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| Borcier, Elodie; Morvezen, Romain; Boudry, Pierre; Miner, Philippe; Charrier, Gregory; Laroche, Jean; Hegaret, Helene. |
| Dinoflagellates of the genus Alexandrium are a major cause of harmful algal blooms (HABs) that have increasingly disrupted coastal ecosystems for the last several decades. Microalgae from the genus Alexandrium are known to produce paralytic shellfish toxins (PST) but also bioactive extracellular compounds (BEC) that can display cytotoxic, allelopathic, ichtyotoxic or haemolytic effects upon marine organisms. The objective of this experimental study was to assess the effects of PST and BEC produced by A. minutum upon juvenile great scallops Pecten maximus. Scallops were exposed for one week to two different strains of A. minutum, the first producing both PST and BEC and the second producing only BEC. Escape response to starfish, daily shell growth,... |
| Tipo: Text |
Palavras-chave: Harmful Algal Bloom (HAB); Alexandrium minutum; Pecten maximus; Paralytic Shellfish Toxins (PST); Extracellular compounds; Behaviour; Histology. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00368/47878/47893.pdf |
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| Morvezen, Romain; Charrier, Gregory; Boudry, Pierre; Chauvaud, Laurent; Breton, Florian; Strand, Oivind; Laroche, Jean. |
| The great scallop Pecten maximus is harvested in several European countries and fisheries targeting this species are severely regulated by fishing quotas. In addition, hatchery-based population enhancement has been developed in some countries to provide alternative or complementary production. The genetic structure of wild populations of P. maximus and the potential impact of aquaculture on the genetic diversity of this species remains poorly documented. In this study, we explored the genetic structure of P. maximus using 12 microsatellite markers, considering 14 populations sampled from Galicia (Spain) to the North of Norway, and one population of Pecten jacobaeus (L., 1758) from the Lion Gulf (Mediterranean Sea). Results indicated a clear differentiation... |
| Tipo: Text |
Palavras-chave: Great scallop; Pecten maximus; Microsatellites; Population genetics; Aquaculture. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00311/42251/41692.pdf |
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| Morvezen, Romain; Cornette, Florence; Charrier, Gregory; Guinand, Bruno; Lapegue, Sylvie; Boudry, Pierre; Laroche, Jean. |
| We report the isolation, development and multiplex optimisation of 12 new microsatellite loci for the great scallop, Pecten maximus. Diversity was moderate to high, with number of alleles ranging from 4 to 20 and observed heterozygosity between 0.28 and 0.88. Progeny produced in a commercial hatchery was used to test locus power for parentage assignment. The percentage of offspring that was unambiguously assigned to a unique pair of parents was 97% (software package CERVUS-COLONY). Parentage assignment revealed that 22% of the studied progeny resulted from unplanned crosses. Effective population size of the study progeny was also estimated. Our study illustrates the power of microsatellites for the genetic monitoring of hatchery-produced great scallops. |
| Tipo: Text |
Palavras-chave: Microsatellites; Polymerase chain reaction; Parentage; Assignment; Bivalve mollusc. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00137/24822/22907.pdf |
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| Harney, Ewan; Lachambre, Sebastien; Roussel, Sabine; Huchette, Sylvain; Enez, Florian; Morvezen, Romain; Haffray, Pierrick; Boudry, Pierre. |
| Selective breeding strategies require pedigree information over generations, but many species produced in aquaculture are too small to be physically tagged at early stages. Consequently, maintaining a sufficient number of separate families is often needed but costly and logistically difficult. Alternatively, parentage assignment can be obtained using DNA markers. We developed a panel of single nucleotide polymorphism (SNP) markers for the European abalone Haliotis tuberculata using an existing transcriptomic resource. An initial set of 2,176,887 SNPs was filtered to select 500 for high throughput genotyping. Of these, 298 SNPs were amplified in at least 90% of our H. tuberculata samples, consisting of a mixed family cohort (945 offspring) generated by... |
| Tipo: Text |
Palavras-chave: Abalone; Parentage assignment; Pedigree; Selective breeding; Transcriptome; SNP. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00429/54061/55396.pdf |
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