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Zooplankton

Zooplankton. Objectives. Be able to define zooplankton Be familiar with the major groups of zooplankton and their characteristics Explain the benefits of zooplankton Explain how certain zooplankton can gauge reproductive success. Zooplankton.

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Zooplankton

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  1. Zooplankton

  2. Objectives • Be able to define zooplankton • Be familiar with the major groups of zooplankton and their characteristics • Explain the benefits of zooplankton • Explain how certain zooplankton can gauge reproductive success

  3. Zooplankton • Zooplankton are the “animal-like” members of the plankton • Permanent and temporary planktonic forms • Most groups are multicellular and categorized by mouth parts and/or appendages • Most groups feed as heterotrophic consumers • Generally indicate a “healthy” ecosystem

  4. Major Groups of Zooplankton • Protozoa • Ciliates, Amoebae • Rotifera • Copepods • Gelatinous Zooplankton • Invertebrate and Vertebrate Larvae

  5. Protozoa • Single cell organisms • Primarily feed on bacteria and phytoplankton • Capable of reproducing rapidly due to small size • Most species capable of forming cysts • Microzooflagellates, ciliates, amoebae

  6. Ciliates and Amoebae

  7. Rotifera • Typically referred to as “Rotifers” • “sloppy feeders” on phytoplankton and other zooplankton • recycle nutrient via feeding and fecal pellets • parthenogenic eggs

  8. Rotifers

  9. Copepods • “Sloppy feeder” on phytoplankton and other zooplankton • Major source of food for larval fish • Recycles nutrients via feeding and fecal pellets

  10. Copepods

  11. Gelatinous Zooplankton • Commonly referred to as jellyfish • Most have stinging cells called cnidocytes but some are filter feeders • May be permanent of temporary members of the plankton

  12. Ctenophores • Cteno means comb: sometimes called comb jellies • Gelatinous filter feeding organisms- no stinging cells • May be bioluminescent • Common in the Bay in the early Spring

  13. Comb Jellies

  14. Cnidarians • Stinging cells • Chrysaora quinequecirrha • Stinging and feeding tentacles • Male and female forms • “jelly” is the sexual stage of the life cycle and is called the medusa stage

  15. Other CnidariansHydromedusa, Portugese Man-o-war

  16. Larvae of Invertebrate and Vertebrate Animals • Temporary members of the plankton • Invertebrates are animals without backbones: worms, oysters, crabs • Vertebrates are animals with backbones: fish

  17. References • http://www.bayjournal.com/95-03/zooplank.htm • http://faculty.washington.edu/cemills • Many links to each group when typing group name

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