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How to know the freshwater benthic algae

a. a. a. m. b. m. f. b. d. mm. m. How to know the freshwater benthic algae. Maria Kahlert. freshwater benthic algae. Check first: C o l o r: Bluegreen : bluegreen algae Green : green algae Yellowish-Brown : brown algae Diatoms Chrysophytes Brown algae Red : red algae

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How to know the freshwater benthic algae

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  1. a a a m b m f b d mm m How to know the freshwater benthic algae Maria Kahlert

  2. freshwater benthic algae Check first: • Color: • Bluegreen: bluegreen algae • Green: green algae • Yellowish-Brown: brown algae • Diatoms • Chrysophytes • Brown algae • Red: red algae Be aware of exceptions!!!

  3. freshwater benthic algae Exceptions in color: • Bluegreen red alga: Chroodactylon • Green ‘brown’ alga: Vaucheria • Green ‘brown’ alga: diatoms in bad shape • Red green alga: Haematococcus

  4. freshwater benthic algae Check also: • Absence/presence of cell organelles: • Absence: bluegreen algae = cyanoBACTERIA • Presence: all other algae • Presence of siliceous cell wall (distinctly shaped ‘glass house’): diatoms

  5. freshwater benthic algae Check next: • Bluegreen algae • Organization of thallus: • Coccoid • Filamentous • No branches • False branches • True branches • Presence/absence and place of heterocysts (N2 fixation) (only for the filamentous forms) • Length of cell

  6. freshwater benthic algae Check next: • Green algae • Organization of thallus: • Coccoid • Single cell/colonies/coenobia • Filamentous • Not branched/branched • Chloroplast morphology: • Cup-shaped • Parietal (like a tapestry, middle of cell is vacuole) • Axial (in the middle of cell)

  7. freshwater benthic algae Check next: • ‘Brown’ algae – Diatoms • Identification of living diatoms only grossly, must be prepared (see separate information) raphe (slit in cell wall) no raphe centric pennate

  8. freshwater benthic algae Check next: • ‘Brown’ algae • Chrysophytes and ‘real’ brown algaeVery few in freshwater, very different: • Hydrurus (golden) • Ophiocytium (green) • Tribonema (golden) • Vaucheria (green) • Pleurocladia (brown) • Hildenbrandia (brown)

  9. freshwater benthic algae Check next: • Red algae • Very few in freshwater • Heribaudiella • Chroodactylon • Audouinella • Batrachospermum

  10. freshwater benthic algae Some algal terms • Cell organelles – cell content with a membrane inside the cell • Siliceous cell wall – cell wall outside cell in diatoms, made from glass • Heterocysts – special cells in bluegreens fixating N2 • Thallus – body of alga • Coccoid – ball formed thallus • Filamentous – hair formed thallus • Coenobia- cell cannot divide mitotically, after meiosis, the mother cells dies and relieves a certain number of identically shaped daughter cells, a finished colony

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