Multitrophic diversity effects of network degradation

Elizabeth Nichols, Carlos A. Peres, Joseph E. Hawes, Shahid Naeem

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
11 Downloads (Pure)


Predicting the functional consequences of biodiversity loss in realistic, multitrophic communities remains a challenge. No existing biodiversity–ecosystem function study to date has simultaneously incorporated information on species traits, network topology, and extinction across multiple trophic levels, while all three factors are independently understood as critical drivers of post-extinction network structure and function. We fill this gap by comparing the functional consequences of simulated species loss both within (monotrophic) and across (bitrophic) trophic levels, in an ecological interaction network estimated from spatially explicit field data on tropical fecal detritus producer and consumers (mammals and dung beetles). We simulated trait-ordered beetle and mammal extinction separately (monotrophic extinction) and the coextinction of beetles following mammal loss (bitrophic extinction), according to network structure. We also compared the diversity effects of bitrophic extinction models using a standard monotrophic function (the daily production or consumption of fecal detritus) and a unique bitrophic functional metric (the proportion of daily detritus production that is consumed). We found similar mono- and bitrophic diversity effects, regardless of which species traits were used to drive extinctions, yet divergent predictions when different measures of function were used. The inclusion of information on network structure had little apparent effect on the qualitative relationship between diversity and function. These results contribute to our growing understanding of the functional consequences of biodiversity from real systems and underscore the importance of species traits and realistic functional metrics to assessments of the ecosystem impacts of network degradation through species loss.
Original languageEnglish
Pages (from-to)4936-4946
Number of pages11
JournalEcology and Evolution
Issue number14
Early online date21 Jun 2016
Publication statusPublished - Jul 2016


  • Biodiversity–ecosystem function
  • coextinction
  • dung beetles
  • fecal detritus
  • food webs
  • interaction networks
  • mammals
  • node loss
  • trophic interaction
  • tropical forest

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