Abstract
Two parasitoid flies,Physocephala rufipes andSicus ferrugineus (Diptera, Conopidae), and their hosts,Bombus spp., coexist at various locations in northwestern Switzerland. A detailed field study showed that both conopid species use the hostB. pascuorum to a similar degree, while the hostB. terr-luc (a pooled category ofB. terrestris andB. lucorum) is more frequently parasitised than expected byS. ferrugineus. The hostB. lapidarius in turn is exclusively used byP. rufipes. Furthermore, hosts ofB. terr-luc andB. pascuorum parasitised byS. ferrugineus were larger than hosts parasitised byP. rufipes, or than those not parasitised. The findings suggest thatS. ferrugineus selects larger hosts and may displaceP. rufipes. Pupal weight, a predictor of adult body size and parasitoid fecundity, is positively correlated with host size and larger pupae are more likely to emerge, while host species had no effect on the probability of emergence in either conopid species. Host species affected pupal weight inS. ferrugineus, but not inP. rufipes, althoughP. rufipes grew larger in hosts of a given size. Daughters emerged from larger pupae than males, but this did not correlate with larger host sizes. These observations add to the scarce knowledge of dipteran parasitoids.
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References
Allen AA (1969) Abundance ofConops ceriaeformis Mg. in SE London. Entomol Monthly Mag 105: 181
Alphen JJM van, Vet LEM (1986) An evolutionary approach to host finding and selection. In: Waage J, Greathead D (eds) Insect parasitoids. Academic Press, New York, pp 23–61
Assem J van den, Iersel JJA van, Los-den Hartogh RL (1989) Is being large more important for female than for male parasitic wasps. Behaviour 108: 160–195
Chacko MJ (1969) The phenomenon of superparasitism inTrichogramma evanescens minutum Riley (Hymenoptera: Trichogrammatidae). Beitr Entomol 16: 617–635
Clausen CP (1940) Entomophagous insects. McGraw-Hill, New York
De Meijere JCH (1903) Beiträge zur Kenntnis der Biologie und der systematischen Verwandtschaft der Conopiden. Tijdsch Entomol 46: 144–225
De Meijere JCH (1912) Neue Beiträge zur Kenntnis der Conopiden. Tijdsch Entomol 55: 184–207
Embree DG, Sisojevic P (1965) The bionomics and population density ofCyzenis albicans (Fall.) (Tachinidae: Diptera) in Nova Scotia. Can Entomol 97: 631–639
Freeman BA (1966) Notes on conopid flies including insect hostplant and phoretic relationships (Diptera: Conopidae). J Kans Entomol Soc 39: 123–131
Godfray HCJ (1994) Parasitoids. Behavioral and evolutionary ecology. Princeton University Press, Princeton, New Jersey
Müller CB, Schmid-Hempel P (1992a) Correlates of reproductive success among field colonies ofBombus lucorum L.: the importance of growth and parasites. Ecol Entomol 17: 343–353
Müller CB, Schmid-Hempel P (1992b) Variation in life history pattern in relation to worker mortality in the bumblebee,Bombus lucorum. Funct Ecol 6: 48–56
Müller CB, Schmid-Hempel P (1993) When fever does not pay: exploitation of cold temperatures as defense against parasitoids in bumblebees. Nature 363: 65–67
Pak GA, Oatman ER (1982) Biology ofTrichogramma brevicopillum. Entomol Exp Appl 32: 61–67
Pouvreau A (1974) Les enemies des bourdons. II. Organismes affectant les adultes. Apidologie 5: 39–62
Salt G (1940) Experimental studies in insect parasitism. VII. The effect of different hosts on the parasiteTrichogramma evanescens Westwood. Proc R Soc Lond A 15: 81–95
Schmid-Hempel P, Durrer S (1991) Parasites, floral resources and reproduction in natural populations of bumblebees. Oikos 62: 342–350
Schmid-Hempel P, Schmid-Hempel R (1988) Parasitic flies (Conopidae, Diptera) may be important stress factors for the ergonomics of their bumblebee hosts. Ecol Entomol 13: 469–472
Schmid-Hempel P, Schmid-Hempel R (1990) Endoparasitic larvae of conopid flies alter pollination behaviour of bumblebees. Naturwissenschaften 27: 50–52
Schmid-Hempel P, Müller C, Schmid-Hempel R, Shykoff JA (1990) Frequency and ecological correlates of parasitisation by conopid flies (Conopidae, Diptera). Insectes Soc 37: 14–30
Schmid-Hempel R (1994) Evolutionary ecology of a host-parasitoid interaction. PhD Dissertation, Basel University
Schmid-Hempel R, Müller CJ (1991) Do foraging bumblebees work for their colony? Anim Behav 41: 910–912
Schmid-Hempel R, Schmid-Hempel P (1989) Superparasitism and larval competition in conopid flies (Dipt., Conopidae), parasitising bumblebees (Hym, Apidae). Mitt Schweizer Entomol Ges 62: 279–289
Schmid-Hempel R, Schmid-Hempel P (1991) Endoparasitic flies, pollen-collection by bumblebees and a potential host-parasite conflict. Oecologia 87: 227–232
Schmid-Hempel R, Schmid-Hempel P (1996) Larval development of two parasitic flies (Conopidae) in the common hostBombus pascuorum. Ecol Entomol 21: 63–70
Smith HS, Pimentel D (1969) The effect of two host species on the longevity and fertility ofNasonia vitripennis. Ann Entomol Soc Am 62: 305–308
Smith KGV (1966) The larva ofThecophora occidensis, with comments upon the biology of Conopidae (Diptera). J Zool 149: 263–244
Smith KGV (1969) Diptera: Conopidae. Handbooks for the identification of British insects 10: 1–18
Smith KGV, Peterson BV (1987) Conopidae. In: JF McAlpine (ed) Manual of Nearctic Diptera, vol 2. Biosystematic Research Centre, Research Branch Agriculture Canada, Ottawa, Ontario
Veen JC van (1981) The biology ofPoecilostictus cothurnatus (Hymenoptera, Ichneumonidae) and endoparasite ofBupalus piniarius (Lepidoptera, Geometridae). Ann Entomol 47: 77–93
Waage JK, Ming NS (1984) The reproductive strategy of a parasitic wasp. I. Optimal progeny and sex allocation inTrichogramma evanescens. J Anim Ecol 53: 401–416
Williams PH (1985) A preliminary cladistic investigation of relationships among the bumble bees (Hymenoptera, Apidae). Syst Entomol 10: 239–255
Williams PH (1994) Phylogenetic relationships among bumble bees (Bombus Latr.): a reappraisal of morphological evidence. Syst Entomol 19: 327–344
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Schmid-Hempel, R., Schmid-Hempel, P. Host choice and fitness correlates for conopid flies parasitising bumblebees. Oecologia 107, 71–78 (1996). https://doi.org/10.1007/BF00582236
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DOI: https://doi.org/10.1007/BF00582236