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Proc Biol Sci. Feb 7, 2000; 267(1440): 307–313.
PMCID: PMC1690520

The evolution of sperm length in moths.

Abstract

Sperm form and function remain poorly understood despite being of fundamental biological importance. An instructive approach has been to examine evolutionary associations across comparable taxa between sperm characters and other, potentially selective reproductive traits. We adopt this approach here in a comparative study examining how sperm lengths are associated with male and female reproductive characters across moths. Primary data have revealed Lepidoptera to be an ideal order for examination: there is profound variation in the dimensions (but not organization) of the reproductive traits between closely related species which all share a monophyletic ancestry, for example, eupyrene sperm length varies from 110 to 12,675 microm. Eupyrene (normal fertilizing) and apyrene (anucleate and non-fertile) sperm lengths are positively correlated across taxa and both sperm types show positive associations with mating pattern (as measured by the residual testis size). At fertilization, eupyrene sperm must migrate down the often elongated female spermathecal duct from storage to unite with the ovum. Across taxa, the elongation of this duct is associated with increased eupyrene sperm length, suggesting a positive female influence on sperm size since longer, more powerful sperm may be selected to migrate and/or compete successfully down greater ductal lengths. Apyrene sperm length is not associated with female reproductive tract dimensions. However, we found a positive relationship between the residual testis volume and spermathecal volume, suggesting coevolution between male investment in spermatogenesis and the extent of the female sperm storage capacity. Within males, there is a positive association between the two organs which form the ejaculate-containing spermatophore: the testes and the accessory gland. The 'trade-up' in investment to these components is discussed in relation to paternal investment and mating patterns.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Beatty RA. The genetics of the mammalian gamete. Biol Rev Camb Philos Soc. 1970 Feb;45(1):73–119. [PubMed]
  • Briskie JV, Montgomerie R. Sperm size and sperm competition in birds. Proc Biol Sci. 1992 Feb 22;247(1319):89–95. [PubMed]
  • Gage MJ. Mammalian sperm morphometry. Proc Biol Sci. 1998 Jan 22;265(1391):97–103. [PMC free article] [PubMed]
  • Gomendio M, Roldan ER. Sperm competition influences sperm size in mammals. Proc Biol Sci. 1991 Mar 22;243(1308):181–185. [PubMed]
  • Harcourt AH, Harvey PH, Larson SG, Short RV. Testis weight, body weight and breeding system in primates. Nature. 1981 Sep 3;293(5827):55–57. [PubMed]
  • Hosken DJ. Sperm competition in bats. Proc Biol Sci. 1997 Mar 22;264(1380):385–392. [PMC free article] [PubMed]
  • LaMunyon CW, Eisner T. Spermatophore size as determinant of paternity in an arctiid moth (Utetheisa ornatrix). Proc Natl Acad Sci U S A. 1994 Jul 19;91(15):7081–7084. [PMC free article] [PubMed]
  • Pitnick S, Markow TA, Spicer GS. Delayed male maturity is a cost of producing large sperm in Drosophila. Proc Natl Acad Sci U S A. 1995 Nov 7;92(23):10614–10618. [PMC free article] [PubMed]
  • Presgraves DC, Baker RH, Wilkinson GS. Coevolution of sperm and female reproductive tract morphology in stalk-eyed flies. Proc Biol Sci. 1999 May 22;266(1423):1041–1041. [PMC free article]
  • Short RV. The testis: the witness of the mating system, the site of mutation and the engine of desire. Acta Paediatr Suppl. 1997 Jul;422:3–7. [PubMed]

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