Using stable isotope analyses of N and C we present preliminary evidence of marine-derived nutrients from introduced Chinook salmon (Oncorhynchus tshawytscha Walbaum) in stream food webs of Laguna Los Patos, NW Patagonia. Similar to values reported within Chinook salmon's native distributional range periphyton and aquatic insects are the trophic levels that show the greatest enrichment of δ15N ...

In 1992, the seemingly unbeatable World Checker Champion, Dr. Marion Tinsley, defended his title against the computer program Chinook. After an intense, tightly-contested match, Tinsley fought back from behind to win the match by scoring four wins to Chinook’s two, with 33 draws. This was the first time in history that a human World Champion defended his title against a computer. This article r...

‘Hop’ ( Humulus lupulus ) cultivar trials were conducted at sites in three Virginia counties (Northampton, Chesterfield, and Madison) response to demand by the craft beer industry for local ingredients. In 2016, a replicated study involving five cultivars (Cascade, Chinook, Newport, Nugget, Zeus) was established on an 18-ft-tall trellis system each site. Weather data influencing infectivity of ...

The Columbia River and its tributaries provide essential spawning and rearing habitat for many salmonid species, including Chinook salmon (Oncorhynchus tshawytscha). Chinook salmon were historically abundant throughout the basin and Native Americans in the region relied heavily on these fish for thousands of years. Following the arrival of Europeans in the 1800s, salmon in the basin experienced...

Harvests of Yukon Chinook salmon increased in the mid-1970s, then declined during 1998 to 2007 in response to fewer returning salmon. We examined annual growth of age-1.3 and age-1.4 Yukon Chinook salmon scales, 1965–2004, and tested the hypothesis that shifts in Chinook salmon abundance were related to annual growth at sea. Annual scale growth trends were not significantly correlated with salm...

Wallace's riverine barrier hypothesis postulates that large rivers, such as the Amazon and its tributaries, reduce or prevent gene flow between populations on opposite banks, leading to allopatry and areas of species endemism occupying interfluvial regions. Several studies have shown that two major tributaries, Rio Branco and Rio Negro, are important barriers to gene flow for birds, amphibians ...

Seven of 118 wild-caught chinook salmon Oncorhynchus tshawytscha had histologic signs of plasmacytoid leukemia (PL). A pooled tissue sample from 2 of these PLpositive f ~ s h was examined and found to be Infected with a retrovirus as ~ndicated by the elevated reverse transcnptase activity associated with a density of 1.17 g cm-3 in sucrose and polypeptides with identical electrophoretic mobilit...

A plasmacytoid leukemia of chinook salmon, Oncorhynchus tshawytscha, has recently been recognized in seawater netpens in British Columbia, Canada. The disease has occurred at several sites and has caused high mortality. Plasmacytoid leukemia is characterized by a generalized invasion of visceral tissues and the orbit of the eye by plasmacytoid cells. The disease was experimentally transmitted t...

We studied salmon feeding selectivity and diel feeding chronology in the Columbia River plume. Juvenile chinook and coho salmon were caught by trawling at 2–3 h intervals throughout a diel period on three consecutive days (21–23 June 2000) at stations located 14.8 and 37 km offshore from the mouth of the Columbia River. A total of 170 chinook salmon were caught at the inshore and 79 chinook and...