Navigation Links
New paper examines dams' effects on California salmon
Date:9/24/2007

DURHAM, N.C. -- Spring-run Chinook salmon and other fish in the rivers of Californias Central Valley could be harmed by more water-storage dams, according to researchers at Duke University and the National Oceanic and Atmospheric Administration.

The findings of a recent paper may serve as a cautionary tale to policymakers, scientists and resource managers currently embroiled in a debate about the construction of new dams in the region.

The paper, Directed Connectivity Among Fish Populations in a Riverine Network, was published in the September 3 online issue of Journal of Applied Ecology.

Robert S. Schick, of the University Program in Ecology at Duke's Nicholas School of the Environment and Earth Sciences, used analytical techniques from network science to study the relative importance of individual populations of salmon within the valley and examined how the addition of large water-storage dams blocked access to habitat and fragmented these populations over time.

"We found that fragmented populations became increasingly vulnerable to disturbance and extinction," said Schick, who co-wrote the paper with Steven T. Lindley of NOAAs Southwest Fisheries Science Center in Santa Cruz, Calif.

The paper has become topical thanks to a recent $9 billion bond proposal by California Gov. Arnold Schwarzenegger to construct two new dams and expand a third in the environmentally fragile Sacramento-San Joaquin River Delta.

Schwarzenegger says the new dams could help alleviate water-shortage problems associated with frequent droughts in the region. Some money from the bond would be used to pay for conservation improvements such as increased seasonal river flows to aid Delta Smelt, salmon and other species of fish that live in the delta area or swim upriver to spawn.

After first establishing the historical structure of the San Joaquin and Sacramento River systems, Schick and Lindley studied the progressive impact of dams on spatial connectivity among Chinook populations. In addition, they established the spatial structure of the current surviving populations in the Central Valley.

We were able to document reduced spatial and demographic connectivity between salmon populations in the rivers as a result of the dams, and we identified several populations that had become vulnerable to, and dependent upon, production in fish hatcheries, Schick said.

In addition to identifying problems linked to the dam, their network analysis identified potential solutions.

By highlighting the demographic impact of individual populations of fish, network science allowed us to propose a recovery pathway for spring-run Chinook salmon in the Central Valley, Schick noted. This pathway highlights dams whose removal would have the greatest positive impact on the species.

The methods he and Lindley employed to do their analysis can be applied broadly across taxa and systems, he added, and would be useful tools for scientists, policymakers and environmental managers in California who want a better understanding of the structure and function of impaired ecosystems.

We feel our work documents the harmful role of dams on spring-run Chinook salmon and can be used as a cautionary tale, he said.


'/>"/>

Contact: Tim Lucas
tdlucas@duke.edu
919-613-8084
Duke University
Source:Eurekalert

Related biology news :

1. Papers of DNA Pioneer and Nobel Laureate Francis Crick Added to National Library of Medicine’s Profiles in Science Web Site
2. Rewind, please: Nature paper shows that cell division is reversible
3. UCLA paper examines how one disease may prevent another
4. Recycled paper and compost could both be key tools to control plant disease
5. Developing uses for sugar-cane bagasse: Biotechnology applied to the paper industry
6. McBride shows DNA detective work with paper-eating bacteria that glide
7. Paper challenges 1491 Amazonian population theories
8. U of M researcher examines newly emerging deadly disease
9. A new study examines how shared pathogens affect host populations
10. Researcher examines polymers created with poultry feathers
11. New study examines how sense of smell affects mating and aggression in mice
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: