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Biosphere 2 Marine AlgaeBrandon Fergusson
Experiment
• Study effects of increasing atmospheric CO2 on marine organisms
Biosphere2 Ocean
Biosphere2 Ocean
Algae Data
• Over 60 species present
• Sampled almost monthly– Biomass per species
• Physical data every 15 minutes– Light
– CO2
• January 1998 – February 2003
Data Considered
• Total algae biomass
• Amphiroa fragillissima biomass
• Velonia aegagropila biomass
• Outside light
• Inside CO2
Total Algae Biomass, CO2, and Light (Jan '98 - Feb '03)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
0 10 20 30 40 50 60 70
Months
Total Algae Biomass Avg Monthly CO2 Avg Monthly Max Light
2000 Algae, CO2, and Light
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
0 50 100 150 200 250 300 350 400
Julian Days
Total Algae Biomass Avg Daily CO2 Max Daily Light
Standardized Data Jan '98 - Feb '03
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 10 20 30 40 50 60 70
Months
Amphiroa fragillissima CO2 Light
Standardized Data Jan '98 - Feb '03
0
1
2
3
4
5
6
0 10 20 30 40 50 60 70
Months
Velonia aegagropila CO2 Light
Correlations
Light CO2
Sample size (n) Correlation (r) Sample size (n) Correlation (r)
Total Algae 20 0.223 23 -0.041
A. fragillissima 20 0.391 23 -0.373
V. aegagropila 13 0.014 16 -0.013
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