Critical Step 1.1.5: Accounting for food web dynamics in models to predict management outcomes

Project team:

Lead: Kevin Collier

Moritz Lehmann, Ian Duggan, Brendan Hicks


Project description:

This project aims to develop quantitative measures of biological processes that can inform models of lake water quality. The focus has been on measuring nutrient excretion rates of fish and freshwater mussels, with work planned on grazing rates of zooplankton. Work has been conducted using the model PCLake to incorporate fish excretion and bioturbation rates into predictions of lake restoration scenarios.


Links to other critical steps:

The models will be informed by work on selected study lakes where we investigate multiple stressor interactions (CS1.1.4), food-web dynamics (CS 1.2.3), and new data technologies (CS1.2.1 and 1.2.2).


Current work:

  • We are presently writing up model scenarios on a Waikato lake and fish excretion rate data.


Key sites:

All NZ lakes


Outputs:

Journal Publications

  • Collier KJ, Clearwater S, Nejenhuis P, Wood S 2018. Factors affecting biodeposition in the New Zealand freshwater mussel Echyridella menziesiiNew Zealand Journal of Marine and Freshwater Research 52: 1-15.

  • Stewart SD, Hamilton DP, Baisden WT, Verburg P. 2018. The role of mobile consumers in lake nutrient cycles: a brief review. Hydrobiologia 818: 11-29.

  • Cyr H, Collier KJ, Clearwater SJ, Hicks BJ, Stewart S. 2016. Feeding and nutrient excretion of the New Zealand freshwater mussel Echyridella menziesii (Hyriidae, Unionida):Implications for nearshore nutrient budgets in lakes and reservoirs. Aquatic Sciences 79: 557-571.

Conference Presentations

  • Collier KJ, Garrett-Walker J, Ozkundaci D, Pingram M. 2017. Quantifying basal trophic resources for shallow lake food webs. Oral presentation, 5th Biennial Symposium of the International Society for River Science: Integrating Multiple Aquatic Values. Hamilton, New Zealand. 19-24 November 2017.

  • Pingram M, Collier KJ, Garrett-Walker J, Melchior M, Ozkundakci D. 2017. Quantifying trophic interactions in shallow lake food webs using stable isotopes of carbon and nitrogen. Oral presentation, 5th Biennial Symposium of the International Society for River Science: Integrating Multiple Aquatic Values. Hamilton, New Zealand. 19-24 November 2017.

  • Stewart S, Hamilton D, Baisden WT, Verburg P. 2017. Seasonal variations in consumer nitrogen recycling in an oligotrophic lake: a stable isotope study. Oral presentation, 5th Biennial Symposium of the International Society for River Science: Integrating Multiple Aquatic Values. Hamilton, New Zealand. 19-24 November 2017.

  • Collier KJ, Cyr H, Clearwater SJ, Hicks BJ, Neijenhuis, Stewart SD, Wood SA. 2016. Implications of biodeposition by freshwater mussels for lake resilience. Joint conference of The Society for Ecological Restoration Australasia (SERA) & The New Zealand Ecological Society, 19-23 November, Hamilton, New Zealand.