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in natural assemblages of marine phytoplankton.

Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton

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natural assemblages of marine phytoplankton.

During austral summer 2006, experiments were carried out to evaluate the effects of ultraviolet radiation (UVR, 280-400 nm) on carbon fixation of natural phytoplankton assemblages from Patagonia (Argentina). Surface water samples were collected (ca. 100 m offshore) at mid morning using an acid-cleaned (1 N HCl) dark container. The short-term impact of UVR (measured as radiocarbon incorporation) was immediately assessed by exposing samples to three artificial illumination treatments: PAR (400-700 nm), PAR + UV-A (320-700 nm), and PAR + UV-A + UV-B (280-700 nm). Pico-nanoplankton characterized the assemblages, and taxon-specific pigment fingerprinting combined with CHEMTAX and supplemented with microscopic observations showed varied proportions of diatoms, chlorophytes, and cyanobacteria throughout January-February 2006. Photosynthetic efficiency, as assessed through assimilation numbers, was high [between 4.4 and 10.4 mu g C (mu g chl-a)(-1) h(-1)], and it was probably favored by the supply of inorganic nutrients from the Chubut River. UVR-induced photoinhibition appeared to be related to the taxonomic composition: in general, higher photoinhibition was observed when diatoms dominated, whereas this was lower when samples were dominated by chlorophytes. Our data suggest that xanthophyll pigments might have provided only limited protection in these already highlighted acclimated assemblages.

Platt T., Gallegos C.L., Harrison W.G. 1980. Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton. J. Mar. Res. 38: 687-701.

in natural assemblages of marine phytoplankton

Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton. Journal of Marine Research 38, 687–701.

N2 - During austral summer 2006, experiments were carried out to evaluate the effects of ultraviolet radiation (UVR, 280-400 nm) on carbon fixation of natural phytoplankton assemblages from Patagonia (Argentina). Surface water samples were collected (ca. 100 m offshore) at mid morning using an acid-cleaned (1 N HCl) dark container. The short-term impact of UVR (measured as radiocarbon incorporation) was immediately assessed by exposing samples to three artificial illumination treatments: PAR (400-700 nm), PAR + UV-A (320-700 nm), and PAR + UV-A + UV-B (280-700 nm). Pico-nanoplankton characterized the assemblages, and taxon-specific pigment fingerprinting combined with CHEMTAX and supplemented with microscopic observations showed varied proportions of diatoms, chlorophytes, and cyanobacteria throughout January-February 2006. Photosynthetic efficiency, as assessed through assimilation numbers, was high [between 4.4 and 10.4 mu g C (mu g chl-a)(-1) h(-1)], and it was probably favored by the supply of inorganic nutrients from the Chubut River. UVR-induced photoinhibition appeared to be related to the taxonomic composition: in general, higher photoinhibition was observed when diatoms dominated, whereas this was lower when samples were dominated by chlorophytes. Our data suggest that xanthophyll pigments might have provided only limited protection in these already highlighted acclimated assemblages.

AB - During austral summer 2006, experiments were carried out to evaluate the effects of ultraviolet radiation (UVR, 280-400 nm) on carbon fixation of natural phytoplankton assemblages from Patagonia (Argentina). Surface water samples were collected (ca. 100 m offshore) at mid morning using an acid-cleaned (1 N HCl) dark container. The short-term impact of UVR (measured as radiocarbon incorporation) was immediately assessed by exposing samples to three artificial illumination treatments: PAR (400-700 nm), PAR + UV-A (320-700 nm), and PAR + UV-A + UV-B (280-700 nm). Pico-nanoplankton characterized the assemblages, and taxon-specific pigment fingerprinting combined with CHEMTAX and supplemented with microscopic observations showed varied proportions of diatoms, chlorophytes, and cyanobacteria throughout January-February 2006. Photosynthetic efficiency, as assessed through assimilation numbers, was high [between 4.4 and 10.4 mu g C (mu g chl-a)(-1) h(-1)], and it was probably favored by the supply of inorganic nutrients from the Chubut River. UVR-induced photoinhibition appeared to be related to the taxonomic composition: in general, higher photoinhibition was observed when diatoms dominated, whereas this was lower when samples were dominated by chlorophytes. Our data suggest that xanthophyll pigments might have provided only limited protection in these already highlighted acclimated assemblages.

natural assemblages of marine phytoplankton ..

Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton

Harding L.W., Prezelin B.B., Sweeney B.M., et al. 1982. Diel oscillations of the photosynthesis–irradiance (PI) relationship in natural assemblages of phytoplankton. Mar. Biol. 67: 167-178.

Surface irradiance levels which could potentially support phytoplankton growth. photoinhibition; ol = initial slope of the P-l curve mg C. mg ch1-' h-' PE m-' S-'-';. tion of photosynthesis in natural assemblages of marine phytoplankton. A series of mesocosm studies were conducted using natural phytoplankton communities isolated from. photosynthesis in the absence of photoinhibition µgC µg. photosynthesis in natural assemblages of marine phytoplankton. J. Mar.

Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton.
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Spain. Key words light, photosynthetic parameters, nutrients, estuary, Spain. ABSTRACT. of photosynthesis in natural phytoplankton assemblages COTE and PLATT. Variations in the assimilation number of coastal marine phytoplankton Effects. Photoinhibition of photosynthesis in natural assemblages of marine. Oct 15, 1980. Periodicity in phytoplankton photosynthesis on light-dark cycles diel. Photoinhibition of photosynthesis in natural assemblages of marine.

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Jun 8, 1976. ASSEMBLAGES OF COASTAL MARINE PHYTOPLANKTON1. Trevor Platt and Alan. tion curve for natural assemblages of phytoplankton at 3 stations in Nova. than the threshold of photoinhibition, a sufficient mathematical. Analyses of some 700 photosynthesis-irradiance P-I experiments made on natural marine phytoplankton assemblages in over six years of field work are. An exhaustive review of photoinhibition in phytoplankton and its significance for aquatic. of photosynthesis in natural assemblages of marine phytoplankton.

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In contrast to previous results on UV-induced photoinhibition in a diatom culture at 20°C natural phytoplankton from open waters of the Antarctic showed no ability to counter UV-induced inhibition of photosynthesis during exposures of 0.5-4 h: the rate of photosynthesis declined exponentially as a function of cumulative exposure, and inhibition was not reversed during incubations for up to 3.5 h under benign conditions.

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