Does flood rhythm drive ecosystem responses in tropical riverscapes?

T.D. Jardine, N.R. Bond, M.A. Burford, M.J. Kennard, D.P. Ward, P. Bayliss, Peter Davies, Michael Douglas, S.K. Hamilton, J.M. Melack, Neil Pettit, Brad Pusey, Robert Naiman, Danielle Warfe, S Bunn

Research output: Contribution to journalArticleResearchpeer-review

Abstract

© 2015 by the Ecological Society of America. Biotic communities are shaped by adaptations from generations of exposure to selective pressures by recurrent and often infrequent events. In large rivers, floods can act as significant agents of change, causing considerable physical and biotic disturbance while often enhancing productivity and diversity. We show that the relative balance between these seemingly divergent outcomes can be explained by the rhythmicity, or predictability of the timing and magnitude, of flood events. By analyzing biological data for large rivers that span a gradient of rhythmicity in the Neotropics and tropical Australia, we find that systems with rhythmic annual floods have higher fish species richness, more stable avian populations, and elevated rates of riparian forest production compared with those with arrhythmic flood pulses. Intensification of the hydrological cycle driven by climate change, coupled with reductions in runoff due to water extractions for human use and altered discharge from impoundments, is expected to alter the hydrologic rhythmicity of floodplain rivers with significant consequences for both biodiversity and productivity.
Original languageEnglish
Pages (from-to)684-692
Number of pages9
JournalEcology
Volume96
Issue number3
DOIs
Publication statusPublished - 2015

Keywords

  • Animals
  • Australia
  • Aves
  • Biodiversity
  • Birds
  • Climate Change
  • Ecosystem
  • Fishes
  • Floods
  • Forests
  • Mexico
  • Rivers
  • South America
  • adaptation
  • animal
  • biodiversity
  • bird
  • climate change
  • ecosystem
  • environmental disturbance
  • environmental response
  • fish
  • flood frequency
  • flooding
  • floodplain
  • forest
  • hydrological response
  • physiology
  • river
  • species richness

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