Microbiology of water Flashcards
(46 cards)
On what does biological activity of an aquatic system ultimaly depends on?
activity of primary producers
What is phytoplankton ?
Algae, that with carbon source, will be a source of food for organisms (chemoheterotrophs)
On what factors does phytoplankton and other organsims activity depends on?
- Temperature
- Light received
- Availability of specific limiting nutrients such as nitrogen and phosphorus
On what does the photic zone depend on?
On turbidity of the water…
How will the microorgansisms in deeper water have to harvest light?
Phycobillins and Chlorosomes ( huge protein attennea that you find in green bacteria)
In marine environment, concentration of salt is ___, so organisms are _____.
3%
Halotolerant
75% of the ocean is deeper than _____. Deep sea is also called ____.
1000m
Pelagic zone
Under 100m, the temperature is constant ( ____ degrees). Organisms living there are mostly _____ or ______.
2-3 degrees
Psychrophiles, psychrotolerant
The open ocean (does or doesn’t) have a low primary activity. Open ocean is a ___________ environment .
Does
OLIGOTROPHIC
What does Oligotrophic mean? What environment is oligotrophic?
Low in nutrients, because low primary productivity
Open oceans a
What are protochlorophytes, where are they found? give an exemple
Primary producers. Tiny phototrophs phylogenically related to cyanobacteria. They are found in open ocean.
Prochlorococcus
What are general adaptation seen in pelagic microorganisms?
- Reduced size (high surface/volume ration)
- This is energy favorable - High affinity transport system (so can capt nutrients in a poor nutrients environment )
Who am I?
- Filamentous cyanobacteria
- Contain phycobillins
- nitrogen fixer
Trichodesmium
What are the main primary producer in coastal water?
Algae and cyanobacteria
How is productivity higher in coastal water?
Influx of nutrients form rivers and other polluted water source
What does eutrophic mean?
High in primary productivity, rich in nutrients
Coastal water is eutrophic or oligotrophic?
Eutrophic
What nutrient is limiting in coastal water?
Nitrogen
What is a negative thing that can happen in coastal water?
Red tides ( algal bloom, dinoflagellates, neurotoxins)
What are the characteristics of deep sea ( below 1000m)? what organisms are found there?
Organic carbon is very scarce
Oligotrophic environment
No light
Very few microorganisms
- Psychrophilic, barophilic, barotolerantWhat is an example of protist found in deep sea?
Xenophyophore, large protist related to psalmodial slime mold
What do hydrothermal vent provide?
- Heat
- source of nutrients
- Source of electron donors
- Source of electron acceptors (ex sulfur)
Exemple of symbiotic relationship in hydrothermal vent environment?
Tube worms that live in symbiosis with oxidizing chemoautotrophs
Tue worms trap and transport nutrients to the bacterial symbionts
What are the limiting nutrient in freshwater environment?
Nitrogen and phosphorus
