Freshwater biosecurity - publications

These are some recent publications related to the Freshwater Biosecurity programme.


Alahuhta, J., (and 40 co-authors including de Winton, M). 2017. Global variation in the beta diversity of lake macrophytes is driven by environmental heterogeneity rather than latitude. Journal of Biogeography. (in press).

Hussner, A., Stiers, I., Verhofstadd, M.J.J.M., Bakker, E.S., Grutters, B.M.C., Haury, J., van Valkenburg, J.L.C.H., Brundu, G., Newman, J. Clayton, J.S., Anderson, L.W.J., Hofstra, D. 2017. Management and control methods of invasive alien freshwater aquatic plants: A review. Aquatic Botany, 136: 112–137.


Bray, J., Harding, J.S., Kilroy, C., Broady, P., Gerbeaux, P. 2016. Physicochemical predictors of the invasive diatom Didymosphenia geminata at multiple spatial scales in New Zealand rivers. Aquatic Ecology, 50(1): 1-14.

Gerbeaux, P., Champion, P., Dunn, N. 2016. Conservation of freshwaters. In, Jellyman, P.G., Davie, T.J.A., Pearson, C.P., Harding, J.S. (Eds), Advances in freshwater research. New Zealand Freshwater Sciences Society & New Zealand Hydrological Society.

Hofstra, D., de Winton, M. 2016. Geographic scales of genetic variation amongst Isoëtes in New Zealand. Aquatic Botany 131: 28–37.

Kilroy, C., Jellyman, P.G., Wood, S.A. 2016. Didymosphenia geminata: a new nuisance algal species in New Zealand fresh waters. Chapter 11 In: Advances in New Zealand freshwater science. (Eds P.G. Jellyman, T. Davie, C.P. Pearson, J.S. Harding). Publ. NZFSS/NZ Hydrological Society.

Kilroy, C., Larned, S. 2016. Contrasting effects of low-level phosphorus and nitrogen enrichment on growth of the mat-forming alga Didymosphenia geminata in an oligotrophic river. Freshwater Biology online DOI: 10.1111/fwb.12798

Leathwick, J., Collier, K.J., Hicks, B., Ling, N., Stichbury G., de Winton, M. 2016. Predictions of establishment risk highlight biosurveillance priorities for invasive fish in New Zealand lakes. Freshwater Biology, online. DOI: 10.1111/fwb.12791.

Redekop, P., Gross, E., Nuttens, A., Clayton, J., Hofstra, D., Hussner, A. 2016.  Hygraula nitens, the only native aquatic caterpillar in New Zealand prefers feeding on an alien submerged plant.  Hydrobiologia, DOI 10.1007/s10750-016-2709-7.

Redekop, P., Hofstra, D., Hussner, A. 2016.  Elodea canadensis shows a higher dispersal capacity via fragmentation than Egeria densa and Lagarosiphon major.  Aquatic Botany, 130:45–49 


Champion, P.D. 2015. Biosecurity management overview. Published proceedings of the Rotorua Lakes Symposium, 12-13 March, Rotorua, Lakes Water Quality Society: 169-182.

Gantz, C.A., Gordon, D.R., Jerde, C.L., Keller, R.P., Chadderton, W.L., Champion, P.D., Lodge, D.M. 2015. Managing the introduction and spread of non-native aquatic plants in the Laurentian Great Lakes: a regional risk assessment approach. Management of Biological Invasions, 6: 45–55.

Kilroy, C. 2015. Ten years of Didymosphenia geminata in New Zealand. Proceedings of the 16th International Conference on Harmful Algae, Wellington, New Zealand. 49-54.

Sorensen, P. W., Baker, C. 2015. Species-specific pheromones and their roles in shoaling, migration and reproduction: a review and synthesis. In: Sorensen, P & Wisenden, B. (Eds). Pheromones and Related Chemical Cues in Fishes. Wiley Press.


Champion, P.D., Clayton, J.S., de Winton, M.D. 2014. A risk assessment based proactive management strategy for aquatic weeds in New Zealand. Management of Biological Invasions, 5: 233-240.

Champion, P.D., Wells, R.D.S. 2014. Proactive management of aquatic weeds to protect the nationally important Northland dune lakes, New Zealand. Proceedings of 19th Australasian Weeds Conference, Hobart, Tasmania. 139-142.

