miocrbes and palnts Flashcards
lec 9
why are viruses important in population dynamics of aquatic ecosystems
because they can easily move through water (suspended in water) = easily access fish and plants and shit
why aren’t viruses technically organisms themselves
they require a host to survive
T/F; viruses are host sensitive
false: viruses can be host sensitiv or widely infective
when are virus infection rates high
high density of hosts to infect and the virus
remains viable outside host for a long time
viruses get deactivted how? x3
uv light
goes into improper host
predation by microflagellates
archaea live in ____ enviornment
extreme
____ is the group that is most abundant (by biomass)
bacteria
cyanobacteria:
get energy/food via =
use _____ light
habitat =
bloom conditions =
photosynthess
green
most aquatic habitats (even extreme)
lots of nutrients + warm + calm conditions
how does cyanobacteria affect water quality
kills fish
closese beaches
contaminates drinking water
cyanobacteria fix _____ and produce ____ byproducts
nitrogen
toxic
algal bloom associated with ______ of lakes
eutrophication (too mch nutrients)
Protoctista are very important base of food web becauses…
they create the majority of primary production and do majority of nutrient recycling
autotrophic protoctista example
algae
red algae:
freshwater habitat =
why is it red? =
how does the red colour affect where it can live? =
small streams with low light
eat blue/green light and reflects red light
they can live in shaded eenviornments because they’re taking the leftover light that the taller trees aren’t using
golden algae:
habitat =
physical characteristic =
____-trophic
attached to phytoplankton in low nutrient lake
two flagella
mixo-trophic