Experimental evidence for density-determined wing dimorphism in two bush-crickets (Ensifera: Tettigoniidae)

@article{Poniatowski2009ExperimentalEF,
  title={Experimental evidence for density-determined wing dimorphism in two bush-crickets (Ensifera: Tettigoniidae)},
  author={Dominik Poniatowski and Thomas Fartmann},
  journal={European Journal of Endocrinology},
  year={2009},
  volume={106},
  pages={599-605}
}
Macroptery is common in many species of Orthoptera, but the causes are still discussed. Besides the assumption that macroptery is genetically determined, there is evidence that wing dimorphism is induced by environmental factors, particularly population density. However, most of the research is on pest species. In contrast, knowledge of wing dimorphism in species that occur at low population densites is still poor. Our study aims to test how density actually affects macroptery. As model… 

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References

SHOWING 1-10 OF 42 REFERENCES
RELATIVE EFFECTS OF CLIMATE AND CROWDING ON WING POLYMORPHISM IN THE SOUTHERN GROUND CRICKET, ALLONEMOBIUS SOCIUS (ORTHOPTERA: GRYLLIDAE)
TLDR
Seasonal climate, followed by population density, and then their interaction with each other appear to be the three major determinants of wing morph frequencies in A. socius.
Variability in wing form of crickets
TLDR
The genetic determination of the propensity for macropterism did not seem to be directly coupled to the mechanism performing the photoperiodic time-measurement, and crossing experiments indicated polygenic control of wing form as well asX-chromosomal and maternal effects.
Rapid range expansion of a wing-dimorphic bush-cricket after the 2003 climatic anomaly
TLDR
It is demonstrated that macropters are of high significance for the range expansion of wing-dimorphic insects because a single-year climatic anomaly can induce strong dispersal processes.
Habitat persistence underlies intraspecific variation in the dispersal strategies of planthoppers
TLDR
This study capitalized on existing intraspecific variation in the dispersal capability of Prokelisia planthoppers to examine the relationship between habitat persistence and dispersal, thereby minimizing possible phylogenetic effects and finding a highly significant negative relationship between dispersal capabilities and habitat persistence.
Seasonal wing dimorphism and life cycle of the mole cricket Gryllotalpa orientalis (Orthoptera: Gryllotalpidae)
  • C. Endo
  • Biology, Environmental Science
  • 2006
Control of seasonal wing dimorphism in the oriental mole cricket Gryllotalpa orientalis Brumeister (1839) from a wetland habitat in western Japan is described. The long-winged (LW) morph appeared
Density‐dependent accumulation of phase characteristics in a natural population of the desert locust Schistocerca gregaria
TLDR
Investigation of phase characteristics of locusts from parents that experienced different population densities in Morocco provides more evidence for the dual roles of an individual locust's experience of crowding as well as that of its parents in density‐dependent phase change.
Changes in Dispersal during Species’ Range Expansions
TLDR
The effect of population density on wing morphology differed between populations from the range core (no significant effect of density) and expanding range margins (negative density dependence), which it is proposed is part of the mechanism of the changes in dispersal.
Effects of crowding and photoperiod on wing morph and egg production in Eobiana engelhardti subtropica (Orthoptera: Tettigoniidae)
TLDR
In both the morphs, reproductive traits were to some extent flexible and could be modified by photoperiodic conditions and this suggests that the SW morph is adapted to sedentary life and rapid reproduction and that the LW morph tends to migrate before or during reproduction.
Reduced flight capability in British Virgin Island populations of a wing‐dimorphic insect: the role of habitat isolation, persistence, and structure
1. The effects of habitat isolation, persistence, and host‐plant structure on the incidence of dispersal capability (per cent macroptery) in populations of the delphacid planthopper Toya venilia were
...
...