Microbio Flashcards
what is the percentage of water on earth?
and what is the percentage of water coming from oceans?
71% and 96.5%
what are the primary producers? and what are they? hetero/auto, photo/chemo…
algae( eukaryote) and cyanobacteria (also fix nitrogen) and they are oxygenic photoautotrophs.
what does phyto in phytoplancton mean?
plant
the biological activity of an aquatic ecosystem dépends on what?
the activity of the primary producers
algae and cyanobacteria serve as food source for what?
chemoheterotrophs (bacteria, protozoa (zooplancton, zoo=animal), fish and other aquatic organisms)
what are the 3 things that the activies and net Numbers of phytoplancton depend on?
temperature
light received
availability of specific limiting nutrients (nitrogen and phosphorus)
what is the photic zone?
it is the maximum depth that light will penetrate in clear water.
how much is the photic zone in m?
300 m
microorganisms must be able to Harvest light…
that reaches them (accessory pigments)
true or false?
light penetration in open ocean is higher than in coastal water.
true.
the water is more turbid in coastal water
how do we call organisms that live in marine environment where the salinity is high (3%)?
halotolerant or halophile
what is the temperature below 100 m?
constant at 2-3°C
sea is considered deep (deep sea) after how much m?
1000 m
what is the percentage of ocean that is considered as deep sea?
75%
what is the deepest in ocean and what is the pressure?
11 km and 1100 atm.
1 atm/10 m
