Yamauchi, K. and Asano, Y. and Lautenschlager, B. and Trindl, A. and Heinze, Juergen (2005) A new type of male dimorphism with ergatoid and short-winged males in Cardiocondyla cf. kagutsuchi. INSECTES SOCIAUX, 52 (3). pp. 274-281. ISSN 0020-1812, 1420-9098
Full text not available from this repository. (Request a copy)Abstract
A new type of ant male dimorphism, consisting of wingless (ergatoid) and short-winged (brachypterous) males, was found in a species of the "Cardiocondyla kagutsuchi"-complex from Malaysia. The ergatoid males show the typical morphological and behavioral characteristics of those of many other Cardiocondyla species. The brachypterous males are morphologically intermediate between ergatoid males and typical winged males of other taxa in this genus. On one hand, they share a number of morphological and behavioral features with ergatoid males that might be adaptations to the loss of flight and intranidal mating: aggressive behavior towards rival males, a prolonged spermatogenesis, which is unique in winged males, paler body coloration, smaller compound eyes, shorter antennal funiculi, more rounded heads - perhaps due to the increased development of mandibular muscles, and an angular pronotum, probably for neck protection. Their short wings appear to protect the petiolar joints during fighting. On the other hand, the brachypterous males have not become as specialized as the ergatoids and to some extent keep the nature of the winged males of other species, i.e., they escape from the nest with a higher probability and with less injuries and do not show a reduction of the ocelli. In the sexual production season, the ergatoid males emerged first in small numbers and then both male morphs emerged in large numbers. The sex ratio was extremely female-biased in the earlier stage of sexual production, probably due to local mate competition.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LOCAL MATE COMPETITION; REPRODUCTIVE STRATEGIES; MALE POLYMORPHISM; MALE ANTS; EVOLUTION; QUEENS; INSECTS; male dimorphism; brachypterous males; ergatoid males; polygyny; alternative reproductive tactics; local mate competition |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie > Zoologie/Evolutionsbiologie (Prof. Dr. Jürgen Heinze) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jun 2021 08:34 |
| Last Modified: | 02 Jun 2021 08:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/36710 |
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