Effect of irradiance on the physiology and ultrastructure of the marine cryptomonad, Cryptomonas strain Lis (Cryptophyceae)

Thinh, Luong-Van

doi:10.2216/i0031-8884-22-1-7.1

Cited by 22 publications

(17 citation statements)

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“…The increase in the chlorophyll content with decreasing photon flux density shown by all the species studied is an adaptation to the decreasing light s u p ply that is commonly observed in algae (Reynolds 1984). In culture experiments with a marine species of Cryptomonas, Thinh (1983) showed that the chlorophyll content of cells growing at 10 pmol.m-z.s-l was twice as high as that of cells growing at 260 pmol-m-'-s -I . The Cryptomonas species studied by Ojala (1993a) at a wide range of photon flux densities and temperatures acclimated to a reduced photon flux density by increasing their relative chlorophyll content maximally by a factor of 13 and 11, respectively.…”

Section: Discussionmentioning

confidence: 99%

Light‐dependent Growth, Dark Survival, and Glucose Uptake by Cryptophytes Isolated From a Freshwater Chemocline

Gervais

1997

Journal of Phycology

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Clones of Cryptomonas phaseolus Skuja, Cryptomonas rostratiformis (Skuja) Skuja in Huber-Pestalozi, and Cryptomonas undulata Geruais were isolated from the deep chlorophyll maximum near the oxic/anoxic bounda7y layer of the mesoeutrophic lake Schlachtensee, Germany. Different autecologzcal features of these species were studied in batch culture experiments. Cryptomonas cf: ovata Ehrenberg and Chroomonas sf. that never dominated in the deep chlorophyll layer were also isolated from Schlachtensee to study their light-dependent growth in comparison to the deep-living species. Cryptomonas undulata, C. # ovata, and C. phaseolus had a very low light compensation point (5-7 pmol.m-2.s-1), whereas the growth rate of Chroomonas sp. and C . rostratiformis was positive above 16 and 24 pmol.m-2.s-1. Cryptomonas phaseclus and Chroomonas sp. became photoinhibited above photon jlux densities of 92 and 11 6 pmol.m-2.s-1. Cryp tomonas rostratiformis, C. CJ: ovata, and C. undulata reached a maximum growth rate at a considerably higher photon jlux density ( 1 98-250 pmol.m-2.s-1). Cryptomonas phaseolus grew fastest under light-limiting conditions. Chyptomonas phaseolus and C. undulata were best able to suruive prolonged periods of darkness. Cryptomonas phaseolus, C. rostratiformis, and C. undulata did not show any uptake of fluorescent latex beads. When labeled glucose was provided in naturally occurring concentrations, carbon uptake by C. phaseolus, C. rostratiformis, and C. undulata was negligzbly small in comparison to cellular carbon content. I suggest that the adaptation to a low-light environment is an important preadaptation for the dominance ofC. phaseolus and C. undulata near the freshwater chemocline.

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Section: Discussionmentioning

confidence: 99%

Light‐dependent Growth, Dark Survival, and Glucose Uptake by Cryptophytes Isolated From a Freshwater Chemocline

Gervais

1997

Journal of Phycology

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“…1 mm), which were pooled by depth, homogenised and sonicated (30 s at 15 W). Phycobiliproteins were extracted in 2 ml phosphate buffer (0.2 M, pH = 6.5) and left overnight at 4°C in darkness (Thinh 1983). Chlorophyll a was extracted in 2 ml 100% methanol (Thompson et al 1999) and left overnight at 4°C in darkness.…”

Section: Methodsmentioning

confidence: 99%

Biogeochemical effects of macroalgal decomposition on intertidal microbenthos: a microcosm experiment

García‐Robledo¹,

Corzo

Lomas³

et al. 2008

Mar. Ecol. Prog. Ser.

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The decomposition of macroalgal detritus (tubular and planar Ulva spp.) was studied in a microcosm under a daily light:dark cycle to simulate the decomposition on intertidal sediment. The consequences of bloom decay were evaluated in the bulk water phase and in the sediment. ), dissolved organic carbon (DOC) and inorganic carbon (DIC) were measured in the inflowing and outflowing seawater. Vertical microprofiles of O 2 , pH and H 2 S at the sediment -water interface, sediment contents of organic matter (OM), inorganic and organic carbon (C org ), total nitrogen (N) and inorganic nutrients were measured before and after addition of macroalgal detritus. Changes in the taxonomic composition of microphytobenthos were studied by optical microscopy and by the analysis of photosynthetic pigments. Macroalgal detritus vanished from the sediment surface in 6 d. Macroalgal decomposition shifted the microcosm net balance to higher releases of DOC, DIC and inorganic nutrients, suggesting rapid release from macroalgal biomass. Besides being released to the water column, a fraction of macroalgal carbon and of nitrogen was incorporated into the sediment as indicated by a transient increase in C org and N. Aerobic mineralization of macroalgal detritus reduced O 2 in the water column and the sediment. Microbenthos photosynthetic activity was initially suppressed but recovered from the third day as macroalgal detritus decomposed. Photosynthetic O 2 production by microbenthos largely determined the fraction of macroalgal detritus that was aerobically mineralised. Decomposition of macroalgal detritus favoured the dominance of cyanobacteria over diatoms in the microbenthos. KEY WORDS: Macroalgal blooms · Microbenthos · Microelectrodes · Macroalgal decomposition · Macroalgal detritusResale or republication not permitted without written consent of the publisher

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“…Santore 1977, Klaveness 1981), pigmentation (e.g. MacColl et al 1976, Thinh 1983, as well as systematics and phylogeny (Klaveness 1985) have been extensively studied, a photosynthetic characterisation of Cryptophyceae exists only for very few species (Cryptomonas lis, Thinh 1983Thinh , 1988C. obavata, Giroldo & Vieira 1999).…”

Section: Introductionmentioning

confidence: 99%

“…obavata, Giroldo & Vieira 1999). To our knowledge E k , a useful index of acclimation to different light conditions (Talling 1957, Henley & Ramus 1989, has been calculated only for C. lis (Thinh 1983(Thinh , 1988. Therefore, information on cryptophyte photoacclimation kinetics is needed to clarify whether or not special features in light utilisation capabilities are responsible for the observed winter dominance of cryptophytes.…”

Section: Introductionmentioning

confidence: 99%

Light and temperature acclimation of Rhodomonas salina (Cryptophyceae): photosynthetic performance

Hammer¹,

Schumann²,

Schubert³

2002

Aquat. Microb. Ecol.

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Effect of irradiance on the physiology and ultrastructure of the marine cryptomonad, Cryptomonas strain Lis (Cryptophyceae)

Cited by 22 publications

References 0 publications

Light‐dependent Growth, Dark Survival, and Glucose Uptake by Cryptophytes Isolated From a Freshwater Chemocline

Light‐dependent Growth, Dark Survival, and Glucose Uptake by Cryptophytes Isolated From a Freshwater Chemocline

Biogeochemical effects of macroalgal decomposition on intertidal microbenthos: a microcosm experiment

Light and temperature acclimation of Rhodomonas salina (Cryptophyceae): photosynthetic performance

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