Navigation Links
Too much of a good thing? Excess nutrients or water limit biodiversity

Too much of a good thing (nutrients or water) actually decreases the diversity of species in an ecosystem while it increases the productivity of a few species, according to a grassland experiment conducted by University of Minnesota researchers.

The reduction in species diversity occurs because increasing the amounts of limiting resources, such as nitrogen and water, makes an ecosystem more homogeneous and consequently reduces the number of opportunities for competing species to coexist. Put another way, it reduces the number of niches, allowing a few species to dominate.

The study, conducted by David Tilman, Regents Professor of Ecology, and Stanley Harpole will be published March 25 in the online version of the journal Nature. Harpole, who is now a postdoctoral associate at the University of California, Irvine, was a graduate student at the University of Minnesota when the research was carried out.

"In essence, the data in the article strongly supports a new explanation for why the world contains so many species," said Tilman. "It shows that plant diversity is directly related to the number of limiting factors (such as soil moisture, nitrogen, phosphorous, potassium and water)."

It also helps explain why grasslands, lakes and rivers that are polluted with nitrogen and phosphorous (usually from agriculture) have fewer species. The reduction of species where the Mississippi River empties into the Gulf of Mexico is one of the best known examples of this phenomenon.

The findings are based on experiments carried out at the University of California’s Sedgwick Reserve in the Santa Ynez Valley, where the researchers applied combinations of nutrients and water to plots of grassland. Plots that received all of the resources had the fewest species and highest productivity. They combined this with analysis of the 150 year old Rothamsted Park Grass Experiment. Both supported their hypothesis.

"Our results show that
'"/>

Source:University of Minnesota


Page: 1 2

Related biology news :

1. How exactly does the brain control breathing?
2. Excess liver gene protects against high-fat diet
3. Mechanism for the captation of nutrients in plants- unknown to date
4. Fish extinctions alter critical nutrients in water, study shows
5. Anti-bacterial additive widespread in U.S. waterways
6. Unprecedented water level rise in Somalia
7. Microbial fuel cell: High yield hydrogen source and wastewater cleaner
8. Survey finds silver contamination in North Pacific waters
9. Researchers discover underwater volcano
10. Too much water may be as dangerous as too little during long-distance athletic events
11. Radio-tracking associated with dramatic shift in water vole sex ratio
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Too much good thing Excess nutrients water limit biodiversity

