By studying how plants in three hyper-diverse grasslands change annually over a decade, ecologists Jason Fridley (University of North Carolina, Chapel Hill), Robert Peet (University of North Carolina, Chapel Hill), Eddy van der Maarel (University of Groningen), and Jo Willems (Utrecht University) show how one crucial property of ecosystems--the species-area curve, describing the relation of area and number of species--cannot be fully understood unless annual changes in the species composition of local communities are taken into account.
Reporting in The American Naturalist, Fridley and colleagues demonstrate, for the first time, that "local" species-area curves (those confined to one community) and those of large regions can be linked if one considers that the species composition of small areas changes faster than that of larger areas.
"It is increasingly clear," says Fridley, "that plant communities are dynamic entities in which variation in space and time are inextricably linked."
Indeed, ecologists have argued for decades over why species-area curves measured locally do not seem to match predictions derived from larger areas. This study shows that smaller surveys are heavily constrained by the poor sample size of individuals in any given year. Over time, as individuals die and are replaced by others from the surrounding area, the sample size increases and the community begins to more resemble its region--but in a manner that strictly follows the region's species-area curve.
This novel connection of local and regional biodiversity patterns extends the generality of the species-area relationship to very small areas, and thus allows ecologists to explicitly link processes that drive biodiversity across scales.
Suzanne Wu | EurekAlert!
Preservation of floodplains is flood protection
27.09.2017 | Technische Universität München
Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
20.10.2017 | Information Technology
20.10.2017 | Materials Sciences
20.10.2017 | Interdisciplinary Research