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Regional and temporal patterns of natural recruitment in a California endemic oak and a possible ‘research reserve effect’

The perceived absence of young cohorts in many long‐lived trees, particularly Quercus species, has raised concerns about their long‐term viability. While there is a robust body of literature on valley oak (Quercus lobata) planting experiments, conducted mainly on research reserves, an assessment of natural recruitment across a range of climate and land use types has been lacking. At a regional scale over time, we explored patterns of natural recruitment in this endemic California oak reported to be experiencing persistent recruitment failure.