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Plant Focus

Quercus macdougallii
A rare oak endemic to the Sierra Juárez in Oaxaca

Are Resource Dynamics a Necessity for Oak Masting?

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Ian Pearse

Published May 2016 International Oaks No. 27: 245–254


Masting, the highly variable and synchronous production of fruits or seeds, is an important reproductive strategy in oaks. Variable acorn production has broad consequences that cascade through oak ecosystems. While the effects of masting are widespread, researchers have only recently begun to understand the factors that control the boom and bust pattern of seed crops. One point of controversy in explaining masting is the degree to which resources and weather patterns explain variation in seed set between years. Theories that emphasize resources suggest that large seed crops require more resources than can be accumulated in a single year. Theories that emphasize weather point out that populations of oaks synchronize their production over hundreds of kilometers, and it would be difficult to explain such geographic patterns without equally large geographic patterns of weather. I argue that to disentangle the relative role of weather and resources in oak masting, we need to better understand the fundamental resource dynamics of oak trees and to explore the mechanisms by which oaks perceive and respond to weather. I highlight the key theories that explain oak masting, and I suggest further experiments and observations that can disentangle different explanations of masting.


acorn production, pollination, resource budget


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