Invasive Conifer Dynamics in Forest Ecosystems

Invasive conifers, predominantly species within the Pinaceae, have altered forest ecosystems across temperate and boreal regions, as well as in many parts of the Southern Hemisphere. Through prolific seed production, long‐distance dispersal and associations with ectomycorrhizal fungi, these trees establish beyond plantation boundaries to form dense monospecific stands. Such invasions modify canopy structure, light regimes and soil properties, often reducing native plant diversity and altering nutrient cycling. Fire regimes may be shifted by increased fuel loads, further reinforcing conifer dominance. Climate change is projected to expand the suitable range for many invasive conifers, increasing overlap with vulnerable native forests. Management approaches encompass prevention, early detection, risk mapping with species distribution models, targeted removal and post‐removal restoration, yet success is constrained by persistent soil legacies and seed banks. Effective control demands integrated strategies that combine ecological understanding of invasibility with adaptive management under changing climatic conditions.

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Invasive Conifer Dynamics in Forest Ecosystems publication trend

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Technical terms

Species distribution models (SDMs): Computational tools that relate known occurrences of a species to environmental variables to predict habitat suitability and potential range shifts.

Ectomycorrhizal association: A symbiotic relationship between certain fungi and tree roots that enhances nutrient uptake and can facilitate invasive tree establishment.

Invasibility: The susceptibility of an ecosystem to colonisation and spread by non‐native species, determined by factors such as disturbance, resource availability and climatic conditions.

Microenvironmental conditions: Localised environmental factors, including soil moisture, temperature and light availability, which influence seed germination, seedling growth and species interactions.

Fire regime: The pattern, frequency and intensity of fires in an ecosystem, which can be altered by changes in vegetation composition and fuel loads.

References

1. Belowground legacies of Pinus contorta invasion and removal result in multiple mechanisms of invasional meltdown. AoB Plants (2014).
2. Pinus contorta Alters Microenvironmental Conditions and Reduces Plant Diversity in Patagonian Ecosystems. Diversity (2023).
3. Range reshuffling: Climate change, invasive species, and the case of Nothofagus forests in Aotearoa New Zealand. Diversity and Distributions (2023).
4. The right tree in the right place? A major economic tree species poses major ecological threats. Biological Invasions (2022).