HOME >> BIOLOGY >> NEWS
Bottom-up Ecological Processes Better For Clear Waters, Study Finds

om-up processes had a greater impact on algae growth than the top-down processes.

"Both played a role, but nutrients had a bigger impact on algal biomass," Brett said.

The science meta-analysis paper by Brett and Goldman also casts doubt upon the universal nature of a popular model developed by Lauri Oksanen, a theoretical ecologist at the University of Umeå in northern Sweden. The model predicts that food webs will respond to increased growth at the plant level, such as algae, in different ways depending upon the number of levels in the food web.

In the experiments summarized in the UC Davis analysis in Science, the response of phytoplankton and zooplankton to adding nutrients was not related to the number of trophic levels in the system, Brett said. In food webs with two levels (plants and herbivores), Oksanen's model predicts that increased plant production will fuel growth of herbivores to the extent that the plant eaters munch all the extra food, resulting in no net gain at the plant level.

In food webs with three levels (plants, herbivores and predators), Oksanen's model predicts that increased plant production will result in more predators and plants, but fewer herbivores, because the predators will eat all the extra herbivores, allowing the plants to grow and thrive.

The UC Davis researchers found opposite results from the model predictions for the two-level food webs. "The crux of the model is that the number of levels determines how energy moves through the food web, and we found the response was not related to the number of trophic levels," Brett said.

Some of the most important unanswered questions in food web ecology still remain, according to Brett and Goldman. What determines how fast and how much energy moves through food webs? How can lakes or oceans with similar algae production vary so dramatically in fisheries production?


'"/>

Contact: Carol Morton
ccmorton@ucdavis.edu
916-752-7704
University of California - Davis
17-Jan-1997


Page: 1 2 3 4

Related biology news :

1. Ecological science for a crowded planet
2. Ecological success?
3. Ecological Society of America 88th annual meeting
4. Ecological effects of climate change include human epidemics
5. Ecological significance of tool-use in the woodpecker finch Cactospiza pallida
6. Ecological risks of GMOs come in unexpected ways, model shows
7. Energy departments Idaho lab teams with Russia to establish Ecological Biotrade facility
8. Ecological trends of food availability yield clues to Americans weight problem
9. The Geometry of Ecological Interactions: Simplifying Spatial Complexity
10. Ecological Society of America and the British Ecological Society to meet
11. Colorado State scientist is Ecological Society of America president

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Bottom Ecological Processes Better For Clear Waters Study Finds

(Date:4/27/2015)... OXFORD, Conn. , Apr. 27, 2015 ... "Company"), a biometric authentication company focused on the growing ... will commence shipping to pre-order customers the first week ... pre-orders through the month of May. ... is a significant milestone for the company as Wocket® ...
(Date:4/21/2015)... Canada , April 21, 2015 ... and evolving government policies are boosting access control systems ... According to a recently published report by ... Opportunities, 2020 ", the access control systems market in ... nearly USD1.2 billion by 2020.The access control systems market ...
(Date:4/20/2015)... The announcement comes as demand for fire ... Ireland,s foremost records management company, has ... an impressive track record of clients within the first 12 ... management sector in Dubai . As a ... employ a further eight staff members at its Irish headquarters. ...
Breaking Biology News(10 mins):Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 2Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 3Saudi Arabia Access Control Systems Market to Touch USD1.2 Billion by 2020 Says TechSci Research 2Saudi Arabia Access Control Systems Market to Touch USD1.2 Billion by 2020 Says TechSci Research 3Glenbeigh Records Management Wins Contract With Dubai Islamic Bank 2Glenbeigh Records Management Wins Contract With Dubai Islamic Bank 3
(Date:5/21/2015)... May 20, 2015 Research and Markets ... of the "2015 Global Survey on Flow ... The primary goal of this research ... instruments and reagents. Key information the survey seeks ... of flow cytometers, predominantly used applications for flow ...
(Date:5/20/2015)... SAN FRANCISCO, Calif. , May 20, 2015 ... VCYT ) today presented preliminary data demonstrating the ... distinguish idiopathic pulmonary fibrosis (IPF) from other interstitial ... The findings suggest the classifier,s potential to help ... surgery to resolve ambiguity in IPF diagnosis – ...
(Date:5/20/2015)... , May 20, 2015  Select Medical ... the Federal Trade Commission granted early termination of ... Improvements Act of 1976, as amended, applicable to ... Acquisition Corporation, a joint venture that Select has ... As previously announced, MJ Acquisition Corporation ...
(Date:5/20/2015)... NEW YORK , May 20, 2015 /PRNewswire-USNewswire/ ... announced a leadership gift of $100 million from ... help create a new laboratory building that will ... campus extension. The Marie-Josée and Henry R. Kravis ... over the FDR Drive, spanning approximately three city ...
Breaking Biology Technology:Global Survey on Flow Cytometry Adoption Trends 2015 2Veracyte Presents Preliminary Data Demonstrating Ability of Molecular Classifier to Improve Non-Surgical IPF Diagnosis Using Bronchoscopy Samples 2Veracyte Presents Preliminary Data Demonstrating Ability of Molecular Classifier to Improve Non-Surgical IPF Diagnosis Using Bronchoscopy Samples 3Veracyte Presents Preliminary Data Demonstrating Ability of Molecular Classifier to Improve Non-Surgical IPF Diagnosis Using Bronchoscopy Samples 4Veracyte Presents Preliminary Data Demonstrating Ability of Molecular Classifier to Improve Non-Surgical IPF Diagnosis Using Bronchoscopy Samples 5Select Medical Corporation's Proposed Acquisition of Concentra Inc. through Joint Venture with Welsh Carson Receives Antitrust Clearance 2The Marie-Josee and Henry R. Kravis Foundation Provides Landmark Gift of $100 Million to The Rockefeller University 2The Marie-Josee and Henry R. Kravis Foundation Provides Landmark Gift of $100 Million to The Rockefeller University 3The Marie-Josee and Henry R. Kravis Foundation Provides Landmark Gift of $100 Million to The Rockefeller University 4
Cached News: