HOME >> BIOLOGY >> NEWS
Wild salmon vulnerable to climate change, Science study reports

As if overfishing and habitat loss weren't threats enough for wild salmon, the imperiled fish are also vulnerable to climate change, suggests a new study in the 27 October issue of the international journal, Science.

Decomposing salmon carcasses have left behind a 300-year record of oceanic nitrogen in Alaskan lake bottoms, revealing population swings that seem to be related to known climate changes from this period.

Climate's impact on wild salmon has been uncertain, because existing population records were relatively short and complicated by the effects of fishing, dam-building, and other human activities.

"Traditionally, fisheries managers assumed the environment was constant when they calculated the maximum number of salmon that fishermen could harvest. But our study suggests a need for new, flexible management policies that take climate and lake nutrient levels into account," said lead Science author Bruce Finney of the University of Alaska-Fairbanks.

Finney and his colleagues delved beyond recent human influences by studying historical levels of the isotope nitrogen-15 in sediment core from lakes on Alaska's Kodiak island and near Bristol Bay.

In the ocean, salmon incorporate high levels of nitrogen-15 into their tissues. The isotope is only abundant in Alaska's coastal lakes if it's released from dead salmon that returned to the lake at the end of their lives to spawn. Lakes blocked off by waterfalls, for example, have lower levels of nitrogen-15.

Finney's team found several major fluctuations in nitrogen-15 levels over the last 300 years. These swings implied drops in the salmon population during the early 18th and 19th centuries, periods that were cooler than average, according to other studies cited in the Science paper.

The biggest salmon decline occurred in the 20th century, as human activities started to take effect.

The researchers also discovered a positive feedback effect that may be further
'"/>

Contact: Ginger Pinholster
gpinhols@aaas.org
202-326-6421
American Association for the Advancement of Science
26-Oct-2000


Page: 1 2 3

Related biology news :

1. PNNL lands $10.3 million NIH biodefense contract to unlock proteomes of salmonella and pox
2. Flame retardant levels much higher in farmed salmon
3. Common worm provides insights into salmonella virulence
4. Policy review in Science calls for Bush Administration to protect wild salmon
5. Aquatic scientists divided on role of sea lice from salmon farms in decline of native salmon in B.C.
6. Farmed salmon more toxic than wild salmon, study finds
7. New book says Northwest salmon could face same fate as those in Northeast, England
8. UVa scientists detail salmonella protein
9. Researchers measure effects of flow regulation and diking on salmon habitat loss
10. Salmon farms pose significant threat to salmon fisheries in the Pacific Northwest, researchers find
11. Threatened juvenile salmon get scientific assistance

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... 24, 2017 The Controller General of Immigration from ... Abdulla Algeen have received the prestigious international IAIR Award for the ... Continue Reading ... ... Controller Abdulla Algeen (small picture on the right) have received the IAIR ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... and LAGUNA HILLS, Calif. , Oct. ... Cancer Research, London (ICR) and University ... SKY92, SkylineDx,s prognostic tool to risk-stratify patients with multiple myeloma ... MUK nine . The University of Leeds ... partly funded by Myeloma UK, and ICR will perform the ...
(Date:10/10/2017)... ... 2017 , ... San Diego-based team building and cooking events company, Lajollacooks4u, has ... The bold new look is part of a transformation to increase awareness, appeal to ... period. , It will also expand its service offering from its signature gourmet cooking ...
(Date:10/10/2017)... 10, 2017 International research firm Parks Associates announced ... at the TMA 2017 Annual Meeting , October 11 in ... residential home security market and how smart safety and security products impact ... Parks Associates: Smart Home ... "The residential security market has ...
(Date:10/9/2017)... DIEGO , Oct. 9, 2017  BioTech ... biological mechanism by which its ProCell stem cell ... critical limb ischemia.  The Company, demonstrated that treatment ... amount of limbs saved as compared to standard ... the molecule HGF resulted in reduction of therapeutic ...
Breaking Biology Technology:
Cached News: