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Seasonal variations in photosynthetic irradiance response curves of macrophytes from a Mediterranean coastal lagoon
Plus, M.; Auby, I.; Verlaque, M.; Levavasseur, G. (2005). Seasonal variations in photosynthetic irradiance response curves of macrophytes from a Mediterranean coastal lagoon. Aquat. Bot. 81(2): 157-173. dx.doi.org/10.1016/j.aquabot.2004.10.004
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Coastal lagoons; Irradiance; Photosynthesis; Respiration; Response time; Seagrass; Seasonal variations; Chaetomorpha linum (O.F.Müller) Kützing, 1845 [WoRMS]; Dasya sessilis Yamada, 1928 [WoRMS]; Gracilaria bursa-pastoris (S.G.Gmelin) P.C.Silva, 1952 [WoRMS]; Monostroma obscurum (Kützing) J.Agardh, 1883 [WoRMS]; Zostera noltei Hornemann, 1832 [WoRMS]; Rytiphloea tinctoria (Clemente) C. Agardh, 1824 [WoRMS]; MED, France, Languedoc-Roussillon, Thau Lagoon [Marine Regions]; Marine

Authors  Top 
  • Plus, M.
  • Auby, I.
  • Verlaque, M.
  • Levavasseur, G.

Abstract
    The main photosynthesis and respiration parameters (dark respiration rate, light saturated production rate, saturation irradiance, photosynthetic efficiency) were measured on a total of 23 macrophytes of the Thau lagoon (2 Phanerogams, 5 Chlorophyceae, 10 Rhodophyceae and 6 Phaeophyceae). Those measurements were performed in vitro under controlled conditions, close to the natural ones, and at several seasons. Concomitantly, measurements of pigment concentrations, carbon, phosphorous and nitrogen contents in tissues were performed. Seasonal intra-specific variability of photosynthetic parameters was found very high, enlightening an important acclimatation capacity. The highest photosynthetic capacities were found for Chlorophyceae (e.g. Monostroma obscurum thalli at 17°C, 982 µmol O2 g-1 dw h-1 and 9.1 µmol O2 g-1 dw h-1 /µmol photons m-2 s-1, respectively for light saturated net production rate and photosynthetic efficiency) and Phanerogams (e.g. Nanozostera noltii leaves at 25°C, 583 µmol O2 g-1 dw h-1 and 2.6 µmol O2 g-1 dw h-1/µmol photons m-2 s-1 respectively for light saturated net production rate and photosynthetic efficiency). As expected, species with a high surface/volume ratio were found to be more productive than coarsely branched thalli and thick blades shaped species. Contrary to Rd (ranging 6.7-794 µmol O2 g-1 dw h-1/µ, respectively for Rytiphlaea tinctoria at 7°C and for Dasya sessilis at 25°C) for which a positive relationship with water temperature was found whatever the species studied, the evolution of P/I curves with temperature exhibited different responses amongst the species. The results allowed to show summer nitrogen limitation for some species (Gracilaria bursa-pastoris and Ulva spp.) and to propose temperature preferences based on the photosynthetic parameters for some others (N. noltii, Zostera marina, Chaetomorpha linum).

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