Frequency Distribution of Individual Body Weights
And Cumulative Biomass, Lake Huron
Station 15, Summer 1998
mg/Individual
0
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10
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35
40
Frequency
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100
200
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400
500
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Cumulative Biomass (mg/m3)
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Individuals to right of bar > 1mm in length
Individuals to left of bar < 1 mm in length
As with lengths, most individuals are small, but most community biomass is concentrated in larger individuals.  In this graph, cumulative biomass doesn’t quite reach total biomass at site (41.2 mg/m3) because to include it would have extended scale of X axis way out to accommodate a few huge individuals.
   Since there isn’t a strict relationship between length and biomass (it’s species specific), some individuals in dark orange rectangle are less than 1 mm, some are more than 1mm.