A comparative study of the effect of pH and inorganic carbon resources on the photosynthesis of three floating macroalgae species of a Mediterranean coastal lagoon

Menéndez, M.; Martínez, Marc Lafuente; Comı́n, Francisco A.

doi:10.1016/s0022-0981(00)00313-0

Cited by 62 publications

(32 citation statements)

References 28 publications

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“…The authors also considered that seaweeds are drastically affected by high temperatures in part of the spring and in the summer. Thermal damage could lead to the loss of tissue and nutrients to the environment (Hanisak, 1993;Menéndez et al, 2001). Typical summer temperatures in Guanabara Bay (>25 • C, data not shown) could potentially result in tissue loss.…”

Section: Discussionmentioning

confidence: 98%

Tissue Nitrogen and Phosphorus in Seaweeds in a Tropical Eutrophic Environment: What a Long-Term Study Tells Us

et al. 2006

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Percentages of nitrogen and phosphorus in 10 species of seaweeds (6 green and 4 red algae) were monitored from 1997 to 2004 by seasonal sampling in Guanabara Bay, South-eastern Brazil. The species did not show consistent variations in tissue N, P and N:P that related to annual cycles. Throughout this study, higher percentages of tissue N and P were found in Bostrychia radicans and Grateloupia doryphora (red algae) and lower in Cladophora rupestris and Codium decorticatum (green algae). In November 1999, the Icaraí Submarine Sewage Outfall became operational, resulting in a reduction of visual pollution in the area and an improvement in the local quality of seawater for recreational use. Measurements of dissolved nutrients at the sampling site did not indicate significant changes in concentrations after the commissioning of the submarine sewage outfall; however, tissue P and N:P ratio of most of species were significantly lower than in the first two years of this survey. Variations in tissue nitrogen throughout this study were not significant, except for G. doryphora in some comparisons. Results show that seaweeds function very well as monitors of environmental changes in Guanabara Bay. Experimental data are needed to identify possible environmental processes which are promoting changes in chemical composition of the local seaweed populations.

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Section: Discussionmentioning

confidence: 98%

Tissue Nitrogen and Phosphorus in Seaweeds in a Tropical Eutrophic Environment: What a Long-Term Study Tells Us

et al. 2006

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“…Red macroalgae are especially efficient at taking up nutrients rapidly and, unlike Ulvaceans, have mechanisms to store large reserves of nitrogen (Jones et al, 2001;Menéndez et al, 2001;Hernández et al, 2006) in the red pigment phycoerythrin which in conditions of nutrient deficiency is quickly mobilized and used to sustain growth (Nagler et al, 2003;Hernández et al, 2006). This ability can constitute a competitive advantage over green macroalgae during periods of low nitrogen availability (Comín et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

The response of primary producer assemblages to mitigation measures to reduce eutrophication in a temperate estuary

Leston

Lillebø

Pardal

2008

Estuarine, Coastal and Shelf Science

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The Mondego estuary is a well-described system located on the North Atlantic Ocean, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to a large productivity of Ulva spp., Zostera noltii meadows were severely reduced with a concomitant decrease in environmental quality. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient-rich freshwater inflow, to reverse the process in the most affected area of the estuary e its South arm.The objective of this study was to assess the differences in response of primary producer assemblages to the implemented measures to reduce eutrophication.Results show that the mean concentrations of DIN suffered a notorious decrease due to a significant reduction in the ammonium concentration in the water column, while DIP increased significantly. Primary producer assemblages showed different responses to these changes: phytoplankton, measured as concentration of chlorophyll a, did not show any significant changes; green macroalgae, mostly Ulva spp., suffered a large reduction in biomass, whereas Gracilaria gracilis and the macrophyte Zostera noltii biomasses increased greatly. Results show that phytoplankton biomass has remained constant and suggest that the reduction in ammonium could have been responsible for the changes in the green macroalgal biomass. Light was the most likely factor in the response of seagrass whereas red macroalgal reaction seemed to be dependent on both light and ammonium.

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“…In populations of Fucus vesiculosus in the Baltic Sea, pH was about 9 in summer (Pearson et al 1998). In dense floating macroalgae in a brackish coastal lagoon in the Ebro River Delta (NE Spain) maximum pH was 9 to 9.5 (Menendez et al 2001) and pH values as high as 9.8 to 10.1 have been reported from isolated rock pools in Sweden (Björk et al 2004). Even though pH has never been measured systematically and continuously in natural macroalgal habitats, these sporadic measurements suggest that pH occasionally is high.…”

Section: Introductionmentioning

confidence: 99%

High pH in shallow-water macroalgal habitats

Middelboe

Hansen²

2007

Mar. Ecol. Prog. Ser.

104

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The aim of this study was to evaluate seasonal and diurnal variability in pH and inorganic carbon in shallow-water macroalgal habitats and to evaluate the importance of high pH for macroalgal photosynthesis. Seasonal variations in pH, oxygen saturation and inorganic carbon concentration were measured at an exposed and a sheltered shallow-water (0 to 1 m) macroalgal habitat. Daytime pH was significantly higher in spring, summer and autumn than in winter at both study sites. Diurnal measurements at the most exposed site showed significantly higher pH during the day than during the night. The diurnal variations were largest in shallow water and decreased with increasing water depth. High pH resulted in periodically low concentrations of available inorganic carbon in summer (as low as 1.3 mmol [CO 2 + HCO 3 -] l -1). Photosynthesis as a function of inorganic carbon concentrations was measured at pH 8 and 9.3 for 4 common macroalgal species (Fucus vesiculosus, F. serratus, Ceramium rubrum, Ulva sp.). Photosynthesis in these species was not limited by natural concentrations of inorganic carbon, but maximum photosynthesis and inorganic carbon concentrations at saturation were lower when measured at pH 9.3 than at pH 8. Our results suggest that pH is higher in natural shallow-water habitats than previously thought, and that high pH has a direct effect on photosynthesis that cannot be accounted for by low availability of inorganic carbon. KEY WORDS: pH · Seasonal variations · Diurnal variations · Macroalgae · PhotosynthesisResale or republication not permitted without written consent of the publisher

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A comparative study of the effect of pH and inorganic carbon resources on the photosynthesis of three floating macroalgae species of a Mediterranean coastal lagoon

Cited by 62 publications

References 28 publications

Tissue Nitrogen and Phosphorus in Seaweeds in a Tropical Eutrophic Environment: What a Long-Term Study Tells Us

Tissue Nitrogen and Phosphorus in Seaweeds in a Tropical Eutrophic Environment: What a Long-Term Study Tells Us

The response of primary producer assemblages to mitigation measures to reduce eutrophication in a temperate estuary

High pH in shallow-water macroalgal habitats

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