Ancient lakes as research models Ranging from 1 to about 30 million years in age, the earth’s oldest extant lakes are regarded as the aquatic equivalents of islands, and typically harbor very high levels of endemic fauna (Brooks 1950; Martens 1997;
Cristescu et al. 2010). These ancient lakes have revealed many rapid, adaptive, and nonadaptive radiation events and have provided considerable insights into the major driving forces of speciation; they serve as natural model systems for research into evolution and speciation (Scho¨n and Martens 2004;
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