New study reveals 'onion-like' pattern in global biodiversity organization
A new study published in Nature Ecology & Evolution reveals a universal "onion-like" pattern in how biodiversity is organized globally, with dense, unique biodiversity at the center and grading outward to porous, mixed margins. Researchers analyzed over 30,000 species across various taxa, tiling the earth into cells and using network analysis to group co-occurring species into seven biogeographical sectors. These sectors appear repeatedly within major regions and taxonomic groups. The study found that temperature and rainfall models could predict sector belonging, implying environmental filters determine species survival. This understanding can guide conservation efforts by identifying key habitats and corridors, moving beyond traditional protected areas.
Key Points
- A study found a universal 'onion-like' pattern in global biodiversity organization, with unique species at the core and mixed margins.
- Researchers analyzed over 30,000 species across various taxa, using network analysis to identify seven recurring biogeographical sectors.
- Environmental factors like temperature and rainfall were found to predict which sector a cell belonged to, indicating their role as filters.
- The outer layers contained fewer specialist species, often subsets of inner layer species, rather than entirely different ones.
- This new understanding can help conservationists make smarter decisions about protecting key habitats and corridors.
Exam Facts
- Study published in Nature Ecology & Evolution.
- Researchers studied over 30,000 species (birds, mammals, amphibians, reptiles, rays, dragonflies, trees).
- Global databases used: IUCN Red List, BirdLife International, US Forest inventories.
- Earth tiled into cells of approximately 111 sq. km.
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