Seed rain reveals health of Brazil’s fragmented Atlantic Forest
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Researchers in Brazil studied seed dispersal, known as “seed rain”, across 52 forest fragments of the Atlantic Forest, a biome covering a large area of eastern Brazil and home to over half of the country’s population.
The Atlantic Forest has lost much of its original coverage, with only 23% of its initial area remaining as forest. Scientists wanted to understand how the remaining forest fragments support seed dispersal and future forest regeneration.
The team compiled data from previous studies, analyzing over 1.3 million seeds collected using fine mesh nets placed throughout the forest. They discovered that forest cover, combined with rainfall, is the most important factor in maintaining seed diversity in fragmented areas. Areas surrounded by other conserved forest patches showed better seed diversity despite being fragmented. Proximity to preserved forest allows larger animals to move between fragments, increasing seed dispersal.
However, highly fragmented and isolated areas often receive mostly small seeds carried by wind or birds, which tend to come from fast-growing, less diverse plant species. Larger seeds, dispersed by animals like toucans and jacus (a type of bird), are crucial for establishing the slower-growing, carbon-storing trees that create a more robust forest.
