Genetics and Small Populations

When species decline to small numbers, they face a hidden threat: genetic bottlenecks. Small populations lose genetic diversity through inbreeding, reducing disease resistance, reproductive success, and ability to adapt to changing conditions.

The Florida panther dropped below thirty individuals in the 1990s, causing severe inbreeding depression — heart defects, kinked tails, and low sperm counts. Introducing eight female Texas cougars restored genetic diversity and saved the subspecies.

Conservation genetics has become essential for species management. Scientists use DNA analysis to guide breeding programs, identify distinct populations, and detect illegal wildlife trade through genetic fingerprinting.