Differences between two chain forming, athecate, red tide dinoflagellates: Gymnodinium catenatum Graham and Gyrodinium sp.
1995
Fraga, S. (Santiago) | Bravo, I. (Isabel) | Delgado, M. (Maximino) | Franco, J.M. (José Mariano) | Zapata, M. (Manuel)
Gyrodinium sp. has bloomed in coastal waters of Valencia,west Mediterranean sea. At a first sight, it appeared to be the toxicGymnodinium catenatum, but after a more careful observation, thecells showed clear differences. Gyrodinium sp. brought into culturewas non toxic, and compared with G. catenatum, it is smaller in size,slightly different in shape, forms shorter chains, has larger and morerounded chloroplasts and has a different behavior. Although it is notvery difficult to distinguish them observing living samples, when fixedwith Lugol's solution, it can be very difficult. This fact presents seriousproblems for monitoring programmes as sometimes both species canbe present together as has happened in the Galician rías during somesummers.
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