Week 5 Flashcards
Changes in biomass through time are a function of _______ and __________ (cell mortality)
growth
loss terms
Growth rates are a function of __________, ________, and ___________
temperature
light
nutrients
Mortality is usually due to _________ by zooplankton
grazing
Marine _______ lead to some mortality (smaller loss term)
viruses
Some larger phytoplankton can directly ________ of the euphotic zone leading to mortality at depth
sink out
The ___________________ is the fraction of light that would be absorbed or scattered, passing through 1 m of seawater
attenuation coefficient
Chlorophyll absorbs strongly at wavelengths of ______nm and ______nm
443
680
The absorbance spectra of these phytoplankton are due to absorption of light by their ________ and the other _________________
chlorophyll
accessory pigments
The community response to changing temperatures is _________ than for individual species
weaker
Liebig’s Law of the Minimum
Whichever nutrient is lowest in concentration relative to the nutritional needs of the plants will limit their growth rates
The mean ratio of nitrate/phosphate in the deep oceans is about 15/1, lower than the Redfield ratio due to _____________, which removes nitrate but not phosphate
denitrification
Smaller cells are _____________ at nutrient uptake when nutrient concentrations are low (have lower Ks values)
This is due to their ______________________
more efficient
higher surface/volume ratios
The concentration that is one half of the level at which the maximum saturation occurs is called the ___________________ (Ks)
half-saturation constant
_____________________ can be estimated using the Michaelis-Menton equation
relative nutrient uptake rates
Kn is the _______________ for uptake of that nutrient
half-saturation constant
V will also given the ______________
relative growth rate
Michaelis-Menton equation
V = [N] / ([N] + Kn)
According to Stokes’ Law, the sinking velocity (W) of spherical particles at low Reynold’s numbers
__________ with increasing porosity (P)
__________ with excess density (delta rho)
__________ with square of radius (r)
decrease
increases
increases
