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

Journal Article · · North American Journal of Fisheries Management
DOI:https://doi.org/10.1577/M04-045.1· OSTI ID:2506830
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Abstract

Despite the importance of large-scale habitat connectivity to the threatened bull trout Salvelinus confluentus, little is known about the life history characteristics and processes influencing natural dispersal of migratory populations. We used radiotelemetry to investigate the seasonal movements and habitat use by subadult bull trout (i.e., fish that emigrated from natal streams to the river system) tracked for varying durations from 1999 to 2002 in the upper Flathead River system in northwestern Montana. Telemetry data revealed migratory (N = 32 fish) and nonmigratory (N = 35 fish) behavior, indicating variable movement patterns in the subadult phase of bull trout life history. Most migrating subadults (84%) made rapid or incremental downriver movements (mean distance, 33 km; range, 6–129 km) to lower portions of the river system and to Flathead Lake during high spring flows and as temperatures declined in the fall and winter. Bull trout subadults used complex daytime habitat throughout the upper river system, including deep runs that contained unembedded boulder and cobble substrates, pools with large woody debris, and deep lake-influenced areas of the lower river system. Our results elucidate the importance of maintaining natural connections and a diversity of complex habitats over a large spatial scale to conserve the full expression of life history traits and processes influencing the natural dispersal of bull trout populations. Managers should seek to restore and enhance critical river corridor habitat and remove migration barriers, where possible, for recovery and management programs.

Sponsoring Organization:
USDOE
OSTI ID:
2506830
Journal Information:
North American Journal of Fisheries Management, Journal Name: North American Journal of Fisheries Management Journal Issue: 3 Vol. 25; ISSN 0275-5947
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (31)

Interactions among stream fishes: predator-induced habitat shifts and larval survival journal June 1991
Quantitative measurement of food selection: A modification of the forage ratio and Ivlev's electivity index journal January 1974
Habitat utilization and diel behavior of juvenile bull trout (Salvelinus confluentus) at the onset of winter journal March 1997
Winter Habitat Utilization by Stream Resident Brook Trout (Salvelinus fontinalis) and Brown Trout (Salmo trutta) journal October 1986
Summer movements and habitat use by Colorado River cutthroat trout (Oncorhynchus clarki pleuriticus) in small, montane streams journal June 1996
Profitable stream positions for salmonids: relating specific growth rate to net energy gain journal March 1984
Seasonal and diel changes in habitat use by juvenile bull trout (Salvelinus confluentus) and cutthroat trout (Oncorhynchus clarki) in a mountain stream journal May 1998
Movements of Planted and Wild Trout in an Idaho River System journal January 1964
Trout and Salmon Movements in Two Idaho Streams as Related to Temperature, Food, Stream Flow, Cover, and Population Density journal July 1971
Winter Stream Conditions and Use of Habitat by Brook Trout in High-Elevation Wyoming Streams journal March 1987
Seasonal Changes in Microhabitat Selection by Rainbow Trout in a Small Stream journal March 1991
Notes: Spawning Behavior of Bull Trout in the Upper Flathead Drainage, Montana, with Special Reference to Hybridization with Brook Trout journal November 1994
Occurrence of Bull Trout in Naturally Fragmented Habitat Patches of Varied Size journal May 1995
Fall and Winter Movements of and Habitat Use by Cutthroat Trout in the Ram River, Alberta journal November 1995
Movements of and Habitat Use by Fluvial Bull Trout in the Blackfoot River, Montana journal September 1997
Absence of Autumnal Changes in Habitat Use and Location of Adult Colorado River Cutthroat Trout in a Small Stream journal January 1998
Role of Stream Ice on Fall and Winter Movements and Habitat Use by Bull Trout and Cutthroat Trout in Montana Headwater Streams journal March 1998
Geomorphology, Logging Roads, and the Distribution of Bull Trout Spawning in a Forested River Basin: Implications for Management and Conservation journal September 1999
Spawning Migration of Lacustrine-Adfluvial Bull Trout in a Natural Area journal September 2001
Potamodromy in SahnonidaeLiving and Moving in the Fast Lane journal November 1997
Distribution, Status, and Likely Future Trends of Bull Trout within the Columbia River and Klamath River Basins journal November 1997
Evidence to Challenge the “2% Rule” for Biotelemetry journal August 1999
Fall and Winter Habitat Use and Movement by Columbia River Redband Trout in a Small Stream in Montana journal February 2001
Seasonal Movements of Fluvial Westslope Cutthroat Trout in the Blackfoot River Drainage, Montana journal August 2001
Effective Population Size and Genetic Conservation Criteria for Bull Trout journal November 2001
Winter Diel Habitat Use and Movement by Subadult Bull Trout in the Upper Flathead River, Montana journal February 2003
Reconnecting a Fragmented River: Movements of Westslope Cutthroat Trout and Bull Trout after Transport Upstream of Milltown Dam, Montana journal August 2003
Variable Migratory Patterns of Different Adult Rainbow Trout Life History Types in a Southwest Alaska Watershed journal July 2003
Local‐Habitat, Watershed, and Biotic Features Associated with Bull Trout Occurrence in Montana Streams journal November 2003
Detection of Hybrids between Bull Trout (Salvelinus confluentus) and Brook Trout (Salvelinus fontinalis) Using PCR Primers Complementary to Interspersed Nuclear Elements journal December 2001
Metapopulation Structure of bull Trout: Influences of Physical, Biotic, and Geometrical Landscape Characteristics journal May 1999

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