TY - JOUR
T1 - Individual resource limitation combined with population-wide pollen availability drives masting in the valley oak (Quercus lobata)
AU - Pesendorfer, Mario B.
AU - Koenig, Walter D.
AU - Pearse, Ian S.
AU - Knops, Johannes M.H.
AU - Funk, Kyle A.
N1 - Publisher Copyright:
© 2016 British Ecological Society.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - Masting, the synchronized production of variable seed crops, is widespread among woody plants, but there is no consensus about the underlying proximate mechanisms. To understand this population-level behaviour, it is necessary to dissect the behaviour of individual trees as well as the interactions that synchronize them. Here, we test a model of masting in which variability in seed set is driven by resource limitation within trees and synchrony is driven by pollen limitation due to phenological asynchrony in some years. We used a 35-year seed set data set and a 12-year phenological data set to analyse seed production of 84 valley oaks (Quercus lobata) in central coastal California. Individual trees varied tremendously in their seed production patterns; trees with high levels of seed production were less variable over time, but showed stronger negative autocorrelation between years, suggesting that they are more resource-limited than unproductive trees. In years of more asynchronous flowering, Q. lobata produced fewer seeds, consistent with the importance of phenological synchrony. We parametrized a model with these results to investigate how individual resource limitation and population-wide pollen limitation - a consequence of asynchronous flowering during cold spring temperatures - interact to shape annual variation in seed production. The model illustrates that this proximate abiotic driver can synchronize the behaviour of individuals, resulting in population-wide seed production patterns that closely resemble the field data. Synthesis. Our findings support the hypothesis that an interaction between two proximate mechanisms, individual resource limitation and environmental variation affecting population-wide pollen availability, drives masting in this population of Quercus lobata. This combination of internal and external proximate drivers may underlie masting behaviour in many wind-pollinated plants. We use a simulation model parametrized with data from a 35-year data set to demonstrate that the combination of two proximate mechanisms, individual resource limitation and population-wide pollen limitation, can result in population-level seed production behavior that closely resembles masting behavior in a Mediterranean oak species.
AB - Masting, the synchronized production of variable seed crops, is widespread among woody plants, but there is no consensus about the underlying proximate mechanisms. To understand this population-level behaviour, it is necessary to dissect the behaviour of individual trees as well as the interactions that synchronize them. Here, we test a model of masting in which variability in seed set is driven by resource limitation within trees and synchrony is driven by pollen limitation due to phenological asynchrony in some years. We used a 35-year seed set data set and a 12-year phenological data set to analyse seed production of 84 valley oaks (Quercus lobata) in central coastal California. Individual trees varied tremendously in their seed production patterns; trees with high levels of seed production were less variable over time, but showed stronger negative autocorrelation between years, suggesting that they are more resource-limited than unproductive trees. In years of more asynchronous flowering, Q. lobata produced fewer seeds, consistent with the importance of phenological synchrony. We parametrized a model with these results to investigate how individual resource limitation and population-wide pollen limitation - a consequence of asynchronous flowering during cold spring temperatures - interact to shape annual variation in seed production. The model illustrates that this proximate abiotic driver can synchronize the behaviour of individuals, resulting in population-wide seed production patterns that closely resemble the field data. Synthesis. Our findings support the hypothesis that an interaction between two proximate mechanisms, individual resource limitation and environmental variation affecting population-wide pollen availability, drives masting in this population of Quercus lobata. This combination of internal and external proximate drivers may underlie masting behaviour in many wind-pollinated plants. We use a simulation model parametrized with data from a 35-year data set to demonstrate that the combination of two proximate mechanisms, individual resource limitation and population-wide pollen limitation, can result in population-level seed production behavior that closely resembles masting behavior in a Mediterranean oak species.
KW - Mast fruiting
KW - Masting
KW - Pollen limitation
KW - Quercus lobata
KW - Reproductive ecology
KW - Resource limitation
UR - http://www.scopus.com/inward/record.url?scp=84959422937&partnerID=8YFLogxK
U2 - 10.1111/1365-2745.12554
DO - 10.1111/1365-2745.12554
M3 - Article
AN - SCOPUS:84959422937
SN - 0022-0477
VL - 104
SP - 637
EP - 645
JO - Journal of Ecology
JF - Journal of Ecology
IS - 3
ER -