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Titolo:
MULTIPLE MORPHS OF SPERM WERE REQUIRED FOR THE EVOLUTION OF THE SEX-RATIO TRAIT IN DROSOPHILA
Autore:
BIRCHER U; JUNGEN H; BURCH R; HAUSCHTECKJUNGEN E;
Indirizzi:
UNIV ZURICH,INST ZOOL,WINTERTHURERSTR 190 CH-8057 ZURICH SWITZERLAND UNIV ZURICH,INST ZOOL CH-8057 ZURICH SWITZERLAND
Titolo Testata:
Journal of evolutionary biology
fascicolo: 5, volume: 8, anno: 1995,
pagine: 575 - 588
SICI:
1010-061X(1995)8:5<575:MMOSWR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEIOTIC DRIVE; PSEUDOOBSCURA; POLYMORPHISM; SUBOBSCURA; SELECTION; MALES;
Keywords:
DROSOPHILA SUBOBSCURA; SEX RATIO; SPERM HETEROMORPHISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
U. Bircher et al., "MULTIPLE MORPHS OF SPERM WERE REQUIRED FOR THE EVOLUTION OF THE SEX-RATIO TRAIT IN DROSOPHILA", Journal of evolutionary biology, 8(5), 1995, pp. 575-588

Abstract

In Sex Ratio males of D. subobscura Y sperm degenerate. Nevertheless,Sex Ratio males can produce as many offspring as non-Sex Ratio males. In order to find an explanation for the high number of offspring of Sex Ratio males we analysed spermatogenesis and sperm storage in females. Because D. subobscura has two morphs of sperm, short and long sperm, we studied the relationship of sperm heteromorphism to the Sex Ratiotrait in this species. Spermatids of both lengths developed simultaneously in the testes. The first mature sperm produced by a young male were nearly all short sperm. This result indicates that short cysts need less time to mature than long cysts. Thus in a given time more shortcysts than long cysts can mature. In the testes of Sex Ratio males more short cysts and fewer long cysts were formed than in the testes of non-Sex Ratio males. Thus in a unit time Sex Ratio males can produce as many or more sperm than non-Sex Ratio males. Females mated to Sex Ratio males had more sperm in their storage organs than those which weremated to non-Sex Ratio males. From the transferred sperm females stored selectively more long than short sperm after mating to a Sex Ratio male than after mating to a non-Sex Ratio male. The effect of the highamount of sperm in Sex Ratio males is twofold: the loss of Y sperm iscompensated, and probably in nature a second copulation is prevented by the complete filling of the female storage organs. From these results we conclude that the development and persistence of the Sex Ratio trait in natural populations depends on the presence of sperm heteromorphism.

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Documento generato il 04/12/20 alle ore 06:51:38