Navigation Links
Shifting baselines confound river restoration
Date:8/31/2009

Steep reductions in the abundance of fish, shellfish, and other aquatic fauna in recent centuries are not restricted to animals that live in the sea: historical records show that species in rivers and lakes worldwide also experienced sharp declines. Yet the significance of these declines in freshwater species is frequently overlooked by natural resource managers, according to an article in the September 2009 issue of BioScience.

Authors Paul Humphries and Kirk Winemiller argue that as a result of this neglect of historical records, watershed planning is often built on estimates of baseline abundances of fish, freshwater mussels, and beavers that are much lower than actual past abundances. Planners consequently underestimate the likely far-reaching effects such animals had on their ecosystems before European colonization.

Although precise historical numbers cannot be known, written accounts dating from the 1600s suggest that abundances were much greater than they are today. Travelers and diarists reported rivers so full of fish that a spear thrown into the water only rarely missed one, salmon runs that spanned the whole width of a river, and fish so plentiful that they were used as pig feed.

Humphries and Winemiller point out that European colonizers in North America and Australia, in particular, could easily move inland from coastal communities to supplement their seafood with food taken from freshwaters. Then, within a few decades, they started constructing weirs and mills that impeded the migration of fishes and put further pressure on stocks. Stocks of fish and shellfish declined rapidly after colonization. The effects of this early loss of wildlife on the river ecosystems, the authors contend, has not been adequately considered.

Freshwater systems that have been little exploited seem to confirm the strong effects of fishing pressure in freshwater systems. Humphries and Winemiller cite the case of rivers in the Lake E
'/>"/>

Contact: Jennifer Williams
jwilliams@aibs.org
202-628-1500 x209
American Institute of Biological Sciences
Source:Eurekalert

Page: 1 2

Related biology news :

