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GS-III :
  • 03 August, 2020

  • 2 Min Read

Density Dependent dispersals

Density Dependent dispersals

Context

  • Scientists at the Pune-based Indian Institute of Science Education and Research (IISER) carried out experiments to study the phenomenon of ‘density-dependent dispersal’ by observing around 29,000 fruit flies to see if evolution had modified their tendency to move towards or away from crowded regions.

Study findings:

  • While females had been dispersing more than the males initially, the males overtook females in movement after evolution.
  • This finding is perhaps the first evidence of an evolutionary reversal in the dispersal of the two sexes.

Significance:

  • The study of biological dispersal finds applications in epidemiology, conservation of biodiversity as well as control of agricultural pests.
  • ‘Density-dependent dispersal’ is central to our understanding of which life forms occur where.
  • Some species live in large groups while others are solitary.
  • Similarly, movement occurs away from a crowd in some species and towards it in others. This pattern is termed ‘density-dependent dispersal’.
  • The study highlights the need to frequently assess movement patterns of ecologically relevant species.

Source: TH


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