Investigators from the CONICET conducted an exhaustive monitoring of 65 Magellanic penguin colonies from Río Negro to Tierra del Fuego and the Falkland Islands.
The study, led by the Patagonian National Center (CENPAT), debunked the myth of a generalized decline of the species and revealed a dynamic system with expanding colonies.
The result was surprising: 1.34 million active pairs were counted in Argentina, with a positive long-term trend and an average annual increase close to 2%.
Expanding Colonies and Redistribution
The work showed that the population is not homogeneous:
- Large colonies like Punta Tombo are experiencing a decline.
- New and small colonies show high growth rates.
- A redistribution of individuals between colonies was identified, which responds to a metapopulation dynamic.
The species has expanded its reproductive distribution northward, with Islote Lobos being the northernmost colony in the country.
Applied Methodology
The team gathered information from 73 breeding colonies from scientific literature, technical reports, theses, and official and non-governmental monitoring. For the final analysis, 65 colonies with at least two years of abundance data were selected.
Two statistical approaches were applied:
- Simple weighted method: general overview of the entire coast.
- Empirical Bayesian approach: detailed analysis in colonies with more complete historical series.
A Broad and Dynamic System
Researcher Jésica Hombre highlighted that the national panorama is heterogeneous: “What happens in one region does not always represent what happens along the entire coast. There are new colonies that are small and have a good growth rate”.
The study demonstrates that Magellanic penguins are not limited to a few iconic colonies but are part of a broad system with constant exchange of individuals.
Importance for Conservation
The survey provides a solid basis for designing conservation strategies:
- Sentinel species: their population variations reflect changes in the marine ecosystem, food availability, and sea conditions.
- Territorial planning: allows identifying colonies in decline, expansion, and those requiring more monitoring.
- Priority conservation: defines strategic sectors where protection efforts should be focused.
The national study on Magellanic penguins reveals a globally stable and growing population, with over 1.3 million active pairs. Although some colonies are experiencing declines, others show expansion, confirming that the species functions as a dynamic system.
This finding reinforces the need for comprehensive monitoring and conservation policies that consider the diversity of scenarios along the Patagonian coast and the Falkland Islands.
