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5 - The Appearance of Macroalgae: Evolution and Ecological Consequences of Multicellularity

from Part I - Origins and Consequences of Early Photosynthetic Organisms

Published online by Cambridge University Press:  24 October 2024

By
Olivier De Clerck  and
Catriona L. Hurd
Edited by
Mario Giordano ,
John Beardall ,
John A. Raven  and
Stephen C. Maberly
Mario Giordano
Affiliation:
Università degli Studi di Ancona, Italy
John Beardall
Affiliation:
Monash University, Victoria
John A. Raven
Affiliation:
University of Dundee
Stephen C. Maberly
Affiliation:
UK Centre for Ecology & Hydrology, Lancaster
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Summary

Multicellularity among algae is not restricted to macroalgae, nor are all macroalgae multicellular. Multicellularity contrasts with colonies of identical cells by differentiation of cell types and intercellular connections; by this definition, heterocystous cyanobacteria are multicellular, as are some freshwater green algae in the streptophyte and chlorophyte lineages. Multicellular, mainly marine, macroscopic algae include Rhodophyta and Phaeophyceae. Among large marine chlorophytan green algae, Ulva has no plasmodesmata, while differentiated Ulvophyceae, such as Acetabularia, Caulerpa, Halimeda and Codium, are composed of a single cell, demonstrating that organ growth and morphogenesis are independent from cell division, so the most complex green seaweeds are both macroscopic and unicellular/acellular. Macroscopic seaweeds of the Rhodophyta, Chlorophyta and Phaeophyceae clades arose from small unicellular ancestors, with the red and green lineages dating back most likely to the Meso- or Neoproterozoic (1,600–900 Ma) and brown seaweeds to about 200 Ma. Compared to benthic microalgae, macroalgae project beyond the substrate boundary layer, but have their own diffusion boundary layer constraining nutrient acquisition, and have more self-shading of photosynthetically active radiation than do individual microalgal cells. These constraints are partly offset by wave activity.

Keywords

brown algachlorophytadiffusion boundary layergreen algaemulticellularphaeophyceaerhodophytared algaeself-shadingsiphonal
Type
Chapter
Information
Evolutionary Physiology of Algae and Aquatic Plants , pp. 80 - 95
Publisher: Cambridge University Press
Print publication year: 2024

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