Knowledge Tree
Dolly Varden
Facts (11)
Sources
A review of climate change impacts on migration patterns of marine ... frontiersin.org Oct 25, 2024 11 facts
claimThe increasing loss of coastal ice during summer has negatively impacted Dolly Varden harvests because the presence of drifting ice typically improves fish catches, according to research by Brewster et al. (2016) and WMAC and Aklavik HTC (2018).
claimArctic char and Dolly Varden track their preferred temperature isopleths in the ocean, which can shift spatially from year to year, altering their marine distribution.
claimDolly Varden feed at an oceanographic front in the Chukchi Sea where euphausiid abundance is high.
claimThe nearshore habitat-use and marine spatial distribution of Dolly Varden are influenced by sea surface temperature (SST) and ice conditions.
referenceM. B. Courtney, B. S. Scanlon, A. H. Rikardsen, and A. C. Seitz studied the marine behavior and dispersal of Dolly Varden, an important subsistence fish in Arctic Alaska, in a 2016 publication.
claimThe marine dispersal of Dolly Varden (Salvelinus malma) is limited by the extent of sea-ice during the summer.
claimDolly Varden (Salvelinus malma) enter the ocean after land-fast ice breaks up, and their marine dispersal is limited by the extent of sea-ice in the summer.
measurementArctic char and Dolly Varden in Arctic North America are surface-oriented species that typically occupy depths of less than 5 meters and prefer water temperatures between approximately 2°C and 8°C.
claimClimate change effects on fisheries for Arctic char and Dolly Varden during the open water season raise concerns regarding altered marine habitat use, diet changes affecting flesh quality, exposure to contaminants, and interactions with non-endemic species.
referenceBond and Quinn (2013) analyzed patterns and influences on Dolly Varden migratory timing in the Chignik Lakes, Alaska, and compared populations throughout the northeastern Pacific and Arctic oceans, as published in the Canadian Journal of Fisheries and Aquatic Sciences.
claimDolly Varden often occupy nearshore habitats in years with cooler sea surface temperatures (SSTs) but use more offshore areas in years with warmer sea surface temperatures.