Anales del Jardín Botánico de Madrid, Vol 62, No 1 (2005)

Efectos antrópicos sobre las praderas sumergidas de carófitos en una laguna cárstica


https://doi.org/10.3989/ajbm.2005.v62.i1.28

Alejandro Sosnovsky
Dpto. de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Argentina

Santos Cirujano
Real Jardín Botánico, Madrid, Spain

Miguel Ángel Cobelas
Centro de Ciencias Medioambientales, Madrid, Spain

Miriam Moreno Pérez
Real Jardín Botánico, Madrid, Spain

Elisa Piña
Centro de Ciencias Medioambientales, Madrid, Spain

Abstract


Charophytes are submerged macrophyte algae often found in diverse aquatic habitats. Chara-dominated lakes are typically hard water, calcium-rich and low in phosphate. La Colgada is a 18 m deep, 103 ha small lake located in a tourist area, which has partly resulted in nutrient increases in recent years. Chara hispida var. major (Hartm.) R.D. Wood and Chara hispida f. polyacantha (A. Braun) R.D. Wood meadows are extensive in this ecosystem, but their distribution are influenced by human activities. Negligible densities of C. hispida, always covered by epiphytes, were recorded in the shores adjacent to tourist areas. Horizontal cover and biomass distributions were heterogeneous throughout the lake (0,95 ± 0,55 kg DW•m-2), with minimum values nearby the tourist area (0,68 ± 0,32 kg DW•m-2). Charophyte biomass was inversely related to depth in areas not influenced by anthropogenic impacts. However, that relationship did not occur in anthropized areas. The biomass range of Charophytes in La Colgada lake, 0,22-2,27 kg DW•m-2, was much higher than that recorded in other world lakes and wetlands.

Keywords


biomass; Charophytes; distribution; eutrophication; lakes; Spain

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