The Black Woodpecker Reveals the State of the Forests in Southern Chile

A scientific study revealed that the black woodpecker —also known as the Magellanic woodpecker— can function as a key indicator for measuring the health of the temperate forests in southern Chile. The research demonstrates that the presence and activity of this bird is closely linked to the biodiversity inhabiting the trees, especially in decaying wood.

The work, published in the journal Insect Conservation and Diversity, analyzed how the woodpecker's foraging behavior relates to the diversity of saproxylic beetles, insects that live in dead wood and play an essential role in nutrient recycling within forest ecosystems.

Greater Biodiversity Where the Woodpecker Excavates

The research was conducted in 22 plots of native forest, where scientists examined 132 living trees. The results showed a clear difference: trees perforated by woodpeckers while foraging harbored much greater biodiversity than those where the bird did not intervene.

In total, 297 species of wood-associated beetles were recorded, of which 257 were found in trunks intervened by the woodpecker, compared to 159 species detected in trees without bird activity.

An Ecosystem "Thermometer"

As explained by Silvio Crespin, an academic from the Faculty of Veterinary Medicine and Agronomy at the University of Las Américas and co-author of the study, the woodpecker's activity allows for the indirect observation of the health of the decomposer insect community.

The researcher noted that the abundance and diversity of predatory beetles, wood borers, and mycophagous beetles was greater in areas where the Magellanic woodpecker had foraged. Therefore, monitoring its presence can provide reliable information about the biodiversity that sustains the forest's functioning.

The study was developed by an interdisciplinary team composed of researchers from the University of Santiago de Chile, the Institute of Ecology and Biodiversity, and CONAF, with international collaboration from the Tropical Research Institute of El Salvador.

Vulnerable Ecological Networks

Scientists warn that saproxylic beetles are part of an ecological network very sensitive to environmental factors such as temperature and humidity. In this context, phenomena like climate change or forest degradation can alter this balance.

Crespin explained that conditions such as increased droughts can modify the woodpecker's tree selection patterns and affect the entire ecological chain that connects dead wood, the insects that decompose it, and the birds that depend on them.

One of the central points of the study is the importance of decaying wood within forests. Far from being waste that should be removed, it constitutes a key resource for biodiversity.

Currently, Law No. 20,283 on native forest recovery does not establish minimum levels of deadwood for conservation, a gap that researchers hope future studies will help address.

The scientists conclude that protecting the black woodpecker as an "umbrella species" safeguards not only this emblematic bird but also a complex network of insects and microorganisms fundamental for the regeneration of the planet's southernmost forests.