Inorganic Carbon Requirements of Natural Populations and Laboratory Cultures of Some Chesapeake Bay Phytoplankton

Loftus, M. E.; Place, Allen R.; Seliger, H. H.

doi:10.2307/1351570

Cited by 12 publications

(8 citation statements)

References 27 publications

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“…It is also possible that a difference in dinoflagellate physiology with salinity was responsible. In the Chesapeake Bay, carbon fixation can be limited by inorganic carbon during blooms, particularly at low salinity (Loftus et al 1979). Uptake of organic carbon should be particularly advantageous under these conditions.…”

Section: Discussionmentioning

confidence: 99%

Cell-surface proteolytic activity of photosynthetic dinoflagellates

Stoecker

Gustafson²

2003

Aquat. Microb. Ecol.

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Section: Discussionmentioning

confidence: 99%

Cell-surface proteolytic activity of photosynthetic dinoflagellates

Stoecker

Gustafson²

2003

Aquat. Microb. Ecol.

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“…Dependence of P B max on temperature and dissolved inorganic carbon (Loftus et al 1979, Falkowski & Raven 2007 drive the winter minimum and summer maximum of that parameter (Gallegos 2012a); however, much short-term variability also occurs in P B max that is not well predicted by the available data, including species composition. Moreover, the low phytoplankton biomass and persistence of available dissolved inorganic nitrogen during winter (Jordan et al 1991a) result from physiological limitation of phytoplankton growth by low temperature and incident light .…”

Section: Seasonal Variabilitymentioning

confidence: 98%

Long-term variations in primary production in a eutrophic sub-estuary. I. Seasonal and spatial patterns

Gallegos¹

2014

Mar. Ecol. Prog. Ser.

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Daily rates of phytoplankton primary production were calculated from measurements of light saturation curves of photosynthesis for 20 yr at 6 stations on the Rhode River, Maryland (USA). Daily production, corrected for the geometry and spectrum of the underwater light field, averaged 1319 (range 1.4 to 15 800) mg C m. Log-transformation of the exact solution for depthintegrated daily production permitted linear analysis of seasonal and spatial patterns in production and the factors that determine it. The seasonal signal was the greatest source of variation, followed by spatial then interannual. The seasonal pattern was driven by coinciding summer maxima in both the chlorophyll a (chl a) biomass, B, and the light saturated photosynthetic rate normalized to chl a, P B max . The spatial pattern was characterized by a region in which production was relatively constant despite declining depth, a station at which production was reduced by truncation of the depth profile of production, and an area where mean production was lowest but variance was highest, due to local flow causing either localized blooms or washout of biomass and high turbidity at the station furthest up the estuary. Analysis of the components contributing to the variance in production indicated that variance in B and P B max added nearly equally to it. Covariance between B and the light attenuation coefficient reduced the variance in production. The analytical approach adopted here allowed these patterns to be discerned against a high degree of overall variability, and should be similarly useful in a wide range of systems.

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“…There is precedence for the finding that IC was a significant predictor of P B max in the Rhode River. Loftus et al (1979) measured the IC saturation kinetics of natural populations from the Rhode River on 6 occasions and found that the half-saturation constant, K c , averaged 0.55 (range 0.29 to 0.77) mM C (average 6.65 and range 3.48 to 9.24 mg C l −1 ). They found that addition of IC as bicarbonate to incubation bottles stimulated 14 C uptake by up to 2.5-fold (Loftus et al 1979).…”

Section: Environmental Covariatesmentioning

confidence: 99%

“…Loftus et al (1979) measured the IC saturation kinetics of natural populations from the Rhode River on 6 occasions and found that the half-saturation constant, K c , averaged 0.55 (range 0.29 to 0.77) mM C (average 6.65 and range 3.48 to 9.24 mg C l −1 ). They found that addition of IC as bicarbonate to incubation bottles stimulated 14 C uptake by up to 2.5-fold (Loftus et al 1979). For IC concentrations ranging from 1.4 to 26 mg C l −1 in the measurements reported here, the factor expressing the limitation of photosynthesis by IC, IC/(K C +IC), would have a typical value of 0.68 (dimensionless) and could be as low as 0.13.…”

Section: Environmental Covariatesmentioning

confidence: 99%

Phytoplankton photosynthetic capacity in a shallow estuary: environmental correlates and interannual variation

Gallegos¹

2012

Mar. Ecol. Prog. Ser.

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Parameters in the photosynthesis−irradiance (P-E) relationship of phytoplankton were measured at weekly to bi-weekly intervals for 20 yr at 6 stations on the Rhode River, Maryland (USA). Variability in the light-saturated photosynthetic rate, P B max , was partitioned into interannual, seasonal, and spatial components. The seasonal component of the variance was greatest, followed by interannual and then spatial. Physiological models of P B max based on balanced growth or photoacclimation predicted the overall mean and most of the range, but not individual observations, and failed to capture important features of the seasonal and interannual variability. P B max correlated most strongly with temperature and the concentration of dissolved inorganic carbon (IC), with lesser correlations with chlorophyll a, diffuse attenuation coefficient, and a principal component of the species composition. In statistical models, temperature and IC correlated best with the seasonal pattern, but temperature peaked in late July, out of phase with P B max , which peaked in September, coincident with the maximum in monthly averaged IC concentration. In contrast with the seasonal pattern, temperature did not contribute to interannual variation, which instead was governed by IC and the additional lesser correlates. Spatial variation was relatively weak and uncorrelated with ancillary measurements. The results demonstrate that both the overall distribution of P B max and its relationship with environmental correlates may vary from year to year. Coefficients in empirical statistical models became stable after including 7 to 10 yr of data. The main correlates of P B max are amenable to automated monitoring, so that future estimates of primary production might be made without labor-intensive incubations.KEY WORDS: Phytoplankton · Photosynthesis · Primary production · Estuary · Rhode River · Interannual variability Resale or republication not permitted without written consent of the publisher

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Inorganic Carbon Requirements of Natural Populations and Laboratory Cultures of Some Chesapeake Bay Phytoplankton

Cited by 12 publications

References 27 publications

Cell-surface proteolytic activity of photosynthetic dinoflagellates

Cell-surface proteolytic activity of photosynthetic dinoflagellates

Long-term variations in primary production in a eutrophic sub-estuary. I. Seasonal and spatial patterns

Phytoplankton photosynthetic capacity in a shallow estuary: environmental correlates and interannual variation

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