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Title: The response of hyporheic invertebrate communities to a large flood in the Hunter River, New South Wales
Contributor(s): Hancock, Peter J (author)
Publication Date: 2006
DOI: 10.1007/s10750-006-0110-7
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Abstract: Previous studies on recovery in hyporheic communities have found that communities rapidly return to predisturbance levels. However, most of these studies have concentrated on small floods or ones with shortreturn periods. I studied the impact of a large 1 in 6 year flood on the hyporheic community at 2 sites in the Hunter River, a large coastal river in New South Wales with a mean daily flow of 15 m³ s⁻¹. The flood peaked at 1270 m³ s⁻¹ and afterwards invertebrate densities at the 2 sites were 83 and 67% less than they were before. Recovery to pre-flood densities was slow but was aided by increases in the oligochaete and cyclopoid populations. At Site 1, there was a boom in oligochaete and cyclopoid numbers 61 d after the flood, but the communities resumed their pre-flood densities by Day 139. Recovery at Site 2 took 139 d. Most groundwater taxa (stygobites) living in the hyporheic zone did not recover from the disturbance when compared to non-stygobites. Apart from Microturbellaria and the harpacticoid 'Parastenocaris' sp., numbers of all stygobite taxa continued to decline after the flood, becoming absent after 61 d. The poor recovery of stygobites is probably due to their adaptations for survival in the relatively stable groundwater environment. This study shows that hyporheic communities are sensitive to large bed-moving floods and supports the hypothesis that ecotonal species with a strong affinity to one ecosystem can be poor at recovering from disturbances that occur in an adjacent ecosystem.
Publication Type: Journal Article
Source of Publication: Hydrobiologia, 568(1), p. 255-262
Publisher: Springer Netherlands
Place of Publication: The Netherlands
ISSN: 0018-8158
Field of Research (FOR): 060204 Freshwater Ecology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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