The phrase "king of the jungle" invariably conjures up the image of a majestic, tawny cat with a fluffy mane framing its face. But in fact not all male lions have big hair. In Kenyas Tsavo National Park--famed for the man-eating lions that reportedly terrorized railroad workers there in the late 1800s--a number of males lack manes altogether. Exactly why this should be the case--or why any lions should have manes, for that matter--has been difficult to explain. To that end, the results of a new study, published online today by the Canadian Journal of Zoology, could prove insightful.
Image: John Weinstein/Courtesy of the Field Museum
Over the years, researchers have put forth several social hypotheses aimed at explaining the main function of the mane in these group-living felines, ranging from intimidation (a big mane makes an animal look bigger) to physical protection for the head and neck areas from other lions to sex appeal. At the same time, however, manes are expensive: they offer unnecessary and perhaps harmful insulation to beasts in hot areas, they make the animals more conspicuous to both prey and competitors, and all that extra hair provides more stuff for thorns and brambles to latch onto.
To shed some light on the matter, Roland Kays of the New York State Museum in Albany and Bruce Patterson of the Field Museum in Chicago set out to test one of the social hypotheses: that mane size should vary as a function of female group size. According to this model, increased female group size should ratchet up the sexual selection pressure for long, flowing manes on males. Males with reduced or nonexistant manes, in contrast, should predominate in areas characterized by smaller female groups.
Kate Wong | Scientific American
Cryo-electron microscopy achieves unprecedented resolution using new computational methods
24.03.2017 | DOE/Lawrence Berkeley National Laboratory
How cheetahs stay fit and healthy
24.03.2017 | Forschungsverbund Berlin e.V.
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy