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Fast height growth is key to non-native conifers invasiveness in temperate forests

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A Correction to this article was published on 18 May 2024

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Abstract

Many exotic conifer species have been introduced for wood production in temperate regions. Some of these species can display an invasive behavior and negatively impact native ecosystems. It is therefore crucial to identify potentially invasive species before they are widely planted. Seedling high relative growth rate (RGR) and specific leaf area (SLA) have been associated with enhanced invasiveness of trees in previous studies. However, it has been mainly demonstrated for light-demanding species in disturbed habitats, less for shade-tolerant species in closed forests. Here, we investigated the link between seedlings growth traits of 15 exotic conifer species and invasiveness considered at both global and local scale. Seedlings were grown outdoor, under a shade net, and harvested after 4 and 10 weeks. RGR, SLA, Shoot–Root ratio, shoot relative growth rate, relative height growth rate (RHGR) and relative needles production rate were measured. We developed a continuous approach to position each species along a gradient of invasiveness. Local invasiveness consists of a value based on regeneration densities and dispersal distances observed in forest arboreta in Southern Belgium, and is therefore related to the ability of species to invade closed forest ecosystems. Global invasiveness was calculated based on the GBIF Database and the Global Compendium of Weeds, and encompasses all potentially invaded habitats. It appeared that RHGR was positively related to both local and global invasiveness, while SLA was positively related to local invasiveness only. However, RGR was not significantly related with local nor global invasiveness. This study indicates that preferential investment in rapid vertical growth associated with fast resource acquisition is a strategy enhancing invasiveness of non-native conifers, also in closed, shaded temperate forests.

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Data availability

The datasets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We would like to thank Manon Rousseau for her assistance in the data collection as part of her internship.

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The authors declare that no funds, grants or other supports were received during the preparation of this manuscript.

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All authors contributed to the study conception. Material preparation, data collection, analyses and redaction of the drafts were performed by Aurore Fanal. All authors read, modified and commented previous versions of the manuscript. All authors approved the final manuscript.

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Correspondence to Aurore Fanal.

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The original online version of this article was revised: In the original version of this article, the given and family names of Fanal Aurore, Porté Annabel, Mahy Grégory and Monty Arnaud were incorrectly structured. It should written as Given name: Aurore Family name: Fanal. Given name: Annabel Family name: Porté. Given name: Grégory Family name: Mahy Given name: Arnaud Family name: Monty.

Appendix

Appendix

See Fig. 6 and Tables 5 and 6.

Fig. 6
figure 6

Boxplots of traits for each conifer species. Colors correspond to the phylogenetic group. Units are g g−1 d−1 for RGR and SRGR, cm cm−1 d−1 for RHGR, needles.needles−1 d−1 for RNPR and cm2 g−1 for SLA

Table 5 Regression summary of the two models selected by stepwise regression on growth traits without accounting for the taxonomic group
Table 6 Z scores, global and local invasiveness for the 15 studied species

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Fanal, A., Porté, A., Mahy, G. et al. Fast height growth is key to non-native conifers invasiveness in temperate forests. Biol Invasions 26, 857–874 (2024). https://doi.org/10.1007/s10530-023-03214-0

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  • DOI: https://doi.org/10.1007/s10530-023-03214-0

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