Specific composition and ecology of chrysophyteflagellates in Lake Sanabria (NW Spain)

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• 作者：De Hoyos ; Caridad ; Aldasoro ; Juan José ; Toro ; Manuel ; Comí ; n ; Francisco A.
• 刊名：Hydrobiologia
• 出版年：1998
• 出版时间：1998
• 年：1998
• 卷：369/370
• 页码：287-295
• 全文大小：280 KB

文摘

Lake Sanabria is a glacial lake located at 1000 m a.s.l. in NW Spain.Its water is characterised by a low content of mineral salts, rather low pH,and oligotrophic status, which are all currently viewed as being favorablefor Chrysophyte growth and proliferation. The study of the phytoplankton atdifferent depths of the water column for three years showed thatChrysophytes were one of the groups of algae less well-represented in thephytoplankton (1% and 8%, respectively, for numbers of cellsand biovolume).

Ochromonas, Pseudopedinella, Mallomonas and Dinobryon werethe more representative chrysophyte genera. D. cylindricum, D. divergens andD. crenulatum were some of the Dinobryon species observed. M. akrokomos, M.crassisquama and M. costata were among the most frequent Mallomonasspecies. Observations on the Chrysophyte cysts from samples of the lakesediment suggest that variability of representation is higher than inplanktonic samples.

The maximum values of Chrysophyte biovolume were foundin the nutrient-exhausted epilimnion of summer and autumn which could berelated to the mixotrophic capabilities of several species.