Local eco system field trip Flashcards
What are the different abiotic factors?
water temp Air temp salt ph turbidity wind
How does water temp change?
Higher at height(smaller amount of water and more sun)
How does air temp change?
same
How does salt concentration change?
more at height, (water has evaporated in sun)
How does ph change?
more acidic, at high water mark minerals more concentrated, as more water evaportaes
How does turbidity change?
Same, could be more turbid at height
Where was ostral wing located on transect?
Higher places where water couldn’t reach. Therefore not as well anchored
Where were barnacles located on transect?
Lower levels, where water can easily cover shell
Where were neptune’s necklace and whelks found?
Lower levels (more water and food) but also at some high levels
Why were most species more abundant at lower levels?
More nutrients and food available.
What is an adaptation of the chiton?
Ability to extract metallic ions from sea for strong tongue to have strong hold and get algae easier
What are the structural adaptations of the limpet?
Assymetrical shape allows it to hang onto rocks more easily.
What are the behavioural adaptations of the limpet?
Pointed less steep side of shell to oncoming waves and steep side away to make eddy current to hold shell
Scrapes out home base and traps bubble of water to prevent drying out
What are the physiological adaptations of the limpet?
Excretes mucus trail to aid movement and make path to follow home. Tells them where they’ve eaten
Why do we estimate pop?
Helps us understand diversity of an org and observe changes and see if endangered.
What is the equation for mark release recapture?
no.originally marked
Abundance = —————————– X total no. in sample
no. recaptured
What features aid mark release recapture?
Orgs must be evenly distributed, easy to catch (but some orgs might avoid recapture)
what is the equation for quadrats?
average no. individuals per quadrat
Estimated pop=—————————————————-Xtotal area
quadrat area
What are the predators of the area?
Bream, tarwine, stingrays, Cormorant, sea gull
what are the prey?
Algae, molluscs
What are parisites in the area?
ticks and fleas on orgs
Wasp galls
Sea lice on gills of fish
What commensalism was their?
Chiton with barnacle
What mutualsims was there?
Algae on chiton for photosynthesis and better camouflage
What allelopathy was there?
Banskias and casurinas
- What were the human impacts?
Take orgs (abalone, oysters, cunjavoi for bait, spear fish, fish)
Create paths (affect root system and beach structure)
Rubbish
Cleared areas for paths, bbqs carpark, toilet
- what were the human impacts?
Wooden structures and concrete to prevent further erosion
Concrete makes soils alkaline
Too much water from showers affect plants
Take in weeds
What are future human impacts?
development, more concrete paths (to stop erosion)
More people=more rubbish, overfishing, eroson adn weeds
More bbq areas and carparking
More people from break wall as beach is stabilised
what are the impacts of the break wall?
Prevented silting of river (now stable and reasonably deep)
Stabilised ebaches
Reduced impact of floods.
