Pelagic (Water Column) Communities
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Pelagic (Water Column) Communities Part 1. Pelagic EnvironmentPelagic Organisms neritic plankton oceanic nekton neuston. Plankton – by type and size phyto, zoo, bacterio. neritic zone: low tide mark to the edge of the continental shelf, about 200 meters

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Pelagic (Water Column) Communities Part 1

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Pelagic water column communities part 1

Pelagic (Water Column) Communities

Part 1


Pelagic water column communities part 1

Pelagic EnvironmentPelagic Organisms

neritic plankton

oceanic nekton

neuston

Plankton – by type and size

phyto, zoo, bacterio


Pelagic water column communities part 1

  • neritic zone: low tide mark to the edge of the continental shelf, about 200 meters

  • oceanic zone: beyond OCS and >200m

http://www.seafriends.org.nz/enviro/habitat/eco04.gif


Pelagic water column communities part 1

  • Plankton - Passively floating, drift by water currents or weakly swimming minute or micro. organisms, primarily algae, bacteria, eggs, larvae, protozoa and invert. predators.

  • Nekton - Rel. large, actively swimming organisms, move independently of currents, strong locomotory powers

  • Neuston - minute or microscopic, float on or immediately under water surface

  • Pleuston - organisms occupying the air-water interface (part above water)


Plankton size classes

Plankton size classes


Time spent in plankton

Time spent in plankton

  • Holoplankton – entire life cycle in plankton

  • Meroplankton – part of life cycle in plankton, larvae (benthic, pelagic)


Phytoplankton

Phytoplankton


Pelagic water column communities part 1

Diatoms – pill box or petri dish cell wall of SiO2. Predominate in temperate and arctic


Pelagic water column communities part 1

Dinoflagellates – have 2 flagella, cellulose plates. Predominate in tropics

Toxic species – red tide organisms, Pfiesteria


Diversity

Diversity


Zooxanthelle symbionts

Zooxanthelle - symbionts

http://www.chbr.noaa.gov/categories/raim/images/coral_01.jpg


Red tides

Red Tides

http://serc.carleton.edu/images/microbelife/topics/red_tide_for_ed.jpg


Pelagic water column communities part 1

Coccolithophores

Autotroph

Nanoplankton,

CaCO3 plates or “buttons”


Foraminifera

Foraminifera

  • amoeboid protists

  • fine strands of cytoplasm forms live net

  • shell of calcium carbonate (CaCO3) or agglutinated sediment particles,

  • one or multiple chambers


Radiolaria

Radiolaria

  • amoeboid protozoa

  • hetrotroph

  • SiO2mineral skeletons

  • radiolarian ooze.

  • Rapid speciation - important diagnostic fossil


Other phytoplankton groups

Other phytoplankton groups

  • Cyanobacteria

  • Green algae, chlorophytes


Homework assignment

Homework assignment

  • HAB – in general, what are they, what are some different types, what causes them (how and why do they form), where do they occur

  • Research recent cases of HAB, use an HAB example to answer (provide basic references)

  • Organism involved and bloom cycle ,

  • how and why does this HAB form,

  • where it has occurred

  • specific ecosystem effects

  • economic effects


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