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Soil temperature drives elevational patterns of reproductive allometry in a biodiversity hotspot

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Abstract

Understanding the geographic patterns of reproductive allocation helps in clarifying the selective forces that shape the reproductive strategies of plants. However, studies on the elevational patterns of reproductive allocation remain limited. Moreover, although soil attributes have long been suspected to drive elevational patterns of reproductive allocation, few studies have explored this relationship. Delaying reproduction and allocating a high proportion of biomass to vegetative organs may be risky for plants living under high-elevation habitats, as these two processes can potentially lead to plant reproductive failure due to the low temperatures and short growing seasons at high elevations. Thus, we hypothesize that reproductive effort will increase with elevation and the elevational pattern of reproductive allocation will be largely driven by soil attributes, given their covariation with elevation. To test these hypotheses, we determined the vegetative and reproductive biomass of individual Impatiens arguta (Balsaminaceae) plants across 12 populations in the Gaoligong Mountains (China), and collected data on soil temperature, nutrients, moisture, and pH for each population. Based on standard major axis regression and linear regression models, we found that (1) both vegetative and reproductive biomass decreased with elevation; (2) all populations demonstrated significant allometric slopes (i.e., linear coefficients of log[reproductive biomass] − log[vegetative biomass] regressions) > 1; (3) allometric slopes decreased with elevation; and (4) soil temperature was a better predictor of the allometric slope than elevation, i.e., the allometric slope decreased with soil temperature. These results suggest that plant species growing at high elevation invest proportionately more resources to reproduction as an adaptation to low-temperature environments, and reproductive output is heavily dependent on vegetative growth. This study provides the first evidence of soil temperature driving reproductive allocation patterns, which suggests that plant species will favor allocation to growth under increasing soil temperatures with climate warming.

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Supporting data will be uploaded to the Dryad Digital Repository upon acceptance.

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Acknowledgements

We are grateful to Lian-Tao Yang, Ding-Hua Kang, and Su-Ru Lin for assistance in field work. We also thank two anonymous reviewers for their valuable comments and suggestions on this manuscript. This work was supported by the Science Foundation of Baoshan University (BYBS201803) and Science and Technology Department of Yunnan Province of China (2017FH001-126).

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Authors and Affiliations

  1. Key Laboratory of Insect Resources Conservation and Utilization in Western Yunnan, Baoshan University, Baoshan, 678000, Yunnan, China

    Kai Chen, Qing Liu & Zi-Hong Chen

  2. School of Resources and the Environment, Baoshan University, Baoshan, 678000, Yunnan, China

    Kai Chen, Zi-Hong Chen & Zu-Lei Li

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  1. Kai Chen
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  2. Qing Liu
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  3. Zi-Hong Chen
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  4. Zu-Lei Li
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Contributions

KC designed the study, generated the graphs, conducted statistical analysis, and wrote the manuscript. QL and Z-HC designed the study, collected the data, and revised the manuscript. Z-LL collected the data.

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Correspondence to Kai Chen.

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Field sampling was permitted by the National Nature Reserve of Gaoligong Mountains. The plant species collected in this study is not included in the Inventory of Rare and Endangered Plants of China.

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Communicated by Jesse Kalwij.

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Chen, K., Liu, Q., Chen, ZH. et al. Soil temperature drives elevational patterns of reproductive allometry in a biodiversity hotspot. Plant Ecol 221, 979–988 (2020). https://doi.org/10.1007/s11258-020-01055-8

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