Terrestrial versus oceanic ecosystems
15 important questions on Terrestrial versus oceanic ecosystems
Where do you find a lot and where less nitrate in the oceans?
Low concentration in mid-ocean gyres
How much accounts oceanic GPP for the global GPP?
What is mainly responsible for the GPP of the oceans?
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Why does phytoplankton have higher photsynthetic rates per gram biomass compared to vegetation?
How does photosynthesis occur in phytoplankton?
C3 is most common but other variants also happen y is unknown.
What is the euphotic zone?
What is blue carbon?
A disproportionally important C sink
Conservation important to prevent C loss
What is noticable about decomposition in the ocean vs terrestrial?
80-95% is decomposed in the surface ocean.
the litter quality and decomposition rate is high, terrestrial is variable, low.
What limits nutrient uptake by plankton in nutrient-poor waters?
Where do you see more large and where smaller plankton?
● High surface-to-volume ratio leads to less diffusion limitation
▪ Larger phytoplankton in nutrient-rich waters (e.g. coasts)
● Diffusion less limiting; nutrients can be stored internally
● Less prone to grazing than small phytoplankton
Why does the size matter to grazing of phytoplankton?
What is the proximate limiting nutrient for phytoplankton
How can N2 be fixated in the ocean?
only bacteria containing chlorophyll-a
There are some areas with high N and P yet little phytoplankton, how come?
Where comes most available N in the oceans come from?
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