Male mandible trimorphism in the stag beetle Dorcus rectus (Coleoptera: Lucanidae)

Title:

Male mandible trimorphism in the stag beetle Dorcus rectus (Coleoptera: Lucanidae)

Creator:

Iguchi, Yutaka

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:fa42909a-8929-4c42-9622-6a3c95d15eff
uuid:fa42909a-8929-4c42-9622-6a3c95d15eff

Subject:

Zoologie, zoologie, entomologie, Lucanidae, Dorcus rectus, stag beetle, mandible, trimorphism, scaling relationship, discontinuous model, 2, and 59

Type:

article, články, model:article, and TEXT

Description:

Males in many beetles show horn or mandible dimorphism. The stag beetle Dorcus rectus was assumed to have dimorphic males, but in this species there are not two but three visually distinct mandibular phenotypes. The aim of this study is to determine if the three phenotypes represent an allometric trimorphism in this species by studying the scaling relationship between body length and mandible length in 148 adult males and 31 adult females. The relationship was fitted using the following four statistical models; a simple line, a logistic curve, a continuous segmented line and a discontinuous line. The best-fitting model for the males was a discontinuous line with two break points and that for the females a simple line. The male data was also well fitted by a logistic curve. The discontinuous linear model divided the males into three groups that were in good agreement with the three phenotypes. These results suggest that a subtle allometric trimorphism possibly exists in males of this species. Small males of this species have no distinct teeth on their mandibles, whereas small males of D. striatipennis and D. curvidens, which are closely related to D. rectus, have a pair of distinct teeth on their mandibles. The phylogenetic relationship of these Dorcus species suggests that the trimorphism in D. rectus may have arisen through the loss of teeth in small males., Yutaka Iguchi., and Obsahuje seznam literatury

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2013 Volume:110 | Number:1

Harvested from:

CDK

Metadata only:

false