Photosynthesis and respiration of exposed salt-marsh fucoids

Brinkhuis, B. H.; Tempel, Neal; Jones, Raymond F.

doi:10.1007/bf00398128

Cited by 71 publications

(27 citation statements)

References 8 publications

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“…l a , d) was first reported as long ago a s 1937 by Stocker and Holdheide. Their observations have since been confirmed for a wide range of intertidal algae, including species of UIva, Porphyra and Iridaea (Johnson et al, 1974;Brinkhuis et al, 1976;Quadir et al, 1979), but not previously for a species from the Laminariales (Fig. l b ) .…”

Section: Discussionmentioning

confidence: 75%

Photosynthesis of Intertidal Brown Algae During and After Periods of Emersion: A Renewed Search for Physiological Causes of Zonation

Dring¹,

Brown²

1982

Mar. Ecol. Prog. Ser.

213

145

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CO2-exchange of emersed plants and 0,-exchange of submersed plants were measured in 5 species of brown algae from different tidal heights on shores in Ireland and Helgoland (southern North Sea). The photosynthesis of emersed fucoids and Laminaria digitata increased as up to 25 % of tissue water was lost, but then declined with further desiccation. The relationship between decrease in photosynthesis and loss of tissue water was similar in 3 species of Fucus, and the photosynthetic apparatus of F. spiralisappeared to be no more resistant to desiccation than that of F. serratus. Recovery from severe desiccation took about 2 h in all species, regardless of their typical position on the shore, but the extent of recovery from a given degree of desiccation was greater in upper shore species. Pelvetia canaliculata and F. spiralis showed complete recovery from 80 to 90% water loss, F. vesiculosus from about 70 %, F. serratus from 60 %, and Laminaria digitata from 55 % water loss. The photosynthetic rate of each species after full recovery decreased linearly as water loss increased beyond these values. It is in the extent of recovery of photosynthesis after desiccation that intertidal brown algae show the clearest correlation with their heights in the zonation pattern on European shores.

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Section: Discussionmentioning

confidence: 75%

Photosynthesis of Intertidal Brown Algae During and After Periods of Emersion: A Renewed Search for Physiological Causes of Zonation

Dring¹,

Brown²

1982

Mar. Ecol. Prog. Ser.

213

145

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“…The emersed photosynthesis was enhanced at an early stage due to extracellular water loss and then reduced, probably due to intracellular dehydration, in Porphyra spp. (Johnson et al, 1974;Gao & Aruga, 1987), Fucus distichus (Quadir et al, 1979) and Ascophyllum nodosum (Brinkhuis et al, 1976); the maximum photosynthesis during emersion was higher than that when submerged. These studies demonstrated that the intertidal macroalgae, even dehydrated to about 15% water content, do photosynthesize in the air when they are exposed during the daytime.…”

Section: Introductionmentioning

confidence: 94%

“…For the intertidal macroalgae, when the tide is low and they are exposed to air, CO 2 is the only exogenous carbon source for their photosynthesis (whereas both HCO 3 − and CO 2 are available in seawater); therefore the intertidal macroalgae may be significantly sensitive to the atmospheric CO 2 increase. Photosynthesis of the intertidal macroalgae during emersion has been studied previously (Brinkhuis et al, 1976;Quadir et al, 1979;Oates & Murray, 1983;Oates, 1985;1986;Gao & Aruga, 1987). The emersed photosynthesis was enhanced at an early stage due to extracellular water loss and then reduced, probably due to intracellular dehydration, in Porphyra spp.…”

Section: Introductionmentioning

confidence: 99%

Relationship of CO2 concentrations to photosynthesis of intertidal macroalgae during emersion

Gao

Aruga³

1999

Sixteenth International Seaweed Symposium

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In order to assess the ecological impacts of the atmospheric CO 2 increase on the intertidal macroalgae during emersion, the photosynthesis of Enteromorpha linza (a green alga), Ishige okamurae (a brown alga) and Gloiopeltis furcata (a red alga) was investigated in air as a function of CO 2 concentrations and water loss. Their photosynthesis was not saturated at the present atmospheric CO 2 level (350 µl l −1 or 15.6 µM), the CO 2 compensation point and K [mCO 2 ] increased with increasing desiccation, showing that desiccation lowers the CO 2 affinity of the intertidal macroalgae. It was concluded that E. linza, I. okamurae and G. furcata, while exposed to air, can benefit from atmospheric CO 2 rise, especially when the algae have lost some water.

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“…Brinkhuis et al, 1977;Seip et al, 1979;Seip, 1980a,b;Ferreira and Ramos, 1989;Duarte and Ferreira, 1993);…”

Section: Introductionmentioning

confidence: 99%

A model for the simulation of macroalgal population dynamics and productivity

Duarte

Ferreira

1997

Ecological Modelling

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A mathematical model to simulate the population dynamics and productivity of macroalgae is described. The model calculates the biomass variation of a population divided into size-classes. Biomass variation in each class is estimated from the mass balance of carbon fixation, carbon release and demographic processes such as mortality and frond breakage. The transitions between the different classes are calculated in biomass and density units as a function of algal growth. Growth is computed from biomass variations using an allometric relationship between weight and length. Gross and net primary productivity is calculated from biomass production and losses over the period of simulation. The model allows the simulation of different harvesting strategies of commercially important species. The cutting size and harvesting period may be changed in order to optimise the calculated yields. The model was used with the agarophyte Gelidium sesquipedale (Clem.) Born. et Thur. This species was chosen because of its economic importance as a the main raw material for the agar industry. Net primary productivity calculated with it and from biomass variations over a yearly period, gave similar results. The results obtained suggest that biomass dynamics and productivity are more sensitive to the light extinction coefficient than to the initial biomass conditions for the model. Model results also suggest that biomass losses due to respiration and exudation are comparable to those resulting from mortality and frond breakage. During winter, a significant part of the simulated population has a negative net productivity. The importance of considering different parameters in the productivity light relationships in order to account for their seasonal variability is demonstrated with the model results. The model was implemented following an object oriented programming approach. The programming methodology allows a fast adaptation of the model to other species without major software development. © 1997 Elsevier Science B.V.

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Photosynthesis and respiration of exposed salt-marsh fucoids

Cited by 71 publications

References 8 publications

Photosynthesis of Intertidal Brown Algae During and After Periods of Emersion: A Renewed Search for Physiological Causes of Zonation

Photosynthesis of Intertidal Brown Algae During and After Periods of Emersion: A Renewed Search for Physiological Causes of Zonation

Relationship of CO2 concentrations to photosynthesis of intertidal macroalgae during emersion

A model for the simulation of macroalgal population dynamics and productivity

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