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Article Dans Une Revue New Phytologist Année : 2023

Global seed dormancy patterns are driven by macroclimate but not fire regime

Sergey Rosbakh
Angelino Carta
Eduardo Fernández-Pascual
Shyam Phartyal
Efisio Mattana
Filip Vandelook
Jerry Baskin
  • Fonction : Auteur
Carol Baskin

Résumé

Summary Seed dormancy maximizes plant recruitment in habitats with variation in environmental suitability for seedling establishment. Yet, we still lack a comprehensive synthesis of the macroecological drivers of nondormancy and the different classes of seed dormancy: physiological dormancy, morphophysiological dormancy and physical dormancy. We examined current geographic patterns and environmental correlates of global seed dormancy variation. Combining the most updated data set on seed dormancy classes for > 10 000 species with > 4 million georeferenced species occurrences covering all of the world's biomes, we test how this distribution is driven by climate and fire regime. Seed dormancy is prevalent in seasonally cold and dry climates. Physiological dormancy occurs in relatively dry climates with high temperature seasonality (e.g. temperate grasslands). Morphophysiological dormancy is more common in forest‐dominated, cold biomes with comparatively high and evenly distributed precipitation. Physical dormancy is associated with dry climates with strong seasonal temperature and precipitation fluctuations (e.g. deserts and savannas). Nondormancy is associated with stable, warm and wetter climates (e.g. tropical rain forest). Pyroclimate had no significant effect on the distribution of seed dormancy. The environmental drivers considered in this study had a comparatively low predictive power, suggesting that macroclimate is just one of several global drivers of seed dormancy.

Dates et versions

hal-04447703 , version 1 (08-02-2024)

Identifiants

Citer

Sergey Rosbakh, Angelino Carta, Eduardo Fernández-Pascual, Shyam Phartyal, Roberta Dayrell, et al.. Global seed dormancy patterns are driven by macroclimate but not fire regime. New Phytologist, 2023, 240 (2), pp.555-564. ⟨10.1111/nph.19173⟩. ⟨hal-04447703⟩
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