The effect of crowding on adult populations ofDelia (=Hylemya) antiqua (Meigen) |
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Authors: | G Zurlini A S Robinson |
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Institution: | 1. Association Euratom-ITAL, 6700 AA, Wageningen, The Netherlands
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Abstract: | Using 5 density levels, the effect of increasing density was studied on several population statistics of adult Delia (=Hylemya) antiqua. Amongst the statistics studied were adult lifespan; female mating frequency, fecundity and egg hatchability. It was shown that females lived significantly longer than males and that increasing density significantly reduced lifespan. Density had no effect on mating frequency. Total fecundity/female was significantly reduced with increasing density but oviposition rate was density independent. Using these statistics, mean generation time T, net reproduction rate R0 and capacity for increase rc were calculated at the different density levels. Values of R0 showed a one-tailed response but there was no clear effect of density on rc. Multiple comparisons between variables revealed several important relationships. - Adult lifespan was the most important factor affecting egg production.
- Number of mated females was more important in affecting total fecundity/cage than adult density.
It could also be calculated that to produce the effect of one single mated female on total fecundity/cage the overall density would have to be reduced by 0.0023 individuals/cm3. These results are discussed in the context of efficient laboratory rearing of the onion fly. |
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Keywords: | Density Level Oviposition Rate Oviposition Period Adult Density Mass Rear |
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