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Cost of Sex in Aphids: Size of Males at Birth and the Primary Sex Ratio in Sitobion avenae (F.)

C. Newton and A. F. G. Dixon
Functional Ecology
Vol. 1, No. 4 (1987), pp. 321-326
DOI: 10.2307/2389787
Stable URL: http://www.jstor.org/stable/2389787
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cost of Sex in Aphids: Size of Males at Birth and the Primary Sex Ratio in Sitobion avenae (F.)
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Abstract

Although Sitobion avenae (F.) was less fecund under sexual-inducing photoperiods it did not produce a significantly lower biomass of offspring than apterae reared under long daylength. The lower fecundity is due to the cost of developing the larger male embryos; at birth males were significantly heavier and denser than females. The primary sex ratio in S. avenae is approximately two females to one male but is equal in terms of biomass.

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