An exotic species or weed trying to establish itself in a new ecosystem will have a harder time if it encounters a diverse mix of resident species rather than just a few species, according to research at the University of Minnesota. Working with prairie plants, the research team found that a rich assemblage of species repels invaders because it is more likely to contain plants occupying a niche similar to what the invader needs, as well as plants that make good all-around competitors. The findings have implications for land managers, suggesting that maintaining the native diversity of species can help keep out weeds and exotic species. The study is published in the current Proceedings of the National Academy of Sciences.
"Our study suggests that invading species that resemble resident species are less likely to get established," said Joseph Fargione, a graduate student in the universitys department of ecology, evolution and behavior and first author of the study. "This makes it difficult to predict which exotic species will become problem weeds by studying the weeds alone. Their success actually depends to a large extent on the characteristics of the species already present in the ecosystem."
The researchers worked with nine-square-meter plots of land at the universitys Cedar Creek Natural History Area in southern Minnesota. The plots contained between one and 24 species of prairie plants that had become well established, with 20-24 replicates at each level of diversity. The researchers introduced a mix of seeds from 27 other plants, all native to the area, to each plot. All the plants fell into one of four types, or "guilds": warm-season grasses, cool-season grasses, legumes and forbs.
Deane Morrison | EurekAlert!
Nanoparticle Exposure Can Awaken Dormant Viruses in the Lungs
16.01.2017 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt
Cholera bacteria infect more effectively with a simple twist of shape
13.01.2017 | Princeton University
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.
The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
17.01.2017 | Earth Sciences
17.01.2017 | Materials Sciences
17.01.2017 | Architecture and Construction