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:7/23/2014)... Chrysomya megacephala is commonly found in dead bodies ... time of death, referred to as the post mortem ... C. megacephala from Tamil Nadu is provided for ... characterization through generation of DNA barcoding. This study, significant ... Biodiversity Data Journal . , Chrysomya megacephala ...
(Date:7/23/2014)... New Rochelle, NY -- The potential for clinical ... for transplant-based therapeutic strategies has previously been hindered ... the development of tumors. The ability to use ... for the treatment of heart disease, specifically acute ... Stem Cells and Development , a peer-reviewed ...
(Date:7/23/2014)... MINNETONKA, Minn. , July 23, 2014 /PRNewswire/ ... technology company specializing in clinical study management systems, ... West , a proven life sciences industry executive ... named Chief Operating Officer (COO).  Clareece will be ... and sales growth, operational efficiency and quality product/service ...
Breaking Biology News(10 mins):Dead body feeding larvae useful in forensic investigations 2MedNet Appoints Clareece West As Chief Operating Officer 2
(Date:7/23/2014)... July 23, 2014 ... of Trendlines Agtech , announced it has ... Israel,s leading agricultural thermoplastics applications companies. ... Valentis,s technology combines nanocrystalline cellulose (NCC), a biodegradable, ... additional nanoparticles to produce highly improved polymeric films. ...
(Date:7/23/2014)... regulated information -- UCB today announced an important advance ... topline results from the latest Phase 3 study ... evaluate the efficacy and safety of brivaracetam ... to placebo, as adjunctive treatment in adult focal ... despite treatment with one or two concomitant antiepileptic ...
(Date:7/23/2014)... 2014  Sofinnova Ventures, a Menlo Park ... of Sofinnova Venture Partners IX, L.P. at the hard ... initial fund target of $425 million. Sofinnova ... Consistent with recent funds, SVP IX will provide capital ... along with select investments in earlier stage opportunities. Investments ...
(Date:7/23/2014)... 2014 OncLive® is pleased to ... joined its Strategic Alliance Partnership program. , ... UNC Lineberger will have the opportunity to work ... its cutting-edge research initiatives, community-directed cancer prevention programs, ... work with OncLive to educate their peers by ...
Breaking Biology Technology:Valentis Nanotech Signs MOU to Integrate Technology in Thermoplastics Production 2Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 2Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 3Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 4Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 5Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 6Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 7Sofinnova Raises $500 Million Biotech Venture Fund 2OncLive Expands Its Strategic Alliance Partnership Program With the Addition of UNC Lineberger Comprehensive Cancer Center 2OncLive Expands Its Strategic Alliance Partnership Program With the Addition of UNC Lineberger Comprehensive Cancer Center 3
Cached News: