Abstract
The resilience of an ecological unit encompasses resistance during adverse conditions and the capacity to recover. We adopted a ‘resistance-recovery’ framework to experimentally partition the resilience of a foundation species (the seagrass Cymodocea nodosa). The shoot abundances of nine seagrass meadows were followed before, during and after simulated light reduction conditions. We determined the significance of ecological, environmental and genetic drivers on seagrass resistance (% of shoots retained during the light deprivation treatments) and recovery (duration from the end of the perturbed state back to initial conditions). To identify whether seagrass recovery was linearly related to prior resistance, we then established the connection between trajectories of resistance and recovery. Finally, we assessed whether recovery patterns were affected by biological drivers (production of sexual products—seeds—and asexual propagation) at the meadow-scale. Resistance to shading significantly increased with the genetic diversity of the meadow and seagrass recovery was conditioned by initial resistance during shading. A threshold in resistance (here, at a ca. 70% of shoot abundances retained during the light deprivation treatments) denoted a critical point that considerably delays seagrass recovery if overpassed. Seed densities, but not rhizome elongation rates, were higher in meadows that exhibited large resistance and quick recovery, which correlated positively with meadow genetic diversity. Our results highlight the critical role of resistance to a disturbance for persistence of a marine foundation species. Estimation of critical trade-offs between seagrass resistance and recovery is a promising field of research to better manage impacts on seagrass meadows.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We acknowledge Paula Bonet, Nestor Bosch, Luis M. Ferrero-Vicente, Andrea García, Tony Sánchez, and José L. Sánchez-Lizaso for their help during fieldwork.
Funding
This work was funded by a project (RESIGRASS, CGL2014-58829) supported by the Secretaría de Estado de Investigación, Desarrollo e Innovación (MINECO, Government of Spain).
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F Tuya, F Tomas, YFT and JT conceived the ideas and designed the experiments. F Tuya, YFT, YPR, FE, PM, LC, FOT, JADO, LR, LA, IC, JMC, AMR, GP, CM, JT and F Tomas performed the experiments. F Tuya analysed the data. F Tuya wrote the manuscript; other authors provided editorial advice.
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Communicated by James Fourqurean.
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Tuya, F., Fernández-Torquemada, Y., del Pilar-Ruso, Y. et al. Partitioning resilience of a marine foundation species into resistance and recovery trajectories. Oecologia 196, 515–527 (2021). https://doi.org/10.1007/s00442-021-04945-4
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DOI: https://doi.org/10.1007/s00442-021-04945-4