Download - Chapter 6 marine microbes
Chapter 6 Marine Microbes
(organisms invisible to the naked eye)
• Include viruses, one-celled organisms, and fungi.• Microbes play many different roles in marine
ecosystem. (structure leads to function)• Phytoplankton-planktonic algae• Zooplankton-larvae of small animals-ex fish, jellyfish• We will discuss 3 of these in detail that you will be
accountable for1. Diatoms2. Dinoflagellates3. Forams
Diatoms
• Most distinctive of plankton samples• Low latitudes-occur in coastal waters• Phytoplankton-Contributed to most of
primary productivity of an area.
Diatom Structure
• Glassy Cell wall• 2 valves- 1 large, 1 small• Visible geometrically shaped pattern-(helps
distinguish between species)• Size: 2 micrometers to 4 millimeters
Reproduction
• Asexually by fission• When cells divides, each daughter gets one of
the 2 valves• Eventually daughter that inherited smaller
valve will reproduces sexually
Dinoflagellates- structure
• Globular, single-celled organisms• 2 flagella that lie in groves on the center of
surface• Larger of phytoplankton• Look similar to soccer ball under microscope
Reproduction
• Asexually by fission– Split cell into two– Can happen at a rate of one division per day
• Sexual in some species by gametes
• If you had two species of Dinoflagellates and species A produced asexually while species B produced sexually, which species to you expect to survive throughout time longer and why?
• Zooxanthellae are collections of dinoflagellates– They lack flagella like most species– Mutualistic relationships with corals, jellyfish, and
mollusks.• Some species are responsible for Red Tide– algae bloom-large quick population boom– Produce toxins, usually cannot eat fish during this
time– http://www.youtube.com/watch?
v=auEePWRqj7Y&safety_mode=true&persist_safety_mode=1&safe=active
Goodby’s Creek in Mandarin during last Algae Bloom
Forams
• Have a pseudopod-organelle that is an extension of the cell surface– Used for locomotion and food capture
• Have a shell• deep as Marianas Trench• members of zooplankton
Foram Reproduction
• Asexual fission most species• Sexual reproduction-some species
• http://www.youtube.com/watch?v=Fpry23bS6g0&safety_mode=true&persist_safety_mode=1&safe=active
Exit Slip
• Using you knowledge and distinguish between phytoplankton and zooplankton
• Compare and contrast- Diatoms, Dinoflagellates, and Forams