Product: 42a16f5a-ba4c-42e6-bed3-37d6dcc1e853

Metadata Format
Product Title
Seasonal cues of Arctic grayling movement in a small Arctic stream: the importance of surface water connectivity
Description
Study tracking grayling fish movement in Crea Creek on the Arctic Coastal Plain, Alaska to identify winter habitat
Project ID
2ce83999-df5e-4f43-83ba-531250f1db10
Project Title
FishCAFE: Response of an Arctic Freshwater Ecosystem to Climate and Land-use Change
Point of Contact(s)
LCC Network Data Steward
LCC Network Data Manager
lccdatasteward@fws.gov
Arctic Landscape Conservation Cooperative
U.S. Fish & Wildlife Service
1011 E. Tudor Rd
Anchorage, Alaska 99503
V: +1 907 7863532
staff@arcticlcc.org
http://arcticlcc.org
Arctic Landscape Conservation Cooperative
U.S. Fish & Wildlife Service
1011 E. Tudor Rd
Anchorage, Alaska 99503
V: +1 907 7863532
staff@arcticlcc.org
http://arcticlcc.org

Product Abstract

In Arctic ecosystems, freshwater fish migrate seasonally between productive shallow water habitats that freeze in winter and deep overwinter refuge in rivers and lakes. How these movements relate to seasonal hydrology is not well understood.We used passive integrated transponder tags and stream wide antennae to track 1035 Arctic grayling in Crea Creek, a seasonally flowing beaded stream on the Arctic Coastal Plain, Alaska. Migration of juvenile and adult fish into Crea Creek peaked in June immediately after ice break-up in the stream. Fish that entered the stream during periods of high flow and cold stream temperature traveled farther upstream than those entering during periods of lower flow and warmer temperature. We used generalized linear models to relate migration of adult and juvenile fish out of Crea Creek to hydrology.Most adults migrated in late June – early July, and there was best support (Akaike weight = 0.46; wi) for a model indicating that the rate of migration increased with decreasing discharge. Juvenilemigration occurred in two peaks; the early peak consisted of larger juveniles and coincided with adult migration, while the later peak occurred shortly before freeze-up in September and included smaller juveniles. A model that included discharge, minimum stream temperature, year, season, and mean size of potential migrants was most strongly supported (wi = 0.86). Juvenile migration rate increased sharply as daily minimum stream temperature decreased, suggesting fish respond to impending freeze-up. We found fish movements to be intimately tied to the strong seasonality of discharge and temperature, and demonstrate the importance of small stream connectivity for migratory Arctic grayling during the entire open-water period. The ongoing and anticipated effects of climate change and petroleum development on Arctic hydrology (e.g. reduced stream connectivity, earlier peak flows, increased evapotranspiration) have important implications for Arctic freshwater ecosystems.

Purpose:

Product Links

Product Keywords

  • ISO 19115 Topic Category (isoTopicCategory):
    • biota,
    • environment,
    • inlandWaters
  • Global Change Master Directory (GCMD) Science Keywords (project):
    • PERMAFROST,
    • LAKES,
    • WETLANDS,
    • RIVER ICE,
    • ECOSYSTEM FUNCTIONS,
    • LAKE ICE
  • End User Types - Landscape Conservation Cooperatives (LCC End User Type):
    • Federal resource managers,
    • Academics & scientific researchers

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