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Juday, Chancey (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXI (1924)

Baker, Frank Collins
The fauna of the Lake Winnebago region,   pp. [109]-146 PDF (11.3 MB)

Page 125

Baker-The Fauna of The Lake Winnebago Region.       125
  The aquatic flora may be divided broadly into two groups,
emergent and submerged. These may be differentiated as follows:
           Emergent                       Submerged
Zizania aquatica                Valtisneria spiralis
Scirpus vatidus                 Elodea canadensis
Scirpus occidentalis            -Ceratophyllum demersum
Castalia odorata                Myriophyllum verticillatum
Nymphaea advena                 Potamogeton pectinatu's
Lemna -trisulca                 Potamogeton richardsoni
Potamogeton natans              Potamogeton zosterifolius
                                Potamogetom lucens
  No attempt was made to obtain a list of all the species of aquatic
plants, only the common and conspicuous ones being included. The
lake offers a wide field for botanists and a complete list of the flora
would be quite extensive.
  Animal life was four times as abundant in vegetation as on the
sand bottom areas, which was the richest region of the bottom
areas. The number of species represented, however, was'not as
great (sand 40, vegetation 25). Among mollusks, four species
make up 91 per cent of the total population, Amnicola limosa
-orata Bper cent, Vatvata &icarnta-a48 per cent, Rhpsa sayji I3
per cent, and Planorbis parvus 9 per cent. Among associated ani-
mals, which are more than four times as abundant in individuals
as the mollusks, three groups make up 87 per cent of the entire
population; Hyalella knickerbockeri 41 per cent, Chironomid
larvae 31 per cent and Oligachaete worms 15 per cent.
  Several animals prefer certain species of plants as a habitat.
Thus the broad leaves of Nymphaea and Castalia, principally on
the under side, are tenanted by Physa sayii, Planorbis parvus,
Planorbis antrosus, Planorbis campanulatus, Amnicola limosa
porata, Amnicola walkeri, Valvata tricarinata, young Bythinia
tentaculata, and Lymnaea winnebagoensis. Among associated ani-
mals such species as. Donacia proxima, Planaria maculata, the
larvae of Nymphula, and the eggs of Donacia and Gyrinus are
common. Some Hyalella are always found on these leaves. Scirpus
is the natural home of Ferrissia parallela and Bythinia tentaculata,

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