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Benchmarking Riparian Vegetation Quality in Recovering Rivers: Implications for Management of Novel Ecosystems.

Elisha Duxbury1, Kirstie Fryirs2, Michelle R Leishman2

  • 1School of Natural Sciences, Macquarie University, North Ryde, NSW, Australia. elisha.duxbury@hdr.mq.edu.au.

Environmental Management
|November 21, 2024
PubMed
Summary

Riparian vegetation is returning to Australian rivers but often remains a mix of native and exotic species. Improving vegetation quality requires adapting management to these novel ecosystems and setting realistic rehabilitation goals.

Keywords:
Biogeomorphic successionGeomorphic recoveryNature-based solutionsRiver rehabilitationUnassisted river restorationVegetation management

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Area of Science:

  • Environmental Science
  • River Ecology
  • Restoration Ecology

Background:

  • Rivers globally show widespread vegetation loss due to human activity.
  • Eastern Australian rivers are experiencing natural riparian vegetation regrowth alongside geomorphic recovery.
  • Understanding the condition of this returning vegetation is crucial for effective river management.

Purpose of the Study:

  • To assess riparian vegetation condition on rivers undergoing geomorphic recovery in New South Wales (NSW).
  • To analyze factors influencing vegetation condition, including geomorphic recovery stage and geomorphic units.
  • To inform management strategies for improving riparian vegetation quality in recovering river systems.

Main Methods:

  • Development and application of a novel rapid riparian assessment method.
  • Assessment included vegetation cover, native species richness, and native-to-exotic species ratio.
  • Data collected across 36 river reaches in three NSW climatic regions, three geomorphic recovery stages, and three geomorphic units (bars, benches, floodplains).

Main Results:

  • Most assessed river reaches exhibited poor or moderate riparian vegetation condition; only three were rated as good.
  • Native species richness and proportion of native cover increased with later geomorphic recovery stages and on benches/floodplains compared to bars.
  • Recovering riparian vegetation predominantly comprised mixed native and exotic species, forming novel communities.

Conclusions:

  • Riparian vegetation recovery in geomorphically adjusting rivers results in novel ecosystems, not a return to pre-disturbance states.
  • Effective, large-scale vegetation improvement necessitates management interventions tailored to these novel ecosystems.
  • Realistic rehabilitation targets must acknowledge the ongoing geomorphic and vegetative recovery processes.