In testing varying reintroduction scenarios with the NEWGARDEN software, the UC team simulated natural population development and found
* To ensure the greatest population growth rate and genetic diversity retention among the original founders and offspring trees, an original planting of a stand of 169 founders should be 1,500 meters (about 1,640 yards) into the preserve’s borders. Said Kashimshetty, “If you plant near the edge of a preserve, you risk slower population growth and greater loss of genetic variation due to offspring dispersal out of the preserve.”
* By simply planting the founder trees 1,500 meters into the preserve and planting the original founder trees in a grid 16 feet apart from one another, the result in 101 years’ time should be about 7,000 trees.
* At least 9,000 resulting trees would be possible in 101 years’ time by moderate dispersal (manually moving) of offspring seeds or seedlings to greater distances from the founders than would occur naturally.
* If the original stand of trees is planted at the edge of the preserve, it’s estimated that the original stand of 169 trees would result in approximately 2,000 resulting trees in 101 years’ time. Thus, by planting the trees further into a preserve at 1,500 meters, with proper spacing, it’s estimated that 247 percent more trees will result in 101 years’ time.
* Even planting the founder trees only 500 meters (1,640 feet) into the preserve vs. planting founders on the preserve’s edge would increase the population size by 148 percent in 101 years’ time.
* Further, by planting the original founder trees just 500 meters into the preserve, 97 percent of their genetic diversity is preserved. Thus, if the goal is only to preserve genetic diversity without regard for achieving maximum population size, it’s sufficient to plant the original stand 500 meters (1,640 feet) into the preserve.
Through such comparative computer modeling, the goal is to provide improved guidelines for the spacing and geometric patterning of founding trees in restoration plantings of American Chestnut, leading to a more successful return of this threatened but important native to the eastern forests of North America.
M.B. Reilly | Newswise Science News
Kakao in Monokultur verträgt Trockenheit besser als Kakao in Mischsystemen
18.09.2017 | Georg-August-Universität Göttingen
Ultrasound sensors make forage harvesters more reliable
28.08.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy