Lecture 6 Flashcards
(22 cards)
diurnal
events that occur during the day
nocturnal
events that occur during night
diel
events that occur with a 24 hr periodicity
diel vertical migration (DVM)
generally upward migration at dusk and downward migration at dawn
hard bottom benthos
non-living rock or biologically derived hard substrates
soft bottom benthos
organisms associated with sand or mud
infauna
soft bottom, organisms that live within the sediments beneath the sediment-water interface
epifauna
soft bottom, organisms that live on top of the sediment surface
microfauna
<0.1mm
meiofauna
0.1mm-1.0mm
macrofauna
> 1.0mm
Bernoulli’s Principle
pressure and velocity are inversely related
advection
active process
diffusion
passive process
trophic amensalism hypothesis
the reason why you don’t find suspension feeders and deposit feeders together
swallowers
swallowing sediments, little selectivity
tentacular feeders
use tentacles to trap particles by pressing against the substrate and transfer to the mouth
siphon feeders
vacuum sediments into themselves, above or within the sediment
coprophagy
consumption of fecal material, may appear to be a poor strategy but pellets become colonized by bacteria in 1-2 days
alleopathy
the harmful effect of one organism on another caused by the release of chemical compounds produced by the first
alternative stable states
existence in the same area of different groups of organisms or patches of organisms, result when some factor or set of factors disturb the dominant species, causing the community to switch to a new composition, which remains stable during the disturbance
kelp forests
subtidal communities in ares of strong currents and heavy surf
