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Titolo:
DROSOPHILA-SUBOBSCURA FEMALES PREFERENTIALLY SELECT LONG SPERM FOR STORAGE AND USE
Autore:
BRESSAC C; HAUSCHTECKJUNGEN E;
Indirizzi:
UNIV TOURS,FAC SCI,IBEAS,URA CNRS 1298,PARC GRANDMONT F-37200 TOURS FRANCE UNIV ZURICH,INST ZOOL CH-8057 ZURICH SWITZERLAND
Titolo Testata:
Journal of insect physiology
fascicolo: 4, volume: 42, anno: 1996,
pagine: 323 - 328
SICI:
0022-1910(1996)42:4<323:DFPSLS>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIZE CLASSES; SPERMATOZOA; LENGTH; MALES;
Keywords:
DROSOPHILA SUBOBSCURA; SHORT SPERM; LONG SPERM; SPERM TRANSFER; SPERM STORAGE; SPERM UTILIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
C. Bressac e E. Hauschteckjungen, "DROSOPHILA-SUBOBSCURA FEMALES PREFERENTIALLY SELECT LONG SPERM FOR STORAGE AND USE", Journal of insect physiology, 42(4), 1996, pp. 323-328

Abstract

Drosophila subobscura males produce short and long sperm. From a total of approx. 20,000 sperm transferred per copulation, 66% were short and 34% long. Thirty hours after copulation females had stored approx. 900 sperm in the receptacle and spermathecae. The remaining 19,000 sperm were eliminated from the uterus. Females preferentially selected the long sperm from the ejaculate for storage, but the percentages of long sperm were different in the two storage organs. In the receptacle 89% were long sperm and in the spermathecae 80%. While the ratio of short to long sperm in the receptacle was constant, the ratio varied in the spermathecae. After seven days of egg laying only one third of the initial amount of sperm remained in the storage organs. At this time the percentage of short sperm was higher than just after storage, indicating that long sperm were preferentially used for fertilization. We monitored the entire egg laying periods of females which mated once, counting all inseminated eggs; the number of hatched eggs each resulted from a fertilizing sperm. Additionally, we recorded those sperm which did not penetrate the egg but were found outside of the egg on the chorion. The sum of fertilizing sperm plus the sperm on the chorion (916)matched perfectly the mean number of stored sperm per female (915).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 20:44:07