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  • Shelia M. Fitzpatrick (a1) and William G. Wellington (a1)

Among territorial syrphids, males of Eumerus tuberculatus (Rond.) are less aggressive than Merodon equestris (Fab.) and Eristalis tenax (L.) males. This difference in aggressiveness persists even when territorial pressures increase with increasing numbers of conspecifics.

Males of each species recognized conspecific females mainly by a combination of visual and behavioural cues. A territorial male might approach any intruder, but would only attempt to mate if, like the appropriate female, the intruder did not respond to the male's approach. Differences in behavioural patterns may be due to different mating strategies.


Chez les syrphidés territoriaux, les mâles d'Eumerus tuberculatus (Rond.) sont moins agressifs que les mâles de l'espèce Merodon equestris (Fab.) ainsi que ceux d'Eristalis tenax (L.). Même lorsque les pressions territoriales augmentent avec une augmentation du nombre des individuels, cette différence d'aggressivité continue.

Les mâles reconnaissent les femelles de leur espèce par des indices visuels et par le comportement de ces femelles. Un mâle territorial peut s'approcher de tout intrus, mais ne tentera de s'accoupler que si l'intrus demeure indifférent à ses avances, comme le ferait une femelle de l'espèce convenable. Les différences au niveau du comportement peuvent être causées par des stratégies d'accouplement distinctes.

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Alcock J. 1979. Multiple mating in Calopteryx maculata (Odonata: Calopterygidae) and the advantage of non-contact guarding by males. J. Nat. Hist. 13: 439446.
Alcock J., Barrows E. M., Gordh G., Hubbard L. J., Kirkendall L., Pyle D. W., Ponder T. L., and Zalom F. G.. 1978. The ecology and evolution of male reproductive behaviour in the bees and wasps. J. Linn. Soc. London (Zool.) 64: 293326.
Biggs J. D. 1972. Aggressive behavior in the adult apple maggot (Diptera: Tephritidae). Can. Ent. 104: 349353.
Boorman E. and Parker G. A.. 1976. Sperm (ejaculate) competition in Drosophila melanogaster, and the reproductive value of females to males in relation to female age and mating status. Ecol. Ent. 1: 145155.
Brown J. L. and Orians G. H.. 1970. Spacing patterns in mobile animals. A. Rev. Ecol. Syst. 1: 239262.
Davies N. B. 1978. Ecological questions about territorial behaviour. pp. 317350in Krebs J. R. and Davies N. B. (Eds.), Behavioural Ecology: An Evolutionary Approach. Blackwell Scientific, Oxford.
Eickwort G. C. And Ginsberg H. S.. 1980. Foraging and mating behavior in Apoidea. A. Rev. Ent. 25: 421446.
Fitzpatrick S. M. 1981. Territorial aggression among males of three syrphid species. M.Sc. Thesis, University of British Columbia.
Heal J. 1979. Colour patterns of Syrphidae: I. Genetic variation in the dronefly Eristalis tenax. Heredity 42: 223236.
Maier C. T. and Waldbauer G. P.. 1979. Dual mate-seeking strategies in male syrphid flies (Diptera: Syrphidae). Ann. ent. Soc. Am. 72: 5461.
Noble G. K. 1939. Symposium on the individual vs. the species. IV. The role of dominance in the social life of birds. Auk 56: 263273.
Parker G. A. 1970. Sperm competition and its evolutionary consequences in insects. Biol. Rev. 45: 525567.
Severinghaus L. L., Kurtak B. H., and Eickwort G. C.. 1981. The reproductive behavior of Anthidium manicatum (Hymenoptera: Megachilidae) and the significance of size for territorial males. Behav. Ecol. Sociobiol. 9: 5158.
Wellington W. G. and Fitzpatrick S. M.. 1981. Territoriality in the drone fly, Eristalis tenax (L.) (Diptera: Syrphidae). Can. Ent. 113: 695704.
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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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