Transcript 1 shrimp + 2 Snails

Hong Kong Student Science
Project Competition 2007
Homemade Ecosphere
By
Ho Fung College
Chan Hei Ting SHEERA
Lo Tin Long KYAN
Lau Hiu Ching TRACY
Commercial
Our “ecosphere”
Why did we design an Ecosphere?
ECOSPHERE: Our Set Up
Glass/Plastic Bottle
Duckweeds (Producer)
Decayed leaf (Dead organic matter)
Stream water
Snail (Consumer)
Shrimp (Consumer)
Algae (Producer)
Bacteria (Decomposer)
Algae & Duckweeds
Duckweeds
Algae
Algae
Shrimps & Snails
Large Stream Snail
Shrimp
Large Stream Snail
Shrimp
Semi-decayed leaf
Bacterial Culture
Collect solution from ecosphere
Appearance of bacteria after
incubation for 3 days
Transfer solution to a beaker
Gently daub on agar plate
5 areas of investigation
• Population of consumers
• Amount of duckweed
• Air-to-water ratio
• Size of Bottle
• Light Intensity
Population of consumers
Data 1
1. Effect of the population of the consumers in ecosphere
120%
100%
80%
% survive after
1 week
60%
40%
20%
0%
1 shrimp + 0
snail
2 shrimp + 0
snail
＊ The dead shrimps are removed
3 shrimp + 0
snail
4 shrimp + 0
snail
Population of consumers
Data 2
Effect of the population of the consumers in ecosphere
120%
100%
80%
60%
% survive after
1 week
40%
20%
0%
1 shrimp 1 shrimp 1 shrimp 1 shrimp 1 shrimp
+ 0 snail + 2 snails + 4 snails + 6 snails + 8 snails
＊ The dead shrimps are removed
1 Shrimp + 2 Snails /
1 shrimp + 0 Snail
Amount of duckweeds
Data 3
1 shrimp + 2 Snails
Effect of the amount of duckweeds
>15 days
20
15
10
5
0
50% covered
water surface
100% covered
water surface
200% covered
water surface
Duckweed
(100% covering
water surface)
Air-to-water ratio
Data 4
1 shrimp + 2 Snails
Effect of Ratio of air to water in ecosphere
>14 Days
Days of survival
15
10
5
0
0.5:1.5
1:01:00
0.65:1.35
1.5:0.5
Air-to-water
ratio=1:3
Size of Bottle
1 shrimp + 2 Snails
Data 5
Size of bottle
> 15 Days
Days of survival
15
10
5
0
2L
1.5L
0.75L
The bigger
the bottle, the longer
the ecosphere
survives.
Light intensity
Data 6
1 shrimp + 2 Snails
> 15 Days
Diffused sunlight
Improvement
Why do we add the land environment?
To make it more close to the nature !!
NEW Set Up
•
•
•
•
•
•
Glass bottle of 6 Liters
Land: water: air Ratio= 1:3:1
Inner container
Garden soil
Small plants
Small animals
Organisms
 Water: duckweeds, algae,
shrimps, pond snails
 Land: snail, slug,
earthworm,millipede
Main concepts
Interesting Video
References
www.eco-sphere.com/
www.abundantearth.com/store/ecosphere.html
www.en.wikipedia.org/wiki/Ecosphere
www.watersavers.com/docs/otherwatersaver_ecos_ball.shtml
www.ecospherics.net/pages/MosqEcoFun5.html
www.open2.net/diyscience/ecosphere
www.trendhunter.com/trends/ecosphere-self-containedecosystems