Masting Breakdown in European Beech Reduces Fitness Benefits of Masting, Partly Explained by Climate Change.
Jantzen CC, Burant JB, Gamelon M, Bakker ES, Visser ME
Climate Adaptation
Beech trees dropping a carpet of nuts every few years is what keeps squirrels, jays, and deer from eating every single seed — and that same unpredictability is quietly unraveling in forests across Europe and beyond.
Beech trees normally have spectacular seed years — dropping huge quantities of nuts all at once every few years — which overwhelms hungry animals so at least some seeds survive to sprout. Scientists tracked 50 years of beech seed data in the Netherlands and found this boom-and-bust pattern collapsed around 2008, replaced by a trickle of seeds every year. That steady trickle is a disaster for the trees: animals now eat nearly three times as many seeds, and there aren't enough trees releasing pollen at the same time for good fertilization.
Key Findings
Synchrony and year-to-year variation in beechnut production declined significantly, with a masting breakdown occurring in the late 2000s after which seed output became consistently low rather than episodic.
Predation risk on seeds increased nearly three-fold following the masting breakdown, while pollination efficiency also declined — together substantially reducing the reproductive fitness benefits that masting normally provides.
Temperature changes (but not precipitation changes) over time partially explained the shift in masting patterns, yet climate alone cannot account for the full breakdown, implicating additional unidentified interacting factors.
chevron_right Technical Summary
European beech trees in the Netherlands have stopped their boom-and-bust seed cycles since the late 2000s, now producing low but steady crops every year. This 'masting breakdown' means seeds are more likely to be eaten by predators and less likely to be pollinated, threatening the trees' long-term reproduction — and warming temperatures are only part of the explanation.
Abstract Preview
Masting, highly synchronised but temporally variable seed production, is initiated by weather cues and is thus highly sensitive to climate change. Changes in these cues can lead to a masting breakd...
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Fagus sylvatica, the European beech or common beech, is a large deciduous tree in the beech family with smooth silvery-grey bark, large leaf area, and a short trunk with low branches. It is native to much of Europe, growing in humid climates.