Roger Young
Coastal and Freshwater Group Manager – Freshwater
Qualifications
- PhD (Zoology). University of Otago, 1998
- BSc (Hons, Zoology/Chemistry). University of Otago, 1992
Role at Cawthron
Roger is the Group Manager for freshwater sciences at Cawthron. Roger's work involves a mix of government-funded research on river ecosystems, and commercial projects assisting a range of clients with freshwater management issues.
He is internationally recognised for development of new tools for measuring river ecosystem health using direct measurements of ecosystem processes and functions.
Roger strongly believes in the need for integrated approaches to resource management and enjoys involvement in interdisciplinary teams working with the community to resolve resource management issues.
He is also a member of the steering group for the Land, Air, Water Aotearoa (LAWA) website launched in mid-2014 to share environmental information from councils throughout New Zealand, including state and trend data from more than 1100 rivers.
Technical skills, experience and interests
- River ecology
- Water quality
- Ecosystem health
- Freshwater fisheries
- Integrated catchment management
- Limit setting
Professional affiliations
- Society for Freshwater Science
- New Zealand Freshwater Sciences Society
Conferences and presentations
Wagenhoff A, Young RG, Clapcott J, Goodwin E, Kilroy C, Pastor Oliveras A, Lau K, Lewis G 2013. In search of ecological thresholds – what can we learn from stressor response relationships to inform limit setting in streams? New Zealand Freshwater Sciences Society Conference, Hamilton, 19-23 August 2013.
Quinn JM, Rutherford K, Wilcock R, Young RG, Baisden T, Schiff S, English M 2013. Periphyton and nutrient interactions along the Tukituki River under drought, wet and normal summers. New Zealand Freshwater Sciences Society Conference, Hamilton, 19-23 August 2013.
Heath M, Wood S, Young RG, Ryan K 2013. Are low water column dissolved reactive phosphorus concentrations essential for benthic Phormidium blooms and toxin production? New Zealand Freshwater Sciences Society Conference, Hamilton, 19-23 August 2013.
Gabrielsson R, Holmes R, Hayes JW, Young RG 2013. Development of a sports fishery quality index for assessing effects of agricultural intensification. New Zealand Freshwater Sciences Society Conference, Hamilton, 19-23 August 2013.
Young RG, Doehring KA, Clapcott JE, Quinn JM 2013. Functional responses of stream ecosystems to riparian rehabilitation. New Zealand Freshwater Sciences Society Conference, Hamilton, 19-23 August 2013.
Young RG 2013. Incorporating elements of ecosystem function in river health monitoring. University of Konstanz, Konstanz, Germany, 29 July 2013.
Young RG, Doehring KA, Clapcott JE 2013. Stream ecosystem functional responses to riparian rehabilitation. Society for Freshwater Science 61st Annual Meeting, Jacksonville, Florida, USA, 19-23 May 2013.
Young RG, Clapcott JE, Neale M, Doehring KA 2013. Greater temporal variability in stream metabolism indicates land use disturbance. Symposium for European Freshwater Sciences, Munster, Germany, 1-5 July 2013.
Elosegi A, Young RG 2013. River doctors: the medical urgency metaphor in river management and restoration. German Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Germany. 10 June 2013.
Young RG 2013. Incorporating elements of ecosystem function in stream health monitoring. Swedish Agricultural University, Uppsala, Sweden. May 2013.
View Roger's ResearchGate profile
Publication links
- Young RG, Wagenhoff A, Holmes R, Newton MJ and Clapcott JE 2018. What is a healthy river?. Cawthron Report No. 3035. Prepared for Cawthron Foundation .
- Elosegi A, Gessner MO and Young RG 2017. River doctors: Learning from medicine to improve ecosystem management. Science of The Total Environment. Volume 595. Pages 294-302.
- Yates AG, Brua R, Culp JM, Young RG and Chambers PA 2017. Variation in stream metabolism and benthic invertebrate composition along longitudinal profiles of two contrasting river systems. Canadian Journal of Fisheries and Aquatic Sciences.
