Phytoplankton from Las Tablas de Daimiel National Park. III. Diatoms and chlorophytes

[摘要] Las Tablas de Daimiel National Park is an important semi-arid wetland, biodiversity reserve, that is experiencing an accelerated eutrophication process and dramatic hydrological changes in recent years. This paper reports the taxonomy, dynamics and ecology of 9 planktonic diatoms (2 centric, 7 pennate) and 37 chlorophytes (24 coccoids. 8 flageflated and 5 species of other groups) which were found from 1996 to 1998. Despite the higher diversity of Chlorococcales, diatoms made a major contribution to algal biomass. Most species are typical of eutrophic systems and some are salinity indicators ( Chaetoceros muelleri). Scenedesmus quadricauda, Cyclotella meneghinianaandNitzschia aciculariswere the most common species.Pteromonas limneticais a new record for Spain. There was a remarkable decrease in phytoplankton density and a 50 % species substitution in comparison to the drier period 1992-1993. Species distribution through the wetland was very heterogeneous spatially and temporally, without any pattern.

[学科分类] 植物学

[关键词] Bacillariophyceae;Chlorophyta;phytoplankton;eutrophication;wetland;Castilla-La Mancha;Spain