M2-2 Flashcards
saturation
the maximum amount of oxygen that an aquatic environ can host, based on the current abiotic conditions
supersat
DO conc is above sat. meaning that O2 will bubble out of solution
sub-sat
DO lvl are below sat
an/oxic vs an/areobic
they both address the absence or presence of O2 respectively.
temp and O2
less O2 w/ high temp
pressure and O2
more O2 w/ inc pressure
salinity and O2
Less O2 w/ inc salts
sources of O2 in lakes
atmos and PHOSYN
sink of O2 in lakes
diffusion, RESP AND OXIDATION
importance of O2
the DO in a system will influence the biological activity that can occur.
expressed as mg/L or mol/L or % sat
4 DO profiles (how much O2 found in a system)
orthograde
clinograde
heterograde
anamalous
DO profiles and how it changes seasonally (oligo)
fall and spring mixing will have lower temps and high O2 throughout then water colunm (often spring has more O2 than fall)
summer will follow an orthograde profile)
winter- similar to fall and winter as no O2 consumption is taking place
DO profile and diurnal pattern of streams
a delayed cycling event, aligning with sun rise and fall.
eutrophic systems have large amplitude and oligo (much more stable. minor shifts in O2- likely due to temp)
lowest (5mg/l) @ 4AM and highest (12mg/l) O2 at 4pm
anomalous profile
often inc in O2 lvl due to inflows into lakes
heterograde profile
less O2 in epi, as most primary prod are at the top of the meta. many O2 consumers are the bottom (non mobile). as tem dec in the hypo, o2 solubility ges back up w. less consumption too)
