Population bottlenecks are when population size reduces for a short period of time. Overpopulation may indicate any case in which the population of any species of animal may exceed the carrying capacity of its ecological niche.
The name zirconium comes from the mineral zircon, which is the most important source of the metal. The largest deposits of this mineral are found in Australia, Brazil, Russia, India, South Africa and the United States. Australia and South Africa are the largest miners of the mineral.
Isotopes: Zirconium has 25 isotopes whose half-lives are known, with mass numbers 81 to 105. Naturally occurring zirconium is a mixture of five isotopes and they are found in the percentages shown: 90 Zr (51.5%), 91 Zr (11.2%), 92 Zr (17.1%), 94 Zr (17.4%) and 96 Zr (2.8%). The most naturally abundant is 90 Zr at 51.5%.