Ecology- habitat and way of life Flashcards
Ecosystem
encompasses all biota and abiota
biota
all living organisms
abiota
chemical properties & physical properties
ecology
study of the relationship between organisms and their environment
abiotic factors: chemical factors
- nutrients
2. salt content (amount)
abiotic factors: physical factors
- pressure
- depth
- current
- waves
- light
- sediment
- tide
abiotic factors have an influence on organisms how?
- activity
- reproduction
- distribution
osmosis
diffusion of h2O through a semi-permeable membrane (in order to reach homeostasis)
hypertonic solution
when there is a higher concentration, so water leaves the cell
hypotonic solution
when there is a lower concentration, so water enters the cell
marine fish salt content compared to their environment
less salt than their environment
fresh water fish salt content compared to their environment
saltier than their environment
how do marine fish counteract the osmotic diffusion of water out of their cells?
- body fluids are less salty than water
- osmotic water loss
- drinks sea water
- salt excretion by gills
- low urine production by the kidneys
how do fresh water fish counteract the osmotic diffusion of water out of their cells?
- not drinking water
- urinate frequently
- absorbs salt ions through chloride cells in the gills
- bodily fluids more salty than water
- osmotic water gain
effect of light on PP: photic zone
enough light for photosynthesis
effect of light on PP: schemerzone (mesopalegic zone)
little light, no photosynthesis
effect of light on PP: aphotic zone
no light
habitat
place within an ecosystem where an organism or a community of organisms lives, including all living and nonliving factors or conditions of the surrounding environment.
benthic zone
sea floor