Tag Archives: population

South Africa: Low Levels of Genetic Diversity Are Putting Great White Sharks At Risk

… creatures. Research on the DNA of white sharks around the South African coastline shows that the population has extremely low geneticdiversity. This finding holds serious implications for their survival and more analysis is being done to try and understand this unexpected outcome and predict its consequences for the future of the species. What genetic diversity tells us Genetic diversity is an important indicator of the health status of a population in the wild: the higher the diversity, the …

A cray-active solution for cancer research

… new environmental conditions such as diet, population density or temperature. “Epigenetic factors may also influence cancer risk and play a role in the clinical development of the disease,” says Lyko. For example, colleagues at DKFZ have recently shown that epigenetics plays a major role in medulloblastoma, an aggressive brain tumour in children (DKFZ PM Nr. 30/2014). Lyko explains that, “in order to understand the basics of epigenetics, we need models. The usual mouse and rat …

Frodo’s basement: Secret chamber found where hobbit humans lived 

… long after other early human species, including the Neanderthals, had disappeared. Yet controversy remains over whether the hobbit is a separate species, or simply a population of unusually small Homo sapiens, at least one of whom had some form of disease that impaired brain development. This, sceptical researchers say, explains why the single hobbit skull found to date had a brain no larger than a chimpanzee. Hidden entrance More bones would finally lay the debate to rest, but so far searches …

Climate change raises cat threat 

… would have. Under one grim 2070 model, climate change could widen the range of areas suitable for feral cats, bringing them closer to conservation hotspots in new places like the central North Island, and the top and central areas of the South Island. Dr Aguilar’s previous work has demonstrated links between human population density, economic deprivation and the occurrence of stray cats, showing that a dense population generally indicated stray cats would be present. In Auckland, an …