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:9/29/2014)... annual Advocacy Awards will ... advancing medical progress to improve the health and ... take place on Wednesday, March 11, 2015, at ... , The 2015 Advocacy Award winners are ABC,s ... founder of the Milken Institute and FasterCures; Dr. ...
(Date:9/29/2014)... beginning of the age of dinosaurs, gigantic reptilesdistant relatives ... and others in water and it was thought they ... University of Tennessee, Knoxville, researcher in the thigh of ... , Stephanie Drumheller, an earth and planetary sciences ... Sterling Nesbitt examined 220-million-year-old bite marks in the thigh ...
(Date:9/29/2014)... Institute (DOE JGI), a DOE Office of Science ... have been selected for the 2015 Community Science ... waters, and from plant root micro-ecosystems, to the ... the CSP 2015 projects portfolio highlights diverse environments ... , "These projects catalyze JGI,s strategic shift in ...
Breaking Biology News(10 mins):Research!America to honor leaders in medical and health research advocacy 2Research!America to honor leaders in medical and health research advocacy 3Research!America to honor leaders in medical and health research advocacy 4Tooth serves as evidence of 220 million-year-old attack 22015 DOE JGI's science portfolio delves deeper into the Earth's data mine 22015 DOE JGI's science portfolio delves deeper into the Earth's data mine 32015 DOE JGI's science portfolio delves deeper into the Earth's data mine 42015 DOE JGI's science portfolio delves deeper into the Earth's data mine 52015 DOE JGI's science portfolio delves deeper into the Earth's data mine 62015 DOE JGI's science portfolio delves deeper into the Earth's data mine 72015 DOE JGI's science portfolio delves deeper into the Earth's data mine 82015 DOE JGI's science portfolio delves deeper into the Earth's data mine 9
... neighbors, and now researchers reporting in the June 22 issue ... they have a motive. It appears that chimps, and especially ... gain territory. "The take-home is clear and simple," ... each other. They kill their neighbors. Up until now, we ...
... which aims to develop a new, higher-yielding rice plant which could ... by an academic at the University of Sheffield. Currently, more ... a day and nearly one billion live in hunger. Over the ... about 50 per cent and water scarcity will grow. About half ...
... international public-private consortium to build the most detailed map ... of three pilot projects and the deposition of the ... use by the research community. In addition, work has ... database containing information from the genomes of 2,500 people ...
Cached Biology News:Why chimpanzees attack and kill each other 2Rice yields researched to tackle food security issues 2Rice yields researched to tackle food security issues 3Freely available data supporting next generation of human genetic research 2Freely available data supporting next generation of human genetic research 3Freely available data supporting next generation of human genetic research 4Freely available data supporting next generation of human genetic research 5Freely available data supporting next generation of human genetic research 6
(Date:9/27/2014)... University of Pennsylvania researchers has now applied a ... other nanoscopic structures. By passing nanoscale spheres and ... the team was able to measure the electrical ... suggest new ways of using this technique, known ... smallest scale. , The research was led ...
(Date:9/26/2014)... Research and Markets  has announced the ... Markets: Market Developments, Growth Areas and Opportunities" report ... comprehensive global end-user study and market analysis relating to ... in the laboratory. Market findings from this ... by research scientists and clinicians who routinely use nucleic ...
(Date:9/26/2014)... Molecular Biology deals with the ... regulation of cellular activity and its behaviour. It emphasise ... with its environment within the genome. Knowledge on molecular ... therapeutic methodologies for the diagnosis, prognosis and the treatment ... Dr. Srinubabu Gedela, MD of OMICS Publishing Group ...
(Date:9/26/2014)... (PRWEB) September 26, 2014 Talon ... and Assemblies for the Semiconductor, Medical Device, ... it has won the Minnesota Business magazine’s Employee ... companies for excellence in helping Minnesota-based employees improve ... in our people, our processes and our capabilities ...
Breaking Biology Technology:Penn team studies nanocrystals by passing them through tiny pores 2Penn team studies nanocrystals by passing them through tiny pores 3Penn team studies nanocrystals by passing them through tiny pores 4DNA and RNA Sample Preparation Markets: Market Developments, Growth Areas and Opportunities 2DNA and RNA Sample Preparation Markets: Market Developments, Growth Areas and Opportunities 3Understanding Genetics and Molecular Biology to Avert Dreadful Medical Challenges during Open Access Week 2Understanding Genetics and Molecular Biology to Avert Dreadful Medical Challenges during Open Access Week 3Talon Innovations Wins Minnesota Business Magazine Award 2Talon Innovations Wins Minnesota Business Magazine Award 3
... Educational program offers unique resources to empower transplant patients ... ... Oct. 17 Astellas Pharma US,Inc. (Pink Sheets: ALPMF), a ... Society (ITNS), a leading transplant,professional organization, announced a collaborative partnership ...
... to Dominate the Type 2 Diabetes Market, According to a ... New Report from Decision Resources, ... have released a new report finding that Merck,will obtain blockbuster antidiabetic ... uptake of their DPP-IV inhibitor, Januvia.,Januvia will see rapid uptake as ...
... 24, at 1:30 p.m. EDT, ALAMEDA, Calif., ... a biopharmaceutical company developing innovative therapies,for the treatment ... to discuss third quarter results on Wednesday, October ... Kenneth Chahine, Chief Executive,Officer, and Michael Coffee, Chief ...
Cached Biology Technology:Astellas Pharma US, Inc. and The International Transplant Nurses Society (ITNS) Collaborate on Content for Transplant Experience Program 2Astellas Pharma US, Inc. and The International Transplant Nurses Society (ITNS) Collaborate on Content for Transplant Experience Program 3Merck Will Obtain Blockbuster Antidiabetic Drug Sales in Type 2 Diabetes Market by 2011 2Merck Will Obtain Blockbuster Antidiabetic Drug Sales in Type 2 Diabetes Market by 2011 3Avigen, Inc. Announces Third Quarter 2007 Earnings Conference Call 2