Plankton.

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Presentation transcript:

Plankton

What are Plankton? Organisms that exist adrift in the ocean, unable to swim against currents and waves. Most (but not all) are very small. They include cyanobacteria, diatoms, dinoflagellates, various larvae, and jellyfish (which we will examine later).

Characteristics of all cells Have selectively permeable membranes Contain DNA as genetic material Contain cytoplasm Have Ribosomes

Two types of cells: contrast Prok’s and Euk’s Prokaryotes Eukaryotes

Plankton: some examples of each Eukaryotes include Phytoplankton like Protists and Marine Plants Zooplankton like Jellyfish, Meroplankton (larval animals), and Holoplankton (forever tiny ie:copepods) Prokaryotes include Cyanobacteria, also called Blue Green Algae Thermophillic Bacteria in deep sea vents Fecal Coliforms like E. coli

Phytoplankton Zooplankton

Who are the phytoplankton? Homework Part 1: 4-15 to 4-18 Diatoms Dinoflagellates Coccolithophores Cyanobacteria

The attack of the killer algae Harmful algal blooms (HABs)

HAB’s Or “red tides”: but not always red, and not related to tides Mostly from dinoflagellates, a few diatoms Associated with high supply of nutrients Toxins a byproduct of metabolism– neurotoxins, paralytic, diarrhetic, amnesic Indirect poisoning thru food web: People eat fish or shellfish that eat the Dinoflagellates

Homework Part 2 Visit the HAB’s website, then draw and describe the life cycle of a dinoflagellate http://www.whoi.edu/website/redtide/home How do ocean currents affect these blooms?