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25 May 2022 Homogeneity of Photosynthetic Features in Canopy-Forming Macroalgae of The Order Fucales from Shallow and Sheltered Environments
Enric Ballesteros, Natàlia Sant
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Abstract

Photosynthetic features of different canopy-forming macroalgae of the order Fucales (Phaeophyceae) living in shallow and sheltered environments show a high homogeneity when compared with other morphologically similar species living across a depth gradient. Photosynthesis at saturation (situated around 5 mg O2 gAFDM 1 h1) and photosynthetic efficiency [around 0.4 mg O2·m2 s (µmol photon·gAFDM·h)-1] are relatively low, while dark respiration (around 1 mg O2 gAFDM 1 h1) and light at compensation (around 24 µmol photon·m-2·s-1) are relatively high, as it corresponds to the characteristics of “sun” plants. C:N and C:P ratios suggest a strong nutrient limitation for growth and photosynthesis, in agreement with the low dissolved nutrient levels usually found in shallow Mediterranean waters. Homogeneity in photosynthetic features points to a good local adaptation of the different species to the prevailing light conditions but opens the question of which are the factors allowing the coexistence of different species of Fucales in sheltered and shallow Mediterranean environments.

© Publications scientifiques du Muséum national d'Histoire naturelle, Paris.
Enric Ballesteros and Natàlia Sant "Homogeneity of Photosynthetic Features in Canopy-Forming Macroalgae of The Order Fucales from Shallow and Sheltered Environments," Cryptogamie, Algologie 43(6), 107-115, (25 May 2022). https://doi.org/10.5252/cryptogamie-algologie2022v43a6
Received: 17 February 2021; Accepted: 28 April 2022; Published: 25 May 2022
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KEYWORDS
forêt marine
Fucales
Fucales
infralittoral peu profond
light
lumière
macroalgae
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