Competitive males but not attractive males reduce female fitness in Gnatocerus cornutus

Kiyose, Katsuya; Katsuki, Masako; Suzaki, Yû; Okada, K.

doi:10.1016/j.anbehav.2015.09.002

Cited by 11 publications

(16 citation statements)

References 90 publications

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“…Then, competition may induce changes in chemical cue composition that alter the way winners and losers are perceived by females. Females may benefit from selecting males that maximizing fecundity and offspring viability (Byers & Waits, 2006;Kiyose et al, 2015;Milinski & Bakker, 1990;Moore et al, 2003). Behavioral dominance is often associated with high immunocompetence and production of offspring with "good genes" (Hill, 1991;Hill & Montgomerie, 1994;López et al, 2002;Penn & Potts, 1998).…”

Section: Discussionmentioning

confidence: 99%

Male competition reverses female preference for male chemical cues

Vilella‐Pacheco

Mitchem

Formica

et al. 2021

Ecology and Evolution

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Section: Discussionmentioning

confidence: 99%

Male competition reverses female preference for male chemical cues

Vilella‐Pacheco

Mitchem

Formica

et al. 2021

Ecology and Evolution

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“…Many studies have now demonstrated that highly competitive males can be harmful to females (e.g. [62 -66]) and in G. cornutus, indicate female mate-preference may be constrained, because although females prefer males that fight less, they frequently do not get to mate with them [33,60].…”

Section: Discussionmentioning

confidence: 99%

Loser-effect duration evolves independently of fighting ability

Okada

Dall

et al. 2019

Proc. R. Soc. B.

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Winning or losing contests can impact subsequent competitive behaviour and the duration of these effects can be prolonged. While it is clear effects depend on social and developmental environments, the extent to which they are heritable, and hence evolvable, is less clear and remains untested. Furthermore, theory predicts that winner and loser effects should evolve independently of actual fighting ability, but again tests of this prediction are limited. Here we used artificial selection on replicated beetle populations to show that the duration of loser effects can evolve, with a realized heritability of about 17%. We also find that naive fighting ability does not co-evolve with reductions in the duration of the loser effect. We discuss the implications of these findings and how they corroborate theoretical predictions.

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“…In G. cornutus, the mandibular horns are costly in terms of decreased pupal survival [41] and a reduction of wing and elytra size [42]. Nevertheless, the females determine whether copulation occurs [29] and, likely because daughters sired by large males have a lower fitness (because of their suboptimal body shape) and because of harassment by the superior males [43], males with large horns are not preferred by females [29]. It is questionable how counteractive female choice is to horn size in G. cornutus , but it is possible that the horns are not at absolute limit of production.…”

Section: Discussionmentioning

confidence: 99%

First Case of Dual Size Asymmetry in an Identical Arthropod Organ: Different Asymmetries of the Combative (Sexual) and Cutting (Non-Sexual) Parts of Mandibles in the Horned Stored-Product Beetle Gnatocerus cornutus (Fabricius, 1798)

Vendl

Stejskal

Aulický

2018

Insects

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Although it is known that separate insect body structures may be asymmetrical within one species, the different functional asymmetries within a single organ as a result of differential selective regimes have not been described. Based on microscopic measurements and SEM photography, we examined the size, shape and asymmetry of the mandibular structures of males and females of the sexually dimorphic broad-horned flour beetle, Gnatocerus cornutus (Tenebrionidae, Coleoptera). It was found that sexual dimorphism only manifests in certain outgrowth parts (horns) of male mandibles, while the remaining cutting parts of the mandibles hold identical morphologies for both sexes. A more interesting finding—since this is the first published case of dual functionally selected asymmetry in an identical arthropod organ—was that the cutting part of the male mandible exhibited directional asymmetry, whereas the outgrowth horn part of the mandible showed a high degree of symmetry. Moreover, there was no relationship between the size and asymmetry of horns. The results indicate different regulatory mechanisms of sexually selected combative horns and the food-functional, more conservative (constrained by hard food and adult long life) cutting parts of mandibles.

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Competitive males but not attractive males reduce female fitness in Gnatocerus cornutus

Cited by 11 publications

References 90 publications

Male competition reverses female preference for male chemical cues

Male competition reverses female preference for male chemical cues

Loser-effect duration evolves independently of fighting ability

First Case of Dual Size Asymmetry in an Identical Arthropod Organ: Different Asymmetries of the Combative (Sexual) and Cutting (Non-Sexual) Parts of Mandibles in the Horned Stored-Product Beetle Gnatocerus cornutus (Fabricius, 1798)

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