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'Spreading of the risk' in developmental mortality: size, fecundity and reproductive rate in the black bean aphid



'Spreading of the risk' in developmental mortality: size, fecundity and reproductive rate in the black bean aphid



Entomologia Experimentalis et Applicata 283: 301-312



In contrast to small (200 .mu.g) apterous exules of A. fabae, large individuals (1000 .mu.g) contain twice as many embryos, more of which are well-developed. Large individuals start reproducing earlier and achieve their maximum reproductive rate earlier in adult life, have a higher reproductive rate overall, and produce larger offspring. The fecundity achieved at 20.degree. is slightly less than the number of embryos present at the adult molt, at which time no more embryos are generated. Small aphids have a longer reproductive period but the same length of adult life as large aphids. The tendency of many aphids not to maximize their reproductive rate but to spread their offspring both in space and time, and use the heterogeneity in habitat quality, was possibly important in determining the success of aphids.

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Accession: 000803095

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DOI: 10.1111/j.1570-7458.1980.tb03030.x


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