- Yates AG, Brua RB, Culp JM, Chambers PA and Young RG 2017. Variation in stream metabolism and benthic invertebrate composition along longitudinal profiles of two contrasting river systems. Canadian Journal of Fisheries and Aquatic Sciences. Published online.
- Wagenhoff A, Liess A, Pastor A, Clapcott JE, Goodwin E and Young RG 2017. Thresholds in ecosystem structural and functional responses to agricultural stressors can inform limit setting in streams. Freshwater Science. Volume 36, Issue 1. Pages 178-194.
- Wagenhoff A, Clapcott JE, Lau KEM, Lewis GD and Young RG 2017. Identifying congruence in stream assemblage thresholds in response to nutrient and sediment gradients for limit setting. Ecological Applications. Volume 27, Issue 2. Pages 469-484.
- Quinn JM, Green MO, Schallenberg M, Young RG and Tanner CC, Swales A 2017. Management and rehabilitation of aquatic ecosystems: introduction and synthesis. New Zealand Journal of Marine and Freshwater Research. Volume 51, Issue 1. Pages 1-6.
- Wood SA, Atalah J, Wagenhoff A, Brown L, Doehring KAM, Young RG and Hawes I 2017. Effect of river flow, temperature, and water chemistry on proliferations of the benthic anatoxin-producing cyanobacterium Phormidium. Freshwater Science. Volume 36, Issue 1. Pages 63-76.
- Aristi I, Clapcott JE, Acuta V, Elosegi A, Mills H, Wood SA and Young RG 2017. Forestry affects the abundance of Phormidium-dominated biofilms and the functioning of a New Zealand river ecosystem. Marine and Freshwater Research. Volume 68, Issue 9. Pages 1741-1751 .
- Clapcott JE, Young RG, Neale MW, Doehring KAM and Barmuta LA 2016. Land use affects temporal variation in stream metabolism. Freshwater Science. Volume 35. Pages 1164-1175.
- Heath MW, Wood SA, Young RG and Ryan KG 2016. The role of nitrogen and phosphorus in regulating Phormidium autumnale (Cyanobacteria) growth and anatoxin production. FEMS Microbiology Ecology. Volume 92, Issue 3: fiw021.
- Young RG, Clapcott JE and Simon K 2016. Ecosystem functions and stream health. Advances in New Zealand Freshwater Science. NZ Freshwater Sciences Society, NZ Hydrological Society.
- Heath MW, Wood SA, Brasell KA, Young RG and Ryan KG 2015. Development of habitat suitability criteria and in-stream habitat assessment for the benthic cyanobacteria Phormidium. River Research and Applications 31(1): 98-108. Origiginally published online in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/rra.2722.
- Heath MW, Wood SA, Barbieria RF, Young RG and Ryan KG 2014. Effects of nitrogen and phosphorus on anatoxin-a, homoanatoxin-a, dihydroanatoxin-a and dihydrohomoanatoxin-a production by Phormidium autumnale. Toxicon. Voume 92. Pages 179-185.
- Young RG and Clapcott JE 2014. Functional indicators of river health.
- Young RG and Doehring KAM 2014. Aquatic Ecology: Mitigation and management of options associated with water storage in the proposed Lee Reservoir: Addendum. Cawthron Report 1701A. Prepared for Tonkin & Taylor Ltd on behalf of the Waimea Water Augmentation Committee. 16 pages.
- Clapcott JE, Goodwin E, Young RG and Kelly D 2014. A multimetric approach for predicting the ecological integrity of New Zealand streams. Aquatic Ecosystems. Volume 415, Issue 3. Page 10.
- Young RG and Allen C 2013. Implications of different minimum flows in the Lower Waimea River. Cawthron Report 2414. Prepared for Tasman District Council. 6 pages.
- Young RG and Doehring KAM 2013. Advice on a progressive implementation programme for limit setting in the Tasman District. Cawthron Report 2358. Prepared for Tasman District Council.
- Wagenhoff A and Young RG 2013. Effects of willow removal on Australian and New Zealand stream ecosystems - A literature review of the potential risks and benefits. Prepared for Ministry of Business, Innovation and Employment project C01X1002: Maintenance and rehabilitation of aquatic ecosystems.
