Partitioning mortality into growth-dependent and growth-independent hazards across 203 tropical tree species

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Abstract
Significance: We present a model that partitions rates of tropical tree mortality into growth-dependent and growth-independent hazards. This creates the opportunity to examine the relative contributions of within-species and across-species variation on tropical tree mortality rates, but also how species traits affect each hazard. We parameterize this model using >400,000 observed survival records collected over a 15-y period at Barro Colorado Island, Panama from more than 180,000 individuals across 203 species. We show that marginal carbon budgets are a major contributor to tree death on Barro Colorado Island. Moreover, we found that while species’ light demand, maximum diameter at breast height (dbh), and wood density affected tree mortality in different ways, they explained only a small fraction of the total variability observed among species.
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Funding Information
  • Science and Industry Endowment Fund (RP04-174)
  • Australian Research Council (FT160100113)
  • Australian Research Council (FL100100080)

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