Is there tree senescence? The fecundity evidence



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Qiu, Tong and Aravena, Marie-Claire and Andrus, Robert and Ascoli, Davide and Bergeron, Yves and Berretti, Roberta and Bogdziewicz, Michal and Boivin, Thomas and Bonal Andrés, Raúl and Caignard, Thomas and Calama, Rafael and Camarero, J. Julio and Clark, Connie J. and Courbaud, Benoit and Delzon, Sylvain and Donoso Calderon, Sergio and Farfan-Rios, William and Gehring, Catherine A. and Gilbert, Gregory S and Greenberg, Cathryn H. and Guo, Qinfeng and Hille Ris Lambers, Janneke and Hoshizaki, Kazuhiko and Ibanez, Ines and Journé, Valentin and Kilner, Christopher L. and Kobe, Richard K. and Kunstler, Georges and LaMontagne, Jalene M. and Ledwon, Mateusz and Lutz, James A. and Motta, Renzo and Myers, Jonathan A. and Nagel, Thomas A. and Nunez, Chase L. and Pearse, Ian S. and Piechnik, Łukasz and Poulsen, John R. and Poulton-Kamakura, Renata and Redmond, Miranda D. and Reid, Chantal D. and Rodman, Kyle C. and Scherer, C. Lane and Schmidt Van Marle, Harald and Seget, Barbara and Sharma, Shubhi and Silman, Miles and Swenson, Jennifer J. and Swift, Margaret and Uriarte, Maria and Vacchiano, Giorgio and Veblen, Thomas T. and Whipple, Amy V. and Whitham, Thomas G. and Wion, Andreas P. and Wright, S. Joseph and Zhu, Kai and Zimmerman, Jess K. and Zywiec, Magdalena and Clark, James S. (2021) Is there tree senescence? The fecundity evidence. Proceedings of the National Academy of Sciences, 118 (34). pp. 1-10. ISSN 0027-8424 Electronic: 1091-6490

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Despite its importance for forest regeneration, food webs, and human economies, changes in tree fecundity with tree size and age remain largely unknown. The allometric increase with tree diameter assumed in ecological models would substantially overestimate seed contributions from large trees if fecundity eventually declines with size. Current estimates are dominated by overrepresentation of small trees in regression models. We combined global fecundity data, including a substantial representation of large trees. We compared size–fecundity relationships against traditional allometric scaling with diameter and two models based on crown architecture. All allometric models fail to describe the declining rate of increase in fecundity with diameter found for 80% of 597 species in our analysis. The strong evidence of declining fecundity, beyond what can be explained by crown architectural change, is consistent with physiological decline. A downward revision of projected fecundity of large trees can improve the next generation of forest dynamic models.

Item Type:Article
Uncontrolled Keywords:Tree fecundity; Tree senescence; Tree life history; Allometric scaling crown architecture
Subjects:Medical sciences > Biology > Botany
Medical sciences > Biology > Ecology
ID Code:71855
Deposited On:22 Apr 2022 10:28
Last Modified:23 Sep 2022 07:59

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