Chemical Similarity of Co-occurring Trees Decreases With Precipitation and Temperature in North American Forests

Sedio, Brian E. and Spasojevic, Marko J. and Myers, Jonathan A. and Wright, S. Joseph and Person, Maria D. and Chandrasekaran, Hamssika and Dwenger, Jack H. and Prechi, María Laura and López, Christian A. and Allen, David N. and Anderson-Teixeira, Kristina J. and Baltzer, Jennifer L. and Bourg, Norman A. and Castillo, Buck T. and Day, Nicola J. and Dewald-Wang, Emily and Dick, Christopher W. and James, Timothy Y. and Kueneman, Jordan G. and LaManna, Joseph and Lutz, James A. and McGregor, Ian R. and McMahon, Sean M. and Parker, Geoffrey G. and Parker, John D. and Vandermeer, John H. (2021) Chemical Similarity of Co-occurring Trees Decreases With Precipitation and Temperature in North American Forests. Frontiers in Ecology and Evolution, 9. ISSN 2296-701X

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Abstract

Plant diversity varies immensely over large-scale gradients in temperature, precipitation, and seasonality at global and regional scales. This relationship may be driven in part by climatic variation in the relative importance of abiotic and biotic interactions to the diversity and composition of plant communities. In particular, biotic interactions may become stronger and more host specific with increasing precipitation and temperature, resulting in greater plant species richness in wetter and warmer environments. This hypothesis predicts that the many defensive compounds found in plants’ metabolomes should increase in richness and decrease in interspecific similarity with precipitation, temperature, and plant diversity. To test this prediction, we compared patterns of chemical and morphological trait diversity of 140 woody plant species among seven temperate forests in North America representing 16.2°C variation in mean annual temperature (MAT), 2,115 mm variation in mean annual precipitation (MAP), and from 10 to 68 co-occurring species. We used untargeted metabolomics methods based on data generated with liquid chromatography-tandem mass spectrometry to identify, classify, and compare 13,480 unique foliar metabolites and to quantify the metabolomic similarity of species in each community with respect to the whole metabolome and each of five broad classes of metabolites. In addition, we compiled morphological trait data from existing databases and field surveys for three commonly measured traits (specific leaf area [SLA], wood density, and seed mass) for comparison with foliar metabolomes. We found that chemical defense strategies and growth and allocation strategies reflected by these traits largely represented orthogonal axes of variation. In addition, functional dispersion of SLA increased with MAP, whereas functional richness of wood density and seed mass increased with MAT. In contrast, chemical similarity of co-occurring species decreased with both MAT and MAP, and metabolite richness increased with MAT. Variation in metabolite richness among communities was positively correlated with species richness, but variation in mean chemical similarity was not. Our results are consistent with the hypothesis that plant metabolomes play a more important role in community assembly in wetter and warmer climates, even at temperate latitudes, and suggest that metabolomic traits can provide unique insight to studies of trait-based community assembly.

Item Type: Article
Subjects: STM Open Academic > Multidisciplinary
Depositing User: Unnamed user with email admin@eprint.stmopenacademic.com
Date Deposited: 10 Jul 2023 06:22
Last Modified: 03 Nov 2023 04:48
URI: http://publish.sub7journal.com/id/eprint/869

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