- Young RG, Allen C, Shearer KA, Doehring KAM, Berkett N, Holmes R and Hay J 2013. Ruataniwha water storage scheme - Aquatic ecology assessment of effects. Prepared for Hawke's Bay Regional Investment Company Limited. Cawthron Report 2307. 195 pages plus appendices.
- Collier KJ, Clapcott JE, Hamer MP and Young RG 2013. Extent estimates and land cover relationships for functional indicators in non-wadeable rivers. Ecological Indicators. Volume 34. Pages 53-59.
- Collier KJ, Clapcott JE, David BO, Death RG, Kelly D, Leathwick JL and Young RG 2013. Macroinvertebrate-pressure relationships in boatable New Zealand rivers - influence of underlying environment and sampling substrate. River Research and Applications 29(5): 645-659.
- Ausseil O, Hansford J, Waldron R and Young RG 2013. Ruataniwha water storage scheme – environmental flow optimisation. Prepared for Hawke's Bay Regional Investment Company Limited. 35 pages plus appendices.
- Fenemor A, Lilburne L, Green S and Young RG 2013. Assessing water quality risks and responses with increased irrigation in the Waimea Basin. Landcare Research Contract Report LC1246. Prepared for Waimea Water Augmentation Committee. 42 pages.
- Doehring KAM and Young RG 2012. Relationship between flow and dissolved oxygen in the Meadow Burn - Summer 2012. Cawthron Report 2246. Prepared for Environment Southland. 14 pages.
- Clapcott JE, Collier KJ, Death RG, Goodwin E, Harding JS, Kelly D, Leathwick JR and Young RG 2012. Quantifying relationships between land-use gradients and structural and functional indicators of stream ecological integrity. Freshwater Biology 57(1): 74-90.
- Wood SA and Young RG 2012. Review of Benthic Cyanobacteria monitoring programme 2012. Cawthron Report 2217. Prepared for Horizon Regional Council. 30 pages plus appendices.
- Wood SA, Smith FMJ, Heath MW, Palfroy T, Gaw S, Young RG and Ryan KG 2012. Within-mat variability in Anatoxin-a and Homoanatoxin-a production among Benthic Phormidium (Cyanobacteria) strains. Toxins 4(10): 900-912.
- Doehring KAM, Young RG and McIntosh AR 2012. Facilitation of upstream passage for juveniles of a weakly-swimming migratory galaxiid. New Zealand Journal of Marine and Freshwater Research 46(3): 303-313.
- Clapcott JE, Young RG, Ausseil O, Beech M and Haidekker S 2012. Envirolink tools project assessment (CAWX0903). Cawthron Report 2228. CAWX0903. Prepared for Envirolink. 16 pages.
- Allen C and Young RG 2012. Effects of flow abstraction on habitat availability and water quality in the Motupipi River. Cawthron Report 2233. Prepared for AP & KM Reilly Ltd. 13 pages plus appendices.
- Heath MW, Brasell K, Young RG, Wood SA and Ryan KG 2012. Hutt River Phormidium habitat suitability criteria and hydraulic habitat assessment. Victoria University Report. Prepared for Greater Wellington Regional Council.
- Schallenberg M, Kelly D, Clapcott JE, Death R, MacNeil C, Young RG, Sorrell B and Scarsbrook M 2011. Approaches to assessing ecological integrity in New Zealand freshwaters. Science for Conservation 307. Department of Conservation, Wellington. 86 pages.
- Doehring KAM, Young RG and McIntosh AR 2011. Factors affecting juvenile galaxiid fish passage at culverts. Marine and Freshwater Research 62(1): 38-45.
- Cornelisen CD, Gillespie PA, Kirs M, Young RG, Forrest RW, Barter PJ , Knight BR and Harwood VJ 2011. Motueka River plume facilitates transport of ruminant faecal contaminants into shellfish growing waters, Tasman Bay, New Zealand. New Zealand Journal of Marine & Freshwater Research 45(3): 477-495.
