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

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November 1965, and from March to November 1966. Stations of the
B and D transects were not sampled after June 1966.
Patterns of reproduction of Pontoporeia were studied by examination of brooding and spent females and by analysis of the size frequency
of amphipod populations from various depth zones. The environmental
parameters, sediment type, percent organic carbon in the sediment,
water temperature, distance from shore, wave height, and depth were
chosen as environmental factors likely to affect the abundance and
distribution of Pontoporeia. These variables were measured and recorded
at each benthic sampling station.
The second study area, called the short-term study area, was
located near Mona Lake approximately 6, 000 feet from shore at a depth
of 56 feet (Fig. 2). Eighty-eight benthos samples were collected at two
adjacent 15 x 15 ft. areas 13-14 June 1967. These samples were used
to determine the small-scale patterns of Pontoporeia distribution and to
examine the microassociation of Pontoporeia and the other macrobenthic
organisms.