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01 / 05
Return of Wolves to Yellowstone Leads to Surge in Aspen Trees

Live Science | Forests

Return of Wolves to Yellowstone Leads to Surge in Aspen Trees

“Gray wolves had disappeared from Yellowstone National Park by 1930 following extensive habitat loss, human hunting and government eradication programs. Without these top predators, populations of elk grew unfettered. At their peak population, an estimated 18,000 elk ranged across the park, chomping on grasses and shrubs as well as the leaves, twigs and bark of trees like quaking aspen. This stopped saplings from establishing themselves, and surveys in the 1990s found no aspen saplings…

When wolves were reintroduced in 1995, the picture began to change. As wolf numbers rose, the elk population in the park dropped sharply, and it is now down to about 2,000.

In the new study, published Tuesday (July 22) in the journal Forest Ecology and Management, Painter and his colleagues surveyed aspen stands — specific areas of the forest where these trees grow.

The team returned to three areas surveyed in 2012 to examine changes to aspen sapling numbers. Of the 87 aspen stands studied, a third had a large number of tall aspen saplings throughout, indicating the trees are healthy and growing. Another third of the stands had patches of tall saplings.”

From Live Science.

L'Indipendente | Forests

In Italy, Forests Occupy a Third of the Territory, and Are Increasing

“Today, Italy is, in all respects, a forestry nation. The wooded areas have in fact exceeded 100 thousand square kilometers of extension and occupy over a third of the national territory. A figure that marks a significant change, for which from 2020 the forest area has exceeded the agricultural one used: a situation that had not been recorded since the Middle Ages. To photograph this transformation is the report Foreste in Comune, the first socio-economic survey on the forest heritage of the Italian municipalities promoted by PEFC Italia. The analysis shows that the forest has become a central component of the Italian landscape, with a whole series of benefits that derive from the increasingly widespread presence of forest ecosystems.”

From L’Indipendente.

Science | Forests

Earth’s Mangrove Forests Expand and Regrow over Four Decades

“Mangrove forests are coastal habitats that serve as nurseries for economically important fisheries. Natural disturbances such as cyclones and shore erosion, together with aquaculture, palm plantation, and rice paddy expansion, have led to global declines in mangrove forest cover, spurring national and international pledges to restore it. Zhang et al. created a 30-meter-resolution annual dataset from satellite imagery to assess how mangrove occurrence and canopy cover have changed from 1984 to 2023. Mangroves declined globally before 2010, but have mostly recovered since then, with both forest loss and degradation (declining canopy cover) rates slowing over time. Mangroves are mostly expanding into new habitats, but also regenerating in former habitat, suggesting hope for ecosystem recovery”

From Science.

The Guardian | Forests

Brazil’s Atlantic Forest Records Lowest Deforestation in 40 Years

“Brazil’s Atlantic forest, the country’s most threatened biome, last year recorded its lowest level of deforestation since monitoring began 40 years ago, a new report shows.

The forest is Brazil’s most populous biome, and home to 80% of the population and major cities such as Rio de Janeiro and São Paulo. In 2025 it recorded 8,658 hectares of deforestation, marking the first time it has fallen below 10,000 hectares since 1985.”

From The Guardian.

Mongabay | Forests

Listening to Forests Reveals Signs of Recovery Beyond Tree Cover

“While satellite data have shown an increase in forest cover, it’s been more challenging to assess whether the recovered forests have life thriving within them. More often than not, forest cover regeneration is considered the key metric of success in PES programs. Biodiversity assessments, however, are more difficult and expensive to implement over large areas…

Enter bioacoustics. For years, scientists have used this noninvasive technology — essentially placing microphones throughout the forest to record animal sounds — to conduct large-scale biodiversity assessments over wide swaths of forests. It’s also used to understand the behavior and communication patterns of animals…

Delgado and his team captured close to 16,658 hours of audio data from 119 sites across the Nicoya Peninsula in northwestern Costa Rica. They placed their audio recorders in protected areas, forests recovering under the PES program, monoculture plantations, and pastures, and retrieved them a week later. The sites that were sampled include 50 forests that were allowed to regrow naturally without any human intervention. These forests have been recovering after being abandoned for cattle ranching and farming for anywhere between 25 and 42 years.

After analyzing the data, they found that the sound profile of naturally regenerated forests under the PES program was very similar to that of protected forests. These patches were found to be ‘1.4 times more acoustically similar’ to protected forests than they were to pastures. ‘Healthy forests have strong peaks of acoustic activity right when the sun is coming up and going down,’ Delgado said. ‘Whereas in pastures, these are much less pronounced and the biggest peak is in the middle of the day when humans are active there.’

Biodiversity in monoculture timber plantations was also found to be recovering, but not as strongly as in naturally regenerated forests.”

From Mongabay.