Temporal pattern of seed dispersal of wild olive ("Olea europaea" var. "sylvestris")tis effect on intra-specific competition

  1. Alcántara, Julio M. 1
  2. Rey Zamora, Pedro José 1
  3. Valera, F. 1
  4. Gutiérrez, J. E. 1
  5. Sánchez Lafuente, Alfonso M. 1
  1. 1 Universidad de Jaén
    info

    Universidad de Jaén

    Jaén, España

    ROR https://ror.org/0122p5f64

Journal:
Lagascalia

ISSN: 0210-7708

Year of publication: 1997

Volume: 19

Issue: 1-2

Pages: 583-590

Type: Article

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Abstract

We periodically surveyed two populations of wild olive trees in two plots, one sparse scrubland (plot S) and one dense scrubland (plot D), in order to obtain: 1, the fortnight percentage of ripe fruits and fruit removal; 2, the density of avian seed dispersers; 3, the availability of wild olive fruits in the plots and the energetic demands of the seed dispersers; and 4, only for plot D, the frequency of wild olive seeds in diet samples of Blackcaps (Sylvia wricapilia), the main wild olive fruit consumer in the study area. The estimated energetic offer of fruits in plot S resulted two fold the energetic demands of the seed dispersers; the offer in plot D was smaller than the energetic demand. The mean percentage of fruit removal in plot S was comparatively lower, and its range wider, than in plot D. However, the Mean percentage of fruit removal did not significantly differ between plots, which indicates the occurrence of infra-specific competition in both plots.

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