Navigation Links
Diversity of trees in Ecuador's Amazon rainforest defies simple explanation

Trees in a hyper-diverse tropical rainforest interact with each other and their environment to create and maintain diversity, researchers report in the Oct. 24 issue of the journal Science. This study was conducted in the Yasuni forest dynamics plot of the Pontificia Universidad Catlica del Ecuador, the most diverse tropical forest site associated with the Center for Tropical Forest Science/Smithsonian Institution Global Earth Observatory network (CTFS/SIGEO).

It is difficult to determine the effects of climate change, habitat fragmentation and species extinctions on life's diversity without a coherent model of how communities are organized; but a unified theory of diversity patterns in ecological communities remains elusive. The most complex biological systemssuch as tropical rainforestsare the most important testing grounds for theories that attempt to generalize across ecological communities; as they pose the greatest challenge. At Yasuni, in addition to the 600 species of birds and 170 of mammals, there are approximately 1,100 species of trees in the 25 hectare plot―more than in all of the U.S. and Canada, combined.

In 2001 Stephen Hubbell, a scientist at the Smithsonian Tropical Research Institute and professor at the University of California, Los Angeles proposed a neutral theory of biodiversity based on more than 20 years of data from the original long-term forest dynamics plot on Barro Colorado Island, which he co-founded in 1980. The methods that Hubbell and his colleagues at the Smithsonian established to study tropical forests in Panama were so useful that other institutions worldwide adopted the same methodologies. The plot in Ecuador was established in 1995 by researchers from the Universidad Catolica, Aarhus University in Denmark and the Smithsonian in Panama.

"The global reach of the CTFS/SIGEO forest monitoring network, and the power to test theories of biodiversity depend entirely on independently motivated researchers who study trees in places from Yasuni to Papua New Guinea, on the other side of the world," said Eldredge Bermingham, director of the Smithsonian in Panama.

Neutral theory rests on the assumption that all species are equal in terms of their ability to survive and reproduce. Chance events drive change. This study supports an alternative, older explanation that characteristics of individual species play an important role in determining the structure of the community, contributing to the maintenance of biodiversity through distinct strategies.

"If the neutral theory is correct, we would expect these traits to be distributed at random throughout the forest, but that was not the case," explained RenatoValencia, professor at Pontificia Universidad Catlica del Ecuador and lead investigator at the Yasuni forest plot.

Nathan Kraft, PhD candidate at the University of California, Berkeley, measured and compiled traits of the leaves, seed and wood of trees at Yasuni and then used detailed maps from the plot to look at how these traits are distributed across the forest.

"The traits we measured give us important clues about the strategy of each species in the forest how they make a living, if you will. One exciting thing that we found is that trees growing near each other in basically the same habitat, may employ very different strategies," Kraft explained.

More research will be needed to resolve these conflicting views, and participants in the CTFS/SIGEO network of more than 30 forest dynamics plots in 17 countries hope that researchers will take advantage of standardized life-table data from more than 6,500 tree species to understand the patterns of biological diversity across the world.


Contact: Beth King
703-487-3770 ext. 8216
Smithsonian Tropical Research Institute

Related biology news :

1. Coral reef fish harbor an unexpectedly high biodiversity of parasites
2. Spatial patterns in tropical forests can help to understand their high biodiversity
3. Hydrothermal vents: Hot spots of microbial diversity
4. Upper Midwest forests are losing diversity, complexity, ISU study finds
5. NAS Biodiversity and Extinction Meeting Dec. 7-8
6. How global is the Global Biodiversity Information Facility?
7. Single-largest biodiversity survey says primary rainforest is irreplaceable
8. Are current projections of climate change-impacts on biodiversity misleading?
9. GBIF making the search for biodiversity research resources easier
10. New study finds biodiversity conservation secures ecosystem services for people
11. Study of bear hair will reveal genetic diversity of Yellowstones grizzlies
Post Your Comments:
Related Image:
Diversity of trees in Ecuador's Amazon rainforest defies simple explanation
(Date:10/29/2015)... 29, 2015 Today, LifeBEAM , ... with 2XU, a global leader in technical performance ... hat with advanced bio-sensing technology. The hat will ... monitor key biometrics to improve overall training performance. ... two companies will bring together the most advanced technology, ...
(Date:10/26/2015)... India , October 26, 2015 ... --> adds ... 2015 to 2021 as well as ... 2015-2019 research reports to its collection ... . --> ...
(Date:10/23/2015)... GOLETA, California , October 23, 2015 ... Instruments (SMI) announce a mobile plug and play integration ... interactive real-world tasks SensoMotoric Instruments (SMI) ... established wearable solutions for eye tracking and physiological data ... with SMI Eye Tracking Glasses 2w and ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... Studies reveal the differences in ... pave the way for more effective treatment for one of ...   --> --> Gum ... in cats, yet relatively little was understood about the bacteria ... been conducted by researchers from the WALTHAM Centre for Pet ...
(Date:11/25/2015)... /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS; TSX: AEZ) ... remain fundamentally strong and highlights the following developments: ... DSMB recommendation to continue the ZoptEC Phase 3 ... final interim efficacy and safety data , ... with heavily pretreated castration- and Taxane-resistant prostate cancer ...
(Date:11/25/2015)... Oregon , November 25, 2015 ... Market Research Report is a professional and in-depth ... industry.      (Logo: ) ... overview of the industry including definitions, classifications, applications ... is provided for the international markets including development ...
(Date:11/24/2015)... ... , ... The United States Golf Association (USGA) today announced Dr. Bruce Clarke, ... annually since 1961, the USGA Green Section Award recognizes an individual’s distinguished service to ... Clarke, of Iselin, N.J., is an extension specialist of turfgrass pathology in the department ...
Breaking Biology Technology: