The new method extends a procedure familiar to biologists that involves investigating species numbers in relation to area (the species-area relationship, or SAR), by adding sophisticated statistical methods so that it can be used to describe the role of individual species in their impact on biodiversity.
This individualised method (‘individual species-area relationship’, or ISAR) makes it easier to identify key species. "We are effectively looking at diversity in the ecosystem through the glasses of the individual species," says co-author Dr Andreas Huth of the UFZ. This means that in future it will be easier to understand the role of individual species in ecosystems and to implement targeted protection measures for key species. In addition, the method can be used to investigate better the ecological consequences of changes in land use.
The researchers used their new method to evaluate unique data from two tropical rainforests in Sri Lanka and Panama that are part of a network coordinated by the Center for Tropical Forest Science (CTFS; http://www.ctfs.si.edu). Within this network, every single tree with a trunk thicker than a pencil has been mapped and monitored for years on about a dozen selected sample plots, some as large as 50 hectares, in tropical rainforests around the globe. The researchers compared in their study around 40 000 larger trees in the tropical rainforest on Barro Colorado Island, Panama, with those in the Sinharaja World Heritage Site in Sri Lanka.
To their surprise, more than two third of all species did not leave identifiable signatures on spatial diversity. The other tree species had an impact on local biodiversity only in their immediate surroundings, within a radius of up to 20 metres, but not on a large scale. These findings support the much-debated ‘neutral theory’, according to which species characteristics are unimportant for certain community attributes and play only a subsidiary role in the stability and diversity of ecosystems. The study reveals that the two tropical forests lacked any key species structuring species diversity at larger scales, suggesting that "balanced" species–species interactions may be a characteristic of these species rich forests. Dr Thorsten Wiegand says, "Biodiversity researchers have not been able to agree on which processes permit a high level of species diversity to emerge, and which processes keep these complicated systems stable".
On the research plot in Panama there were lots of ‘repellent’ species. By contrast, the one in Sri Lanka is dominated by ‘attractor’ species, i.e. species that promote biodiversity. "It is not yet known why these two tropical rainforests are so different in this regard" say Savitri Gunatilleke and her husband Nimal, both professors at the University of Peradeniya, "but our method is a leap forward in an understanding of the complexities of the origin and maintenance of species richness in tropical forests". After all, the method was being used for the first time. "We first used the new method in tropical rainforests, but it is universally applicable and can be used for plants in all ecosystems," says Dr Andreas Huth of the UFZ. The new method closes a gap between rather more crude descriptions of biodiversity (for the whole ecosystem) and extremely detailed analyses (interactions between individual species). In future then, the new method can also be combined with the forest simulation models already developed at the UFZ.
Doris Boehme | alfa
Fighting a destructive crop disease with mathematics
21.06.2017 | University of Cambridge
Unusual soybean coloration sheds a light on gene silencing
20.06.2017 | University of Illinois College of Agricultural, Consumer and Environmental Sciences
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
23.06.2017 | Physics and Astronomy
23.06.2017 | Physics and Astronomy
23.06.2017 | Information Technology