Researchers analyzed 422 bird species across 1,410 sites in seven Indonesian islands and found that high species richness does not guarantee ecological health. They measured phylogenetic diversity to assess how distantly related the coexisting birds are, revealing that forest condition depends on these evolutionary distances rather than simple headcounts.
This suggests conservation targets must account for unique lineages that may be highly vulnerable despite a seemingly lush habitat. The study covers specific Indonesian islands, so broader global applicability remains unproven, and the data relies on a specific 2010-2022 timeframe for forest cover changes.
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