Kg. Heller et al., THE CHEMICAL-COMPOSITION OF THE SPERMATOPHORE IN SOME SPECIES OF PHANEROPTERID BUSH-CRICKETS (ORTHOPTERA, TETTIGONIOIDEA), Journal of insect physiology, 44(10), 1998, pp. 1001-1008
Male bushcrickets transfer large spermatophores of up to 40% of male b
ody mass to the females during mating. These large nuptial gifts are l
ater consumed by the female and have been shown to affect the size and
number of eggs laid after mating in some species. The composition of
the spermatophores in five species of phytophagous phaneropterid bushc
rickets (genera Ancistrura, Barbitistes, Metaplastes, Poecilimon) was
examined in respect to water content, elemental composition, protein c
oncentration, and the content of lipids, carbohydrates, urea and uric
acid. In addition, the amino acid composition of the spermatophore was
compared with that of the egg proteins. In all species, water content
was found to be about 85% of wet mass. Eleven to 16% of the dry mass
consisted of nitrogen, corresponding to a protein content of about 70
to more than 90% of the dry mass. Urea and uric acid were only present
in traces. The proteins contained a high amount of glycine (about 26
mol %), together with asparagine/aspartic acid, 12% and glutamic acid,
11%, which differed distinctly from the amino acid composition of the
egg proteins. The results are discussed with respect to the advantage
s the male may receive by producing these large nuptial gifts. (C) 199
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