Dating salmon postcards
The trend was most pronounced in populations from Alaska’s once-legendary salmon-producing rivers, such as the Kenai, Kuskokwim and Yukon, where salmon are born before migrating to the ocean and then returning at the end of their life to spawn.Although the study didn’t formally test why the largest Chinook salmon are disappearing, the authors – after considering other possibilities, such as climate change and competition between different species of salmon – believe growing populations of resident orcas in the salmon’s northern feeding ground are the most plausible cause.Chamberlain Lake Columbia Gorge Hotel Crates Point Dougs Beach Drano Lake Hood River Lyle, Washington Klickitat River Little White Salmon River Mayer State Park Memaloose Island Mount Hood Rocky Island Rowena Crest Rowena Gap Spring Creek The Dalles Wah Gwin Gwin Falls White Salmon River SNAKE RIVER CONFLUENCE | COLUMBIA PLATEAU COLUMBIA RIVER GORGE | VANCOUVER PLAINS | JOURNEY TO THE PACIFIC CAMPSITES HOME | REGIONS | PENNY POSTCARDS | MY CORPS OF DISCOVERY IMAGE INDEX | LINKS | ABOUT THIS SITE COLUMBIA RIVER IMAGES - HOME NORTHWEST JOURNEY - HOME NORTHWEST BIRDING RIDGEFIELD NWR - BIRDS COMPLETE BIRD LIST - PHOTOS THE BARLOW ROAD THE COLUMBIA RIVER HIGHWAY WILDFLOWERS and WEED BLOSSOMS All Lewis and Clark quotations from Gary Moulton editions of the Lewis and Clark Journals, University of Nebraska Press, all attempts have been made to type the quotations exactly as in the Moulton editions, however typing errors introduced by this web author cannot be ruled out; location interpretation from variety of sources, including this website author.Famed Chinook salmon are getting smaller, according to a new study analyzing 40 years of data.Often, salmon fishers – both commercial and recreational – have been blamed.However, new research raises the possibility that the story of why Chinooks are smaller is more complicated than the classic overfishing narrative, illustrating how complex conservation can become once humans throw a natural ecosystem out of balance.Authors of the , published in the journal Fish and Fisheries, suggest that increasing populations of northern resident orcas, or killer whales, are selectively eating the largest of the Chinook salmon, contributing to the fish’s shrinking average size.
Caption for this image on the Oregon Historical Society Webpage is: "Sheep at the ferry, Klickitat Landing. Caption for this image on the Oregon Historical Society Webpage is: "Sheep at the ferry, Klickitat Landing. Side has Some Snow on them at this time, more timber than above and of greater variety.
Add to that the nails which tell wood, treament, and other information, and toss in all date nails used in poles and other timbers, and the total number of different nails from this continent easily exceeds 3,500. When North American railroads began to experiment with treated ties in the second half of the 1800s, it was not known which chemicals, treament methods, or woods were most economical.
They needed some method of keeping track of the lives of ties, so like their European counterparts, they decided to mark them. By the late 1800s American railroads settled on the use of date nails.
“Now, as we look at ecosystem interactions between species, we find we’re still in the infancy of understanding how those species interact with each other.
There are so many dynamics between predator and prey that we don’t recognize or understand.”Today, salmon runs have declined dramatically in the southern extent of their range in Washington, Oregon and California.Over that time, most adult populations have become smaller, up to 10 percent shorter in length, researchers found.