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Intertidal Algae Diversity & Habitat Conditions

Learn about algae in the intertidal zone: classes, pigments, tolerance levels, and common habitats. Discover key species in different zones and their unique characteristics.

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Intertidal Algae Diversity & Habitat Conditions

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  1. ALGAE • Division CHLOROPHYTA • Division HETEROKONTOPHYTA • Division RHODOPHYTA

  2. DIVISION CHLOROPHYTACLASS CHLOROPHYCEAE • All shades of green • Chlorophyll A + B • They are often tolerant of difficult conditions: • Pollution • Reduced salinity • Commonly we can find: - In upper half of intertidal regions • In brakish water • On beaches subjest to freshwater run-off • Growing on pier piles • In splash-zone rock pools

  3. DIVISION HETEROKONTOPHYTACLASS PHAEOPHYCEAE • Brown algae • Chlorophyll + fucoxanthin • All are multicellular • They are several species on rocky shores • In shallow sublittoral situation; few species can tolerate reduced salinities or higher temperatures.

  4. DIVISION RHODOPHYTACLASS RHODOPHYCEAE • Red algae • Chlorophyll + phycoeritrin + phycocyanin (red pigment) (blue pigment) • The colour of different species is very variable • They are the most tolerant of reduced light conditions; They can survive in deeper water than other types of plant • Many red seaweeds are intolerant of drying out or reduced salinities. • Appear in permanent rock pools. • Very damp areas under larger plants • Sublittoral situations

  5. LOWER INTERTIDAL ZONE • DIVISION HETEROKONTOPHYTA • CLASS PHAEOPHYCEAE • Bifurcaria bifurcata • Cystoseira tamariscifolia • Sargassum muticum • Colpomenia peregrina

  6. LOWER INTERTIDAL ZONE • DIVISION RHODOPHYTA • CLASS RHODOPHYCEAE • Plocamium cartilagineum • Asparagopsis armata • Halopithys incurva • Gelidium sesquipedale • Chondrus crispus • Jania rubens • Corallina officinalis • Lithophyllum incrustans • Gelidium attenuatum

  7. LOWER INTERTIDAL ZONE • DIVISION CHLOROPHYTA • CLASS CODIACEAE • Codium adhaerens • CLASS ULVACEAE • Ulva rigida

  8. MID INTERTIDAL ZONE • DIVISION HETEROKONTOPHYTA • CLASS PHAEOPHYCEAE • Ralfsia verrucosa

  9. MID INTERTIDAL ZONE • DIVISION RHODOPHYTA • CLASS RHODOPHYCEAE • Hildebrandia prototypus

  10. Middle Intertidal Zone • DIVISION CHLOROPHYTA • CLASS CHLOROPHYCEAE • Enteromorpha intestinalis

  11. Upper Intertidal Zone • Blidingia minima (green) • Pelvetia canaliculata (brown) • Porphyra linearis (red)

  12. Lichens • MID INTERTIDAL ZONE • Lichina pygmaea • SUPRATIDAL ZONE • Verrucaria maura

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