- Harmsworth GR, Young RG, Walker D, Clapcott JE and James T 2011. Linkages between cultural and scientific indicators of river and stream health. New Zealand Journal of Marine and Freshwater Research 45(3): 423-436 .
- Shearer KA and Young RG 2011. Influences of geology and land use on macroinvertebrate communities across the Motueka River catchment, New Zealand. New Zealand Journal of Marine & Freshwater Research 35, 437-454.
- Doehring KAM, Young RG, Hay J and Quarterman A 2011. Suitability of Dual-frequency Identification Sonar (DIDSON) to monitor juvenile fish movement at floodgates. New Zealand Journal of Marine & Freshwater Research 35, 413-422.
- Gillespie PA, Forrest RW, Knight BR, Cornelisen CD and Young RG 2011. Variation in nutrient loading from the Motueka River into Tasman Bay, New Zealand, 2005-2009: Implications for the river plume ecosystem. New Zealand Journal of Marine and Freshwater Research 45(3): 497-512.
- Wilkinson RJ, McKergow LA, Davies-Colley RJ, Ballantine DJ and Young RG 2011. Modelling storm event E. coli pulses from the Motueka and Sherry rivers in the South Island, New Zealand. New Zealand Journal of Marine and Freshwater Research 45(3): 369-393.
- Fenemor AD, Phillips C, Allen WJ, Young RG, Harmsworth GR, Bowden WB, Basher L, Gillespie PA, Kilvington M, Davies-Colley RJ, Dymond J, Cole A, Lauder G, Davie T, Smith RA, Markham S, Deans NA, Atkinson M and Collins A 2011. Integrated catchment management – interweaving social process and science knowledge. New Zealand Journal of Marine and Freshwater Research 45(3): 313-331.
- Doehring KAM and Young RG 2011. Water quality patterns in the Motupipi River in the Tasman District 2006-2009. Cawthron Report 1906. Prepared for Tasman District Council. 21 pages plus appendices.
- Fenemor AD, Young RG, Bowden WB, Phillips CJ and Allen WJ 2011. Integrated catchment management – a decade of research in the Motueka River catchment. New Zealand Journal of Marine & Freshwater Research 35: 307-311.
- Wilcock B, Young RG, Gibbs M and McBride G 2011. Continuous measurement & interpretation of dissolved oxygen data in rivers. NIWA Client Report HAM2011-010. Prepared for Horizons Regional Council. 76 pages.
- Olley R, Young RG, Closs GP, Kristensen EA, Bickel TO, Deans NA, Davey LN and Eggins SN 2011. Recruitment sources of brown trout identified by otolith trace element signatures. New Zealand Journal of Marine and Freshwater Research 45(3): 395-411.
- Clapcott JE, Young RG, Harding JS, Matthaei CD, Quinn JM and Death RG 2011. Sediment assessment methods - protocols and guidelines for assessing the effects of deposited fine sediment on in-stream values. Cawthron Institute, Nelson, New Zealand.
- Young RG and Hay J 2011. Relationship between flow and dissolved oxygen in the Meadow Burn. Cawthron Report 1950. Prepared for Environment Southland. 13 pages.
- Wood SA and Young RG 2011. Benthic cyanobacteria and toxin production in the Manawatu - Wanganui region. Cawthron Report 1959. Prepared for Horizons Regional Council. 34 pages plus appendices.
- Allen W, Fenemor A, Kilvington M, Harmsworth G, Young RG, Deans N, Horn C, Phillips C, Montes de Oca O, Ataria J and Smith R 2011. Building collaboration and learning in integrated catchment management: the importance of social process and multiple engagement approaches. New Zealand Journal of Marine and Freshwater Research. 45(3): 525-539.
- Olsen D, Maxwell I, Holmes R, Hay J, Allen C, Doehring KAM, Hayes JW and Young RG 2011. Assessment of the Amuri hydro project on the Waiau River, North Canterbury. Cawthron Report 2011. Prepared for Meridian Energy Ltd. 129 pages plus appendices.
