# Forest Structure Outweighs Topography in Biodiversity Impact Pollino National Park study reveals key ecological drivers of plant diversity - **Source:** [Phys.org - latest science and technology news stories](https://brifing.si/source/8b0f98da-d179-4c93-871f-7ac460bf9c61) - **Published:** 2026-09-17 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/28fb9709-e8bc-4b72-9419-6709eaa6ced6 ## Key biodiversity drivers identified The Pollino National Park study demonstrates that forest structural elements like large trees, complex canopy layers, and diverse deadwood contribute more significantly to vascular plant diversity than topographic factors. This challenges previous assumptions about primary environmental influences in old-growth forest ecosystems, particularly in the Southern Apennine mountain range of Italy. ## Structural complexity matters Researchers found that the physical architecture of forests - including variations in tree size, canopy stratification, and decaying wood distribution - creates more ecological niches and microhabitats than terrain variations. This structural diversity supports a wider range of plant species than previously understood in Mediterranean old-growth forest systems. ## Conservation implications The findings emphasize protecting not just forest area but structural complexity in conservation efforts. Maintaining large veteran trees and allowing natural deadwood accumulation appear crucial for sustaining biodiversity in these ancient woodland ecosystems, which represent some of Italy's most ecologically valuable forest landscapes. ## Methodological approach Scientists conducted comprehensive vegetation surveys across varying topographic conditions in Pollino National Park, comparing plant communities in areas with different forest structures. They measured multiple structural parameters including tree diameter distribution, canopy layering, and deadwood volume and diversity. ## Southern Apennine significance The study area represents one of Italy's last remaining old-growth forest systems in the Mediterranean biogeographic region. These forests contain unique assemblages of vascular plants that have developed over centuries with minimal human disturbance, making them valuable reference ecosystems. ## Management recommendations Researchers suggest forest management practices should prioritize maintaining structural heterogeneity rather than focusing solely on tree species composition. This includes preserving large old trees and allowing natural processes like treefall and decomposition to create habitat complexity. ## Ecological relationships The study reveals how different structural elements support distinct components of plant diversity. Large trees provide unique microhabitats in their crowns and bark, while diverse deadwood supports different decay-stage specialists, together creating a mosaic of ecological conditions. ## Future research directions Scientists recommend expanding similar studies to other Mediterranean old-growth forests to test the universality of these findings. They also highlight the need for long-term monitoring to understand how structural complexity affects biodiversity resilience to climate change in these ecosystems. ## Sources covering this story - https://phys.org/news/2026-09-forest-topography-diversity-southern-apennine.html — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._