Sentences with phrase «photic zone»
The phrase "photic zone" refers to the part of the Earth's ocean or a lake where there is enough sunlight for photosynthesis to occur. It is the area where plants and algae can grow and provide food for other marine life. Full definition
The upper photic zone is low in nutrient concentration, high in light intensity and penetration, and usually higher in temperature.
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The lower photic zone is high in nutrient concentration, low in light intensity and penetration and relatively cool.
This research not only provides the first clear evidence that microorganisms were directly involved in the deposition of Earth's oldest iron formations; it also indicates that large populations of oxygen - producing cyanobacteria were at work in the shallow areas of the ancient oceans, while deeper water still reached by the light (the photic zone) tended to be populated by anoxyenic or micro-aerophilic iron - oxidizing bacteria which formed the iron deposits.
We conclude that the chemical signature plastic debris acquires in the photic zone can induce foraging behaviours in anchovy schools.
I believe the story goes as follows: winter storms cause a lot of mixing; in the spring light triggers phytoplankton activity, and the mixed layer becomes shallower due to surface warming, so the phytoplankton are not mixed out of the photic zone, and these factors conspire to result in a bloom.
The middle photic zone is an area that contains the same values in between that of the lower and upper photic zones.