Botany Bay Ecosystem

By Dixon Fang

Location

Botany Bay is an open, shallow bay located south of the Sydney Central Business district. The bay is in junction with two rivers, Cooks River and Georges River. Botany Bay is also located next to several landmarks such as Sydney Airport and the Kurnell Desalination Plant.

Biotic Factors

Biotic factors can include:


  • Trees (e.g Mangroves)
  • Animals (e.g Blue Swimmer Crabs)
  • Plants (e.g Strap Weed)

Abiotic Factors

Abiotic Factors can include:


  • Temperature
  • Sunlight
  • Salinity levels in water

Organisms

Organisms that can be found in Botany Bay are:


  • Prawn
  • Pygmy Squid
  • Blue Swimmer Crab
  • Silver Gull
  • Red Fingered Mud Crab
  • Black Cormorant
  • White Faced Heron
  • Sea Hare

Human Activity

Land clearing


  • Land clearing can cause species of animals to be wiped out or being threatened with extinction. It is the result of habitat destruction which animals can no longer live due to starvation, exposure or stress. Land clearing can also wipe out seagrass which can destabilise the marine ecosystem by destroying food for organisms living in the sea and destabilising the sea floor.


Fishing


  • Fishing affects the ecosystem by taking away fish and in return disrupts the food web by taking away another organism that eats fish because the organism can't have fish as its food source and becomes extinct.
Noise Pollution


  • Noise pollution is a significant impact to the ecosystem because Botany Bay is located next to Sydney Airport and is directly under the flight path of many planes that travel over, resulting in frequent loud noise disruptions. This can affect birds as they rely on noise for mating and will have to compete with the noise pollution produced by airplanes.

Two Organisms

Blue Swimmer Crab

Scientific Name


  • Portunus Pelagicus


Habitat


  • Blue Swimmer crabs live in bays, estuaries and shallow coastal waters for up to 50m. They prefer to live in sandy areas and prefer high tides if they live in estuaries.


Diet


  • Blue Swimmer crabs are aggressive predators and scavengers. They feed on molluscs, worms, crustaceans, small fish, dead fish, algae and seagrass.
Big image

Southern Pygmy Squid

Scientific Name

  • Idiosepius Notoides
Habitat

  • Southern Pygmy squids live in shallow and inshore waters. They also tend to live in seagrass beds.
Diet

  • They feed on small crustaceans, shrimp and fish.

Big image

Adaptations

Blue Swimmer Crab

Blue Swimmer crabs have flat rear legs.All the other legs are sharp. The flat rear legs help to swim faster and the sharp legs help to dig into the sea floor. These crabs have strong sharp pincers to catch fish and other creatures.


The rear legs can also help to escape predators and by using sharp legs, it can burrow into the seafloor to hide itself from predators and to ambush other prey.

Southern Pygmy Squid

The Southern Pygmy squid has tiny circular fins to help it float across the seafloor. When it is floating, it has long tentacles extending beyond its short arms to catch any shrimps along the way. It also has dark spots and yellow skin to camouflage itself from predators as it can't move very fast and its yellow skin and dark spots help to camouflage in sand, reefs and rubble.

Food web

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Discussion

I think that the resources that I used for research were very reliable because the websites I used were from an official source such as a government, museum and education websites. These were credible websites as they contained information that was recent and were written by someone who had a degree, such as education websites or written by someone who worked for the government as an official website. The websites were cross-referenced and found there were similar information between them.

Bibliography

Botany Bay | NSW Environment & Heritage. 2016. Botany Bay | NSW Environment & Heritage. [ONLINE] Available at:http://www.environment.nsw.gov.au/beach/ar0708/botanybay.htm. [Accessed 15 September 2016].

The Kurnell Peninsula - Botany Bay National Park. 2016. The Kurnell Peninsula - Botany Bay National Park. [ONLINE] Available at:http://ssec.org.au/our_environment/our_bioregion/kurnell/environment/botany_bay_np.htm. [Accessed 15 September 2016].

Bush Heritage Australia - Land Clearing & Its Impacts . 2016. Bush Heritage Australia - Land Clearing & Its Impacts . [ONLINE] Available at:http://www.bushheritage.org.au/about/about-us/our-challenge/land-clearing. [Accessed 15 September 2016].

What Happens When Something in a Food Chain Goes Extinct? | Education - Seattle PI. 2016. What Happens When Something in a Food Chain Goes Extinct? | Education - Seattle PI. [ONLINE] Available at: http://education.seattlepi.com/happens-something-food-chain-goes-extinct-4656.html. [Accessed 15 September 2016].

Southern Pygmy Squid – Idiosepius notoides Berry, 1921 - Australian Museum. 2016. Southern Pygmy Squid – Idiosepius notoides Berry, 1921 - Australian Museum. [ONLINE] Available at:http://australianmuseum.net.au/southern-pygmy-squid-idiosepius-notoides-berry-1921. [Accessed 15 September 2016].

Swimming crabs - Queensland Museum . 2016. Swimming crabs - Queensland Museum . [ONLINE] Available at:http://www.qm.qld.gov.au/Find+out+about/Behind+the+Scenes/Museum+Experts/Biodiversity/Swimming+crabs#.V9kBVih97IU. [Accessed 15 September 2016].