Ecuador’s pumas show recent inbreeding as old population links fade

Whole-genome data suggest Andean climate history shaped puma connections, while recent fragmentation is separating populations.

Editorial illustration — not from the study.

Researchers generated whole-genome sequences from pumas living in ecologically different parts of Ecuador. Their results suggest that northwestern forest pumas survived in relatively stable habitats over the past 100,000 years, and that a period of greater climatic similarity about 17,000 years ago may have made it easier for pumas to move along the western Andes and Pacific coast.

The study also points to contrasting recent histories. A possible increase in puma population size followed the collapse of Indigenous human populations about 400 years ago, but fragmentation over the past 70 years appears to have separated historically connected populations. The authors identify different conservation needs for northwestern and southern pumas.

What the genomes show

The genomic results suggest that northwestern forest pumas persisted in environmentally stable habitats over the last 100,000 years. Around 17,000 years ago, greater climatic similarity may have reduced environmental barriers and supported movement between puma populations along the western Andean and Pacific coastal regions.

The researchers also suggest that puma population size increased after the collapse of Indigenous human populations about 400 years ago. Despite this longer-term history of movement and population change, the study reports the first genomic evidence of inbreeding in South American pumas. The results indicate that fragmentation during the past 70 years has disrupted connections between populations that were historically linked.

Different risks, different actions

The findings indicate that Ecuadorian pumas face different conservation risks rather than one uniform threat. Northwestern populations may need habitat corridors to maintain gene flow, the movement of genes between populations, while isolated southern populations may require more targeted measures to limit further loss of genetic diversity.

Evidence and limits

The study is based on whole-genome sequences from pumas in ecologically distinct regions of Ecuador, combined with analyses of past climate, population history and present-day genetic diversity. The abstract does not report the number of pumas sampled or the precise locations of every population, so the strength and geographic reach of the findings cannot be assessed from the available information alone. The links between climate history, human population changes and puma population size are inferred from genomic and environmental evidence; the study does not directly observe those past events.

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