How many animals are there? CALCULATIONS
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BENTHIC FAUNA CALCULATIONS
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mm^2log(#)/m^2#/m^2
# over all of earth
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% of earth's surface occuring at a given depthDepth
Mean depth
Total ocean floor area
logMeiofauna
logMacrofauna
lMegafauna
Meiofauna
Macrofauna
Megafauna
Total Meiofauna
Total Macrofauna
Total Megafauna
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8.50-10005004.34E+135.613.407-0.43407,380.282,552.700.371.77E+191.11E+171.61E+13
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31000-200015001.53E+135.543.127-0.8348,337.321,339.680.165.33E+182.05E+162.42E+12
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4.82000-300025002.45E+135.472.847-1.17297,851.64703.070.077.30E+181.72E+161.66E+12
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13.83000-400035007.04E+135.412.567-1.54254,683.03368.980.031.79E+192.60E+162.03E+12
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23.24000-500045001.18E+145.342.287-1.91217,770.98193.640.012.57E+192.28E+161.45E+12
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16.45000-600055008.37E+135.272.007-2.28186,208.71101.620.011.56E+198.51E+154.39E+11
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16000-700065005.10E+125.201.727-2.65159,220.8753.330.008.12E+172.72E+141.14E+10
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NUMBER OF NEMATODES CALCULATION
Totals=9.03E+192.06E+172.41E+139.05E+19
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5.00E+06
Nematodes / square meter in marine and terrestrial soil
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1.97E+08
Square miles of earth's surface
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5.10E+14
Square meters of earth's surface
3.08E+13
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2.55E+21
Total number of nematodes on earth's surface
1.09E+13
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1.74E+13
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NUMBER OF INSECTS CALCULATION
4.99E+13
5.644 – 0.000068X
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57,308,738
Land area of earth, miles^2
8.40E+13
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36,677,592,320
Land area of earth, acres
5.94E+13
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4.00E+07
Insects / acre, suggested
3.62E+12
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1.47E+18
Total number of insects
0.00E+00
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ARTHROPODS IN TREE CANOPY CALCULATION
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3421
cm^2 found to be the surface area in the 0.7 m^3 sample areas of leaf canopy used.
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3.421
m2 surface area in 0.7 m^3 of leaves
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individuals / m^2 of leaves
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166.1628571individuals / m^3
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Average crown diameter of a rainforest tree appears to be 17.5 m. Assuming leaf volume is roughly spherical and has the same leaf density as the sample sections, that's a volume of
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2806
m3 leaf volume / tree
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4.66E+05
Arthropods on the leaves of a single tree
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1.30E+12
Tropical / subtropical trees in the world
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6.06E+17
Arthropods on all the tropical / subtropical trees
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0.43
fraction of trees that are tropical / subtropical
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1.41E+18
theoretical number of canopy arthropods if all trees were like subtropical trees
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The best estimate is probably somewhere between the 6.06E19 and 1.41E20 number.
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ZOOPLANKTON CALCULATION
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Eyeballing off of chart: average individual zooplankton / m^-3
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3.61E+08
Surface area of earth's oceans, km^2
http://www.universetoday.com/25756/surface-area-of-the-earth/
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3.61E+14
Surface area of earth's oceans, m^2
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80
Depth of euphotic zone, meters
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5.78E+17
Zooplankton in the first 80 meters of the earth's oceans
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ANIMALS IN SOIL CALCULATION
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1.28E+16
Animals in the top 8 cm of soil in Great Britain
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80,823
Area of Great Britain, miles^2
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57,308,738
Land area of earth, miles^2
http://www.universetoday.com/25756/surface-area-of-the-earth/
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9.08E+18
Animals in the top 8 cm of soil on the land area of earth
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