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
diatoms:
habitat =
primary producer or heterotroph? =
physical charageristic =
can it move? =
benthic zone
primary producer
frustule; silica-based cell wall
no
dinoflagellates
habitat =
example =
physical charageristic =
____-trophic
lentic habitat (wetland, stream)
phytoplankton
cellulose plate “armor”
hetero-trophic
eugenophyceae:
live in ______ conditions
habitat =
can it move? =
eutrophic (high nutrient)
sediments
yes
green algae:
live in ____ conditions
unicellular forms =
multicellular forms attached to =
most ___ group of algae
oligotrophic (low nutrient) or eutrophic (high nutrient)
plankton community
benthic substrates
diverse
charophytes
habitat =
live in _____ conditions
wetlands and benthic zones
nutrient poor
protozoa
____-trophs
reproduce =
can do ___ cycling
likes _____ enviornment conditions
auto or hetero-trophs
sexually or asexually
carbon
stable
fungi
main job =
^ this is important because
habitat =
unicellular forms are ______
decomposers
breaking down detritus feeds low light organisms in water
terrestrial enviornemtns
parasites
macrophytes refer to what group
plants
plants
are abundant in ______ waters
rooted in ___ substrates
important ____ for fish
how do they get nutrients
shallow, slow-moving
fine
shelter
from the ground
non-vascular plants
examples =
streams are _____ and _____
provide _____ for fish
moss and liverworts
small and low nutrient
shelter
vascular plants
_____ plants
provide ___ to animales
create ___
flowering
shelter
oxygen
