Ecology of the burrowing amphipod, Pontoporeia affinis, in Lake Michigan / by Wayne Paul Alley.

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13 Size frequency histograms of Pontoporeia affinis
collected at station C-3 for the 1965 and 1966
sampling seasons.. o............ 37- 38
14 Size frequency histograms of Pontoporeia affinis
collected at station C-4 for the 1965 and 1966
sampling seasons.................. 39-40
15 Size frequency histograms of Pontoporeia affinis
collected at station C-5 for the 1965 and 1966
sampling seasons................. 41-42
16 The variance-mean relationship of juvenile
Pontoporeia affinisr-2 mtn in length per
quadrat, from the short-term study area... 44
17 The variance-mean relationship of juvenile
Pontoporeia affinis, —.7 mm in length per
quadrat, from the short-term study area...... 45
18 The variance-mean relationship of the total
number of juvenile Pontoporeia affinis of the
short-term study area................. 46
19 The occurrence frequency histogram of
Pontoporeia affinis,n-2 mm in length per
quadrat, of the short-term study area superimposed on a normal distribution curve with
the same mean and variance......... 47
20 The occurrence frequency histogram of
Pontoporeia affinis,- 9 -7 mm in length per quadrat,
of the short-term study area superimposed on a
Poisson series with the same mean...... 48
21 The occurrence frequency histogram of the total
number of juvenile Pontoporeia affinis of the
short-term study area superimposed on a normal
distribution curve with the same mean and variance. 49

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