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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 126


126    Wisconsin Academy of Sciences, Arts, and Letters.
as well as the bryozoan Pluma~tella polymorpha. Elodea is used
by Physa sayii, Bythinia tentacuilata and Planorbis parvus among
snails, and by Anax juniuks, Enallagma, and other insects. The
Potamogeton leaves serve as a resting place or foraging ground
for many mollusks and associated animals. Vallisneria, with its
long, narrow leaves, is a favorite resort of Amnicola and young
Lymnaea and Planorbis.
  But over and above all the filamentous algae are the great forag-
ing grounds of both mollusks and associated animals. Algae, in
many places, cover all upright plants like a huge blanket (hence
often called blanket algae) and among them many animals occur
in great abundance. No less than 19 higher groups of animals
have representatives that live among the tangled masses of Clado-
phora. Planaria maculata, leaches of several species, Glossiphonia
fusca, stagnalis, complanata, nepheloidea, Dina fervida, and Oli-
gochaete worms, Stylaria, are at times very abundant; minute
Cladocera of several species are common; the Amphipod, Byalella
knicikerbockeri, is the most abundant animal and with this is asso-
ciated the Isopod, Asellus intermedius; among Ephemerids, Caenis
is common; the nymphs of Corixa, Belostoma, Notonecta, and Plea
striola are more or less abundant, with adults of Plea and Ranatra
fusca; Trichoptera larvae, including Agraylea, Hydropsyche,
Oecetis, Leptocella, Phryganea, Polycentropidae, and a few Helico-
psyche, are common or abundant; Chironomids, next to Hyalella,
are the most abundant, their larvae and pupae occurring in count-
less numbers in the mass of algae; Coleoptera include Bidessus
affinis and B. flavicollis, as well as the larvae of Dytiscids and
Dascyllidae; the mites (Acarina) are the best represented as re-
gards genera, of which eleven have been identified, including
Limnesia, Hydrachna (common), Tayas, Piona (not common),
Hygrobates, Lebertia porosa, Torrenticola, Limnesiopsis, Eylais,
Unionicola, and Arrhenurus (rare).
  Nearly all aquatic mollusks frequent algal communities. By-
thinia, young Amnicola, Valvata, and Planorbis, especially the
smaller species, browse among the stringy filaments. As already
noted in Oneida Lake (Baker 1918, p. 158) some species live in a
plant habitat when young and later migrate to a different kind of
a habitat. Pleurocera acuta when young is found in algae but
later migrates to the boulder or gravel shores, where algal food
may be gleaned from rocks. Lymnaea winnebagoensis also lives
in algae when young and later occupies a sand, gravel or boulder


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