A six-year study at the world’s largest experimental landscape devoted to the corridors — links between otherwise isolated natural areas — has found that more plant species, and specifically more native plant species, persist in areas connected by the corridors than in isolated areas. The results suggest that corridors are an important tool not only for preserving wildlife but also for supporting and encouraging plant biodiversity.
“From the perspective of whether corridors are an important conservation tool, the big question is whether they preserve a large diversity of species,” said Doug Levey, a UF professor of zoology. “The answer, for plants anyway, appears to be yes.”
Levey co-authored a paper on the study set to appear Friday in the journal Science.
In recent decades, many states and communities have set aside land for wildlife corridors. They are even planned on a regional scale, with one proposed corridor, for example, stretching 1,800 miles from Yellowstone National Park to the Yukon Territory.
The rationale behind the corridors is that linking natural areas allows plants and animals to spread across them, helping them to thrive, reducing localized extinctions and increasing biodiversity. But until recently, scientific evidence for that rationale was surprisingly slim, with most corridor studies conducted on very small scales.Levey and his colleagues’ massive outdoor experiment at the Savannah River Site National Environmental Research Park on the South Carolina-Georgia state line is steadily filling in the holes in scientists’ knowledge.
The site consists of eight sets of five roughly two-acre clearings in the forest. In each set, a corridor connects the central clearing to one peripheral clearing, with the others remaining isolated. Plants and animals thrive in the clearings, which consist of longleaf pine savannah, an endangered habitat. They do not do well in the areas of surrounding forest. The difference between the habitats is similar to the difference between the urban and natural areas, where corridors are most often used.
In two earlier papers, the researchers concluded that corridors encourage the movement of plants and animals across the fragmented landscapes. They also found that bluebirds transfer more berry seeds in their droppings between connected habitats, suggesting that the corridors could help plants spread.
The latest research tackled a much broader question: Do corridors increase plant biodiversity overall? To get at the issue, researchers Ellen Damschen and Nick Haddad, of North Carolina State University, did a detailed census of evenly distributed plots in six sets of connected and unconnected patches. They started in summer 2000 and returned every year through 2005 except for 2004, when a fire burned the landscape.
The site was set up in 1999, when forest service loggers carved out the plots, and there was little difference among plot covers just one year later in 2000. But a different pattern became clear in ensuing years. Not only were there more plant species in connected plots than unconnected ones, there were more native species.
“They started with the same diversity and then diverged,” Levey said. “Native species definitely benefited, and yet there was absolutely no evidence that exotic species benefited.”
The difference arose because unconnected patches gradually lost native species, whereas the natives persisted in connected patches. Over the five years, the unconnected patches lost about 10 native species. Meanwhile, the corridors seemed to have no impact on the number of exotic or invasive species in the connected and unconnected patches.
“It seems that exotic species either were already everywhere and did not rely on corridors for their spread, or they remained in one place,” Damschen said in an e-mail.
Levey said the scientists think that invasive species, which by definition are good at spreading, are little affected by corridors. Native species, by contrast, are less invasive and so assisted more by the corridors. “It may be that corridors play to the strengths of native species,” he said.
Levey said the National Science Foundation recently renewed a five-year grant to continue research at the site, committing about $500,000 for another five years.
Doug Levey | EurekAlert!
Dune ecosystem modelling
23.06.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
Understanding animal social networks can aid wildlife conservation
23.06.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
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