The Hooded Grebe was discovered in 1974 by Mauricio Rumboll and Eduardo Shaw at Laguna de Los Escarchados, Santa Cruz. Its identification marked a milestone for Argentinian ornithology, as it is an endemic species of Southern Patagonia and exclusively nests in Argentina.
During the breeding season, it inhabits high-altitude lakes and lagoons on the plateaus of Santa Cruz, and in winter it migrates to the estuaries of the Coyle, Gallegos, and Santa Cruz rivers.
Population Decline and Its Causes
In the initial monitoring, the population seemed stable. However, by the late 2000s, counts revealed an alarming decline: from an initial estimate of 3,000 to 5,000 individuals, fewer than 800 specimens were recorded in 2009.
The threats were multiple:
- Droughts and climate change: fewer available lagoons and windstorms that destroy floating nests.
- Invasive species: the American mink preyed on adults and chicks; the introduced trout deteriorated the aquatic environment.
- Human impact: waste and settlements favored the proliferation of the Kelp Gull, a nest predator.
Conservation Strategies
Since 2012, researchers from Conicet and the Hooded Grebe Foundation have implemented concrete measures:
- Control of minks through trapping and tracking dogs.
- Reduction of trout in lagoons.
- Reproductive control of Kelp Gulls.
- Recovery of “ecologically lost” eggs: each pair lays two, but raises one; the second is rescued, raised in specialized centers, and then released.
This protocol took almost a decade to develop. In recent years, they managed to raise and release three individuals, and in the last season, they counted 100 juveniles migrating, an encouraging sign of stabilization.
A Collective Effort
The conservation of the Hooded Grebe is an interdisciplinary effort that combines applied ecology, satellite monitoring, and community participation. The Bariloche Foundation and scientific teams like Laura Fasola emphasize that sustaining these programs in South America is a huge challenge but essential for preserving biodiversity.
The bird has become a flagship species, a symbol of the fight against climate change and invasive species in Patagonia. Its protection also involves conserving the high-altitude ecosystems and lagoons that sustain life in Santa Cruz.
The Hooded Grebe reflects the fragility and resilience of Patagonia. Its survival depends on maintaining conservation efforts in the face of growing threats. Protecting it not only means saving a unique bird but also preserving the high-altitude ecosystems and the natural legacy of the region.
