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Comita LS, Jones FA, Manzané-Pinzón EJ, Álvarez-Casino L, Cerón-Souza I, Contreras B, Jaén-Barrios N, Ferro N, Engelbrecht BMJ. Limited intraspecific variation in drought resistance along a pronounced tropical rainfall gradient. Proc Natl Acad Sci U S A 2024; 121:e2316971121. [PMID: 38809703 PMCID: PMC11161779 DOI: 10.1073/pnas.2316971121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 04/08/2024] [Indexed: 05/31/2024] Open
Abstract
Assessing within-species variation in response to drought is crucial for predicting species' responses to climate change and informing restoration and conservation efforts, yet experimental data are lacking for the vast majority of tropical tree species. We assessed intraspecific variation in response to water availability across a strong rainfall gradient for 16 tropical tree species using reciprocal transplant and common garden field experiments, along with measurements of gene flow and key functional traits linked to drought resistance. Although drought resistance varies widely among species in these forests, we found little evidence for within-species variation in drought resistance. For the majority of functional traits measured, we detected no significant intraspecific variation. The few traits that did vary significantly between drier and wetter origins of the same species all showed relationships opposite to expectations based on drought stress. Furthermore, seedlings of the same species originating from drier and wetter sites performed equally well under drought conditions in the common garden experiment and at the driest transplant site. However, contrary to expectation, wetter-origin seedlings survived better than drier-origin seedlings under wetter conditions in both the reciprocal transplant and common garden experiment, potentially due to lower insect herbivory. Our study provides the most comprehensive picture to date of intraspecific variation in tropical tree species' responses to water availability. Our findings suggest that while drought plays an important role in shaping species composition across moist tropical forests, its influence on within-species variation is limited.
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Affiliation(s)
- Liza S. Comita
- The Forest School, Yale School of the Environment, Yale University, New Haven, CT06511
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
| | - F. Andrew Jones
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR
| | - Eric J. Manzané-Pinzón
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
- Departamento de Ciencias Naturales, Facultad de Ciencias y Tecnología, Universidad Tecnológica de Panamá, Panama City, Panamá
| | - Leonor Álvarez-Casino
- Department of Plant Biology and Ecology, Faculty of Biology, University of Seville, Seville, Spain
- Department of Plant Ecology, Center for Ecology and Environmental Research, University of Bayreuth, Bayreuth, Germany
| | - Ivania Cerón-Souza
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR
- Centro de Investigación Tibaitatá, Mosquera Corporación Colombiana de Investigación Agropecuaria (Agrosavia), Cundinamarca250047, Colombia
| | - Blexein Contreras
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
| | - Nelson Jaén-Barrios
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
- Department of Plant Biology, Institute of Biology, University of Campinas, CampinasCEP 13083-970, SP, Brazil
| | - Natalie Ferro
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
| | - Bettina M. J. Engelbrecht
- Smithsonian Tropical Research InstituteApartadoPostal 0843-03092, Panama City, Panamá
- Department of Plant Ecology, Center for Ecology and Environmental Research, University of Bayreuth, Bayreuth, Germany
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Zhao H, Wu J, Wang A, Guan D, Liu Y. Microtopography mediates the climate-growth relationship and growth resilience to drought of Pinus tabulaeformis plantation in the hilly site. FRONTIERS IN PLANT SCIENCE 2022; 13:1060011. [PMID: 36483965 PMCID: PMC9723379 DOI: 10.3389/fpls.2022.1060011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 10/27/2022] [Indexed: 06/17/2023]
Abstract
Understanding the factors affecting the growth of plantation forests can reduce the loss of economic and ecological values caused by plantation forest subhealth. Plantation forests are widely distributed in hilly areas with microtopographic features. Microtopography influences climatic factors associated with plant growth, during not only general time but also extreme events like droughts. However, little research has been conducted on the effects of microtopography on the plantation forest growth. In this paper, we selected Pinus tabulaeformis planted in a hilly site, and studied the effect of microtopography on the climate-growth relationship and drought response of a typical plantation in Northeast China using dendroecological methods. We found: 1) Between hill positions, temperature caused a climatic growth difference. Compared to the hilltop, the correlation of annual growth on the hillside with monthly temperature was more negative in July-August and less positive in January-April. 