Abstract
Context
Spatially explicit correlates of foliar elemental, stoichiometric, and phytochemical (ESP) traits represent links to landscape patterns of resource quality.
Objectives
We investigate spatial correlates for multiple foliar ESP traits at the species level and across species at the trait level for five boreal forest understory plants.
Methods
On the island of Newfoundland, Canada, we collected plot-level foliar material from four chronosequenced forest grids. We integrate plot-level response variables of foliar elemental (C, N, P, percent and quantity), stoichiometric (C:N, C:P, N:P), and phytochemical (terpenoids) traits, with spatial predictors available for the whole landscape to test multiple competing hypotheses. These hypotheses include the effects of land cover (e.g., coniferous, deciduous, mixedwood), productivity (e.g., enhanced vegetation index), biotic (e.g., stand age/height, canopy closure) and abiotic (e.g., elevation, aspect, slope) factors.
Results
Spatial correlates of foliar ESP traits were generally species specific. However, at the trait level, some species shared spatial predictors, notably for foliar percent carbon, C:P, N:P, sesquiterpene traits. Here we highlight that foliar C, C:P, and sesquiterpene traits between different species were explained by abiotic spatial correlates alone. Similarly, foliar terpenoid traits between different species were related to a combination of abiotic and biotic factors (mean R2 = 0.26).
Conclusions
Spatial-trait relationships mainly occur at the species level, with some commonalities at the trait level. By linking plot-level foliar ESP traits to spatial predictors, we can map plant chemical composition patterns that influence landscape-scale ecosystem processes and thus inform sustainable landscape management.
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Data availability
The datasets and associated R code used to conduct research presented in this manuscript are available on Figshare.com at https://doi.org/10.6084/m9.figshare.11911455.v1. The Forest Resource Inventory datasets provided by the Provincial Government of Newfoundland and Labrador and the Federal Government of Canada may be made available upon request, however additional permission through these agencies may be required.
Code availability
The R code used to conduct research presented in this manuscript are available on Figshare.com at https://doi.org/10.6084/m9.figshare.11911455.v1.
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Acknowledgements
This research was funded by the Government of Newfoundland and Labrador Centre for Forest Science Innovation (CFSI); Memorial University of Newfoundland SEEDS funding to SJL, EVW, YFW; Mitacs Accelerate Grant to YFW, SJL and EVW; Canada Foundation for Innovation funding to YFW, and the Natural Sciences and Engineering Research Council of Canada (Discovery Grant to YFW). In-kind support was provided by Parks Canada—Terra Nova National Park and the CFSI, with thanks to Janet Feltham and Blair Adams. In addition, we would also like to thank the Landscape Ecology and Spatial Analysis lab at Memorial University of Newfoundland. Thank you to three anonymous reviewers for helpful comments that helped to substantially improve an earlier version of the manuscript.
Funding
This research was funded by the Government of Newfoundland and Labrador Centre for Forest Science and Innovation to YFW (Grant #221273), SJL (Grant #221274), and EVW (Grant #221275), Government of Newfoundland and Labrador Innovate NL Leverage R&D to EVW & SJL (Grant #5404.1884.102) and Ignite R&D to SJL (Grant #5404.1696.101) programs, Mitacs Accelerate Graduate Research Internship program to YW, EVW, & SJL (Grant #IT05904), the Canada Foundation for Innovation John R. Evans Leaders Fund to EVW & SJL (Grant #35973), and a Natural Science and Engineering Research Council Discovery Grant to YFW (Grant #RGPIN-2015-05799).
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TH, SJL, YFW, EVW and MR contributed to the study conception and design. TH and MR collected data and analyses were performed by TH. The manuscript was drafted by TH and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.
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Heckford, T.R., Leroux, S.J., Vander Wal, E. et al. Spatially explicit correlates of plant functional traits inform landscape patterns of resource quality. Landsc Ecol 37, 59–80 (2022). https://doi.org/10.1007/s10980-021-01334-3
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DOI: https://doi.org/10.1007/s10980-021-01334-3