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Titolo:
SELECTING THE FLAT OYSTER OSTREA-EDULIS (L) FOR SURVIVAL WHEN INFECTED WITH THE PARASITE BONAMIA-OSTREAE
Autore:
NACIRIGRAVEN Y; MARTIN AG; BAUD JP; RENAULT T; GERARD A;
Indirizzi:
UNIV LAUSANNE,IZEA,BATIMENT BIOL CH-1015 LAUSANNE SWITZERLAND IFREMER,LAB GENET AQUACULTURE & PATHOL F-17390 LA TREMBLADE FRANCE IFREMER,STN LA TRINITE F-56470 TRINITE SUR MER FRANCE IFREMER,STN BOUIN F-85230 BEAUVOIR SUR MER FRANCE
Titolo Testata:
Journal of experimental marine biology and ecology
fascicolo: 1, volume: 224, anno: 1998,
pagine: 91 - 107
SICI:
0022-0981(1998)224:1<91:STFOO(>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADDITIVE GENETIC VARIANCE; GALICIA NW SPAIN; RIA-DE-VIGO; POPULATION BOTTLENECKS; HAPLOSPORIDIUM-NELSONI; FOUNDER EVENTS; EPISTASIS; HEMOCYTES; AGE;
Keywords:
OSTREA EDULIS; BONAMIA OSTREAE; DISEASE RESISTANCE OR TOLERANCE; INOCULATION; SELECTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
Y. Nacirigraven et al., "SELECTING THE FLAT OYSTER OSTREA-EDULIS (L) FOR SURVIVAL WHEN INFECTED WITH THE PARASITE BONAMIA-OSTREAE", Journal of experimental marine biology and ecology, 224(1), 1998, pp. 91-107

Abstract

In the early 1970s, the appearance of the protozoan parasite Marteilia refringens restricted the production of the European flat oyster Ostrea edulis to subtidal areas. Ten pears later a second protozoan parasite, Bonamia ostreae, caused a further serious decline in Bat oyster farming in subtidal areas. Prophylactic measures were taken to sustain oyster farming, but the continuing presence of the two parasites led to the initiation of a programme to select for resistant oysters. Efforts were concentrated on B. ostreae and two selected strains were obtained in 1985 (S85) and 1989 (S89). The programme was based on mass selection and parasite inoculation or natural infections, This paper focuses on the survival and weights of the third generation of S85 (S85-G3), the second generation of S89 (S89-G2) and a cross between S85-G2 andS89-G1. The % survival of S85-G3 oysters was more than 4-times higherthan the control group after a 20 month experiment in the wild, and significant differences in parasite prevalence were recorded. No significant differences between S89-G2 and the control group were observed for either survival or parasite prevalence. This was attributed either to a less powerful experiment or to the effect of genetic load clearing as a result of inbreeding. The % survival of the cross between the two strains was more than twice as high as the control group and significant differences were recorded for parasite prevalence. Good evidencefor additivity of the resistance was provided by both the intermediate behaviour of a cross between S85-G2 and the controls and the rapid improvement that was obtained from the first generations. The selected strains showed a tendency toward higher weights and higher weight variances when compared to controls. These populations are suspected to have undergone bottlenecks, which would explain the increase in phenotypic variance. No measurable natural resistance has arisen in the wild, This could be due first to the relatively short time that has elapsed since the first infections, secondly to the early sale of resistant oysters as soon as they reach a marketable size, and thirdly to the slowkinetics of B. ostreae infection that allows both susceptible and potentially resistant oysters to participate in recruitment. Improved resistance seems to be related to the delayed mortality of selected oysters. This last result is discussed in the light of a previous study conducted in the laboratory which showed that resistant and susceptible oysters have different haemograms. (C) 1998 Elsevier Science B.V.

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Documento generato il 29/11/20 alle ore 16:07:52