La importancia de la producción fitoplanctónica para los balances de carbono en un humedal semiárido de llanura de inundación

  1. Álvarez Cobelas, Miguel
  2. Angeler, David G.
  3. Cirujano Bracamonte, Santos María
  4. Rojo, Carmen
Revista:
Anales del Jardín Botánico de Madrid

ISSN: 0211-1322

Año de publicación: 2011

Volumen: 68

Número: 2

Páginas: 253-267

Tipo: Artículo

DOI: 10.3989/AJBM.2271 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Otras publicaciones en: Anales del Jardín Botánico de Madrid

Resumen

La producción de fitoplancton (PF) en los humedales no se mide tan a menudo como la de los macrófitos. En este estudio se lleva a cabo un trabajo de tres años durante un periodo de gran inun dación en un humedal de llanura de inundación (Parque Nacional de Las Tablas de Daimiel) a fin de determinar la producción neta del fitoplancton, su heterogeneidad espacial y los factores que la controlan. También comparamos la PF con la producción primaria de las comunidades de macrófitos, lo cual nos permite estimar las cantidades de carbono que fija cada comunidad vegetal. Todas las variables relacionadas con la PF mostraron mucha variabilidad espacial y temporal, lo cual dio como resultado una escasa relación entre la producción de unos lugares y otros, incluso cuando la inundación los conectó a todos. La PF neta estuvo entre un 25 y un 36% de la producción de los macrófitos sumergidos y entre un 3 y un 10% de la producción de los helófitos. La PF neta estuvo controlada por algas de diferente tamaño en los distintos sitios del humedal. Ni los nutrientes ni el zooplancton afectaron a la PF neta o a su productividad. La gran variabilidad espacio-temporal de la PF en los humedales se debe a una serie de procesos complejos que afectan al ambiente luminoso subacuático. Las cantidades de carbono fijadas por el fitoplancton a menudo superan a las de los macrófitos sumergidos y pueden llegar a suponer entre un 4 y un 37% del carbono de los helófitos. Considerada normalmente como marginal, la PF en las aguas libres de los humedales debería tenerse en cuenta a la hora de determinar con precisión la cantidad de carbono de los humedales, especialmente en periodos de gran inundación que a menudo dan como resultado cambios en el balance de carbono

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