The Moran effect and environmental vetoes: Phenological synchrony and drought drive seed production in a Mediterranean oak

Michał Bogdziewicz, Marcos Fernández-Martínez, Raul Bonal, Jordina Belmonte, Josep Maria Espelta

Research output: Contribution to journalArticleResearchpeer-review

37 Citations (Scopus)

Abstract

© 2017 The Author(s) Published by the Royal Society. All rights reserved. Masting is the highly variable production of synchronized seed crops, and is a common reproductive strategy in plants.Weather has long been recognized as centrally involved in driving seed production in masting plants. However, the theory behind mechanisms connecting weather and seeding variation has only recently been developed, and still lacks empirical evaluation. We used 12-year long seed production data for 255 holm oaks (Quercus ilex), as well as airborne pollen and meteorological data, and tested whether masting is driven by environmental constraints: phenological synchrony and associated pollination efficiency, and drought-related acorn abscission. We found that warmsprings resulted in short pollen seasons, and length of the pollen seasons was negatively related to acorn production, supporting the phenological synchrony hypothesis. Furthermore, the relationship between phenological synchrony and acorn production was modulated by spring drought, and effects of environmental vetoes on seed production were dependent on last year’s environmental constraint, implying passive resource storage. Both vetoes affectedamong-tree synchrony in seed production. Finally, precipitation preceding acorn maturationwas positively related to seed production, mitigating apparent resource depletion following high crop production in the previous year. These results provide new insights into mechanisms beyond widely reported weather and seed production correlations.
Original languageEnglish
Article number20171784
JournalProceedings of the Royal Society B: Biological Sciences
Volume284
Issue number1866
DOIs
Publication statusPublished - 15 Nov 2017

Keywords

  • Environmental constraint
  • Mast seeding
  • Moran effect
  • Phenological synchrony hypothesis
  • Seed abscission
  • Seed production

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