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the ecophysiology of inorganic carbon assimilation by Durvillaea potatorum (Durvillaeales, phaeophyta) Raven, J.A.; Beardall, J.; Roberts, S. (1989). the ecophysiology of inorganic carbon assimilation by Durvillaea potatorum (Durvillaeales, phaeophyta). Phycologia 28(4): 429-437. https://dx.doi.org/10.2216/i0031-8884-28-4-429.1 In: Phycologia. International Phycological Society: Odense. ISSN 0031-8884; e-ISSN 2330-2968

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Beschikbaar in	Auteurs
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Trefwoorden

Absorption (food) Biology > Physiology > Ecophysiology Biology > Physiology > Plant physiology Chemical compounds > Inorganic compounds Chemical elements > Nonmetals > Carbon Comparative studies Cycles > Tidal cycles Ecological zonation Environments > Aquatic environment > Benthic environment > Littoral zone > Sublittoral zone Inorganic matter Fucales [WoRMS]; Laminariales [WoRMS] Marien/Kust

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Auteurs		Top
Raven, J.A. Beardall, J. Roberts, S.

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Abstract

Properties of inorganic C assimilation by the upper sublittoral brown macroalga Durvillaea potatorum (Labilardiere) Areschoug (Durvillaeales) were measured for comparison with the properties of C assimilation by eulittoral and sublittoral members of the Fucales and Laminariales. The dependence of O2 evolution on inorganic C concentration at pH 8.0 shows that seawater (2 mol m-3) inorganic C concentration is not quite saturating for light-saturated photosynthesis. The occurrence of HCO3- use was investigated by pH drift experiments, O2 evolution as a function of inorganic concentration at an external pH of 9.2, and comparisons of the rate of photosynthesis at pH 8.0 and pH 9.2 with the rate of uncatalysed CO2 production from HCO3 - at the inorganic C concentration in the O2 electrode chamber. All approaches suggest that the D. potatorum has a lower capacity to use external HCO3 - than do many eulittoral brown macroalgae. Overall, the characteristics of D. potatorum which were investigated more closely resemble those of the Laminariales and the Fucalean Halidrys siliquosa , which spend essentially all of their time submersed, than of the Fucaceae which spend some time emersed during most tidal cycles.

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