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Titolo:
Performance of non-motile male gametes in the sea: analysis of paternity and fertilization success in a natural population of a red seaweed, Gracilaria gracilis
Autore:
Engel, CR; Wattier, R; Destombe, C; Valero, M;
Indirizzi:
Univ Lille 1, CNRS, UPRESA 8016,GDR 1002,FR 1818, Lab Genet & Evolut Populat Vegetables, F-59655 Villeneuve Dascq, France Univ Lille 1 Villeneuve Dascq France F-59655 55 Villeneuve Dascq, France
Titolo Testata:
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
fascicolo: 1431, volume: 266, anno: 1999,
pagine: 1879 - 1886
SICI:
0962-8452(19990922)266:1431<1879:PONMGI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MALE REPRODUCTIVE SUCCESS; ASCIDIAN BOTRYLLUS-SCHLOSSERI; GENE FLOW; EXTERNAL FERTILIZATION; CHAMAELIRIUM-LUTEUM; WILD RADISH; SPERM; POLLEN; ALGA; RHODOPHYTA;
Keywords:
fertilization success; paternity analysis; gamete dispersal; cystocarp; red alga; spermatia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Valero, M Univ Lille 1, CNRS, UPRESA 8016,GDR 1002,FR 1818, Lab Genet & Evolut Populat Vegetables, Bat SN2, F-59655 Villeneuve Dascq, France Univ Lille 1 Bat SN2 Villeneuve Dascq France F-59655 cq, France
Citazione:
C.R. Engel et al., "Performance of non-motile male gametes in the sea: analysis of paternity and fertilization success in a natural population of a red seaweed, Gracilaria gracilis", P ROY SOC B, 266(1431), 1999, pp. 1879-1886

Abstract

In haploid-diploid red seaweeds, the dispersal of male gametes is presumedlimited due to their lack of flagella. It has been suggested that this group suffers from sperm limitation and, consequently, that fertilization is relatively inefficient. Fertilization in most floridean rhodophytes results in the formation a cystocarp, a swelling on the haploid female thallus housing the diploid zygote and its thousands of diploid daughter spores. To study the performance of non-motile male gametes in the sea, we evaluated bothfemale and male fertilization success in a natural population of the red marine alga Gracilaria gracilis. Female fertilization success, estimated by cystocarp yield per unit female thallus, was evaluated with respect to the availability of male gametes. Male fertilization success, estimated by the individual contribution of different males to zygotes, was assessed by paternity analyses on 350 cystocarps produced in one reproductive season using two microsatellite loci. The results show that cystocarp yield is not spermlimited and th;lt the large variation in male fertilization success cannotbe solely explained by the distance travelled by the male gamete to find amate. Taken together, the results suggest that, not only is fertilization efficient, but that male-male competition and/or female choice may play a role in shaping population mating patterns.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 18:02:06