Forschungszentrum Jülich - Press releases - Researchers Simulate Catastrophe
Scientists at the Helmholtz Centre for Environmental Research in Leipzig, Germany have been studying nocturnal desert geckos to see how. Flirt4Free hosts a wide variety of webcam girls in their adult chat rooms. From HD webcams, college girls and big boobs models to exotic, squirting shows. Possible reasons for such scenarios include an impending nuclear how procedures can be optimized for such emergencies using the main.
And the same is also true if excessive temperatures cause them to overheat. In fact, they are generally in better condition, and their populations grow rather than fall".
But what could be the reason? To discover this, Grimm-Seyfarth carefully observed the lizards' behaviour and measured their body temperature. At night, she used an infrared thermometer, which can measure temperature at a distance, to locate the creatures while they were hunting.
And then, to find where the geckos were hiding during the day, the scientists used tiny passive transmitters, similar to those used as ID chips for dogs.
These chips are usually implanted under the skin. But when the tiny reptile is only five centimetres long, this isn't really feasible. So, the scientists created miniature backpacks for the geckos to wear, which keep the chips close to their skin.
The researchers then use a radio antenna to locate the chips. The chips not only reveal where each lizard is, but also transmit its body temperature.
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Despite the tremendous daytime heat in the desert, the scientists discovered that the geckos don't search out particularly cool places to hide.
They prefer their refuges to have a temperature between 30 and 35 degrees Celsius. As Grimm-Seyfarth said, "The creatures need these high temperatures so that they can digest their food properly". Consequently, they also crawl around in branches that are particularly exposed to the sun. To her astonishment, Grimm-Seyfarth also found that, in cooler years, the geckos left the safety of their tree and deliberately sat out in the sun to bask in its heat.
But searching for enough warmth also takes energy. And, if the search is unsuccessful, the gecko can't digest its food properly. This might be the reason that cooler years had a negative effect on the geckos. However, even having the perfect temperature range isn't any good if it's also too dry. This doesn't just cause physical problems for these creatures. In particularly dry periods, there are also fewer insects for them to eat.
As expected, geckos experience really hard times during periods of drought. But it's not just local precipitation levels that are the decisive factor. Months later, the rivers bring the resulting flood waters to the desert, increasing humidity levels and creating an abundance of insects. As Grimm-Seyfarth said, "These lizards are affected by local conditions and global climate phenomena alike. We need to look beyond the horizon of a particular area if we want to make an accurate prediction about the future of its inhabitants.
Until now, all the evidence indicated that the geckos would face problems caused by drought rather than by heat. But now, we have discovered that they can also compensate for this, to a certain extent. The study shows that, although individual creatures become thinner in years of drought, their population levels remain constant. This is because they scale back their growth and reproduction rates in hard times", explained Grimm-Seyfarth.
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