Daily News Analysis

Pseudomelanistic tigers in Odisha                 

14th September, 2021 Environment


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Context: An estimated 37% of Panthera tigris in the Similipal Tiger Reserve (in eastern India) are pseudomelanistic, characterised by wide, merged stripes.


What lead to the pseudomelanistic tigers?

  • This is the result of a rare mutation in one gene, Transmembrane Aminopeptidase Q or Taqpep, recessively inherited variants of which are responsible for the marks in domestic cats and king cheetahs.
  • The mutation is rarely seen in tigers outside Similipal.
  • With shrinking habitats, the tiger population becomes increasingly isolated.
  • This causes inbreeding, resulting in a lack of genetic variation, making them prone to extinction.
  • For the endangered animal to survive and thrive in the wild, there needs to be more genetic variation.
  • The population at Similipal Tiger Reserve is small and potentially disconnected from other populations.
  • Genetic rescue should benefit the population by increasing heterozygosity and decreasing the probability of inbreeding depression. Careful consideration would be required when selecting the immigrant.