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How do old-growth forests support biodiversity?
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forestry
Trucks on a road transporting recently harvested logs near Sabah's border with Kalimantan in Borneo.
Old-growth forests support biodiversity by providing a complex, stable environment that has remained relatively undisturbed by human activity for centuries. Their structural diversity creates a wide variety of niches that support numerous species.1
Key features that promote this biodiversity include:
- Complex Stand Structure: These forests contain trees of varying ages, sizes, and shapes, which form a multilayered canopy. This vertical complexity provides diverse habitats for different organisms.21
- Deadwood and Debris: The presence of snags (standing dead trees), fallen logs, and woody debris on the forest floor is critical. These elements provide essential habitat and resources for a wide range of fungi, bacteria, insects, and amphibians.21
- Nesting Sites: Older trees often develop cavities, which serve as vital nesting sites for various animals.1
- Canopy Openings: The collapse of old trees creates gaps in the canopy, allowing sunlight to reach the forest floor, which supports the growth of saplings and understory plants.1
- Aquatic Habitats: Streams and lakes within these forests provide specialized environments for fish and other aquatic fauna.1