Seasonal Movement and Habitat Use by Subadult Bull Trout in the Upper Flathead River System, Montana

2005 ◽  
Vol 25 (3) ◽  
pp. 797-810 ◽  
Author(s):  
Clint C. Muhlfeld ◽  
Brian Marotz
Keyword(s):  
Habitat Use ◽  
River System ◽  
Bull Trout ◽  
Seasonal Movement ◽  
Flathead River

Winter Diel Habitat Use and Movement by Subadult Bull Trout in the Upper Flathead River, Montana

2003 ◽  
Vol 23 (1) ◽  
pp. 163-171 ◽  
Author(s):  
Clint C. Muhlfeld ◽  
Steve Glutting ◽  
Rick Hunt ◽  
Durae Daniels ◽  
Brian Marotz
Keyword(s):  
Habitat Use ◽  
Bull Trout ◽  
Flathead River ◽  
Diel Habitat Use

The crayfish Orconectes virilis: survival in a region with severe winter conditions

1968 ◽  
Vol 46 (2) ◽  
pp. 207-211 ◽  
Author(s):  
D. E. Aiken
Keyword(s):  
Physiological Response ◽  
River System ◽  
Small Degree ◽  
Winter Survival ◽  
Severe Winter ◽  
Orconectes Virilis ◽  
Gonadal Maturation ◽  
Seasonal Movement ◽  
Winter Conditions ◽  
Observed Behavior

An attempt was made to determine whether Orconectes virilis from a shallow river system in eastcentral Alberta has evolved a behavioral or physiological response which allows it to survive under the severe winter conditions of this region. From observations and experiments in the field and laboratory it was concluded that O. virilis cannot withstand even a small degree of freezing, and does not actively burrow into mud to escape the danger of freezing. The only observed behavior contributing to winter survival is a seasonal movement of mature animals to deeper water, and this is apparently associated more with gonadal maturation than with winter survival. The results from these experiments indicate that immature animals suffer a higher winter kill than do mature animals, and that winter survival of the species in any region is dependent upon the presence of habitat in which there is some water which does not freeze to the substratum at any time during the year.

scholarly journals Life histories of westslope cutthroat and bull trout in the upper Flathead River basin, Montana /

1984 ◽  
Author(s):  
Bradley B. Shepard ◽  
Patrick J. Graham ◽  
Karen L. Pratt ◽  
◽  
Keyword(s):  
River Basin ◽  
Life Histories ◽  
Bull Trout ◽  
Flathead River
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