- Maxwell I and Young RG 2011. Ruataniwha Plains water storage project: Aquatic ecology assessment of effects – inception report. Cawthron Report 2017. Prepared for Hawke's Bay Regional Council. 14 pages.
- Clapcott JE, Young RG, Goodwin E, Leathwick JR and Kelly D 2011. Relationships between multiple land-use pressures and individual and combined indicators of stream ecological integrity. Department of Conservation, Wellington. DOC Research and Development Series 326. 57 pages.
- Young RG and Clapcott JE 2010. Temporal variability in ecosystem metabolism of rivers in the Manawatu-Whanganui Region – Updated. Cawthron Report 1791. Prepared for Horizons Regional Council. 25 pages.
- Doehring KAM and Young RG 2010. Seasonal patterns in ecosystem metabolism of rivers in the Auckland Region 2003-2009. Cawthron Report 1795. Prepared for Auckland Regional Council. 23 pages.
- Doehring KAM, Young RG and James T 2010. State of the environment report - river water quality in Tasman District 2010. Cawthron Report 1893. 165 pages plus appendices. Prepared for Tasman District Council.
- Doehring KAM, Young RG and James T 2010. Our freshwaters - river water quality 2010 . Our freshwaters - river water quality 2010. Summary Report .
- Young RG and Doehring KAM 2010. Relationship between low flow and dissolved oxygen in selected rivers and streams in the Wairarapa: Preliminary findings from 2009/10 summer monitoring. Cawthron Report 1865. 28 pages. Prepared for Greater Wellington Regional Council.
- Young RG and Clapcott JE 2010. Ecosystem Metabolism. In Collier KJ, Hamilton DP, Vant W & Howard-Williams C [eds.]. The Waters of the Waikato: Ecology of New Zealand's Longest River. Environment Waikato.
- Phillips CJ, Allen WJ, Fenemor AD, Bowden WB and Young RG 2010. Researching integrated catchment management - lessons for interdisciplinary science from the Motueka Catchment, New Zealand. Marine & Freshwater Research 61: 749-763.
- Young RG, Wilkinson J, Hay J and Hayes JW 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(1): 137-146.
- Clapcott JE, Young RG, Goodwin E and Leathwick JR 2010. Exploring the response of functional indicators of stream ecological integrity to land-use pressure gradients. Freshwater Biology 55 (10): 2181-2199.
- Dymond JR, Davie TJA, Fenemor AD, Ekanayake JC, Knight BR, Cole AO, Montes de Oca Munguia O, Allen WJ, Young RG, Basher LR, Dresser M and Batstone CJ 2010. Integrating environmental and socio-economic indicators of a linked catchment-coastal system using variable environmental intensity. Environmental Management 46(3): 484-493.
- Hay J, Young RG and Strickland RR 2009. Aquatic ecology: Mitigation and management options associated with water storage in the proposed Lee Reservoir. Cawthron Report 1701. Prepared for Tonkin & Taylor Ltd on behalf of Waimea Water Augmentation Committee. 58 pages.
- Clapcott JE and Young RG 2009. Spatial and temporal variation of functional indicators in Waikato Rivers. Cawthron Report 1693. Prepared for Environment Waikato. 24 pages.
- Doehring KAM, McIntosh AR and Young RG 2009. The distribution of native freshwater fish in the Nelson City Council Area. School of Biological Sciences research report. Prepared for Nelson City Council. 35 pages.
- Olsen DA and Young RG 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.
- Young RG and Collier KJ 2009. Contrasting responses to catchment modification among a range of functional and structural indicators of river ecosystem health. Freshwater Biology 54(10): 2155-2170.
- Clapcott JE, Young RG, Goodwin E and Leathwick J 2009. Exploring the response of functional indicators of stream ecological integrity to land-use pressure gradients. Cawthron Report 1611. Prepared for Department of Conservation. 38 pages.
- Young RG and Clapcott JE 2009. Sediment effects on in-stream values workshop report. Cawthron Report 1661. Prepared for Hawkes Bay Regional Council. 7 pages.
