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Freshwater Phytoplankton Key for the Northeast

Freshwater Phytoplankton Key for the Northeast. By: Rachael Brown, Sonya Carlson, and Diana Jackson Under the guidance of Dr. Alan Baker. NEXT. Introduction:.

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Freshwater Phytoplankton Key for the Northeast

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  1. Freshwater Phytoplankton Keyfor the Northeast By: Rachael Brown, Sonya Carlson, and Diana Jackson Under the guidance of Dr. Alan Baker NEXT

  2. Introduction: This photographic key is intended to aid in identification of freshwater algae to the Genus level. Proceed through this key by clicking on the picture that most resembles your organism. Buttons to know: Home: Go to the beginning page at any time Back: Go to the last page viewed Forward: Go to the next page in the key START To Start Key Click Here

  3. Cells with definite chloroplasts and nuclei, not blue-green in color Cells without definite chloroplasts and nuclei, blue-green in color

  4. Vegetative cells usually grass-green in color and with a definite cell wall Vegetative cells not grass-green

  5. Vegetative cells yellowish to brown with a glass-like silica wall of two overlapping halves Vegetative cells yellow-green with a cell wall

  6. Class: Chrysophyceae Class Under Construction

  7. Class: Cyanophyceae Common Name: Cyanobacteria, blue-greens Continue to Genus

  8. Is the general contour of the specimen: Elongate strands of cells Oblong, Circular, or Globular Rectangular Sperm shaped Note: A filament is a strand of cells arranged end to end

  9. Elongate filaments of cells Are the filaments: Unbranched Branched

  10. Genus:Microthamnion

  11. Unbranched: Filaments form together in parallel colonies (rafts) Filaments are found alone

  12. Option A: Oblong Option C: Globular Oblong, Circular, or Globular Option B: Circular

  13. Sperm-Shaped Head has thick wavy membrane Head has thin membrane

  14. Genus: Aphanocapsa

  15. Genus: Aphanothece

  16. Genus: Chroococcus

  17. Genus: Coelosphaerium

  18. Genus: Gloeocapsa

  19. Genus: Microcystis

  20. Genus: Merismopedia

  21. Genus: Cylindrospermum

  22. Genus: Gloeotrichia

  23. Genus: Anabaena

  24. Genus: Aphanizomenon

  25. Genus: Calothrix

  26. Genus: Chamaesiphon

  27. Genus: Lyngbya

  28. Genus: Nostoc

  29. Genus: Oscillatoria

  30. Filaments are joined at one end Filaments are parallel and are not joined together at any end

  31. Filaments have elongate cells arranged end to end Filaments have horizontal cells that are stacked on top of each other

  32. Cells are round and are arranged in long filaments (like strands of pearls) Elongate unicells are found on a substrate Filaments Found Alone unicells

  33. Cell shape is rectangular Cell shape is oblong

  34. Filaments are spaced apart from each other Filaments are lumped together

  35. Option A: Oblong Cells join in even numbers and have a clear membrane around them Cells float freely apart from each other

  36. Cells are congregated and encased in a round membrane Cells are free floating with thin clear membranes Option B: Circular

  37. Cells are encased in a thick green membrane Cells are encased by a clear membrane Encased Cells

  38. Order: BacillariophyceaeCommon Name:Diatoms Continue to Genus

  39. Does organism have stalks? Is the shape of the organism rectangular? Is the shape of the organism circular or oval?

  40. Are there many rectangles joined together? Are the rectangles separate from each other?

  41. Do the rectangles make a line or stairstep formation? Do the rectangles form a box? Do the rectangles form a star?

  42. Genus: Tabellaria

  43. Genus: Asterionella

  44. Genus: Eunotia

  45. L L W W Width (W) of individual cells is 1/10 of the length (L) Width (W) of individual cells is 1/5 of the length (L)

  46. Genus: Fragilaria

  47. Genus: Fragilaria

  48. Are there many small circles within the cells? Is the end of the cell a long spike or is there a few large circles within the cells?

  49. Genus: Melosira

  50. Genus: Rhizosolenia

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