(Date:9/22/2014)... Antarctic fishes that manufacture their own "antifreeze" proteins ... suffer an unfortunate side effect, researchers report: The ... resist melting even when temperatures warm. , ... of the National Academy of Sciences . , ... consequence of the evolution of antifreeze proteins in ...
(Date:9/22/2014)... (September 22, 2014)The Brain & Behavior Research ... of NARSAD Young Investigator Grants valued at ... the world,s most promising young scientists. Recipients ... neurobiological research will seek to identify causes, ... psychiatric disorders that affect one in four ...
(Date:9/22/2014)... Mobile robots could be much more useful in homes, ... robots usually see the world with cameras and lasers, ... objects that are hidden in clutter. A complementary way ... the use of small ultra-high frequency radio-frequency identification (UHF ... objects, allowing an RFID-equipped robot to search a room ...
Breaking Biology News(10 mins):Study: Antifreeze proteins in Antarctic fishes prevent freezingand melting 2Study: Antifreeze proteins in Antarctic fishes prevent freezingand melting 3Brain & Behavior Research Foundation awards 200 NARSAD Young Investigator grants 2New RFID technology helps robots find household objects 2New RFID technology helps robots find household objects 3
... of researchers from The University of Texas at Dallas have ... the technologies of the next generation. One UT Dallas ... with the goal of creating faster electronics that use dramatically ... computer architecture that allows the many types of computers used ...
... on January 22, 2013, a team of paleontologists including Dr. ... Angeles County,s (NHM) Dinosaur Institute, has discovered a way to ... Confuciusornis sanctus , a 125-million-year-old Mesozoic bird, had remarkable ... ornamental tail feathers, others had none features that have ...
... Biologist Erica Larschan, Ph.D., was named by The ... innovative findings on chromosomal activity in fruit flies. 2011 Pew Biomedical ... in identifying a protein that allows a male fruit fly to ... proven similar in human males, could point the way to treatments ...
Cached Biology News:UT Dallas researchers awarded $4.3 million to create next-generation technologies 2UT Dallas researchers awarded $4.3 million to create next-generation technologies 3UT Dallas researchers awarded $4.3 million to create next-generation technologies 4Sex of early birds suggests dinosaur reproductive style 2
(Date:9/23/2014)... WASHINGTON, New York , September 23, 2014 ... ), a leading provider of  Closed System Transfer   ... a new exclusive partnership with Taiwanese distributor MedFront Medical Technology ... regulatory bodies in Taiwan , ... for approval as the company continues to expand ...
(Date:9/23/2014)... NY (PRWEB) September 23, 2014 Marktech ... of deep ultra violet emitters in the 280 nm ... standard UV emitters which range from 280nm to 405nm. ... and water sanitation as well as curing. Mark Campito, ... line of special interest to manufacturers is that we ...
(Date:9/23/2014)... 2014 Healthcare professionals, patients ... convene at the Society for Integrative Oncology ... October 26-28 in Houston, Texas to discuss ... in individualized integrative cancer care. This multi-disciplinary ... nutritionists, naturopaths, acupuncturists, and other complementary care ...
(Date:9/23/2014)... September 23, 2014 New ... Imperial Innovations, Cambridge Innovation Capital and Johnson & ... cancer genomics company focused on harnessing the potential ... cancer testing and treatment, today announced it has ... Imperial Innovations and including Cambridge Innovation Capital and ...
Breaking Biology Technology:Equashield Enters Taiwan Following Expansion to Australia, Japan, China 2Marktech Introduces its New Line of Deep UV Emitters 2International Medical Experts to Discuss Latest Integrative Oncology Research and Its Translation to Personalized Clinical Care at 11th International Conference of SIO 2International Medical Experts to Discuss Latest Integrative Oncology Research and Its Translation to Personalized Clinical Care at 11th International Conference of SIO 3Inivata Raises £4m to Realise the Potential of ctDNA Analysis to Improve Cancer Treatment Through Simple Blood Tests 2Inivata Raises £4m to Realise the Potential of ctDNA Analysis to Improve Cancer Treatment Through Simple Blood Tests 3Inivata Raises £4m to Realise the Potential of ctDNA Analysis to Improve Cancer Treatment Through Simple Blood Tests 4
... definition has potential to revolutionize,endoscopic surgery, LAS ... glimpse into the,future of women,s healthcare with the ... first time using "4K" technology, at the 37th,Global ... AAGL. AAGL,is the international professional society for specialists ...
... Nutrition 21, Inc.,(Nasdaq: NXXI ) today ... and general manager of the Company,s Direct Response ... than 22 years of,experience in sales, marketing, management ... McWilliams, responsibilities include new,business development, sales strategy, vendor ...
... Va., Oct. 30 Insmed Inc. (Nasdaq:,INSM), a developer of follow-on biologics ... 30,2008., Recent Company Highlights, -- Follow-on Biologics Program ... Kingdom,s Medicines and ... study for the Company,s second ...
Cached Biology Technology:Women's Surgery Recorded for the First Time on '4K' Digital Cinema is Presented at the AAGL Congress 2Nutrition 21 Appoints Pam McWilliams, Vice President - General Manager of Direct Response 2Nutrition 21 Appoints Pam McWilliams, Vice President - General Manager of Direct Response 3Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 2Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 3Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 4Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 5Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 6Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 7Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 8Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 9Insmed Announces Financial Results for Third Quarter and Nine-Months Ended September 30, 2008 10