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The jumping mouse also is limited in its distribution by hydrosere communities, not by forests.

Vagrant shrews, then as now, probably depended on hydrosere communities, while red squirrels required trees.

Sorex palustris is tied closely in its distribution to hydrosere communities and is not dependent upon the presence of forests.

Most of the valleys are in the Transition Life-zone; the forests are rather dry and of pine with more or less isolated hydrosere communities about streams and ponds.

These hydrosere situations are the habitat of Sorex vagrans.