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- W2186466872 abstract "Alexandrium catenella is a dinoflagellate that produces Paralytic Shellfish Poison (PSP). It is widely distributed in coastal waters around the world, and forms large devastating blooms in southern Chile. Several strains were collected from Magellanic fjords and channels to study its life cycle and to assess its growth rate at various levels of salinity. Compared with field-collected cells, vegetative cells cultured in the laboratory were smaller, rounder, and formed shorter chains. Pellicle cysts formed rapidly under stress conditions when observed on microscope. This type of cyst was found in the gut of shellfish collected in the field. The sexual life cycle included isogametes that formed a large planozygote, which formed into a thick-walled resting cyst. All stages presented minor morphological differences compared with others closely related species in the genus. Formation of gametes was mainly restricted to the stationary phase of growth, and was probably induced by nutrient depletion. The maximum growth rate attained in cultures simulating summertime water conditions (i.e., 11 °C and salinity of 15–30 psu) was low, ranging from 0.18 to 0.35 divisions day –1 . These data support the hypothesis that massive excystment is the main cause of the intense blooms in the Magellanic fjords and channels. The localization and study of cyst reservoirs and the factors that promote excystment should be a priority in terms of understanding the processes that trigger extensive blooms in Magellanic waters." @default.
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- W2186466872 date "2010-01-01" @default.
- W2186466872 modified "2023-09-27" @default.
- W2186466872 title "ALEXANDRIUM CATENELLA (WHEDON & KOFOID) BALECH, 1985, IN" @default.
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