- Collier KJ, Clapcott JE and Young RG 2009. Influence of human pressures on large river structure and function. Contract Report 95. Prepared for Department of Conservation. Centre for Biodiversity and Ecology Research, University of Waikato. 38 pages.
- Young RG, Matthaei CD and Townsend CR 2008. Organic matter breakdown and ecosystem metabolism: functional indicators for assessing river ecosystem health. Journal of the North American Benthological Society 27(3): 605-625.
- Fenemor A, Deans N, Davie T, Allen W, Dymond J, Kilvington M, Phillips C, Basher L, Gillespie PA, Young RG, Sinner J, Harmsworth G, Atkinson M and Smith R 2008. Collaboration and modelling - Tools for integration in the Motueka catchment, New Zealand. Water Sa 34(4): 448-455 .
- Young RG 2007. Instream flow requirements in the Riwaka River and implications for frost fighting. Cawthron Report 1337. Prepared for Tasman District Council. 11 pages.
- Young RG 2007. A trial of wood decomposition rates as an ecological assessment tool in large rivers. Cawthron Report 1339. Prepared for West Coast Regional Council. 6 pages.
- Hay J and Young RG 2007. Instream habitat modelling and its application in the Motueka Catchment. Cawthron Report 1073. Prepared for Integrated Catchment Management for the Motueka River. 54 pages.
- Young RG and Hay J 2006. Flow management in Marlborough's small streams. Cawthron Report 1173. Prepared for Marlborough District Council. 24 pages.
- Young RG 2006. A framework for flow management in the Takaka River catchment. Cawthron Report 1172. Prepared for Tasman District Council. 21 pages.
- Young RG 2006. Seasonal patterns in ecosystem metabolism in five Auckland rivers. Cawthron Report 1226. Prepared for Auckland Regional Council. 14 pages.
- Young RG 2006. Dissolved oxygen changes and ecosystem metabolism in the Motupipi catchment - Implications for river health assessment. Cawthron Report 1235. Prepared for Tasman District Council. 16 pages plus appendices.
- Hay J, Hayes JW and Young RG 2006. Water quality guidelines to protect trout fishery values. Cawthron Report 1205. Prepared for Horizons Regional Council. 17 pages.
- Young RG, Matthaei CD and Townsend CR 2006. Functional indicators of river ecosystem health - final project report. Cawthron Report 1174. Prepared for Ministry for the Environment. Sustainable management fund contract 2208. 38 pages.
- Young RG 2006. Functional indicators of river ecosystem health – results from regional case studies of leaf decomposition. Cawthron Report No. 1054. 35 pages.
- Young RG and Collier K 2006. Spatial variation in functional indicators for non-wadeable streams. Cawthron Report 1171. Prepared for Environment Waikato. 15 pages.
- Hay J, Young RG and Strickland RR 2006. Issues and mitigation options associated with water storage in the Lee River. Cawthron Report 1223. Prepared for Waimea Water Augmentation Committee. 22 pages.
- Hay J and Young RG 2005. Instream habitat flow analysis for the Waimea River and provisional minimum flows for proposed dam sites in the Upper Wairoa and Lee catchments. Cawthron Report 1061. Prepared for Waimea Water Augmentation Committee. 24 pages plus appendices.
- Young RG and Jowett IG 2005. Observations and modelling of Seston transport in the Waitaki River downstream of the Waitaki Dam. Cawthron Report 1030. Prepared for Meridian Energy Limited. 15 pages.
- Young RG, Crowe ALM and Thelin H 2005. Review of Marlborough District Council's surface water quality monitoring programme. Cawthron Report No. 1001. 35 pages.
- Young RG, Quarterman A, Eyles RF, Smith RA and Bowden WB 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.
- Hay J and Young RG 2005. Review of biological data relating to the Waimea River catchment. Cawthron Report 996. Prepared for Waimea Water Augmentation Committee. 40 pages.
- Crowe A and Young RG 2005. Sharland and Packer Creek study: Water chemistry and microbiology. Cawthron Report 1048. Prepared for Nelson City Council. 28 pages.