2) Between aspects, precipitation intensities caused a climatic growth difference. Compared to the sunny slope, the correlation of annual growth on the shady slope with monthly total precipitation below 10 mm/day was less positive (May-June) or more negative (March-April and July), while that with monthly total precipitation above 10 mm/day was more positive in most months.3) Drought response varied significantly based on hill position and aspect. There was no significant difference in resistance between hill positions, while recovery and resilience on the hilltop were greater than those on the hillside.Resistance, recovery, and resilience were all lower on the sunny slope than those on the shady slope. Overall, microtopography exists the effects on the growth of plantation forests, both in terms of climate-growth relationships in general climate and in response to drought when extreme events. Meanwhile, the climatic factors that caused the difference in growth of plantation forests between hill positions and aspects differed. The difference in growth between hill positions was caused by temperature, while that between aspects was caused by precipitation intensity. Drought response difference reflected the legacy effect of drought on plantation growth, which could lead to subsequent changes in climate-growth relationships. These findings demonstrate that strengthening the research of forest trees on microtopography is necessary for accurate carbon sink assessment and precise forest management.
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Affiliation(s)
- Hongming Zhao
- Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
| | - Jiabing Wu
- Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Anzhi Wang
- Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Dexin Guan
- Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Yage Liu
- Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
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O'Brien MJ, Hector A, Kellenberger RT, Maycock CR, Ong R, Philipson CD, Powers JS, Reynolds G, Burslem DFRP. Demographic consequences of heterogeneity in conspecific density dependence among mast-fruiting tropical trees. Proc Biol Sci 2022; 289:20220739. [PMID: 35703055 PMCID: PMC9198787 DOI: 10.1098/rspb.2022.0739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The role of conspecific density dependence (CDD) in the maintenance of species richness is a central focus of tropical forest ecology. However, tests of CDD often ignore the integrated effects of CDD over multiple life stages and their long-term impacts on population demography. We combined a 10-year time series of seed production, seedling recruitment and sapling and tree demography of three dominant Southeast Asian tree species that adopt a mast-fruiting phenology. We used these data to construct individual-based models that examine the effects of CDD on population growth rates (λ) across life-history stages. Recruitment was driven by positive CDD for all species, supporting the predator satiation hypothesis, while negative CDD affected seedling and sapling growth of two species, significantly reducing λ. This negative CDD on juvenile growth overshadowed the positive CDD of recruitment, suggesting the cumulative effects of CDD during seedling and sapling development has greater importance than the positive CDD during infrequent masting events. Overall, CDD varied among positive, neutral and negative effects across life-history stages for all species, suggesting that assessments of CDD on transitions between just two stages (e.g. seeds seedlings or juveniles mature trees) probably misrepresent the importance of CDD on population growth and stability.
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Affiliation(s)
- Michael J. O'Brien
- Área de Biodiversidad y Conservación, Universidad Rey Juan Carlos, Móstoles, Madrid, Spain
| | - Andy Hector
- Department of Plant Sciences, University of Oxford, Oxford, UK
| | | | - Colin R. Maycock
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
| | - Robert Ong
- Forest Research Centre, Sepilok, 90715 Sandakan, Sabah, Malaysia
| | | | - Jennifer S. Powers
- Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN, USA,Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, USA
| | - Glen Reynolds
- Southeast Asia Rainforest Research Partnership (SEARRP), Kota Kinabalu, Sabah, Malaysia
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O'Brien MJ, Escudero A. Topography in tropical forests enhances growth and survival differences within and among species via water availability and biotic interactions. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13977] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Michael J. O'Brien
- Área de Biodiversidad y Conservación Universidad Rey Juan Carlos Móstoles Spain
- Southeast Asia Rainforest Research Partnership (SEARRP) Kota Kinabalu Sabah Malaysia
| | - Adrián Escudero
- Área de Biodiversidad y Conservación Universidad Rey Juan Carlos Móstoles Spain
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