Phosphate uptake from phosphomonoesters by phytoplankton in the Chesapeake Bay1

Taft, Jay L.; Loftus, M. E.; Taylor, W. Rowland

doi:10.4319/lo.1977.22.6.1012

Cited by 89 publications

(54 citation statements)

References 3 publications

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“…Rivkin and Swift (1979) have documented that phosphatase can be produced by a marine dinoflagellate. Phosphatase activity has also been observed in other marine phytoplankton (Taft et al, 1977). In addition, we have observed phosphatase activity in several species of bryozoans (unpubl.…”

Section: Relative Microbial Activitysupporting

confidence: 57%

Microbial Processes Relating to Carbon Cycling in Southeastern Bering Sea Sediments

Griffiths¹,

Caldwell²,

Broich³

et al. 1983

Mar. Ecol. Prog. Ser.

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Several microbial variables were measured in southeastern Bering Sea sediments which should theoretically be related to carbon cycling. The variables studied included glutamate and glucose uptake and respiration rates, CO, and methane production rates and the activities of the following hydrolases: cellulase, amylase, laminarinase, protease and xylanase. Nitrogen fixation (acetylene reduction) and denitrification rates, and phosphatase and arylsulfatase activities were also determined. The 2 regions studied were offshore sediments in the Saint George Basin (SGB) and inshore bay sediments in Port Moller (PM). Mean rates of all variables studied were higher in PM sediments when compared to SGB. The rates of methane production. CO, production, and nitrogen fixation were comparable to those reported in temperate marine sediments indicating that these rates were not depressed because of low temperature. In sediments of both areas, phosphatase and arylsulfatase activities were highly correlated. In PM, the activity of these 2 enzymes was highly correlated with protease activity, glutamate uptake rates, and CO, evolution rates. These correlations suggest that in PM sediments, all of these variables were interrelated and probably reflected relative levels of microbial heterotrophic activity. In the same sediments, the linear correlation between glutamate uptake rates and protease activity was very high (r = 0.993). This high correlation suggests that protease activity reflects amino acid availability to the microbial population as the result of protein hydrolysis. It also suggests that the glutamate uptake rates reflect the adjustment of the microbial population to levels of amino acids available in the sediments. There was a region within SGB where microbial processes were elevated during both sample periods (January and May). This area was located on an oceanographic frontal system. The high microbial activity observed there may be related to the influence of the frontal system on primary productivity and sedimentation processes.

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Section: Relative Microbial Activitysupporting

confidence: 57%

Microbial Processes Relating to Carbon Cycling in Southeastern Bering Sea Sediments

Griffiths¹,

Caldwell²,

Broich³

et al. 1983

Mar. Ecol. Prog. Ser.

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“…Therefore, the decrease in C : N ratio during the growth phase is a consequence of the storing of N. In the second phase this pool of N is consumed, but the main limiting compound is P. This view is supported by the fact that alkaline phosphatase activity increased considerably in the last part of the winter cycle (Hernandez et al 1993). Alkaline phosphatase activity has been shown to increase in response to P depletion in the external medium (Cenibella et al 1984) and to a decrease in the cellular P content (Taft et al 1977, Pettersson 1980). …”

mentioning

confidence: 97%

Seasonal cycle of the gametophytic form of Porphyra umbilicalis: nitrogen and carbon

Hernández¹,

Corzo²,

R³

et al. 1993

Mar. Ecol. Prog. Ser.

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Seasonal variations in environmental factors (irradiance, seawater concentration of NO,, NOp-and NH4+, temperature) and in physiological variables of Porphyra umbiljcalis (L.) Kiitzing (intracellular NOn-, NO2-and NH; concentrations, nitrate reductase activity, amino acids, soluble proteins, total C, total N, C:N:P ratio) were determined during winter 1991-92 at a site in Lagos (Malaga, southern coast of Spam). In the western Mediterranean Sea, the leafy thallus of P. urnbd~cahs occurs only during winter (mid-December to mid-March). Maximal % cover (80 %) was reached in the first part of February. Conditions of low temperature (14.7 _+ 0.6OC), short days (10 h daylight) and low global solar irradiance (2.5 to 3 4 kWh m-2) prevailed during the period of increase in ?/o cover. The period of decrease in % cover was characterized by long days (12 h), higher irradiance (3.4 to 5 kWh m-2), and slightly higher water temperature (15.5 f 1.34 "C). NO, concentration in seawater ([NO,],) at the study site ranged from 1 to 6.7 FM, [NOz-], was always lower than l pM, and [NH,'],, the largest source of inorganic nitrogen, ranged from 6.8 to 17.6 pM. Intracellular concentration of NO, ([NO,],) ranged from 2.8 to 51.3 mm01 1-' cell water (11.7 to 210.6 ymol g -' dry wt), which represents a concentration factor of up to 4.2 X 104 with respect to the seawater. [NO,-], ranged from 0.2 to 0.7 mm01 1-' cell water and [NH;], from 0.016 to 2.2 mm01 1-' cell water. Nitrate reductase (NR) activity varied widely during the winter cycle (between 1.2 and 9.4 pm01 NOp-g-' fresh wt h-'). It was found to be a very sensit.ive parameter for indicating when NOT is being used as the N source for growth. Therefore, low NR activity levels coincided with the highest [NO

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“…Ever since Strickland and Parsons (1968) recommended this method for seawater analysis, it has been widely used, as it is the only one in the literature (Taft et al 1977;Francko and Heath 1979;Rivkin and Swift 1979). In our studies of the role of APA in P mineralization processes in freshwaters we tried to apply this method to the determination of EHP in hypereutrophic Lake Glebokie .…”

mentioning

confidence: 99%

A method for determining enzymatically hydrolyzable phosphate (EHP) in natural waters1

Chróst

Siuda

Albrecht

et al. 1986

Limnology & Oceanography

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A method for determining enzymatically hydrolyzable phosphate (EHP) in natural waters is described, based on the determination of released inorganic phosphate after the hydrolysis of organophosphoric esters by free, dissolved phosphohydrolases (mainly phosphatase) produced by the biota. The method gives higher values in highly eutrophic waters than the classical procedure of Strickland and Parsons; in samples from less eutrophic habitats the two methods give similar results. The new method is simple, accurate, and can be used in both freshwater and marine studies. It is particularly recommended for determination in hypereutrophic waters, when Pi concentrations exceed 25 µg P liter−1. Representative field data from the euphotic zone of seven lakes and two marine habitats are presented.

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Phosphate uptake from phosphomonoesters by phytoplankton in the Chesapeake Bay1

Cited by 89 publications

References 3 publications

Microbial Processes Relating to Carbon Cycling in Southeastern Bering Sea Sediments

Microbial Processes Relating to Carbon Cycling in Southeastern Bering Sea Sediments

Seasonal cycle of the gametophytic form of Porphyra umbilicalis: nitrogen and carbon

A method for determining enzymatically hydrolyzable phosphate (EHP) in natural waters1

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