Ecological Research

, Volume 29, Issue 6, pp 1115–1129 | Cite as

Soil seed bank dynamics in response to an extreme flood event in a riparian habitat

  • Olusegun O. Osunkoya
  • Sadiq Ali
  • Thi Nguyen
  • Christine Perrett
  • Asad Shabbir
  • Sheldon Navie
  • Amalia Belgeri
  • K. Dhileepan
  • Steve Adkins
Original Article

Abstract

A significantly increased water regime can lead to inundation of rivers, creeks and surrounding floodplains- and thus impact on the temporal dynamics of both the extant vegetation and the dormant, but viable soil-seed bank of riparian corridors. The study documented changes in the soil seed-bank along riparian corridors before and after a major flood event in January 2011 in southeast Queensland, Australia. The study site was a major river (the Mooleyember creek) near Roma, Central Queensland impacted by the extreme flood event and where baseline ecological data on riparian seed-bank populations have previously been collected in 2007, 2008 and 2009. After the major flood event, we collected further soil samples from the same locations in spring/summer (November–December 2011) and in early autumn (March 2012). Thereafter, the soils were exposed to adequate warmth and moisture under glasshouse conditions, and emerged seedlings identified taxonomically. Flooding increased seed-bank abundance but decreased its species richness and diversity. However, flood impact was less than that of yearly effect but greater than that of seasonal variation. Seeds of trees and shrubs were few in the soil, and were negatively affected by the flood; those of herbaceous and graminoids were numerous and proliferate after the flood. Seed-banks of weedy and/or exotic species were no more affected by the flood than those of native and/or non-invasive species. Overall, the studied riparian zone showed evidence of a quick recovery of its seed-bank over time, and can be considered to be resilient to an extreme flood event.

Keywords

Disturbance Ecosystem resiliency Extreme events Inundation Riparian-zone Seed-bank Vegetation dynamics Weeds 

Supplementary material

11284_2014_1198_MOESM1_ESM.xls (62 kb)
Supplementary material 1 (XLS 62 kb)

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Copyright information

© Crown Copyright as represented by the State of Queensland (Department of Agriculture, Fisheries and Forestry) 2014

Authors and Affiliations

  • Olusegun O. Osunkoya
    • 1
    • 6
  • Sadiq Ali
    • 2
    • 3
  • Thi Nguyen
    • 2
    • 4
  • Christine Perrett
    • 1
  • Asad Shabbir
    • 2
    • 5
  • Sheldon Navie
    • 2
  • Amalia Belgeri
    • 2
  • K. Dhileepan
    • 1
  • Steve Adkins
    • 2
  1. 1.Invasive Plant and Animal Science Unit, Biosecurity Queensland, Department of Agriculture, Fisheries and ForestryEcosciences PrecinctBrisbaneAustralia
  2. 2.Tropical and Subtropical Weed Research Unit, School of Agriculture and Food SciencesUniversity of QueenslandBrisbaneAustralia
  3. 3.Department of Weed ScienceUniversity of AgriculturePeshawarPakistan
  4. 4.Department of Ecology and Evolutionary Biology, Faculty of BiologyUniversity of ScienceHo Chi Minh CityVietnam
  5. 5.Institute of Agricultural SciencesUniversity of the PunjabLahorePakistan
  6. 6.College of Marine and Environmental SciencesJames Cook UniversityCairns CampusAustralia

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