Navigation Links
Tahoe native fish population declines sharply, invasives on the rise
Date:3/22/2011

uegill were common in the Tahoe Keys, while native Lahontan redside shiner and speckled dace populations declined or were virtually eliminated from the Tahoe Keys, at the south end of the lake, an important rearing ground for native fish.

"Our knowledge of Lake Tahoe's nearshore fishery is very limited. There have only been a few sporadic assessments and documentaries of the nearshore fishery in the past 60 years, and no studies were conducted in the last 20 years after the establishment of invasive, warmwater fishes," Ka Lai Ngai, a researcher in the University's Department of Natural Resources and Environment said.

This knowledge gap stimulated the process of conducting a contemporary assessment and developing ecologically relevant metrics to assess the nearshore fishery. Chandra proposes one of those metrics be ultraviolet radiation exposure, and a new TRPA threshold be developed for it, the Ultraviolet Attainment Threshold. The UVAT is a target value for water clarity based on surface UV exposure during peak spawning season, and experimentally derived UV exposure levels lethal to larval warmwater fish.

"We've found that decreased ultraviolet radiation is one of the major factors in the changes that make it easier for invasive species to proliferate, including fish, plants and mollusks," Chandra said.

Tahoe watchers are accustomed to hearing about clarity of the water, and it's decline, and UV radiation penetration is affected by clarity. In Lake Tahoe the average annual Secchi transparency dropped from 102 feet in 1968 to 69 feet by 1998. The summer 2010 Secchi reading was 68 feet. During this same time a number of nonnative warmwater fish species became established in portions of the lake suggesting that decrease in water transparency may create a refuge for nonnative species that are less sensitive to the optical properties of water such as ultraviolet radiation.

