Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.
Locally Migrant: Yes. At least some populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: No. No populations of this species make annual migrations of over 200 km.
In Vermont, softshells migrated about 3 km between riverine wintering sites and river mouth nesting sites near Lake Champlain; migratory movements were most extensive in spring and late summer (Graham and Graham 1997).
In northern Lake Champlain, Quebec-Vermont, annual home range size was 1.8-110.3 (mean 32.1) sq km in 11 females and 0.4-6.9 (mean 2.8) sq km in 4 males; linear home range size was 5.6-25.0 (mean 13.7) km in females and 1.4-6.3 (mean 3.9) km in males (Galois et al. 2002). Usually the distance between the two most distant points for an individual reflected the distance between spring-summer and fall-winter activity centers (Galois et al. 2002). A female in that area nested more than 30 km from its wintering area (Daigle et al. 2002).
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