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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The value of climate responses of individual trees to detect areas of climate-change refugia, a tree-ring study in the Brazilian seasonally dry tropical forests

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Godoy-Veiga, Milena [1] ; Cintra, Bruno Barcante Ladvocat [1] ; Strikis, Nicolas Misailidis [2] ; Cruz, Francisco Willian [3] ; Grohmann, Carlos Henrique [4] ; Santos, Matheus Simoes [2] ; Regev, Lior [5] ; Boaretto, Elisabetta [5] ; Ceccantini, Gregorio [1] ; Locosselli, Giuliano Maselli [1, 6]
Total Authors: 10
[1] Univ Sao Paulo, Inst Biosci, Rua Matao 277, BR-05508090 Sao Paulo - Brazil
[2] Fluminense Fed Univ, Geochem Dept, BR-24020141 Niteroi, RJ - Brazil
[3] Univ Sao Paulo, Inst Geosci, Rua Lago 562, BR-05508080 Sao Paulo - Brazil
[4] Univ Sao Paulo, Inst Energy & Environm, Av Prof Luciano Gualberto 1289, BR-05508010 Sao Paulo - Brazil
[5] Weizmann Inst Sci, Sci Archaeol Unit, REAMS Radiocarbon Lab D, IL-7610001 Rehovot - Israel
[6] Inst Bot, Ave Miguel Stefano, BR-04301902 Sao Paulo, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Web of Science Citations: 0

Forests worldwide are facing increasingly frequent climate extremes due to global warming. The negative effects of climate change on tropical forests have been extensively reported by both permanent plots and tree-ring studies that targeted forest?s responses to climate. While they focus mostly on community and population levels, the effects of landscape heterogeneity on trees? sensitivity to climate is often not accounted for, overlooking the diverse responses of individual trees to climate variation. We tested the hypotheses that trees may differ in sensitivity to climate and that some microenvironmental conditions may exert the role of climate-change refugia. We built the first tree-ring chronology of Amburana cearensis trees sampled across a Seasonally Dry Tropical Forest (SDTF) in Brazil. We ensure a robust tree-ring dating using dendrochronological methods and C-14 dating of trees inhabiting various conditions characterized here through the seasonality of the local Normalized Difference Vegetation Index. At the population level, the standard tree-ring chronology suggests that tree growth depends on rainfall and temperature, leading to a common conclusion that drier and warmer conditions would impact interannual tree growth in the tropics. However, the cluster analyses revealed groups of individual trees with distinct growth sensitivities to climate. The most sensitive trees were the individuals located in the highly seasonal vegetation of the epikarst, in contrast to the complacent trees (non-sensitive to regular interannual climate variability) inhabiting the less-seasonal vegetation in the deep soil epikarst and valley. Based on these groups of trees, we built two mean chronologies and assessed their climate-growth relationships. In accordance with the individual analysis, the tree-ring chronology of complacent trees showed no association with wet season precipitation and only moderate association with temperature. The areas supporting these complacent trees of A. cearensis in the less seasonal vegetation correspond to a quarter of the entire sampling site. The climate buffering capacity of these refugia may only be compromised in years of climate extremes when all sampled trees share low growth rates during years with anomalous low rainfall and high temperature. Assessing individual?s climate sensitivity is therefore paramount for a comprehensive understanding of the heterogeneous responses of tropical forests to climate change. The hidden individual tree responses in the population can help identify priority areas of management in a rapidly changing environment. (AU)

FAPESP's process: 19/09813-0 - High-precision radiocarbon dating of dead and fossil tree trunks from the National Park Cavernas do Peruaçu for confirmation of tree-ring annual formation and past climate studies
Grantee:Milena de Godoy Veiga
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 20/09251-0 - Functional forests: biodiversity in the benefit of cities
Grantee:Giuliano Maselli Locosselli
Support Opportunities: Scholarships in Brazil - Young Researchers
FAPESP's process: 19/25636-1 - Spatiotemporal patterns of variability of South American Monsoon System in Tropical South America during the last centuries based on speleothem and tree-ring records
Grantee:Bruno Barcante Ladvocat Cintra
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/07632-6 - Two-centuries of climate changes reconstruction through dendroclimatological and isotopic studies from trees at the Parque Nacional Cavernas do Peruaçu region
Grantee:Milena de Godoy Veiga
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
Grantee:Francisco William da Cruz Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/08783-0 - Functional forests: biodiversity in the benefit of cities
Grantee:Giuliano Maselli Locosselli
Support Opportunities: Research Grants - Young Investigators Grants