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LERNZ Collaborators

Dr Roger Young

Coastal and Freshwater Resources, Cawthron Institute

Roger’s work has included development of new tools for measuring river ecosystem health using direct measurements of ecosystem processes/functions. Scientists within the EU, Australia, Canada and the USA are now advocating this approach and seeking advice on how it is being used in New Zealand. Roger strongly believes in the need for integrated approaches to resource management and enjoys his involvement in interdisciplinary teams working with the community to resolve resource management issues. Recent examples of this include: 1) a comparison of Maori cultural and scientific methods for river health assessment that was conducted in association with iwi from the Motueka Catchment, and 2) working with dairy farmers to investigate the effects of stock crossings on water quality and encouraging installation of bridges to mitigate contaminant loadings.

E-mail: Roger.Young@cawthron.org.nz

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Publications

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Journal, book, and conference publications

Young R.G., Wilkinson J., Hay J., Hayes, J.W. 2010. Movement and mortality of adult brown trout in the Motupiko River, New Zealand: effects of water temperature, flow and flooding. Transactions of the American Fisheries Society 139: 137-146.

Young, R.G., Collier, K.J. 2009. Contrasting responses to catchment modification among a range of functional and structural indicators of river ecosystem health. Freshwater Biology 54: 2155-2170.

Collier, K.J., Clapcott, J.E., Young, R.G. 2009. Influence of human pressures on large river structure and function. Prepared for Department of Conservation. Centre for Biodiversity and Ecology Research, University of Waikato, Contract Report 95. 38 p.

Olsen, D.A., Young, R.G. 2009. Significance of river-aquifer interactions for reach-scale thermal patterns and trout growth potential in the Motueka River, New Zealand. Hydrogeology Journal 17: 175-183.

Fenemor, A., Deans, N., Davie, T., Allen, W., Dymond, J., Kilvington, M., Phillips, C., Basher, L., Gillespie, P., Young, R., Sinner, J., Harmsworth, G., Atkinson, M., Smith, R. 2008. Collaboration and modelling – tools for integration in the Motueka catchment, New Zealand. Water SA 34: 448-455.

Young R.G., Harmsworth, G., Walker, D., James, T. 2008. Linkages between cultural and scientific indicators of river and stream health. Motueka Integrated Catchment Management (Motueka ICM) Programme Report – Prepared for Stakeholders of the Motueka Integrated Catchment Management Programme.

Young, R.G., Matthaei, C.D., Townsend, C.R. 2008. Organic matter breakdown and ecosystem metabolism: functional indicators for assessing river ecosystem health. Journal of the North American Benthological Society 27: 605-625.

Clapcott, J.E., Young, R.G. 2008. Spatial variation of functional indicators in Waikato River. Prepared for Environment Waikato. Cawthron Report No. 1226. 20 p.

Young, R.G. 2007. Life in freshwater. Te Ara, the Encyclopedia of New Zealand. http://www.teara.govt.nz

Young, R.G. 2007. A trial of wood decomposition rates as an ecological assessment tool in large rivers. Prepared for West Coast Regional Council. Cawthron Report No. 1339. 6 p.

Young, R.G. 2006. Seasonal patterns in ecosystem metabolism in five Auckland rivers. Prepared for Auckland Regional Council. Cawthron Report No. 1226. 9 p.

Young, R.G., Collier, K.J. 2006. Spatial variation in functional indicators for non-wadeable streams. Prepared for Environment Waikato. Cawthron Report No. 1171. 14 p.

Young, R.G., Quarterman, A.J., Eyles, R.F., Smith, R.A., Bowden, W.B 2005. Water quality and thermal regime of the Motueka River: influences of land cover, geology and position in the catchment. New Zealand Journal of Marine and Freshwater Research 39: 803-825.

Young, R.G., Keeley, N.B., Shearer, K.A., Crowe, A.L.M. 2004. Impacts of diquat herbicide and mechanical excavation on spring fed drains in Marlborough. Science for Conservation 240. Department of Conservation, Wellington. 50 p.

Davies-Colley, R.J., Nagels, J.W., Smith, R.A., Young, R.G., Phillips, C.J. 2004. Water quality impact of a dairy cow herd crossing a stream. New Zealand Journal of Marine and Freshwater Research 38: 569-576.

Young, R.G., Smart, G.M., Harding, J.S. 2004. Impacts of hydro-dams, irrigation schemes and river control works. Pp. 37.1- 37.16. In Harding, J.S., Mosely, M.P., Pearson, C, Sorrell, B. (eds.) Freshwaters of New Zealand. New Zealand Hydrological Society and New Zealand Limnological Society.

Young, R.G., Hayes, J.W. 2004. Angling pressure and trout catchability: behavioral observations of brown trout in two New Zealand backcountry rivers. North American Journal of Fisheries Management 24: 1203-1213.

Hughes, N. H., Hayes, J. W., Shearer, K. A., Young, R. G. 2003. Testing a model of drift-feeding using 3-D videography of wild brown trout, Salmo trutta, in a New Zealand river. Canadian Journal of Fisheries and Aquatic Sciences 60: 1462-1476.

Shearer, K.A., Stark, J.D. Hayes J.W. Young, R.G. 2003. Relationships between drifting and benthic invertebrates in three New Zealand rivers and implications for drift-feeding fish. New Zealand Journal of Marine and Freshwater Research 37: 809-820.

Huryn, A.D., Riley, R.H., Young, R.G., Peacock, K., Arbuckle, C.J. 2002. Natural-abundance stable C and N isotopes indicate weak upstream-downstream linkage of food webs in a grassland river. Archiv für Hydrobiologie 153: 177-196.

Young, R.G., Hayes, J.W. 2001. Assessing the accuracy of drift dive estimates of brown trout (Salmo trutta) abundance in two New Zealand rivers: a mark-resighting study. New Zealand Journal of Marine and Freshwater Research 35: 269-275.

Huryn, A.D., Riley, R.H., Young, R.G., Arbuckle, C.J., Peacock, K., Lyon, G. 2001. Temporal shift in contribution of terrestrial organic matter to consumer production in a grassland river. Freshwater Biology 46: 213-226.

Biggs, B.J.F., Francoeur, S., Huryn, A.D., Young, R.G., Arbuckle, C.J., Townsend, C.R. 2000. Trophic cascades in streams: effects of nutrient enrichment on autotrophic and consumer benthic communities under two different fish predation regimes. Canadian Journal of Fisheries and Aquatic Sciences 57: 1380-1394.

Young, R.G., Huryn, A.D. 1999. Effects of land-use on stream metabolism and organic matter turnover. Ecological Applications 9: 1359-1376.

Harding, J.S., Young, R.G., Hayes, J.W., Shearer, K.A., Stark, J.D. 1999. Changes in agricultural intensity and river health along a river continuum. Freshwater Biology 42: 345-357.

Young, R.G., Huryn, A.D. 1998. Improvements to the diurnal upstream-downstream dissolved oxygen change technique for determining whole-stream metabolism in small streams. Canadian Journal of Fisheries & Aquatic Sciences 55: 1784-1785.

Young, R.G., Huryn, A.D. 1997. Longitudinal patterns of organic matter transport and turnover along a New Zealand grassland river. Freshwater Biology 38: 93-107.

Young, R.G., Huryn, A.D. 1996. Interannual variation in discharge controls ecosystem metabolism along a grassland river continuum. Canadian Journal of Fisheries & Aquatic Sciences 53: 2199-2211.

Young, R.G., Huryn, A.D., Townsend, C.R. 1994. Effects of agricultural development on processing of tussock leaf litter in high country New Zealand streams. Freshwater Biology 32: 413-427.