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Algae and Trout: Beauty and the Beast

Algae and Trout: Beauty and the Beast. Russ Rhodes An algal lover from Springfield, Missouri. Plan for the Evening . What are algae (size, color, clothes, shapes, mobility, contents)? What are their requirements? Where do you find algae? What is the relationship between algae and trout?

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Algae and Trout: Beauty and the Beast

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  1. Algae and Trout:Beauty and the Beast Russ Rhodes An algal lover from Springfield, Missouri

  2. Plan for the Evening • What are algae (size, color, clothes, shapes, mobility, contents)? • What are their requirements? • Where do you find algae? • What is the relationship between algae and trout? • What are some problems with algae? • Quiz • Open discussion

  3. Size Range • Microscopic • Macroscopic

  4. Color • Green • Golden brown • Reddish brown • Brown • Red • Blue green

  5. Clothes (External Coverings) • Cellulose • Protein • Calcium carbonate (chalk) • Glass • Naked

  6. Shapes • Spherical • Spindle • Colonial • Filamentous (thread-like)

  7. Mobility • Attached (no mobility) • Attached (mobility) • Swimming (“small oars”) • Floating (internal air sacs) • Creeping (“internal aids”

  8. Contents of Algae • Starch • Protein • Oils

  9. Requirements for Growth • Sunlight • Carbon dioxide • Nitrogen (nitrates, ammonia, and gaseous nitrogen) • Phosphorus (phosphates and organic phosphates • Other nutrients (silicon, magnesium, etc.

  10. Where do you find Algae? • Ice and snow • Hot springs • Any body of water • Lakes • Oceans • Any kind of substrate, sand, mud, rock, other algae, trees, • animals

  11. Relationships of Algae to their Environment • Primary producer, oxygen source for world, food source for most oceanic and much of the freshwater animals • Habitat producer, site for colonization, refuge

  12. What about Trout? • Trout come in a variety of colors and types also • They have wide distribution, world wide • Trout consume a wide variety of animals • Especially scud

  13. Brook trout Brown trout Rainbow trout Lake trout Cutthroat Bull trout Apache trout Dolly varden Gila trout Golden trout Splake Speckled trout Some Types of Trout

  14. Scud (Gammarus, an amphipod) • Small invertebrate • Grazer • Habitat • Rocks, sand, algae

  15. Achnanthes Amphora Cocconeis Cyclotella Diatoma Fragilaria Gomphonema Gryosigma Melosira Navicula Nitzschia Opephora Rhoicosphenia Synedra Some Genera of Diatoms Eaten by Scud

  16. Diatoms, Food for Scud

  17. Whoa there, what’s this? • Animal? • Plant? • Mineral? The Blob!!!

  18. Problems with Algae • Algal toxins • Hypoxia • Smell • Taste • Competition

  19. Hypoxia

  20. And now to the Blob • It was a plant! • The species is Didymosphenia geminata. • The plant type is a diatom. • World wide distribution • Similar problems in Washington, Canada, England, Arkansas

  21. Canada • Didymosphenia has been reported to grow to nuisance levels in a number of river systems around the province — especially throughout central Vancouver Island, where it was first reported in 1989. It has also been found in significant quantities in the Bulkley, South Thompson, Kettle, Columbia and Kootenay Rivers.

  22. The Blob in Arkansas

  23. Didymosphenia geminata • Colonial diatom • Cells divide • Attachment as gelatinous stalks • Massive plant • Cells (200-300 microns long)

  24. Growth of Didymosphenia • Small “seed” plants on rocks • Probable needs for massive growth • Bright sunlight • Slack water • Reduced phosphate

  25. Back at the Tailrace

  26. The Quiz • The title: Algae and Trout • The subtitle: Beauty and the Beast • Which is which? or

  27. Thanks for having me! • Many of the great photos were courtesy of Scott Branyan and Bob Britzke • The colorful diatom was courtesy of Mike Samworth, UK

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