Biological invasions have well-known direct effects on native ecosystems but may also unleash forces with complex, unexpected consequences. These ecological surprises may be especially common in simple systems, like islands, following introduction of megainvaders, like tramp ants.
In the September issue of Ecology Letters, ODowd, Green, and Lake show that impacts of invasion by the crazy ant Anoplolepis gracilipes ramify through the food web in rainforest on Christmas Island, totally reconfiguring this ecosystem in just 1-2 years.
On the forest floor, crazy ant supercolonies extirpate the dominant native omnivore, which indirectly increases seedling recruitment but slows litter decomposition. In the forest canopy, new ant-Homoptera partnerships accelerate, exacerbate, and diversify impacts. Sustained high densities of ants are associated with outbreaks of host-generalist scale insects and honeydew-dependent sooty moulds, leading to canopy dieback and even tree deaths.
Kate Stinchcombe | alfa
Rethinking the science of plastic recycling
24.10.2019 | DOE/Argonne National Laboratory
Sinking groundwater levels threaten the vitality of riverine ecosystems
04.10.2019 | Albert-Ludwigs-Universität Freiburg im Breisgau
Carbon nanotubes (CNTs) are valuable for a wide variety of applications. Made of graphene sheets rolled into tubes 10,000 times smaller than a human hair, CNTs have an exceptional strength-to-mass ratio and excellent thermal and electrical properties. These features make them ideal for a range of applications, including supercapacitors, interconnects, adhesives, particle trapping and structural color.
New research reveals even more potential for CNTs: as a coating, they can both repel and hold water in place, a useful property for applications like printing,...
If you've ever tried to put several really strong, small cube magnets right next to each other on a magnetic board, you'll know that you just can't do it. What happens is that the magnets always arrange themselves in a column sticking out vertically from the magnetic board. Moreover, it's almost impossible to join several rows of these magnets together to form a flat surface. That's because magnets are dipolar. Equal poles repel each other, with the north pole of one magnet always attaching itself to the south pole of another and vice versa. This explains why they form a column with all the magnets aligned the same way.
Now, scientists at ETH Zurich have managed to create magnetic building blocks in the shape of cubes that - for the first time ever - can be joined together to...
Quantum-based communication and computation technologies promise unprecedented applications, such as unconditionally secure communications, ultra-precise...
In two experiments performed at the free-electron laser FLASH in Hamburg a cooperation led by physicists from the Heidelberg Max Planck Institute for Nuclear physics (MPIK) demonstrated strongly-driven nonlinear interaction of ultrashort extreme-ultraviolet (XUV) laser pulses with atoms and ions. The powerful excitation of an electron pair in helium was found to compete with the ultrafast decay, which temporarily may even lead to population inversion. Resonant transitions in doubly charged neon ions were shifted in energy, and observed by XUV-XUV pump-probe transient absorption spectroscopy.
An international team led by physicists from the MPIK reports on new results for efficient two-electron excitations in helium driven by strong and ultrashort...
An international research group has observed new quantum properties on an artificial giant atom and has now published its results in the high-ranking journal Nature Physics. The quantum system under investigation apparently has a memory - a new finding that could be used to build a quantum computer.
The research group, consisting of German, Swedish and Indian scientists, has investigated an artificial quantum system and found new properties.
05.11.2019 | Event News
30.10.2019 | Event News
02.10.2019 | Event News
13.11.2019 | Life Sciences
13.11.2019 | Machine Engineering
13.11.2019 | Life Sciences