Facts for Prelims (FFP)
Source: IITB
Context: A study by researchers at IIT Bombay, challenged the traditional view that new species can only develop in geographically isolated areas (allopatric speciation).
- Instead, it demonstrates that new species can evolve in the same area without geographic barriers, a process known as sympatric speciation.
- The study used a genetic-based model focusing on birds to investigate how environmental resources, genetic factors, and mating preferences contribute to sympatric speciation.
Key findings include:
- Disruptive Selection: Variations in environmental resources lead to different traits being favoured, such as birds developing different beak sizes to utilize specific food resources. This helps maintain distinct groups within the same population.
- Sexual Selection: Contrary to previous beliefs, mating preferences based on advantageous traits (like beak size) rather than arbitrary traits (like feather colour) drive sympatric speciation.
- Genetic Architecture: The genetic control of traits significantly impacts the likelihood of new species forming. Genetic flexibility in traits like beak size facilitates speciation even with minimal disruptive selection.