- Young RG, James T and Hay J 2005. State of surface water quality in Tasman District June 2005. Cawthron Report 933. Prepared for Tasman District Council. 69 pages plus appendices.
- Young RG, Townsend CR and Matthaei CD 2004. Functional indicators of river ecosystem health - an interim guide for use in New Zealand. Cawthron Report 870. Prepared for Ministry for the Environment. 54 pages.
- Young RG, Smart GM and Harding JS 2004. Impacts of hydro-dams, irrigation schemes and river control works. Pp. 37.1- 37.16. In Harding JS, Mosely MP, Pearson C, Sorrell B. (eds.) Freshwaters of New Zealand. New Zealand Hydrological Society and New Zealand Limnological Society.
- Davies-Colley RJ, Nagels JW, Smith RA, Young RG and Phillips CJ 2004. Water quality impact of a dairy cow herd crossing a stream. New Zealand Journal of Marine and Freshwater Research 38(4): 569-576.
- Young RG, Keeley N, Shearer KA and Crowe ALM 2004. Impacts of diquat herbicide and mechanical excavation on spring fed drains in Marlborough. Science for Conservation 240. Department of Conservation, Wellington. 50 pages.
- Young RG and Hayes JW 2004. Angling pressure and trout catchability: Behavioural observations of brown trout in two New Zealand backcountry rivers. North American Journal of Fisheries Management 24: 1203-1213.
- Hughes NF, Hayes JW, Shearer KA and Young RG 2003. Testing a model of drift-feeding using a 3D videography of wild brown trout in a New Zealand river. Canadian Journal of Fisheries and Aquatic Sciences 60: 1462-1476.
- Shearer KA, Stark JD, Hayes JW and Young RG 2003. Relationships between drifting and benthic invertebrates in three New Zealand rivers: implications for drift-feeding fish. New Zealand Journal of Marine and Freshwater Research 37: 809-820.
- Young RG, Crowe ALM and Strickland R 2002. Ecological assessments of spring-fed streams on the Wairau Plain. Cawthron Report 737. Prepared for Marlborough District Council. 32 pages plus appendices .
- Huryn AD, Riley RH, Young RG, Peacock K and Arbuckle CJ 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 RG, Hong T and White P 2001. Cobb power scheme 2001 resource consent renewal: Takaka River drying. Cawthron Report 635. Prepared for Natural Gas Corporation. 38 pages plus appendices.
- Young RG 2001. Water quality of the Rai River. Cawthron Report 626. Prepared for Marlborough District Council. 10 pages.
- Hayes JW and Young RG 2001. Effects of low flow on trout and salmon in relation to the Regional Water Plan: Otago. Cawthron Report 615. Prepared for Fish and Game New Zealand. 27 pages.
- Young RG and Hayes JW 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.
- Young RG, Strickland R, Harding J, Stark J and Hayes JW 2000. The ecology of Spring Creek - Awarua (Awarua: water from the ground). Cawthron Report 611. Prepared for Marlborough District Council and Fish & Game NZ - Nelson/Marlborough Region. 52 pages plus 7 appendices.
- Young RG, Harding JS, Strickland RR, Stark JD, Shearer KA and Hayes JW 2000. Cobb power scheme resource consent renewal 2000/2001: Water quality, aquatic habitat and fisheries. Cawthron Report 554. Prepared for TransAlta New Zealand Ltd. 131 pages plus appendices.
- Young RG 1999. Catch and release: A review of overseas research and implications for New Zealand. Cawthron Report 523. Prepared for Fish & Game New Zealand. 8 pages.
- Young RG and Hayes JW 1999. Trout energetics and effects of agricultural land use on the Pomohaka trout fishery. Cawthron Report 455. Prepared for Fish & Game New Zealand. 29 pages.
- Harding JS, Young RG and others 1999. Changes in agricultural intensity and river health along a river continuum. Freshwater Biology 42(2): 345-357.
- Young RG and Huryn AD 1999. Effects of land use on stream metabolism and organic matter turnover. Ecological Applications 9: 1359-1376.
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+64 3 548 2319 ext 273
roger.young@cawthron.org.nz