Letter: Variable and complex food web structures revealed by exploring missing trophic links between birds and biofilm

T. Kuwae, E. Miyoshi, S. Hosokawa, T. Amano, T. Moriya, M. Kondoh, R.C. Ydenberg, R.W. Elner

Research output: Contribution to journalArticleAcademicpeer-review

64 Citations (Scopus)

Abstract

Food webs are comprised of a network of trophic interactions and are essential to elucidating ecosystem processes and functions. However, the presence of unknown, but critical networks hampers understanding of complex and dynamic food webs in nature. Here, we empirically demonstrate a missing link, both critical and variable, by revealing that direct predator-prey relationships between shorebirds and biofilm are widespread and mediated by multiple ecological and evolutionary determinants. Food source mixing models and energy budget estimates indicate that the strength of the missing linkage is dependent on predator traits (body mass and foraging action rate) and the environment that determines food density. Morphological analyses, showing that smaller bodied species possess more developed feeding apparatus to consume biofilm, suggest that the linkage is also phylogenetically dependent and affords a compelling re-interpretation of niche differentiation. We contend that exploring missing links is a necessity for revealing true network structure and dynamics.
Original languageEnglish
Pages (from-to)347-356
JournalEcology Letters
Volume15
Issue number4
DOIs
Publication statusPublished - 2012

Keywords

  • knots calidris-canutus
  • western sandpipers
  • ecological networks
  • stable isotopes
  • dunlin
  • stability
  • dynamics
  • mauri
  • size
  • populations

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