Lecture 15 - Nutrient Use and Remineralization Flashcards
limiting nutrients for aquatic primary producers. which of those are the most comon?
N, P, Si, Fe
N and P most common
primary producers use ____ forms of nutrients
inorganic
T/F: when cells uptake nutrients, they’ll always assimilate them
no not always, he could eat it and poop it out without actually using it
both nutrient uptake an assimilation require ____ to complete
energy
uptake rate depends on ________ in water
concentration of nutrients
uptake rate depends on _______ gradient
diffusion gradient
growth rate can be controlled by concentration of ______ and _______ of cells
nutrients inside and outside of cells
growth rate also depends on what TYPE/FORM of nutrient is floating in the water. what does this mean
some nutrients are faster at being assimilated than others
what is luxury consumption?
benefit?
is this a short or long term thing?
example of species that does this
some organisms take up nutrients very fast when exposed to high concentration of nutrients for short period of time
can give some guys a competitive advantage
can not do this long term because it’s a lot of work to store all this extra food
algae
what is stoichiometry
ratio of nutrients to each other
stoichiometry ratio of algae C:N:P give me the numbers
106:16:1
availability of nutrients determined by geology of environment. give two examples of how phosphorous can be limited by type of environment
clay binds phosphate = not available anymore
areas with volcanic ash = high phosphate = lots available
what are some limiting factors for aquatic ecosystems
nutrients (esp P and N), light, space
what is remineralization. and how do primary producers and heterotrophs contribute to remineralization
through decomposition or metabolic activity, nutrients are able to go back to the environment (replenish)
primary producers = cell lysis = release nuts
heterotrophs = poop nutrients in waste or decompose dead bodies = release nuts