To get a more objective, quantifiable measure, and ra
'/>"/>

Contact: Mike Wolterbeek
mwolterbeek@unr.edu
University of Nevada, Reno
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Results of ecosystem restoration research at Tahoe to be unveiled
2. Scripps studies offer new picture of Lake Tahoes earthquake potential
3. Ecologists use 70-year-old pressed plants to chart citys vanishing native flora
4. UCLA researchers engineer E. coli to produce record-setting amounts of alternative fuel
5. Alternatives eyed for methyl bromide
6. Chicken litter provides organic alternative to synthetic fertilizers
7. Research proves new soybean meal sources are good fish meal alternatives
8. Native American ancestry linked to greater risk of relapse in young leukemia patients
9. Neiker-Tecnalia creates air-conditioned greenhouse with alternative energies
10. Home and away: How do invasive plant species dominate native species?
11. ONR, Marine Corps show alternative energy use at forward operating bases can save dollars, lives
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Tahoe native fish population declines sharply, invasives on the rise
(Date:9/11/2014)... professor of mechanical engineering at Worcester Polytechnic ... university,s Integrative Materials Design Center (iMdc), has ... National Science Foundation (NSF) to support the ... metal-ceramic composites, which can be used to ... while significantly increasing their performance. , The ...
(Date:9/11/2014)... 11, 2014 UT Southwestern Medical Center, 2M Companies, ... research and drug development for neurodegenerative disorders caused by ... week, UT Southwestern researchers published a new paper about ... has been shown to help in various animal models ... to Dallas-based 2M Companies. 2M and Calico have now ...
(Date:9/11/2014)... In a study that sheds light on the ... of South America, LSU Museum of Natural Science Director ... Biological Sciences, Robb Brumfield, and an international team of ... published a paper this week challenging the view that ... formed is directly linked to geological and climatic ...
Breaking Biology News(10 mins):NSF funds new method for making materials that can make lighter, more efficient vehicles 2NSF funds new method for making materials that can make lighter, more efficient vehicles 3Calico enters into exclusive collaboration with 2M to develop UTSW technology 2Calico enters into exclusive collaboration with 2M to develop UTSW technology 3LSU scientists lead research on speciation in the tropics 2
... Ivaska (University of Turku and VTT Technical Research Centre of ... National Institute for Health and Welfare) have discovered that the ... a leading journal, the study concludes that SHARPIN regulates the ... prostate cancer cells. It is likely that the discovery will ...
... risk of extinction is a complicated task, especially for species ... University of Georgia and Tulane University have developed a mathematical ... appears in the early online edition of the Royal Society ... for a lot of species, we don,t know very much ...
... might lead to the development of better intervention methods, according ... published in the journal Substance Use & Misuse ... prompted college students to recall their smoking experience, and that ... and on weekends. "Students are using social events ...
Cached Biology News:New model more accurately describes migratory animals' extinction risk 2Research reveals when and why students smoke in effort to help them quit 2
(Date:9/11/2014)... Frederick, MD (PRWEB) September 12, 2014 ... systems (LIMS), radio-frequency identification (RFID) solutions and sample ... version 5.1. , RURO completed work on the ... late August and it has already seen mass ... recent major release of version 5.0 brought an ...
(Date:9/11/2014)... team of Berkeley Lab researchers believes it has ... of single atomic layers of transition metal dichalcogenide ... promise for nanoelectronic and photonic applications. , ... of tungsten disulfide, one of the most promising ... existence of excitonic dark states energy states ...
(Date:9/11/2014)... surface of graphene, a one atom thick sheet of ... graphene oxide; a form of graphene that could have ... industries. Applied as paint, it could provide an ultra-strong, ... , Graphene oxide solutions can be used to ... even conventional bricks. After a simple chemical treatment, the ...
(Date:9/11/2014)... Sept. 11, 2014 XBiotech announced today it ... machine that the Company says will be used to ... system is designed to fill, stopper and crimp vials, ... Additionally, the unit is said to contain an in-line ... provide a high level of quality compared to less ...
Breaking Biology Technology:Limfinity® Version 5.1 Available 2Excitonic dark states shed light on TMDC atomic layers 2Excitonic dark states shed light on TMDC atomic layers 3Graphene paints a corrosion-free future 2
... Press Ganey Associates, Inc. has announced its elite class ... the first-ever Summit and Top Improver awards for clinical ... Medical Centers. Press Ganey, the health ... more than 10,000 health care organizations worldwide to create ...
... Calif., Nov. 15, 2011 Quest Diagnostics Incorporated (NYSE: ... diagnostic testing, information and services, today announced that its ... Cytomegalovirus (CMV) molecular test kit on the 3M™ Integrated ... The test is designed to enable hospital labs to ...
... AURORA, Colo., Nov. 15, 2011 In a strategic ... Redevelopment Authority (FRA) has completed a regimen of planning ... allocation of resources going forward. The announcement is made ... "Our first tactic in refocus involves augmenting our board ...
Cached Biology Technology:Nation's Best Health Care Organizations for Patient Satisfaction, Core Measures Honored by Press Ganey 2Nation's Best Health Care Organizations for Patient Satisfaction, Core Measures Honored by Press Ganey 3Quest Diagnostics CE Marks Simplexa™ Test for Cytomegalovirus for Sale in Europe 2Quest Diagnostics CE Marks Simplexa™ Test for Cytomegalovirus for Sale in Europe 3Fitzsimons Redevelopment Authority Rolls Out First Phase of Strategic Refocus With Appointment of Four Key Leaders in The Bioscience Industry to Its Board of Directors 2
... Zyagen tissue microarrays are derived from ... to rigorous quality control procedures to ensure ... are manually assembled in one block, sectioned ... mounted on coated slides. Sections are large ...
... Zyagen tissue microarrays are derived from frozen ... rigorous quality control procedures to ensure the ... manually assembled in one block, sectioned at ... coated slides. Sections are large (3-5mm in ...
... The DNA Engine Opticon real-time PCR detection ... for fluorescence excitation (450-495 nm) and a ... The Opticon system is built on an ... a thermal gradient feature. This item includes ...
... for Optimal Microdissection , CapSure HS and ... and rapid extraction of populations of pure ... with Laser Capture Microdissection., Ensure the ... Analysis , All CapSure LCM Caps have ...
Biology Products: