AB 7:159-172 (2009)  -  DOI: https://doi.org/10.3354/ab00186

Acclimation of Red Sea macroalgae to solar radiation: photosynthesis and thallus absorptance

Félix L. Figueroa1,*, Brezo Martínez2, Alvaro Israel3, Amir Neori4, Erik-jan Malta5, Put Ang Jr.6, Sven Inken7, Ronny Marquardt8, Tamar Rachamim3, Uri Arazi3, Sammy Frenk3, Nathalie Korbee1

1Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, Campus Universitario de Teatinos s/n, 29071 Málaga, Spain
2Área de Biodiversidad y Conservación, Universidad Rey Juan Carlos, Departamental I, Despacho 213, C/ Tulipán s/n, 28933 Móstoles, Madrid, Spain
3Israel Oceanographic & Limnological Research Ltd., The National Institute of Oceanography, PO Box 8030, Haifa 31080, Israel
4Israel Oceanographic & Limnological Research Ltd., National Center for Mariculture, PO Box 1212, Eilat 88112, Israel
5ALGAE–Marine Plant Ecology Research Group, CCMAR, Universidade do Algarve, Gambelas, 8005-139 Faro, Portugal
6Department of Biology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
7School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia
8Institute for Biosciences, Aquatic Ecology, University of Rostock, Albert-Einstein-Str. 3, 18059 Rostock, Germany

ABSTRACT: Thallus absorptance, daily courses of maximal quantum yields of chlorophyll fluorescence of photosystem II (Fv/Fm) and electron transport rates (ETR) were determined in 3 macroalgae (Hypnea spinella, Rhodophyta; Sargassum vulgare, Phaeophyta; and Ulva lactuca, Chlorophyta) collected from a low nutrient supply (LNS) ecosystem (Red Sea, Gulf of Aqaba, Eilat, Israel). In addition, U. lactuca grown previously in high nutrient supply (HNS) fishpond effluents was used to evaluate the effect of nutrient enrichment on photosynthesis. Short-term (2 d) and mid-term (5 d) effects of both photosynthetically active radiation (PAR) and full solar irradiance (PAB: PAR+UVA+UVB) at 3 solar irradiance treatments (no neutral filters, no NF; 2 neutral filter layers, 2NF; and 4 neutral filter layers, 4NF simulating levels of irradiance at 5, 10 and 20 m depth respectively) were evaluated in algae incubated with running seawater. Significant effects of time (variation throughout the day) and irradiance (number of neutral filters) on both Fv/Fm and ETR were observed. Photoinhibition occurred at noon under the no NF (up to 40% decrease) and 2NF (up to 30% decrease) treatments; however, full recovery in all treatments was reached in the afternoon (dynamic photoinhibition) except in H. spinella. The highest maximum ETR was observed in the no NF treatment despite its strongest photoinhibitory effect. The decrease in Fv/Fm at noon was similar to or higher under the PAB than under the PAR treatment alone, depending on the species. Photoinhibition was lower and the maximum ETR was higher in HNS than in LNS U. lactuca, indicating positive effects of nutrient supply on both photosynthesis and photoprotection. The maximum ETRs exhibited by different algae may be related to their zonation in the field and the resulting energy supply.

KEY WORDS: Chlorophyll fluorescence · Hypnea spinella · Macroalgae · Nutrient supply · Red Sea · Sargassum vulgare · Thallus absorptance · Ulva lactuca

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Cite this article as: Figueroa FL, Martínez B, Israel A, Neori A and others (2009) Acclimation of Red Sea macroalgae to solar radiation: photosynthesis and thallus absorptance. Aquat Biol 7:159-172. https://doi.org/10.3354/ab00186

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