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Responses to spring rainfall and shading in moonworts: trait variability and the dynamics of a genus community

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Abstract

In the context of ongoing global changes, long-term demographic monitoring data is crucial to assess the viability of natural populations. Such data is particularly important when large fluctuations in population size obfuscate background demographic trajectories. Here, we report results from the first 5 years of a long-term monitoring of a moonwort (Botrychium, Ophioglossaceae) community in Bic National Park, eastern Canada. Our objectives were to provide a first estimate of the composition, size, and demography of the moonwort colonies and to evaluate the putative influence of meteorological and microenvironmental variables on the density of aboveground sporophytes and sporophyte trait variability. Individuals were identified to the species level and tallied in each colony (n = 16 colonies) for the first 3 years (2019–2021) and then marked, monitored, and measured in permanent sample plots (n = 27 plots) for the last 3 years (2021–2023). Although colonies did not vary in composition (n = 8 Botrychium species), the number of emerged individuals differed yearly. Moonwort abundance, re-emergence, and trophophore height were associated with rainfall during the period of sporophyte emergence. Post-drought recovery occurred readily, which might reflect rapid recruitment or dormancy in Botrychium. Moonwort abundance declined as shrub cover and herbaceous vegetation height increased whereas trophophore size was smaller under closed tree canopy. Our results suggest spring rainfall as the limiting factor in opened habitats, whereas competition for sunlight may be limiting under closed canopy. The sizable and species-rich moonwort community of the Bic National Park provides key insights into Botrychium ecology and community dynamics.

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Data availability

Data available are available in the figshare repository at https://doi.org/https://doi.org/10.6084/m9.figshare.25123019 (Harimanana et al. 2024).

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Acknowledgements

We thank A. Atikessé, M. Couture, V. Laflamme, S. Larose, L. Pothier-Guerra, R. Turquin, M. Deslauriers. E. Pelletier, R. Claudepierre, S. Ahmad, J. Cigana, E. Cliché, L. Dumont, F. Bordeleau, A. Langlois, J. Fisette, L. Nondier, G. Rincon Pinilla, D. Ruffio, and G. Demeule for their help with data collection in the field over the last 5 years. We are grateful to Mélanie Sabourin (Société des établissements de plein air du Québec) for initiating and maintaining the monitoring of the moonwort community in Bic National Park.

Funding

This work was supported by Natural Sciences and Engineering Research Council of Canada (Undergraduate Student Research Awards to SH and CDM; Discovery Grant program RGPIN-2018-06586 to GdL), the Canada Research Chairs Program (Canada Research Chair in Integrative Biology of the Northern Flora CRC-2017-00112; CRC-2022-00518 to GdL). GdL has received research support from the Société des établissements de plein air du Québec. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analyses were performed by SH and CDM with the help of GdL. The first draft of the manuscript was written by SH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Guillaume de Lafontaine.

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Competing interests

GdL has received research funding from the Société des établissements de plein air du Québec, a state-owned enterprise that manages Québec’s parks and wildlife reserves.

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Communicated by Peter le Roux.

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Harimanana, S., Ducharme Martin, C. & de Lafontaine, G. Responses to spring rainfall and shading in moonworts: trait variability and the dynamics of a genus community. Plant Ecol (2024). https://doi.org/10.1007/s11258-024-01428-3

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  • DOI: https://doi.org/10.1007/s11258-024-01428-3

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