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Large tree mortality leads to major aboveground biomass decline in a tropical forest reserve

  • Conservation ecology – original research
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Abstract

Humans are transforming the ecology of the Earth through rapid changes in land use and climate. These changes can affect tropical forest structure, dynamics and diversity. While numerous studies have focused on diversity metrics, other aspects of forest function, such as long-term biomass dynamics, are often less considered. We evaluated plant community structure change (i.e., abundance, diversity, composition, and aboveground biomass) in a 2.25 ha forest dynamics plot located within a ~ 365 ha reserve in southern Costa Rica. We censused, mapped and identified to species all plants ≥ 5 cm diameter at breast height (DBH) in three surveys spanning 2010–2020. While there were no changes in late-successional species diversity, there were marked changes in overall species composition and biomass. Abundance of large (≥ 40 cm DBH) old-growth dense-wooded trees (e.g., Lauraceae, Rosaceae) decreased dramatically (27%), leading to major biomass decline over time, possibly driven by recent and recurrent drought events. Gaps created by large trees were colonized by early-successional species, but these recruits did not make up for the biomass lost. Finally, stem abundance increased by 20%, driven by increasing dominance of Hampea appendiculata. While results suggest this reserve may effectively conserve overall plant diversity, this may mask other key shifts such as large aboveground biomass loss. If this pattern is pervasive across tropical forest reserves, it could hamper efforts to preserve forest structure and ecosystem services (e.g., carbon storage). Monitoring programs could better assess carbon trends in reserves over time simply by tracking large tree dynamics.

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Acknowledgements

We thank the Las Cruces Biological Station (Organization for Tropical Studies) for logistical support and access to the forest dynamics plot. We thank Juan Abel Rosales, Chris Graham, Javier Fernández, Víctor Meza, and many volunteers for their assistance in establishing the plot and conducting surveys.

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No funding was received for conducting this study.

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Authors

Contributions

RAZ, FOB, and CJP contributed to the study conception and design. All authors performed data collection. FOB made taxonomic identification. MSJ and LW made data analyses. The first draft of the manuscript was written by MSJ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Miriam San-José.

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The authors have no conflicts of interest to declare that are relevant to the content of this article.

Additional information

Communicated by Marie-Josée Fortin.

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Supplementary file1 (DOCX 12468 KB)

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San-José, M., Werden, L., Peterson, C.J. et al. Large tree mortality leads to major aboveground biomass decline in a tropical forest reserve. Oecologia 197, 795–806 (2021). https://doi.org/10.1007/s00442-021-05048-w

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  • DOI: https://doi.org/10.1007/s00442-021-05048-w

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