HOME >> BIOLOGY >> NEWS
Researchers measure effects of flow regulation and diking on salmon habitat loss

gic alteration on salmon populations in the tidal-fluvial environment (the area between the estuary and the river) Kukulka and Jay studied the estuarine shallow water habitat, which is known to play a major role in the survival of seaward-migrating juvenile salmon.

"There are few studies on the tidal-fluvial environment," said Jay. "Every river has such an area, and methods used by hydrologists for rivers and oceanographers for estuaries don't work that well. This is also a crucial area for juvenile salmon because many young salmon feed and prepare physiologically and behaviorally in the fresh, shallow waters for a rapid transition to ocean saltwater.

"The Columbia was historically the world's largest producer of Chinook salmon and of all salmon species, Chinook are especially dependent on shallow water habitat," added Jay. "The Columbia has only about 30 miles of estuary, but more than 110 miles of tidal river and none of this area has been studied much."

However, predicting tidal-fluvial water levels poses a challenge, in large part because of the unpredictability of the river flow and hydropower operations. The first part of Kukulka and Jay's study describes a new model of the tides with variable river flow. The second part of the study discusses specific changes within 40 kilometers of shallow water habitat.

The computer model that was developed for the study enabled the scientists to run a 25-year historical case in just a few minutes. "We can run a variety of scenarios with ease," Jay said. "While much more complex models could be used, the fact is that floodplain topography is poorly known and very detailed results might not be very accurate on a point-by-point basis."

The AGU-published studies also are unique from a tidal dynamic point of view, noted Jay. "We showed how tides can be predicted in an environment where there is another major factor (fluctuating river flow) in addition to astronomical factors (the
'"/>

Contact: Sydney Clevenger
clevenge@ohsu.edu
503-748-1546
Oregon Health & Science University
23-Sep-2003


Page: 1 2 3

Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Researchers identify protein promoting vascular tumor growth
4. Researchers devise potent new tools to curb ivory poaching
5. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
6. Researchers ID chlorophyll-regulating gene
7. Researchers develop fast track way to discover how cells are regulated
8. Researchers identify distinctive signature for metastatic prostate cancer
9. Researchers report new gene test for isolated cleft lip and palate
10. Researchers discover why mutant gene causes colon cancer
11. Researchers identify the genomes controlling elements

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


(Date:6/4/2019)... DIEGO (PRWEB) , ... June 04, 2019 , ... Lajollacooks4u ... of Fame recipients. The recognition, which honors hospitality excellence, is given only to businesses ... Certificate of Excellence for five consecutive years. , To qualify for the ...
(Date:5/31/2019)... ... May 30, 2019 , ... Researchers from Ambry Genetics ... significant differences in the prevalence of hereditary genetic mutations, also called germline mutations, ... women. Results will be presented at the 2019 American Society of Clinical Oncology ...
(Date:5/26/2019)... MILWAUKEE (PRWEB) , ... May 24, 2019 , ... Zolgensma ... known as AVXS-101, was approved for clinical use in the United States by the ... second virally-delivered gene therapy approved to treat inherited genetic disorders in the United States ...
Breaking Biology News(10 mins):
(Date:5/4/2019)... N.J. (PRWEB) , ... May 03, 2019 , ... ... announces the release of the Diopsys® ffERG/Photopic Negative Response vision test, ... glaucoma. , By 2050, it is estimated that 6.3 million Americans will have ...
(Date:5/2/2019)... ... May 02, 2019 , ... Stay on top of current ... and food industries. Access to all webinars is free, so be sure to register ... field! , Visit http://www.xtalks.com to see our upcoming webinars: , CLINICAL TRIALS ...
(Date:4/25/2019)... ... April 23, 2019 , ... Frank is an albino, deaf Great Dane. His owners ... him due to his health issues. Despite his hearing impairment, he was always an active ... two would play all day, every day. As the two grew, playtime became rougher and ...
(Date:4/16/2019)... ... April 16, 2019 , ... ... their project partner, the U.S. Army Center for Environmental Health Research (USACEHR), with ... Combined In-Licensing/Out-Licensing.” , Blue Sources, a veteran-owned company located at the Frederick Innovative ...
Breaking Biology Technology:
Cached News: