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
University of California - Davis

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:

(Date:6/22/2016)... , June 22, 2016 On Monday, the ... to industry to share solutions for the Biometric Exit ... Customs and Border Protection (CBP), explains that CBP intends ... departing the United States , in ... to defeat imposters. Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/20/2016)... 20, 2016 Securus Technologies, a leading ... for public safety, investigation, corrections and monitoring announced ... it has secured the final acceptance by all ... Managed Access Systems (MAS) installed. Furthermore, Securus will ... be installed by October, 2016. MAS distinguishes between ...
(Date:6/15/2016)... ALBANY, New York , June 15, 2016 ... published a new market report titled "Gesture Recognition Market ... Trends and Forecast, 2016 - 2024". According to the ... at USD 11.60 billion in 2015 and is ... and reach USD 48.56 billion by 2024.  ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... HOUSTON , June 23, 2016 ... agreement with the Cy-Fair Sports Association to serve ... of the agreement, Houston Methodist Willowbrook will provide ... education and connectivity with association coaches, volunteers, athletes ... partner with the Cy-Fair Sports Association and to ...
(Date:6/23/2016)... ... 2016 , ... Supplyframe, the Industry Network for electronics hardware ... . Located in Pasadena, Calif., the Design Lab’s mission is to bring together ... built and brought to market. , The Design Lab is Supplyframe’s physical representation ...
(Date:6/23/2016)... , June 23, 2016 ... Hematology Review, 2016;12(1):22-8 http://doi.org/10.17925/OHR.2016.12.01.22 ... , the peer-reviewed journal from touchONCOLOGY, Andrew ... escalating cost of cancer care is placing an ... result of expensive biologic therapies. With the patents ...
(Date:6/23/2016)... , June 22, 2016  Amgen (NASDAQ: ... of the QB3@953 life sciences incubator to ... health. The shared laboratory space at QB3@953 was created ... a key obstacle for many early stage organizations - ... of the sponsorship, Amgen launched two "Amgen Golden Ticket" ...
Breaking Biology Technology:
Cached News: