01.2019, p. 47-56.

Research output: Contribution to journalArticle

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