Primates and Dung Beetles: Two Dispersers Are Better than One in Secondary Forest

  • Laurence Culot
  • Marie-Claude Huynen
  • Eckhard W. Heymann
Article

Abstract

Primary seed dispersal by primates (phase I) followed by secondary seed dispersal by dung beetles (phase II) is a common diplochorous system in tropical forests. In such systems, phase I affects the occurrence/outcome of phase II, triggering cascading effects along the chain of plant recruitment with direct consequences on seed dispersal effectiveness. However, we know very little regarding whether seed dispersal effectiveness is increased or decreased by phase II and whether this effect is consistent among habitats. Using a primate–dung beetle diplochorous system, we determined 1) the characteristics of phase I that may affect phase II; 2) the pathways relating biotic/abiotic factors to seed/seedling survival; and 3) if the direction and/or magnitude of phase II effects on seed dispersal effectiveness depend on phase I characteristics. We marked and characterized the dispersal characteristics of 981 seeds dispersed by two tamarin species (Saguinus mystax, Leontocebus nigrifrons) and checked the fate of 503 of them for ≥1 year. Seeds dispersed by L. nigrifrons and seeds surrounded by larger amounts of dung were more likely to be buried by dung beetles. Burial increased seed survival in secondary forest while low seed density increased germination in both habitats. Seed burial increased seed dispersal effectiveness more strongly in secondary (+52.2%) vs. in primary forest (+5.0%), in L. nigrifrons (+12.9%) vs. in S. mystax (+7.9%) feces, and in larger fecal portions (+22.1%) vs. in small–medium ones (+7.3–7.4%). In conclusion, two seed dispersers are more effective than one only in secondary forest, and the magnitude of increase of seed dispersal effectiveness with phase II depends on how the seeds are primarily dispersed.

Keywords

Context dependence Primary and secondary dispersal Seed burial Seed survival Seedling recruitment 

Notes

Acknowledgements

We are grateful to our field assistant, Jeisen Shahuano Tello, for his help on the field, and to Ricardo Zárate and Carlos Amasifuen for the identification of plant species and forest characterization. We thank Ellen Andresen and three anonymous reviewers for their useful comments on a previous version of the article, as well as the editor-in-chief, Dr. Joanna M. Setchell, and the guest editor, Dr. Onja H. Razafindratsima. This study was made possible thanks to a grant from FRIA (Fonds pour la formation à la recherche dans l’industrie et dans l’agriculture) and FNRS (Fonds National de la Recherche Scientifique), Belgium, to L. Culot. L. Culot was financed by a FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) grant during the writing of this article (2014/14739-0). We thank Drs. Yamato Tsuji, Hiroki Sato, and Onja H. Razafindratsima for inviting us to contribute to this special issue.

Supplementary material

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ESM 1 (DOCX 88 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratório de Primatologia, Departamento de Zoologia, Instituto de BiociênciasUniversidade Estadual Paulista (UNESP)Rio ClaroBrazil
  2. 2.Behavioral Biology Unit, Primatology Research GroupUniversity of LiègeLiègeBelgium
  3. 3.Abteilung Verhaltensökologie & Soziobiologie, Deutsches Primatenzentrum (DPZ)GöttingenGermany

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