Hofstra, D.E., Clayton, J.S. 2014. Native flora and fauna response to removal of the weed Hydrilla verticillata (L.f.) Royle in Lake Tutira. Hydrobiologia, DOI 10.1007/s10750-014-1865

Hussner, A., Hofstra, D., Jahns, P., Clayton, J. 2014.  Response capacity to CO2 depletion rather than temperature and light effects explain the growth success of three alien Hydrocharitaceae compared with native Myriophyllum triphyllum in New Zealand.  Aquatic Botany 120: 205-211.


de Lange, P.J., Rolfe, J.R., Champion, P.D., Courtney, S.P., Heenan, P.B., Barkla, J.W., Cameron, E.K., Norton, D.A., Hitchmough, R.A. 2013. Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series.

Hofstra, D.E., Champion, P.D., Dugdale, T.M., Fridman, M., Barker, R., Finlay, M. 2013. Comparison of use rates and treatment timing with glyphosate to control Mexican water lily. Journal of Aquatic Plant Management 51: 69–76.

Özkundakci, D., Hamilton, D.P., Kelly, D., Schallenberg, M., de Winton, M., Verburg, P., Trolle, D. 2013. Ecological integrity of deep lakes in New Zealand across anthropogenic pressure gradients. Ecological Indicators, 37:45–57.

Schallenberg, M., de Winton, M.D., Verburg, P., Kelly, D.J., Hamill, K.D., Hamilton, D.P. 2013. Ecosystem services of lakes. In Dymond JR ed. Ecosystem services in New Zealand–conditions and trends. Manaaki Whenua Press, Lincoln, New Zealand.

Stewart, M., Baker, C., Sorensen, P.W. 2013. Chemical Analysis of Aquatic Pheromones in Fish. In: Touhara, K. (ed.). Methods in Molecular Biology, pp. 23. Humana Press, 1068:55-69. doi: 10.1007/978-1-62703-619-1_5.


Broady, P.A., Flint, E.A., Nelson, W.A.,Cassie Cooper, V., de Winton, M.D., Novis, P.M. 2012. Chapter twenty-three: phyla chlorophyta and charophyta (green algae). In, Gordon, D. (Ed) Inventory of New Zealand Biodiversity Volume 3. Bacterial, Protistan, Plant and Fungal Kingdoms. Canterbury University Press.

Champion, P., Rowe, D., Smith, B., Wells, R., Kilroy, C., de Winton, M. 2012. Freshwater pests of New Zealand. 76 pp.

Champion, P.D., James, T.K., Popay, A.I., Ford, K. 2012. An illustrated guide to common grasses, sedges and rushes of New Zealand. New Zealand Plant Protection Society, Lincoln, Canterbury.

Compton, T.J., de Winton, M., Leathwick, J.R., Wadhwa, S. 2012. Predicting spread of invasive macrophytes in New Zealand lakes using indirect measures of human accessibility. Freshwater Biology, 57: 938–948. doi:10.1111/j.1365-2427.2012.02754.x

de Winton, M.D., Clayton, J.S., Edwards, T. 2012. Incorporating invasive weeds into a plant indicator method (LakeSPI) to assess lake ecological condition. Hydrobiologia, 691: 47-58.

Dugdale, T.M, Champion, P.D. 2012. Control of alligator weed with herbicides: A review. Plant Protection Quarterly 27: 70-82.

Gordon, D.R., Gantz, C.A., Jerde, C.L., Chadderton, W.L., Keller, R.P., Champion, P.D. 2012. Weed Risk Assessment for Aquatic Plants: Modification of a New Zealand System for the United States. PLoS ONE 7(7), doi:10.1371/journal.pone.0040031

Hamilton, D.P., McBride, C., Özkundakci, D., Schallenberg, M., Verburg, P., de Winton, M.D., Kelly, D., Hendy, C., Wei, Ye. 2013. Effects of climate change on New Zealand lakes. In Climatic Change and Global Warming of Inland Waters: Impacts and Mitigation for Ecosystems and Societies. Goldman, C.R., Kumagai, M., Robarts, R.D. (Eds). Wiley Blackwell.

Hofstra D.E., Clayton J.S. 2012. Assessment of Natural Products as Benthic Barriers for Submerged Aquatic Weed Control.  Journal of Aquatic Plant Management, 50: 101-105.

Hofstra, D., Rendle, D., Clayton, J. 2012. First record of the fungus Mycoleptodiscus terrestris from native milfoil and pondweed in New Zealand.  Australasian Mycologist, 30: 1-4.  

Hussner, A., Champion, P. 2012. Myriophyllum aquaticum (Vell.) Vercourt (parrot feather). Chapter 9 (pp.103-112) In: Francis, R.A. (Ed.) A Handbook of Global freshwater Invasive Species. Earthscan, Oxon. ISBN: 978-1-84971-228-6

Kelly, C.L., Hofstra, D.E., de Winton, M.D., Hamilton, D.P.  2012.  Charophyte germination response to herbicide application.  Journal of Aquatic Plant Management, 50: 150-154

Riis, T., Birgit Olesen, B., Clayton, J., Lambertini, C., Brix, H., Sorrell, B. 2012. Growth and morphology in relation to temperature and light availability during the establishment of three aquatic plant species. Aquatic Botany, 201: 56 – 64.


