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10-05-2016, 10:20 AM( This post was last modified: 10-05-2016, 08:52 PM by GrizzlyClaws )
The few remaining ancient tiger subspecies that survived after the Toba Eruption had to re-integrate with each other in order to thrive their decreasing population.
The Amur tiger was the re-combination of the Caspian tiger and the remaining Wanhsien tiger, while the Bengal tiger shared a most recent ancestor with the Indochinese tiger, and they probably did absorb/assimilate some leftover population of the ancient South China tiger or Sunda tiger in India. BTW, theoretically there could have a precedent tiger population that dispersed in India before the expansion of the Bengal tiger. But these tigers' attempt wasn't successful because India wasn't entirely jungle prior to the Holocene era. The Pleistocene grassland landscape of India was definitely more suitable for lions than tigers.
Amur tiger = Caspian tiger + Wanhsien tiger
Bengal tiger = ancient Indochinese tiger (probably having little ancient South China tiger or Sunda tiger)