How do aquatic invertebrates such as water fleas move between isolated waterbodies so as to colonize new habitats or maintain genetic exchange between populations? Darwin and other XIX century naturalists proposed that they move via waterbirds. Dispersal was proposed to occur when birds fly between ponds with eggs attached to their feathers or legs or with eggs inside their guts.
To address this question, Jordi Figuerola, Andy J. Green, and Thomas C. Michot combined data from previous studies of genetic differences between populations of invertebrates across North America with the movements of waterfowl as quantified by band-recovery data collected by amateur and professional ornithologists. They found that, for 3 out of 4 invertebrate species studied, bird movements give the best explanation for the genetic differences between populations, suggesting that waterbirds were the main agents of dispersal. The genetic distance between two populations depended more on the likelihood of birds moving between those localities than on the geographical distance between them.
This is the most solid evidence to date that dispersal via migratory waterfowl has a major influence on the population genetics of invertebrates. Some invertebrates are better at dispersing via birds than others. If researchers can learn to identify the features that make an invertebrate a good disperser, they will improve the understanding of how the composition of native aquatic communities is determined and why some introduced species are more invasive than others.
Carrie Olivia Adams | EurekAlert!
Making fuel out of thick air
08.12.2017 | DOE/Argonne National Laboratory
‘Spying’ on the hidden geometry of complex networks through machine intelligence
08.12.2017 | Technische Universität Dresden
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
An interdisciplinary group of researchers interfaced individual bacteria with a computer to build a hybrid bio-digital circuit - Study published in Nature Communications
Scientists at the Institute of Science and Technology Austria (IST Austria) have managed to control the behavior of individual bacteria by connecting them to a...
Physicists in the Laboratory for Attosecond Physics (run jointly by LMU Munich and the Max Planck Institute for Quantum Optics) have developed an attosecond electron microscope that allows them to visualize the dispersion of light in time and space, and observe the motions of electrons in atoms.
The most basic of all physical interactions in nature is that between light and matter. This interaction takes place in attosecond times (i.e. billionths of a...
Transistors based on carbon nanostructures: what sounds like a futuristic dream could be reality in just a few years' time. An international research team working with Empa has now succeeded in producing nanotransistors from graphene ribbons that are only a few atoms wide, as reported in the current issue of the trade journal "Nature Communications."
Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the...
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08.12.2017 | Life Sciences
08.12.2017 | Information Technology
08.12.2017 | Information Technology