Habitat Modification and Disturbance Flashcards
Habitat disturbances definition
loss or modification of essential habitat for each life stage
does habitat use change with every life stage
yes
What does ontegenic shifts in habitat use mean
habitat use changes with different life stages
water diversion
surface and ground water diverted from its natural course for anthropegenic use
exaples of water diversion
irrigation of cropland
hydrodamn
Wells
What are the affects on damns
reduce flow
barrier to movement
change in thermal regieme
accumulation of contaminents
individual
one fish
population
many fish of one type
community
fish and its surrounding habitat and critters
diadromous
migrate from freshwater to marine water
anadromous
born in freshwater
grow in marine
freshwater to spawn
Semelparis
spawn once and die
catadromous
born in marine
grow in freshwater
what are the potential impacts of damns on populations of anadromous salmon
can’t go back to spawn
less population growth
riparian habtiat
ecotone between lake or stream and upland zone
what is the purpose of riparian habitats
act as a buffer or filter as to what will go in the river
riparian habitat disturbance =
increased sediment loads
Change in temp
siltation of habitats
reduced heterogeneity
eutrophocation
how can an increase in nutrient loads following the removal of riparian vegitation influence the life history of fish
more nutrient loads = eutrophication
Eutrophication =less o2= less resources = not balanced growth maintenence reproduction
habitat reduction bc oof increased sediment
what will a nutrient load do to a water body
eutrophication
structural complexity
many diff habitats
What do you think connectivity means in the context of habitat use and fish movements
habitat use changes with diff life stages
ontogenetic shifts in habitat use
impacts water quality
disturbance or loss of any essential growth recriutment reproduction survival
