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:


(Date:7/4/2020)... ... July 03, 2020 , ... Aesthetics ... recognition and multiple awards for not only the products and treatments developed, but ... and Vivace® Microneedle RF. All the brands built by ABM have received several ...
(Date:7/1/2020)... ... July 01, 2020 , ... Catalent, a ... purchase of Teva-Takeda Pharmaceuticals’ packaging facility in Minakuchi, located in the Shiga prefecture ... facility located in Kakegawa, the new 60,000-square-foot facility will provide customers with flexible ...
(Date:6/28/2020)... ... ... In an upcoming episode scheduled for the fall of 2020, Advancements with Ted ... local listings for more info. , Today, the majority of testing is performed at ... the country. Results are then available several days later. Now, in an effort to ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... July 16, 2020 , ... “We are thrilled to deliver this new technology ... technology of its kind on the market and we were pleased that the IFT ... of traditional cultured ingredients, creating a natural way to extend the shelf life and ...
(Date:7/10/2020)... ... July 09, 2020 , ... ... that Massachusetts Institute of Technology (MIT) has expanded the company’s exclusive license ... to move into the point-of-care diagnostic market, focusing initially on the SARS-CoV-2 ...
(Date:7/7/2020)... ... July 06, 2020 , ... ... Entries from Roche, Eli Lilly, Bristol-Myers Squibb, the University of Chicago, Massachusetts General ... World has hosted an elite awards program, highlighting outstanding examples of how technology ...
(Date:6/28/2020)... ... ... The Indoor Lab, a leading provider of sensor solutions for monitoring foot ... ensure cleanliness, distancing and occupancy with its patent pending WipeAway™ technology using Artificial Intelligence ... a health performance index system that scores all aspects of compliance similar to the ...
Breaking Biology Technology:
Cached News: