Sedimentation effects on the benthos of streams and estuaries: a cross-ecosystem comparison
David J. Reid A D , Luca D. Chiaroni A , Judi E. Hewitt A , Drew M. Lohrer A , Christoph D. Matthaei B , Ngaire R. Phillips A , Mike R. Scarsbrook C , Brian J. Smith A , Simon F. Thrush A , Colin R. Townsend B , Kristel S. S. van Houte-Howes A and Aslan E. Wright-Stow A
+ Author Affiliations
- Author Affiliations
A National Institute of Water and Atmospheric Research, PO Box 11-115, Hamilton, New Zealand.
B Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand.
C DairyNZ Ltd, Private Bag 3221, Hamilton, New Zealand.
D Corresponding author. Email: davidjonreid@hotmail.com
Marine and Freshwater Research 62(10) 1201-1213 https://doi.org/10.1071/MF11056
Submitted: 7 March 2011 Accepted: 15 June 2011 Published: 29 September 2011
Abstract
Connected ecosystems can be detrimentally affected by the same stressor, such as occurs when excess fine sediment moves from streams into estuaries. However, no previous study has directly compared sedimentation effects across these ecosystems. Responses of benthic macroinvertebrate communities to sedimentation were predicted to vary between streams and estuaries, because of intersystem differences in the physical environment and representation of species traits. To compare these responses, fine terrigenous sediment was added simultaneously to replicated plots in stream-run habitats and the adjacent estuary. Although sediment addition to streams caused reduced invertebrate densities after 1 week, no changes in taxon richness or consistent changes in community structure were detected, and densities had recovered another week later. In contrast, sediment addition to estuarine sites caused large declines in invertebrate densities and changes in community structure, which remained evident at the innermost sites 16 days after addition. Across both systems, sedimentation effects were detectable only for some of the common taxa, and biological traits were not predictive of effects. The potential for more severe effects in estuaries should be considered when predicting the implications of land-use changes that may increase sedimentation, and when setting guidelines for maintaining stream and estuarine condition.
Additional keywords: benthic, community structure, integrated catchment management, land use, species traits.
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