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Hong Kong Student Science Project Competition 2007
Homemade EcosphereBy
Ho Fung College
Chan Hei Ting SHEERALo Tin Long KYAN
Lau Hiu Ching TRACY
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Commercial
Our “ecosphere”
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Why did we design an Ecosphere?
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Glass/Plastic Bottle
Duckweeds (Producer)
Decayed leaf (Dead organic matter)Stream water
Snail (Consumer)
Shrimp (Consumer)
Algae (Producer)
Bacteria (Decomposer)
ECOSPHERE: Our Set Up
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Algae & Duckweeds
Algae
Duckweeds
Algae
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Shrimps & Snails
Shrimp
Shrimp
Large Stream Snail
Large Stream Snail
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Semi-decayed leaf
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Bacterial Culture
Collect solution from ecosphere Transfer solution to a beaker
Gently daub on agar plate Appearance of bacteria after incubation for 3 days
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5 areas of investigation
•Population of consumers•Amount of duckweed•Air-to-water ratio •Size of Bottle•Light Intensity
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Population of consumers
1. Effect of the population of the consumers in ecosphere
0%
20%
40%
60%
80%
100%
120%
1 shrimp + 0
snail
2 shrimp + 0
snail
3 shrimp + 0
snail
4 shrimp + 0
snail
% survive after1 week
Data 1
* The dead shrimps are removed
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Population of consumers
Effect of the population of the consumers in ecosphere
0%
20%
40%
60%
80%
100%
120%
1 shrimp+ 0 snail
1 shrimp+ 2 snails
1 shrimp+ 4 snails
1 shrimp+ 6 snails
1 shrimp+ 8 snails
% survive after1 week
Data 2
* The dead shrimps are removed
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1 Shrimp + 2 Snails / 1 shrimp + 0 Snail
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Amount of duckweeds
0
5
10
15
20
50% coveredwater surface
100% coveredwater surface
200% coveredwater surface
Effect of the amount of duckweeds
1 shrimp + 2 SnailsData 3
>15 days
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Duckweed (100% covering water surface)
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Air-to-water ratio
0
5
10
15
Day
s of s
urvi
val
0.5:1.5 1:01:00 0.65:1.35 1.5:0.5
Effect of Ratio of air to water in ecosphere
1 shrimp + 2 Snails
Data 4
>14 Days
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Air-to-water ratio=1:3
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Size of Bottle
0
5
10
15
Day
s of s
urvi
val
2L 1.5L 0.75L
Size of bottle> 15 Days
1 shrimp + 2 Snails
Data 5
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The bigger the bottle, the longer
the ecosphere survives.
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Light intensity
0
5
10
15
Direct sunlight Diffused sunlight Dim light indoors
Light intensity
> 15 Days
1 shrimp + 2 Snails
Data 6
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Diffused sunlight
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ImprovementWhy do we add the land environment? To make it more close to the nature !!
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NEW Set Up
• Glass bottle of 6 Liters • Land: water: air Ratio= 1:3:1• Inner container • Garden soil • Small plants • Small animals
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Organisms
Water: duckweeds, algae, shrimps, pond snails
Land: snail, slug, earthworm,millipede
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Main concepts
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Interesting Video
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References
www.eco-sphere.com/ www.abundantearth.com/store/ecosphere.htmlwww.en.wikipedia.org/wiki/Ecospherewww.watersavers.com/docs/otherwatersaver_ecos_ball.shtmlwww.ecospherics.net/pages/MosqEcoFun5.htmlwww.open2.net/diyscience/ecospherewww.trendhunter.com/trends/ecosphere-self-contained-ecosystems
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