Bodmin, K. 2011. - native plants in aquaria. TV1 New -

Champion, P.D, James, T.K., Singers, N., Bodmin, K.A. 2011. Garlon® 360 trial for the control of wetland weeds. Science for Conservation 311. Department of Conservation, Wellington.

Clayton, J. 10th Dec 2011 - Exotic snail invasion alarms scientist. Waikato Times,

Clayton, J., 2011. Horrible Hornwort. TV1 Rural Delivery. 2011, Series 6, Episode 6. Screened 7 May 2011.

Clearwater, S.J., Jellyman, P.G., Biggs, B.J.F., Hickey, C.W., Blair, N., Clayton, J.S. 2011. Pulse-dose application of chelated copper to a river for Didymosphenia geminata control: effects on macroinvertebrates and fish. Environmental Toxicology & Chemistry, 30(1); 181-195. DOI: 10.1002/etc.369.

Hussner, A., Hofstra, D.,Jahns, P. 2011. Diurnal courses of net photosynthesis and photosystem II quantum efficiency of submerged Lagarosiphon major under natural light. Flora 26 (10), 6pp.

Jellyman, P.G., Clearwater, S.J., Clayton, J.S., Kilroy, C., Blair, N., Hickey, C.W., Biggs, B.J.F. 2011. Controlling the invasive alga Didymosphenia geminata: an ecotoxicity assessment of four potential biocides. Archives of Environmental Toxicology and Chemistry. : doi:10.1007/s00244-00010-09589-z.


Champion P., Hofstra D., Clayton, J. 2010. Nipping aquatic plant invasions in the bud – weed risk assessment and the trade. Hydrobiologia 656(1); 167-172.

Champion P.D., James T.K., Dawson, M.I. 2010. New names for New Zealand weeds. New Zealand Plant Protection 63: 72-77.

Champion, P.D., Clayton, J.S. 2010. Native macrophytes and aquatic weeds. Chapter 8 In, Collier, al., (Eds). Waters of the Waikato. Environment Waikato and University of Waikato Publication, Hamilton.

Champion, P.D., Clayton, J.S., Petroeschevsky A., Newfield, M. 2010. Using the New Zealand aquatic weed risk assessment model to manage potential weeds in the aquarium/pond plant trade. Plant Protection Quarterly 25(2): 49-51.

Champion, P.D., Hofstra, D.E. 2010. Manchurian wild rice (Zizania latifolia) control. Proceedings of the 17th Australasian Weeds Conference, Christchurch. pp 318-320.

Clayton, J., Matheson, F. 2010. Optimising diquat use of submerged aquatic weed management. Hydrobiologia, 656 (1); 159-165.

Hofstra, D., Champion, P. 2010. Herbicide trials for the control of alligatorweed. Journal of Aquatic Plant Management, 48; 79-83.

Hofstra D., Champion P., Clayton J. 2010. Predicting invasive success of Hydrilla verticillata (Lf) Royle in flowing water. Hydrobiologia, 656 (1); 213-219.

Jellyman, P.G., Clearwater, S.J., Clayton, J.S., Kilroy, C., Hickey, C.W., Blair, N., Biggs, B.J.F. 2010. Rapid screening of multiple compounds for control of the invasive diatom Didymosphenia geminata. Journal of Aquatic Plant Management, 48:63-71.

Lambertini, C., Riis, T., Olesen, B., Clayton, J., Sorrell, B., Brix, H. 2010. Genetic diversity in three invasive clonal aquatic species in New Zealand. BMC Genetics, 11:52. doi:10.1186/1471-2156-11-52.

Riis, T., Lambertini, C., Olesen, B., Clayton, J., Brix, H., Sorrell, B. 2010. Invasion strategies in clonal aquatic plants: are phenotypic differences caused by phenotypic plasticity or local adaptation? Annals of Botany, 106(5): 813–822. doi: 10.1093/aob/mcq176

Popay, A.I., Champion, P.D., James, T.K. 2010. An illustrated guide to common weeds of New Zealand. Third edition. New Zealand Plant Protection Society, Lincoln, Canterbury.


Champion, P., Clayton, J. 2009. Biocontrol in aquatic plants. Protect magazine, Spring, 21-23.

Hofstra D. E., Edwards T., Clayton, J.S., Shearer J. F. 2009. New record of fungus Mycoleptodiscus terrestris from New Zealand. New Zealand Journal of Botany, 47; 411-415.