Differences in mixed-species bird flocks across forest succession: Combining network analysis and trait-based ecology related to the fast-slow continuum

Yong Shen, Sergio Estrada-Villegas, María Natalia Umaña, Eben Goodale*, Scott Robinson, Qing Quan, Qiang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Secondary forests are increasingly important for biodiversity conservation and ecosystem functioning. Yet, we know little on how species interactions shift across the wide range of life history strategies in the context of forest succession, especially for non-trophic animal social systems. Using data from mixed-species flocks (hereafter MSFs) and life history and morphological traits from the ‘fast-slow’ continuum, we utilized a novel combination of network theory and trait-based ecology to examine the assembly of associations of MSFs among species with different fast-slow strategies across stages of forest succession that exhibit different degrees of forest complexity. MSFs formed the most connected and cohesive network in the intermediate successional stage. In contrast, we observed the least connected and cohesive network in the early stage, and a strongly connected but intermediately cohesive network in the late stage. Fast species with smaller body size and mass, and larger clutch size, were gradually replaced by slow species during succession. Interspecific associations generally shifted from those among similarly fast species (early stage) to associations between fast and slow species (intermediate stage), and finally to those among similarly slow species (late stage). We suggest that vegetation complexity (e.g. tree size, height, diversity and canopy cover), related to the availability of resources and number of niches, shaped the network structure and functional composition of MSFs. Although the late successional forests play an irreplaceable role in protecting forest specialists (i.e. slow species), intermediate stage forests should be also protected, because the large-sized networks formed by MSFs at intermediate stages can simultaneously conserve more species with varying ecological strategies. Read the free Plain Language Summary for this article on the Journal blog.

Original languageEnglish
Pages (from-to)1236-1249
Number of pages14
JournalFunctional Ecology
Volume38
Issue number5
DOIs
Publication statusPublished - 8 Mar 2024

Keywords

  • ecological networks
  • fast-slow trait continuum
  • forest succession
  • interspecific interactions
  • mixed-species bird flocks

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