Arctic marine photoautotrophic picoplankton

Smith, J. C.; Piatt, T.; Li, Wkw; Home, Epw; Harrison, W. G.; Rao, DV Subba; Irwin, B.

doi:10.3354/meps020207

Cited by 47 publications

(32 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This < 1 pm fraction differs somewhat from the definition of picoplankton (2 to 0.2 km fraction) given by Sieburth et al (1978) but has proven operationally convenient in dealing with the 100 to 500 m1 sample volumes typically used in physiological studies. It was particularly important not to fractionate samples for photosynthetic capacity determinations prior to incubation since we have shown (Smith et al 1985) that this selectively disrupts certain photosythetic processes; the enzyme and chlorophyll determinations do not appear to be affected, however.…”

Section: Sampling Locations and Methods Observations Onmentioning

confidence: 99%

“…Assay methods for RuBPC are described in Smith et al ( , 1985 and Li et al (1984). RuBPC activity was measured radiometrically by determining the rate of RuBP-dependent fixation of 14C02 into acid stable products in a quasi in vivo assay utilizing cells permeabilized by treatment with glycerol (Syrett 1973) and L-a-lysophosphatidylcholine (Miller et al 1978).…”

Section: Sampling Locations and Methods Observations Onmentioning

confidence: 99%

See 1 more Smart Citation

Temperature responses of ribulose bisphosphate carboxylase and photosynthetic capacity in arctic and tropical phytoplankton

Smith¹,

Piatt²

1985

Mar. Ecol. Prog. Ser.

Self Cite

View full text Add to dashboard Cite

When assayed near respective in situ temperatures, ribulose blsphosphate carboxylase (RuBPC) exhibits a greater response to increasing temperature in arctic than in tropical phytoplankton. This was also true when the Arrhen~us activation energy (E,) was compared for a range of intermediate temperatures. This difference in temperature response and E, for RuBPC is consistent with the temperature response of photosynthetic capacity, but is contrary to the general observation that coldenvironment ectotherms (organisms whose internal temperature conforms to that of the environment) have physiological processes with lower E,'s. Analysis suggests that the genotypic adaptation of qualititative enzyme temperature responses in marine phytoplankton is related to the vertical structure of the environment and to a suite of variables of which temperature is only one. Quantitatively, however, arctic phytoplankton do not appear to adapt to cold by increasing RuBPC levels per unit pigment biomass.

show abstract

Section: Sampling Locations and Methods Observations Onmentioning

confidence: 99%

Section: Sampling Locations and Methods Observations Onmentioning

confidence: 99%

Temperature responses of ribulose bisphosphate carboxylase and photosynthetic capacity in arctic and tropical phytoplankton

Smith¹,

Piatt²

1985

Mar. Ecol. Prog. Ser.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Lorimer 1981, Yoeh et al 1981, Miziorko & Lorimer 1983, Akazawa et al 1984, Kobza & Seemann 1988, but not in microalgae (Estep et al 1978, Appleby et al 1980, Hobson et al 1985, Plumley et al 1986, Newman & Cattolico 1987. Despite the obvious biochemical and physiological importance of RuBPCase, there have been surprisingly few systematic studies on the relationships between RuBPCase, or the 8-carboxylating Li et al 1984, Smith & Platt 1985, Mortain-Bertrand e~ al. 1987.…”

Section: Introductionmentioning

confidence: 99%

Photoadaptation in marine phytoplankton: variations in ribulose 1,5-bisphos-phate activity

Rivkin¹

1990

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

The rates of photosynthesis and the activity of ribulose 1,5-bisphosphate carboxylase (RuBPCase) were concurrently measured for phytoplankton in laboratory cultures and isolated from natural populatlons. Both photosynthetic capacity (Pmax) and RuBPCase activity were greater for phytoplankton adapted to high than low irradiances. Using single-species radioisotope techniques, the irradiance-dependent rates of photosynthesis and the RuBPCase activity of Ditylurn brightwellii and Ceratium lineatum, 2 common coastal phytoplankton, were measured at a Chesapeake Bay, USA, plume front. The photosynthetic characteristics and RuBPCase were clearly dependent on the photic regime. The species-specific Pmax and RuBPCase activity was similar for phytoplankton isolated throughout the water column on the well-mixed, oceanic slde of the front and wlthin the surface mixedlayer on the stratified, estuarine side of the front. In contrast, these photosynthetic parameters were significantly lower for the same species isolated from below the pycnocline upstream of the frontal interface. Changes in RuBPCase correlated (p = 0.01) wlth those in Pmax; for light-limited and -saturated phytoplankton in culture and from natural populations, the relationship was linear and significant. The coordinate pairs of Pmax and RuBPCase from all the laboratory and field, i.e. all stations and depths, experiments were fit to the linear regression (n = 84) RuBPCase = -1.686(f 7.675) + 0.677 Pmax(2 0.043); r2 = 0 872. Variations in Pmax are commonly used to describe the photoadaptations of phytoplankton from different photic regimes. The results of this study suggest that the temporal and spatial variations in RuBPCase may be a useful photoadaptive parameter for phytoplankton in nature.

show abstract

“…1985;Joint et al 1986). The contribution picophytoplankton makes to primary production varies from 60 or 80% in tropical waters (Li et al 1983;Platt et al 1983) to 20% or less in temperate and arctic waters (Joint & Pomroy 1983;Douglas 1984;Smith et al 1985). A comprehensive review on algal picoplankton in both marine and freshwater environments has recently been published by Slockncr & Antia (1986).…”

Section: Introductionmentioning

confidence: 99%

“…Box 260, DK-4000 Roskilde, Denmark Received 9 November 1987;accepted 16 May 1988 through a filter of 2 fim pore size. Marine photosynthetic picoplankton has received recognition as an important primary producer in the oceans only in recent years (Li et al 1983;Platt et al 1983;Smith et al 1985;Glover et al 1986;Joint et al 1986).…”

Section: Introductionmentioning

confidence: 99%

Picophytoplankton in the Hauraki Gulf, New Zealand

Booth

S⊘ndergaard

1989

New Zealand Journal of Marine and Freshwater Research

View full text Add to dashboard Cite

Qualitative and quantitative data for picophytoplankton from the Hauraki Gulf, northeast New Zealand, were gathered from May 1986 to February 1987. Records for both whole and sizefractionated samples (net-, nano-, and picophytoplankton) allowed the relative contribution by the picophytoplankton to total biomass and overall rates of carbon fixation to be estimated. Picophytoplankton represented a mean value of over 30% of the total chlorophyll a in winter and c. 20% in other seasons. In terms of total carbon fixation, values of 23% and 13% contribution were obtained. The picophytoplankton were composed of chroococcoid cyanobacterial cells, 0.7-1.2 µm in diameter, at densities between 10 3 and 10 4 ml -1 together with larger (1-2 µm) eukaryote cells at densities up to 10 3 ml -1 . Winter counts were lower than those for summer. Cyanobacteria displayed subsurface peak densities higher in the water column than the eukaryotes. The cyanobacterial cells at depth tended to be larger and more brightly fluorescing than those in the surface waters.

show abstract

Arctic marine photoautotrophic picoplankton

Cited by 47 publications

References 35 publications

Temperature responses of ribulose bisphosphate carboxylase and photosynthetic capacity in arctic and tropical phytoplankton

Temperature responses of ribulose bisphosphate carboxylase and photosynthetic capacity in arctic and tropical phytoplankton

Photoadaptation in marine phytoplankton: variations in ribulose 1,5-bisphos-phate activity

Picophytoplankton in the Hauraki Gulf, New Zealand

Contact Info

Product

Resources

About