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Climate change, fishing, alter salmon abundance (photos and graphics) The images shown below are available for download. The links at the far right are to high-resolution, print-quality versions. The JPG and GIF images on this page are for reference only. If you have trouble downloading any of these images, we can e-mail them to you. Contact Carol Kaynor or Doug Schneider for assistance. |
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This bottom sediment core, taken from an Alaska lake, will yield important information about past salmon runs that may help fishery managers predict the impact of future climate changes on salmon returns. (Photo by Jon Sweetman, UAF Institute of Marine Science.) | corehand.tif (11 MB) |
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Researchers studied past salmon returns in several lakes across Alaska, including this one, Frazer Lake, on Kodiak Island, Alaska. (Photo by Jon Sweetman, UAF Institute of Marine Science.) | corelake.tif (11 MB) |
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Bruce Finney on Becharof Lake, Bristol Bay region, with a core sampler used to take sediment cores from Alaska lake bottoms. (Photo by Jim Larson, U.S. Fish & Wildlife Service.) | coresampler.tif (4.5 MB) |
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By measuring the amount of the stable nitrogen 15 isotope within sediment layers, scientists can calculate salmon abundance going back some 300 years. Layers within the cores were dated using known events, such as volcanic eruptions, as a guide. (Photo by Jim Larson, U.S. Fish & Wildlife Service.) | coresampler2.tif (11 MB) |
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Locations of the seven Alaska lakes discussed in this study: 1, Karluk; 2,Frazer; 3, Red; 4, Akalura; 5, Ugashik; 6, Becharof; and 7, Tazimina. (Courtesy Dr. Bruce Finney, UAF Institute of Marine Science, 2000.) | Finneyfig1c.eps (1.2 MB) |
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Comparison of N15 isotope profiles from sockeye and control lakes from the Kodiak Island and Bristol Bay regions of Alaska over the past 300 years. (Courtesy Dr. Bruce Finney, UAF Institute of Marine Science, 2000.) | Finneyfig4c.tif (8.7 MB) |
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The following two images are nice but are low resolution, so may not be suitable for print. |
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A dead salmon lies on the beach of Iliamna Lake in the Bristol Bay region. Besides providing food for hungry bears, salmon that die after spawning release nutrients that nourish the next generation of salmon. Nitrogen and phosphorous, for example, are important to the growth of algae that are grazed by zooplankton, a favorite food of young salmon. (Courtesy Dr. Bruce Finney, UAF Institute of Marine Science, 2000.) | Finneycover3.tif (72 ppi, 3.6 MB) |
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Researchers suggest fishery managers might improve salmon returns by learning more about the nutrient needs of each freshwater system. By letting more salmon reach spawning grounds, and therefore putting more nutrients into the system, lakes and rivers could produce larger salmon runs. (Courtesy Dr. Bruce Finney, UAF Institute of Marine Science, 2000. Photo is of Iliamna Lake, Bristol Bay region. ) | Finneycover4.tif (72 ppi, 3.7 MB) |
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