1. Shifting Sands highlights past, present and future of Maryland coastal bays ecosystem
2. Sand dollar larvae use cloning to make change, confound predators
3. Genome of simplest animal reveals ancient lineage, confounding array of complex capabilities
4. Baiji Dolphin previously thought extinct spotted in the Yangtze River
5. UC Riverside biologist receives prestigious MacArthur Fellowship
6. International team of scientists warns of climate changes impact on global river flow
7. Stronger EPA leadership needed to improve water quality in Mississippi River
8. UC-Riverside partners with Chinese university to address Chinas environmental problems
9. X-effect: female chromosome confirmed a prime driver of speciation
10. Tiny fish can yield big clues to Delaware River health
11. Scientists from the UGR prove that rivers do not act as barriers for groundwater flow
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2015)... Washington , January 20, 2015 Investorideas.com, ... tech stocks, releases video from the CES 2015 (Consumer Electronics ... Apollo Robbins . Apollo shows how easily ... smart wallet, a product of NXT-ID, Inc. (NASDAQ: ...
(Date:1/22/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/wxdglm/global_wearable ... "Global Wearable Technologies Market and Applications, Opportunities, Industry ... Forecast 2014-2020" report to their offering. ... that can be worn on the user,s body ...
(Date:12/24/2014)... in December 2014, the 1U™ app has helped ... remember their usernames and passwords through replacing the antiquated system ... people who have struggled to remember usernames and passwords, ... on redefining identity, announced today that it is offering the ...
Breaking Biology News(10 mins):Apollo Robbins Talks about the Illusion of Personal Safety and How Easily Your Wallet is Stolen; If a Wocket Wallet is Stolen the Thief Can't do Anything With it! 2Apollo Robbins Talks about the Illusion of Personal Safety and How Easily Your Wallet is Stolen; If a Wocket Wallet is Stolen the Thief Can't do Anything With it! 3Global Wearable Technologies Market and Applications, Opportunities, Industry Analysis, Segmentation, Size, Growth, Share, Overview, Trends and Forecast 2014-2020 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 3
... Homo sapiens migrating out of Africa began ... humans hundreds of thousands of years before. Despite their ... over time, produced children with genes from both lineages. ... distinct populations remain alive in the genomes of humans ...
... Scientists have identified how a single gene in honey bees ... scientists from Michigan State University and Wayne State University unraveled ... current issue of Biology Letters . The gene, which ... role in the evolution of bees, ability to carry pollen. ...
... Elsevier, world-leading provider of scientific, technical and medical ... open access journal, Pathogenesis . ... The Royal College of Pathologists a professional membership ... and promoting excellence in the practice of Pathology. ...
Cached Biology News:When populations collide 2When populations collide 3When populations collide 4Single gene separates queen from workers 2Elsevier announces the launch of open access journal: Pathogenesis 2
(Date:2/26/2015)... FT. LAUDERDALE, Fla. , Feb. 26, 2015 /PRNewswire/ ... discussed growth priorities driven by key research advancements ... Health segments at today,s Bank of America Merrill Lynch ... worldwide met the challenge of building grain supplies the ... expected to continue at the pace of the last ...
(Date:2/26/2015)... Feb. 26, 2015  NuGene International, Inc. ("NuGene") ... for skin and hair rejuvenation, has announced that ... of record for investor relations and strategic communications. ... distribution, sales and diversification strategies – and we ... prospective shareholders," stated Ali Kharazmi CEO of NuGene ...
(Date:2/26/2015)... (PRWEB) February 26, 2015 The ... -12, at the Ernest N. Morial Convention Center ... (count as of February 19, 2015) displaying products ... industrial, academic, and government labs. The Exposition will ... but not limited to, analytical chemistry; drug discovery; ...
(Date:2/26/2015)... RURO, Inc., a leading LIMS, RFID ... – the latest update to the bestselling commercial-off-the-shelf sample ... a quick and easy method to gain better control ... RURO engineering has enhanced the system’s support for those ... of sample records. , "FreezerPro has become the ...
Breaking Biology Technology:DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 2DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 3DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 4DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 5NuGene International, Inc. Selects Capital Market Relations for Strategic Investor Relations 2NuGene International, Inc. Selects Capital Market Relations for Strategic Investor Relations 3Pittcon 2015 Announces Exposition Highlights 2RURO Releases FreezerPro® version 6.2 2
... /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE Alternext,US: SVA), a leading ... Bureau of Fengtai District in the City of Beijing suspended,the ... following a,report of the death of a minor in the ... of the vaccine two days prior. , ...
... "experimental luxuries" such as expensive spa and anti-aging treatments seek out ... else to pamper them, they pamper themselves by re-creating that same ... spa facial line, meets this growing demand for high quality treatments ... ...
... world, largely due to properties that render the materials ... of their most useful qualities, however - the ability ... - is also one of the most puzzling., This ... change shape to absorb energy rather than breaking apart, ...
Cached Biology Technology:Sinovac Releases Statement on Healive Vaccine Suspension 2ZhenSpa.com provides Spa Enthusiasts Affordable Alternatives for Expensive Spa Treatments 2ZhenSpa.com provides Spa Enthusiasts Affordable Alternatives for Expensive Spa Treatments 3ZhenSpa.com provides Spa Enthusiasts Affordable Alternatives for Expensive Spa Treatments 4Fast molecular rearrangements hold key to plastic's toughness 2Fast molecular rearrangements hold key to plastic's toughness 3
Request Info...
Goat polyclonal to Factor VIII, prediluted ( Abpromise for all tested applications). Antigen: Full length native protein (purified) (Human): Factor VIII from blood. Entrez GeneID: 2157 Sw...
Anti-Bcl-G (CT) Host: rabbit polyclonal Species Reactivity: human, mouse, rat Applications: WB, IHC Storage: 4C...
Affinity Purified Rabbit Anti-mouse sRANKL Biotinylated Polyclonal Antibody...
Biology Products: