Effects of progressive catchment harvesting on stream invertebrates in two contrasting regions of New Zealand's North Island
K. J. Collier A B C and B. J. Smith AA National Institute of Water and Atmospheric Research Ltd., PO Box 11-115, Hamilton, New Zealand.
B Present Address: Environment Waikato, PO Box 4010, Hamilton, New Zealand.
C Corresponding author. Email: kevin.collier@ew.govt.nz
Marine and Freshwater Research 56(1) 57-68 https://doi.org/10.1071/MF04105
Submitted: 24 May 2004 Accepted: 25 November 2004 Published: 4 February 2005
Abstract
We examined changes in stream habitat and benthic invertebrate communities in two contrasting regions of New Zealand’s North Island over a 9–10-year period as pine forest harvesting progressed through the catchments. Increases in streambed cover by sand/silt, wood and macrophytes were recorded as harvesting progressed, but little change was observed in qualitative periphyton abundance. Despite similar high-level taxonomic structure of invertebrate communities between the two regions, differences in percentage and log-transformed abundance indicated an effect of landscape context that reflected different hydrologies and bed-substratum stabilities. Within regions, ordination plots indicated broadly distinct site clusters that persisted through time and reflected variations in stream size, substratum composition, periphyton abundance and degree of catchment harvesting. Generally, few of the invertebrate community metrics examined showed clear responses to progressive catchment or onsite harvesting relative to previous intra- and inter-annual variation. The most noticeable exceptions were percentage Ephemeroptera, Plecoptera and Trichoptera (excluding Hydroptilidae) abundance and percentage Elmidae abundance, which were negatively and positively correlated, respectively, with percentage catchment harvested. We identify three broad response categories to catchment harvesting that reflect subsidy–stress effects as logging progressed and discuss the relevance of these findings to potential pine forest harvesting effects in southern Australia.
Extra keywords: benthos, landscape context, logging, Pinus radiata, plantation forestry.
Acknowledgments
Thanks to John Quinn and Wayne Linklater for setting up the Taneatua study and John, Aslan Wright-Stow, Corina Kemp, Steph Parkyn, Kerry Costley, Eddie Bowman and Graham Timpany for assisting at various times with field work and provision of flow data. Clive Tozer, Dave Evans, Gavin Williamson and Glenn Sutton of Fletcher Challenge Forests and its various incarnations provided financial support for continued sampling. Michael Elix, Colin Maunder and Rex King provided estimates of catchment area harvested. The Foundation for Research, Science and Technology also helped fund the study and the write-up of results, as part of contract CO4X0012 under subcontract to Forest Research. Constructive comments on draft manuscripts were provided by John Quinn and Mark Meleason of NIWA, and two anonymous referees.
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