Class 21. Flashcards
What are estruaries and what is the level of salinity?
1% to 3.2%
What is a salt wedge?
Where mixing of fresh and salt water occurs.
Are estuaries a nutrient rich or poor environment?
Nutrient rich
What are the diatom and dinoflagellates that can lead to harmful algae blooms.
Diatom: pseudonizchia
Dinoflagellates: Alexanderium and pfiesteria
Why do HAB (harmful algae blooms occur), or why?
Occurs due to discharge of orgnaic matter or nutrient rich material.
Brevetoxin is caused by which organism.
Caused by Alexanderium, a dinoflagellate.
What are the 4 habitats that Oceans can be divided into?
1) Neuston habitat: air water interface
2) Pelagic zone: water column that planktonic habitats.
3) Epibiotic: surfaces where attachted communites occur.
4) Endobiotic: Endobiotic, refer to organisms found inside the tissues of other later organisms like fish
The ocean is divided into photonics zone and aphotic zone. Photic zone can be up to _____ depth
200
Is the open ocean a oligotrophic or eutrophic environment?
Oligotrophic, low nutrients.
Who are the primary producers of the ocean?
Phytoplankton
What are some of the components of marine snow?
Fecal matter, dead and dying animals, phytoplankton
In which layers are microbes highest in the open ocean>
Neustran layer
What is the most abundant plankton in the sea?
Most abundant is SAR11. They make up 25% of all microbial life on earth.
What are VLP and discuss thier role in POM and DOM.
THey are virus like particles, that are the most abundant life form on earth. Help in nutrient cycling, and killing host making them into POM and DOM.
WHere is the largest microbial biomass?
Under the sea in teh Benthic environement. Here the microbes are barophilic and able to tolerate atm up to 1,100 atm.
