Actividad fotosintética de macroalgas a lo largo de un gradiente batimétrico: variabilidad interespecífica y estacional

Autores/as

DOI:

https://doi.org/10.3989/scimar.04995.06A

Palabras clave:

macroalgas, fotosíntesis, gradientes de profundidad, eficiencia, luz

Resumen


Las macroalgas marinas se distribuyen de forma desigual en profundidad, observándose una substitución de las especies dominantes a lo largo del eje batimétrico. Como la luz muestra una disminución muy marcada con la profundidad y es un factor crítico para el crecimiento de las algas, nuestra hipótesis es que aquellas especies que dominan a una cierta profundidad son las que están mejor adaptadas al ambiente lumínico de esa profundidad. Para comprobarlo hemos seleccionado siete especies de algas marinas mediterráneas distribuidas entre 0 y 50 m de profundidad y hemos calculado sus parámetros fotosintéticos. Las respuestas fotosintéticas muestran grandes diferencias entre especies, con las eficiencias fotosintéticas que aumentan al aumentar la profundidad donde crecen las algas. Sin embargo, tanto la producción de oxígeno a elevados niveles de luz como la respiración no están relacionadas con la profundidad, y parecen determinadas por otros factores como el grosor del talo o la disponibilidad de nutrientes. Algunas especies muestran valores de producción elevados, en sintonía con su alta productividad y rápido crecimiento, mientras que otras muestran bajos valores de producción pero una elevada biomasa y perdurabilidad. Así pues, las especies que dominan en cada ambiente lumínico parecen ser aquellas que utilizan de mejor manera la luz disponible donde crecen para completar con éxito su ciclo de vida.

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2020-03-30

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Sant N, Ballesteros E. Actividad fotosintética de macroalgas a lo largo de un gradiente batimétrico: variabilidad interespecífica y estacional. Sci. mar. [Internet]. 30 de marzo de 2020 [citado 29 de julio de 2026];84(1):7-16. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1840

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