Depth distribution of photosynthetic activity in a Myriophyllum, spicatum community in Lake Wingra1

Adams, Michael S.; Titus, John E.; McCracken, Michael D.

doi:10.4319/lo.1974.19.3.0377

Cited by 54 publications

(23 citation statements)

References 20 publications

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“…To determine initial and final total DIC content, we injected 1.0 ml of the water into 5 ml of 1 N HCl through which an N, airstream bubbled and stripped the CO, for analysis by a Beckman 215B infrared gas analyzer. od (Adams et al 1974) for incubation periods of 0.75-1.5 h only by the direct determination of total DIC as described above. Total DIC determined directly with the gas analyzer was not identical to but was well correlated with DIC calculated from pH and alkalinity (r = 0.99 from linear regression: Titus 1977).…”

Section: Methodsmentioning

confidence: 99%

Photosynthetic response of two submersed macrophytes to dissolved inorganic carbon concentration and pH1

Titus

Stone

1982

Limnology & Oceanography

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The photosynthetic responses of Myriophyllum spicatum and Vallisneria americana to total dissolved inorganic carbon (DIC) concentration (pH 8.0; 25°C; saturating light) indicate that both species are sensitive to changes in DIC concentrations at natural lake levels, and that M. spicatum has a somewhat lower half-saturation constant than V. americana for that relationship.This difference is probably not ecologically significant. Carbon uptake rates of V. americana decline by 61% from pH 7 to 8, but change little from pH 8 to 9, whereas those of M. spicatum decline by 35% from pH 7 to 8 and by a further 58% from pH 8 to 9. These decreases do not parallel the corresponding decline in free CO, availability over this pH range. Carbon compensation points expressed as total DIC, free COz, or the atmospheric CO2 concentration in equilibrium with the corresponding free CO2 level are strongly pH-dependent and do not differ substantially between M. spicatum and V. americana.Submersed macrophytes, unlike emergent or floating-leaved macrophytes, are entirely dependent on the availability of dissolved inorganic carbon for photosynthesis. Literature summarized by Sculthorpe (1967) and Raven (1970) has suggested that the absorption of dissolved inorganic carbon (DIC) is a major problem facing a submersed photosynthetic organ, partly because rates of gas diffusion in solution may be five orders of magnitude slower than in air. Furthermore, the DIC system of alkaline lakes consists of several forms which are not equally available as photosynthetic carbon sources. Carbonic acid dissociates to form significant quantities of HC03-and C03+, and the proportion of free CO, declines rapidly as pH rises from 4.5. Photosynthesis is generally more rapid with free CO, than with the equivalent concentration of HC03-, and COs2-does not

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Section: Methodsmentioning

confidence: 99%

Photosynthetic response of two submersed macrophytes to dissolved inorganic carbon concentration and pH1

Titus

Stone

1982

Limnology & Oceanography

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“…Subsamples (ca. 10 mg) were combusted in pure oxygen and the evolved mixture of [14C]C0, and CO, trapped by sparging with N, through ethanolamine (Adams et al 1974). Portions (0.2 ml) of the cthanolamine containing entrapped 14C were pipetted into vials with liquid scintillation solution (Bray 1960) and counted in a scintillation counter (Traccrlab).…”

Section: Mnterials and Methodsmentioning

confidence: 99%

Relationship of dissolved inorganic carbon to macrophyte photosynthesis in some Italian lakes1

Adams¹,

Guilizzoni²,

Adams³

1978

Limnology & Oceanography

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DEB75-19777 to the University of Wisconsin. tus 1977). Since there is a pH effect on the proportion of DIC fractions (CO,, IICOn-, and COn2-) at equilibrium, the differential capability to use HC03-may be observed in the pH effect on inorganic carbon fixation. Titus (1977) found that photosynthesis of V. americana at a DIC level of 110 mg C02-litcr-1 clecreases sevcrely when pH changes from 7 to 8, while that of M. spicatunx decreases most between pII 8 and 9.Titus used buffcrcd water and adjusted DIC levels to determine the effect of DIC on photosynthesis of M. spicatum. In experirnents at pH 8 and five different levels of DIC between about 30 and 250 mg CO,.liter-I, he fit the data with nonlinear regression to the Michaelis-Menten relationship V = V,,,(DIC/k, + DIC) and found a k, value of 92 mg CO, * liter-'; i.e. photosynthesis (as measured by 14C fixation)would be half-saturated with DIC at a DIC level of 92 mg CO,* liter-', at pH 8.The experiments of Titus were conducted in the laboratory and we became interested in examining the hypothesis that results similar to his would be found for M. spicatum in different lake waters in which the DIC naturally ranges from low to high levels. In northern Italy several lakes contain M. spicatum and range 912

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“…commun.). Several morphological and physiological strategies, such as canopy building [8], nutrient removal from open water [9], heavy vegetative spread by autofragmentation and low light-and CO2-compensation points I-5] are proposed for its highly competitive strength. Allelopathically active phenolic compounds from this macrophyte were thought to be involved in the interaction with cyanobacteria and chlorophytes 1-101 but until now no active compound had been identified.…”

Section: Eurasian Watermilfoil (Myriophyllum Spicatum Lmentioning

confidence: 99%

Release and ecological impact of algicidal hydrolysable polyphenols in Myriophyllum spicatum

Meyer²,

1996

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Abstract--Aqueous acetone extracts of shoots of Eurasian watermilfoil (Myriophyllum spicatum) exhibit a strong inhibitory action against various coccoid and filamentous cyanobacteria and to a slightly less extent against chlorophytes and diatoms. Bioassay-directed fractionation led to the isolation of a hydrolysable polyphenol, tellimagrandin II, which turned out to be the main inhibitory substance. Myriophyllum spicatum contains large amounts of this compound (1.5 % of dry wt). Part of the inhibitory activity is due to complexation and inactivation of algal extracellular enzymes (e.g. alkaline phosphatase) by hydrolysable polyphenols from M. spicatum.

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Depth distribution of photosynthetic activity in a Myriophyllum, spicatum community in Lake Wingra1

Abstract: Photosynthetic rates and productivity of Myriophyllum spicatum L. were examined in the littoral by incubating shoot sections at three rooting depths using a 14C technique.

Cited by 54 publications

References 20 publications

Photosynthetic response of two submersed macrophytes to dissolved inorganic carbon concentration and pH1

Photosynthetic response of two submersed macrophytes to dissolved inorganic carbon concentration and pH1

Relationship of dissolved inorganic carbon to macrophyte photosynthesis in some Italian lakes1

Release and ecological impact of algicidal hydrolysable polyphenols in Myriophyllum spicatum

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