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Spatiotemporal mating pattern variation in a wind-pollinated Mediterranean shrub.

Rafael G Albaladejo1, Santiago C González-Martínez, Myriam Heuertz

  • 1Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Spain. albaladejo@us.es

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Summary

Mating patterns in wind-pollinated Pistacia lentiscus varied yearly, with higher correlated paternity observed in 2007. Pollen dispersal showed spatial structure, influenced by male plant clumping and density, impacting genetic diversity in Mediterranean ecosystems.

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Area of Science:

  • Ecology
  • Population Genetics
  • Plant Reproduction

Background:

  • Mating patterns in wind-pollinated species are not well understood.
  • Pistacia lentiscus is a wind-pollinated, dioecious shrub found in Mediterranean ecosystems.

Purpose of the Study:

  • To analyze the spatiotemporal variation in mating patterns of Pistacia lentiscus.
  • To investigate the influence of population density and male plant distribution on mating success.

Main Methods:

  • Genotyping of 904 seeds from 30 mother plants using eight microsatellite markers.
  • Analysis of mating system estimates over two consecutive flowering seasons (2006 and 2007).
  • Application of smoothing interpolation and numerical simulations to assess pollen dispersal and correlated mating.

Main Results:

  • Significant year-to-year differences in mating system estimates, particularly correlated paternity.
  • Effective number of fathers varied between years (11.8 in 2007, 33.6 in 2006).
  • Spatially structured pollen clouds with varying genetic diversity; evidence of restricted pollen dispersal at short distances in 2007.

Conclusions:

  • Yearly variations in mating patterns are influenced by factors like phenological variation and population structure.
  • Male plant clumping and decreasing plant density increase correlated mating in wind-pollinated species.
  • Findings are relevant to understanding impacts of habitat disturbance on Mediterranean plant populations.