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Plankton

Plankton. http://www.dnr.sc.gov/marine/sertc/gallery.htm. http://www.coralreeffish.com/larvae.htm. Ocean Zones. Horizontal divisions: Coastal (neritic) = on/over shelf (shallow) Oceanic = beyond continental shelf (deep). Vertical divisions: Pelagic = open water Benthic =

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Plankton

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  1. Plankton http://www.dnr.sc.gov/marine/sertc/gallery.htm http://www.coralreeffish.com/larvae.htm

  2. Ocean Zones • Horizontal divisions: • Coastal (neritic) = on/over shelf (shallow) • Oceanic = beyond continental shelf (deep) • Vertical divisions: • Pelagic = open water • Benthic = ocean bottom

  3. Ocean Zones Holoplankton Meroplankton

  4. Plankton or Nekton? How fast can you swim? • Gulf Stream peak velocity • = 5 knots = 2.5 m/sec • Surface currents more typically • <0.5 knot = 0.25 m/sec (=0.56 mph) http://oceancurrents.rsmas.miami.edu/atlantic/img_mgsva/gulf-stream-YYY.gif

  5. Plankton or Nekton? Swim faster than 25 cm/sec? Yes→ Nekton: • Dolphin = 170 cm/sec (up to 40 mph!) • Tuna = 75 cm/sec (higher burst speeds) No→ Plankton: • Shrimp = 5 cm/sec • Bacteria = 0.005 cm/sec

  6. Slow, but not necessarily small Portuguese man-of-war float = 12 inches wide tentacles = over 150 ft. long (ouch!) http://www.dnr.sc.gov/marine/sertc/gallery.htm

  7. Net Plankton

  8. Phytoplankton • Cyanobacteria • Unicellular microalgae • Diatoms • Dinoflagellates • Coccolithophorids c2004 Pearson Education, Inc., publishing as Benjamin Cummings http://www.daviddarling.info/images/diatoms.jpg http://www.microscopy-uk.org.uk/micropolitan/fresh/protozoa/ceratiumdic2.jpg

  9. Zooplankton • Divided by life history: • Holoplankton – spend whole life (larval and adult stages) living as plankton • Meroplankton – spend only larval stage living as plankton, then grow up to be nekton or benthic as adults

  10. Zooplankton - Holoplankton • Protozoans (unicellular): • Foraminiferans • Radiolarians • Ciliates http://www.anu.edu.au/EMU/Images/radiol.jpg http://server1.fandm.edu/Departments/Biology/People/Shimeta/research/tin2.JPG

  11. Zooplankton - Holoplankton • Gelatinous: • Jellyfish (medusa) • Siphonophores NOAA http://life.bio.sunysb.edu/marinebio/plankton.html

  12. Zooplankton - Holoplankton • Gelatinous: • Comb jellies (ctenophores)

  13. Zooplankton - Holoplankton • Gelatinous: • Salps • Larvaceans (invertebrate chordates) NOAA

  14. Zooplankton - Holoplankton • Molluscs: • Pteropods (gastropods), with and without shell

  15. Zooplankton - Holoplankton • Crustaceans: • Copepods • Amphipods • Ostracods • Isopods • Krill, shrimp http://www.oceanexplorer.noaa.gov/gallery/livingocean/livingocean.html

  16. Zooplankton - Holoplankton • “Arrow worms” (Phylum Chaetognatha) http://pharyngula.org/images/chaetognathhead.jpg http://www.microscopy-uk.org.uk/mag/imgjan00/CHAET2b.JPG

  17. Zooplankton - Meroplankton • Mollusc larvae: • Trochophore • Veliger http://oceanlink.island.net/abaloneproject/growthanddevelopment/growth%20and%20development.htm http://people.bu.edu/veliger/

  18. Zooplankton - Meroplankton • Crustacean larvae: • Crab zoea • Shrimp, barnacle nauplius • Lobster phyllosoma NOAA http://www.dnr.sc.gov/marine/sertc/gallery.htm http://www.science-in-salamanca.tas.csiro.au/themes/larval/phyllosoma-early.htm

  19. NOAA Zooplankton - Meroplankton • Other larvae: • Starfish (bipinnaria) • Brittle stars, urchins (pluteus) http://raven.zoology.washington.edu/embryos/

  20. Zooplankton - Meroplankton • More larvae: • Polychaete worms (trochophore) http://www.microscopy-uk.org.uk/mag/imgmar99/poly3.jpg

  21. Zooplankton - Meroplankton • Fish larvae http://www.coralreeffish.com/larvae.htm

  22. That Sinking Feeling • It’s a long way down – average ocean depth around 4000 m • Phytoplankton – need to stay in the light surface layer (0-200 m) • Zooplankton – eat the phytoplankton and/or other zooplankton, so need to be where the food is http://www.nerc.ac.uk/images/photos/lp-ocean-sunlight.jpg

  23. That Sinking Feeling • Why am I sinking? Denser than water • Densities (in g/cm3): • Seawater = 1.025 • Air = 0.00125 • Lipids = 0.9 • Proteins = 1.3 • Carbohydrates = 1.5 • Cellulose = 1.5 • Silica shell = 2.6 • Calcareous shell = 2.8

  24. That Sinking Feeling • How not to sink: • Float – • Lipids (less dense than water) • Gas vacuoles, sacs, bubbles http://www-cyanosite.bio.purdue.edu/images/images.html

  25. NOAA That Sinking Feeling • How not to sink: • Stay neutral • High water content (gelatinous) • Reduced or no shell

  26. That Sinking Feeling • How not to sink: • Drag (high surface area) – • Small size • Flat shape • Spines, long structures -------- Isopod

  27. That Sinking Feeling • How not to sink: • Upwelling (also good for nutrients) Southern Hemisphere – Ekman transport to the left

  28. That Sinking Feeling • How not to sink: • Actively swim – cilia, flagella, muscles, appendages http://www.coralreeffish.com/larvae.htm

  29. Nowhere to Hide • Active predators can’t eat what they can’t see – so be invisible

  30. Nowhere to Hide • Active predators can’t eat what they can’t see – so hide where it is dark

  31. NOAA Somewhere to Hide • Floating mats of macroalgae and seagrasses form pelagic communities - camouflage Sargassum http://www.bigelow.org/bacteria/teach/images/open_orgs/sargassum.jpg http://www.naturalsciences.org/education/deepsea/images/sargassum_fish.jpg

  32. Food Webs

  33. Food Webs

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