LEC 22 - INTRO 2 PPTON Flashcards
if i use the following methods, what will i find?
surface sampling:
van dorn sampling:
net samplin:
surface: surface ppton
van dorn: deeper waters
net: bigger ppton, but smaller ones slip through the mesh
what are plankton? some pton have flagella - why are they considered pton?
pton are dudes that live in the water column, where placement is largely due to water currents
pton w flagella movement is minimal in the grand scheme of things, so theyre still considered pton
key traits of cyanobacteria
- can fix N, so they thrive in N limited environ (low N:P ratios)
- [+] buoyant ie floats, and can also control buoyancy using gas vesicle
- largely inedible bc they’re slimy and taste bad :(
key traits of chlorophytes
thrive when cyanobacteria don’
key traits of diatoms
- large + heavy silica skeleton = fall out of water column
this means they thrive in spring/fall when wind mixes the water column - resting state
key traits of chrysophytes + cryptophytes
- SMALL flagellated mixotrophs –> eat bacteria
IMPORTANT IN OLIGO- AND DYS- SYSTEMS BC HELLA ORGANIC MATTER
key traits of dinoflagellates
- LARGE flagellated mixotrophs - eat a shit ton
- bc they’re bigger, they themselves are inedible by pton (but open to ptonivore fish)
on an oligo- to eu- scale, how do various ppton thrive?
- mixotrophs do best at lower nutrient (P)
- diatoms do pretty good until they hit higher nutrient concs
- chlorophyta are cucked by cyanobacteria pretty much the whole time
- cyanobacteria fuck everyone up
why is the SA:V ratio so important? are higher or lower SA:V organisms advantaged?
higher SA:V has two main implications
- higher SA:V means more SA to uptake nutrients, but its limited by the fact that volume increases at a faster rate –> the higher SA:V u get, the slower u get all the nutrients u need
- higher SA:V means higher boundary layer volume relative to the cell - decr nutrient uptake (on some gojo satoru shit: the closer u get to the cell, the slower it moves bc its so crowded)
on a cellular level, smaller organisms are favoured
micro, nano, and pico ppton. what predation effects do they feel
micro: the largest - eaten by macrozpton, some fish
nano: the middle - eaten by macro and micro zpton
pico: the smallest - eaten by microzpton and filter feeding macrozpton
define ‘gape width’
the max size that an organism can fit in its mouth
what size organisms do best in oligo- lakes? eu-?
in oligo lakes, smaller organisms do better as they can meet their nutrient requirements easier (large organisms have a tougher time reaching requirements)
in eu lakes, larger organisms do better as the nutrient limitation goes away
keep in mind that zpton also benefit at this point, so grazing on larger ppton begins
what is the diff bw red algae, green algae, and cyanobacteria
red have phycoerythrins + chlorophyll, green have chlorophyll, cyanobacteria have phycobillins + chlorophyll a
chrysophyceae have silica similar to diatoms. how is it that they can move around?
flagella + scales of silica, not a whole skeleton
diatoms have two forms: centric and pennate. which form is found where
centric is more pton, pennate is more benthic
