Featured Research

from universities, journals, and other organizations

West coast of North America experiencing decreasing trends in salmon spawning

Date:
July 3, 2012
Source:
Canadian Science Publishing (NRC Research Press)
Summary:
The number of adult sockeye salmon produced per spawner has been decreasing over the last decade or more along the western coast of North America, from Washington state up through British Columbia and southeast Alaska.

The number of adult sockeye salmon produced per spawner has been decreasing over the last decade or more along the western coast of North America, from Washington state up through British Columbia and southeast Alaska. A new study published in the Canadian Journal of Fisheries and Aquatic Sciences says that this widespread decrease in productivity has important implications for management of salmon stocks and requires research into its potential causes to help determine future management strategies.

"It is possible that the downward trends in productivity across the sockeye stocks south of central Alaska result from a variety of causes, such as freshwater habitat degradation or contaminants, that have each independently affected many small regions," says Randall Peterman. "However, the large spatial extent of similar time trends in productivity for over 25 stocks has occurred in both relatively pristine and heavily disturbed habitats. This suggests that shared mechanisms are a more likely explanation -- for example, high mortality owing to predators, pathogens, or poor food supply that occurs across Washington, B.C., southeast Alaska, and the Yakutat region of Alaska."

The authors analyzed productivity of 64 sockeye salmon populations and found that the decline in productivity of Fraser River, British Columbia sockeye salmon was not unique to that river system, and that productivity has also declined rapidly in many other populations since the 1990s. The authors also found that the region with downward trends in productivity has spread further north over the past two decades, an observation that is consistent with large-scale changes in climate-driven oceanographic patterns that were previously implicated as drivers of sockeye productivity.


Story Source:

The above story is based on materials provided by Canadian Science Publishing (NRC Research Press). Note: Materials may be edited for content and length.


Journal Reference:

  1. Randall M. Peterman,a Brigitte Dornerb. A widespread decrease in productivity of sockeye salmon (Oncorhynchus nerka) populations in western North America. Canadian Journal of Fisheries and Aquatic Sciences, 2012 DOI: 10.1139/F2012-063

Cite This Page:

Canadian Science Publishing (NRC Research Press). "West coast of North America experiencing decreasing trends in salmon spawning." ScienceDaily. ScienceDaily, 3 July 2012. <www.sciencedaily.com/releases/2012/07/120703142907.htm>.
Canadian Science Publishing (NRC Research Press). (2012, July 3). West coast of North America experiencing decreasing trends in salmon spawning. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2012/07/120703142907.htm
Canadian Science Publishing (NRC Research Press). "West coast of North America experiencing decreasing trends in salmon spawning." ScienceDaily. www.sciencedaily.com/releases/2012/07/120703142907.htm (accessed September 2, 2014).

Share This




More Plants & Animals News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Washington Wildlife Center Goes Nuts Over Baby Squirrels

Washington Wildlife Center Goes Nuts Over Baby Squirrels

Reuters - US Online Video (Aug. 30, 2014) An animal rescue in Washington state receives an influx of orphaned squirrels, keeping workers busy as they nurse them back to health. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Newsy (Aug. 29, 2014) In a new study, a promising experimental treatment for Ebola managed to cure a group of infected macaque monkeys. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins