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Russo, Sabrina E; McMahon, Sean M; Detto, Matteo; Ledder, Glenn; Wright, S Joseph; Condit, Richard S; Davies, Stuart J; Ashton, Peter S; Bunyavejchewin, Sarayudh; Chang-Yang, Chia-Hao; Ediriweera, Sisira; Ewango, Corneille E N; Fletcher, Christine; Foster, Robin B; Gunatilleke, C V Savi; Gunatilleke, I A U Nimal; Hart, Terese; Hsieh, Chang-Fu; Hubbell, Stephen P; Itoh, Akira; Kassim, Abdul Rahman; Leong, Yao Tze; Lin, Yi Ching; Makana, Jean-Remy; Mohamad, Mohizah Bt; Ong, Perry; Sugiyama, Anna; Sun, I-Fang; Tan, Sylvester; Thompson, Jill; Yamakura, Takuo; Yap, Sandra L; Zimmerman, Jess K
Nature ecology & evolution, 02/2021, Volume: 5, Issue: 2Journal Article
Resource allocation within trees is a zero-sum game. Unavoidable trade-offs dictate that allocation to growth-promoting functions curtails other functions, generating a gradient of investment in growth versus survival along which tree species align, known as the interspecific growth-mortality trade-off. This paradigm is widely accepted but not well established. Using demographic data for 1,111 tree species across ten tropical forests, we tested the generality of the growth-mortality trade-off and evaluated its underlying drivers using two species-specific parameters describing resource allocation strategies: tolerance of resource limitation and responsiveness of allocation to resource access. Globally, a canonical growth-mortality trade-off emerged, but the trade-off was strongly observed only in less disturbance-prone forests, which contained diverse resource allocation strategies. Only half of disturbance-prone forests, which lacked tolerant species, exhibited the trade-off. Supported by a theoretical model, our findings raise questions about whether the growth-mortality trade-off is a universally applicable organizing framework for understanding tropical forest community structure.
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