Oecologia

, Volume 175, Issue 4, pp 1247–1256

Reconstructing past ecological networks: the reconfiguration of seed-dispersal interactions after megafaunal extinction

  • Mathias M. Pires
  • Mauro Galetti
  • Camila I. Donatti
  • Marco A. Pizo
  • Rodolfo Dirzo
  • Paulo R. GuimarãesJr.
Plant-microbe-animal interactions - Original research

Abstract

The late Quaternary megafaunal extinction impacted ecological communities worldwide, and affected key ecological processes such as seed dispersal. The traits of several species of large-seeded plants are thought to have evolved in response to interactions with extinct megafauna, but how these extinctions affected the organization of interactions in seed-dispersal systems is poorly understood. Here, we combined ecological and paleontological data and network analyses to investigate how the structure of a species-rich seed-dispersal network could have changed from the Pleistocene to the present and examine the possible consequences of such changes. Our results indicate that the seed-dispersal network was organized into modules across the different time periods but has been reconfigured in different ways over time. The episode of megafaunal extinction and the arrival of humans changed how seed dispersers were distributed among network modules. However, the recent introduction of livestock into the seed-dispersal system partially restored the original network organization by strengthening the modular configuration. Moreover, after megafaunal extinctions, introduced species and some smaller native mammals became key components for the structure of the seed-dispersal network. We hypothesize that such changes in network structure affected both animal and plant assemblages, potentially contributing to the shaping of modern ecological communities. The ongoing extinction of key large vertebrates will lead to a variety of context-dependent rearranged ecological networks, most certainly affecting ecological and evolutionary processes.

Keywords

Ecological networks Frugivory Modularity Mutualisms Pantanal Rewilding 

Supplementary material

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Supplementary material 1 (PDF 89 kb)
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Supplementary material 2 (PDF 73 kb)
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Supplementary material 3 (PDF 108 kb)
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Supplementary material 4 (PDF 82 kb)
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Supplementary material 5 (PDF 120 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Mathias M. Pires
    • 1
  • Mauro Galetti
    • 2
  • Camila I. Donatti
    • 3
  • Marco A. Pizo
    • 4
  • Rodolfo Dirzo
    • 3
  • Paulo R. GuimarãesJr.
    • 1
  1. 1.Departamento de Ecologia, Instituto de BiociênciasUniversidade de São PauloSão PauloBrazil
  2. 2.Departamento de EcologiaUniversidade Estadual PaulistaRio ClaroBrazil
  3. 3.Department of BiologyStanford UniversityStanfordUSA
  4. 4.Departamento de ZoologiaUniversidade Estadual PaulistaRio ClaroBrazil

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