Efectos antrópicos sobre las praderas sumergidas de carófitos en una laguna cárstica
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 yea...
| Published in: | Anales del Jardín Botánico de Madrid |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | Spanish |
| Published: |
Consejo Superior de Investigaciones Científicas
2005
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| Subjects: | |
| Online Access: | https://rjb.revistas.csic.es/index.php/rjb/article/view/28 https://doi.org/10.3989/ajbm.2005.v62.i1.28 |
| Summary: | 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. Los carófitos son algas macrófitas que viven sumergidas en aguas con características físico-químicas muy diferentes. La Colgada es una laguna de 103 ha y 18 m de profundidad máxima ubicada en una zona de gran afluencia turística (Parque Natural Las Lagunas de Ruidera, Albacete-Ciudad Real), en la que los nutrientes han ido aumentando durante las últimas décadas. Los fondos de esta laguna están cubiertos parcialmente por formaciones monoespecíficas de Chara hispida var. major (Hartm.) R.D. Wood y Chara hispida f. polyacantha (A. Braun) R.D. Wood, cuya distribución está siendo afectada por las actividades humanas. Las densidades más bajas de C. hispida, siempre cubierta por abundantes algas epífitas filamentosas, se registraron en los bordes próximos a la zona más urbanizada. La distribución horizontal y la biomasa seca de C. hispida fueron heterogéneas en la laguna (0,95 ± 0,55 kg PS•m-2) y los valores mínimos se encontraron ... |
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