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Études sur la libération des tétraspores chez Padina tetrastromatica Hauck
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ISBN10: 6209915035
ISBN13: 9786209915031
Publisher: Editions Notre Savoir
Published: May 11 2026
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786209915031
Publisher: Editions Notre Savoir
Published: May 11 2026
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: French
Les études sur la libération des tétraspores ont montré une variation saisonnière chez cette algue brune, avec un pic de libération des spores au mois de février. Une périodicité diurne a été observée, avec un pic de production de spores entre 6 h et 10 h au cours des huit mois de l'année où elle est présente sur la côte, sans aucun décalage du pic de libération. L'effet des facteurs environnementaux sur la libération de spores et la périodicité diurne a été étudié. La libération de spores a diminué avec l'augmentation de la durée d'exposition des frondes à l'air, et la quantité maximale de spores a été obtenue dans des conditions submergées. La libération de spores a également varié en fonction des différentes salinités, et le pic de libération a été observé à une salinité de 35 %. La quantité de spores libérées à différentes intensités lumineuses a également varié, et la libération maximale a été observée à une intensité lumineuse de 1 000 lux. La libération maximale de spores a été observée lors d'un cycle de 24 heures de lumière et 0 heure d'obscurité, et les expériences menées avec des lumières colorées de différentes longueurs d'onde montrent que la production de spores était maximale sous la lumière blanche. Les paramètres environnementaux tels que la dessiccation, la salinité et les longueurs d'onde n'ont pas eu d'effet sur la périodicité diurne, mais la libération de spores a varié en fonction de l'intensité lumineuse et de la photopériode.
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