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The First Network of Tree-Ring Chronologies for Co-Occurring Nothofagus nervosa and Nothofagus obliqua Along a Precipitation Gradient in Patagonia, Argentina
by Bonada, A., Amoroso, M. & Gedalof, Z.
Published by Tree-Ring Research
December 7, 2021
We present the first network of tree-ring chronologies for co-occurring Nothofagus nervosa and Nothofagus obliqua in Argentina. Using standard dendrochronological techniques, we developed seven tree-ring width chronologies for each species, encompassing their E-W distribution along a precipitation gradient. Chronology statistics indicated that N. nervosa and N. obliqua are strong candidates for research in dendrochronology. The chronologies were used to study and compare the temporal and spatial growth patterns of each species. Correlation and principal components analysis of the tree-ring chronologies serve as evidence of a strong common signal, indicating shared regional growth patterns across the gradient with some exceptions between sites and species. These results indicate the high potential of N. nervosa and N. obliqua for their use in dendroclimatology.
Effects of climate on the radial growth of mixed stands of Nothofagus nervosa and Nothofagus obliqua along a precipitation gradient in Patagonia, Argentina
by Bonada, A, Amoroso, M., Gedalof, Z., Srur, A. & Gallo, L.
Published by Dendrochronologia
August 4, 2022
Climate models for North Patagonia in Argentina project dryer conditions, due to a decrease in mean precipitation combined with an increase in mean temperatures. The temperate mixed Nothofagus forest, which exists along a steep precipitation gradient, could be directly impacted. For this study, we evaluated the influence of mean climate on the growth of the significant deciduous species: N. nervosa and N. obliqua. For the first time in Argentina, dendroclimatological analyses were done on both species using a network of 14 chronologies, covering their longitudinal distribution along a gradient of declining precipitation from west to east. Seasonal correlation analysis revealed that temperature has a negative effect on the growth of both species across all sites, particularly during summer of the previous and current growth season. Precipitation has a positive effect on the growth of trees for both species, which is more significant for N. nervosa. The relationship between early-summer climate and growth remained relatively stable over time for N. nervosa; however, for N. obliqua the detrimental effects of temperature increased towards the end of the 20th century, and the positive effects of precipitation decreased, particularly at the driest end of the gradient. These results suggest that a continued decrease in rainfall with a rise in temperature could impact growth for both of these species.
Biography
Dr. Anabela Bonada is a distinguished expert in climate adaptation at the Intact Centre on Climate Adaptation, University of Waterloo. Bonada spearheads critical research initiatives, notably contributing to the development of a national wildfire guide, the creation of impactful infographics, and the formulation of recommendations to scale up nature-based solutions. Her work aims at mitigating risks associated with wildfire, extreme heat, and flooding at various levels, from individual homes to landscapes. Bonada brings a wealth of expertise grounded in a strong academic foundation. Holding a Ph.D. in Geography from the University of Guelph, her research delved into the impact of climate change on tree growth, providing valuable insights into the repercussions of extreme events, like drought, on forest ecosystems. Additionally, she earned a B.Sc. in Environmental Science from the University of Waterloo and holds a Diploma in Ecosystem Management from Fleming College. Her expertise has garnered recognition, making her a sought-after subject matter expert on climate adaptation measures. Bonada has been featured in prominent media outlets such as CTV News, CBC, The Globe and Mail, and more. Her insights provide a crucial perspective on the challenges and solutions in the ever-evolving landscape of climate adaptation.