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Species, hybrid and genotype effects on leaf litter curling, and their extended consequences for spiders and soil moisture dynamics

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Abstract

Background and aims

Subtle morphological traits, such as leaf litter curling, may have unexpected legacy effects on ecosystems. We tested the hypotheses that litter curling is influenced by plant species, hybridization and genotype, and has extended consequences for associated organisms and soil processes.

Methods

A novel litter curling index (LCI) was used to characterize the curling of leaf litter from 11 plant species (including shrubs, trees and a forb) in natural field sites and of two Populus species (P. fremontii James, P. angustifolia S. Watson), their F1 hybrids and replicated P. angustifolia genotypes from a common garden. Surveys of dominant, litter-dwelling spiders (Agelenidae), and a soil drying experiment, were used to test the potential extended ecological consequences of litter curling.

Results

Five results emerged. (1) LCI ranged 15-fold among plant species in natural sites. (2) LCI nearly doubled from P. fremontii to P. angustifolia, while average LCI for F1 hybrids was intermediate (although not statistically different from P. fremontii). (3) LCI exhibited broad-sense heritability (H2 = 0.42) among P. angustifolia genotypes. (4) Abundance of spider webs was positively associated with increasing litter curl across the Populus hybrid system (R2 = 0.35). (5) After 57 days of drying, flat litter contained 1.4 times higher moisture than curled litter, which translated to wetter soil beneath flat litter.

Conclusion

Litter curling has a genetic basis, which has legacy effects on other trophic levels and soil moisture dynamics that may shape the ecology and evolution of complex communities.

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Data availability

Data generated for this study are available in the Dryad Digital Repository at doi:https://doi.org/10.5061/dryad.2jm63xsth.

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Acknowledgements

We thank the Ogden Nature Center for field housing and a site for the common garden, and we thank M. Bowker, M. Lau, P. Patterson, B. Harrop, C. Brocious, the Gehring Lab and the Cottonwood Ecology Group for input and technical assistance. D.A. Frank and three anonymous reviewers provided valuable feedback on the manuscript.

Funding

Research was supported by the following National Science Foundation funding: a Frontiers in Integrative Biological Research grant (DEB-0425908), MRI support for the Southwest Experimental Garden Array (DBI-1126840), and Integrative Graduate Education and Research Traineeships to L. J. Lamit and Z. G. Compson. Additional support was provided by Achievement Rewards for College Scientists scholarships.

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Contributions

TW and ZC envisioned the study and developed methods. TW, ZC and LJL conducted the fieldwork and/or data collection. LJL analyzed the data. TGW established the common garden. TGW, CAG and LJL provided input into experimental design and interpretation of results. TW, LJL and TGW wrote the manuscript with significant input from other authors.

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Correspondence to Louis J. Lamit.

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Responsible Editor: Alfonso Escudero.

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Todd Wojtowicz and Louis J. Lamit contributed equally as co-first authors on this research.

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Wojtowicz, T., Lamit, L.J., Compson, Z.G. et al. Species, hybrid and genotype effects on leaf litter curling, and their extended consequences for spiders and soil moisture dynamics. Plant Soil 492, 641–653 (2023). https://doi.org/10.1007/s11104-023-06206-0

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