expedition on 5 lakes of nelijärve 5 august 2015 giraffes
TRANSCRIPT
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Expedition on 5 lakes of Nelijärve
5 August 2015Giraffes
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• Silver Tatrik• Pille-Riin Karuse• Katarina Keerd• Jaroslav Bortsov• Triin Tetsmann• Ketlin Timusk• Kirill Lobossok• Viktoria Popova• Alina Granich• Nataliya Lobosok• Eimante Pundziute• Migle Simanaviciene• Helve Orusalu
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Research questions
•Why is lake Purgatsi so green?•Why is there algal bloom?•Is the water full of nutrients?•Is the water chemistry of the five lakes similar?
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Research aim
• Investigating water chemistry of five Nelijärve lakes
Hypothesis: All the five lakes have similar water.All the five lakes have algal bloom.
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Material and methodology
• Water analyses were taken on 5 August 2015 from10 am to 1 pm
Investigations and equipment:• Temperature - Water thermometre (ethanol)• Phosphates, nitrates, ammonium - Aquanal Ökotest Water Laboratory• Hardness - Visocolor HE Gesamthärte H 20 F• Conductivity - Milwaukee electrical conductivity meter• Dissolved oxygen - Visocolor HE Sauerstoff SA 10• pH - Martini instruments pH meter• Colour - visually
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The lakes
• Purgatsi• Ahvenajärv• Linajärv• Sisalikujärv• Urbukse
All of them are seepage lakes – no inflow or outflow, feed mainly on precipitation and ground water.
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Urbukse
Sisaliku
Ahvena
Linajärv
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Compared properties
• Temperature• Colour• Dissolved oxygen• Conductivity• pH• Amount of ammonium, nitrates and phosphates• Hardness
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Work
MethodsResults
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Urbukse Ahvena Linajärv Sisaliku Purgatsi15.5
16
16.5
17
17.5
18
18.5
19
19.5
20
20.5Temperature (°C)
Temperature
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Ahvena Linajärv Urbukse Sisaliku Purgatsi0
2
4
6
8
10
12
Dissolved oxygen (mg/l)
Dissolved oxygen (mg/l)
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Colour of the lake
• Purgatsi: green• Sisaliku: green/brown• Urbukse: green• Ahvena: brown• Linajärv: brown
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Purgatsi Urbukse Sisaliku Ahvena Linajärv0
2
4
6
8
10
12
pH
Series 1
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Phosphates
The key nutrient affecting the amount of algae and weed growth
Also important for plant growth
Key indicator of pollution
Nitrates
Ammonium
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Very soft water (0,5 mmol/l or less) => few mineralsConductivity very low (7-30 µS)
Linajärv Ahvena Urbuksi Sisaliku Purgatsi0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
Water hardness (mmol/l)
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Conclusions
• Lakes are green because of algal blooming (blue-green algae)• There is algal bloom because of enough nutrients • High levels of nutrients were not found• The 5 lakes are similar: very soft water, low conductivity, no
phosphates found, low level of nitrates and ammonium. • pH different – 6,5 - 10• Lake Linajärv is surrounded by peat moss, it`s the most different lake
(brown clear acidic water, no algal bloom)
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Discussion
• The five investigated lakes are endangered because they have very soft water, low level of minerals. • They used to be oligotrophic lakes but now they might be changing
(eutrophication, algal bloom)• Very deep conclusions not possible – not enough data, test kits not
sensitive enough
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Animals we met
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Thank you!