Ecosystem connectivity: tracking biochemical fluxes to inform ecosystem based management
We traced the fate of water and sediments from land through coastal food webs, evaluating connections between coastal and deep sea habitats, and identified the effects of key coastal developments (for example, aquaculture) on food web connectivity.
Project leader: Steve Wing, University of Otago
Duration: April 2016 – June 2019
Effective restoration and recovery of Aotearoa New Zealand’s coastal ecosystems relies on accurate information about their function and the influence of human activities. Our research will help guide effective decision-making by providing information on the connections that are vital for productive, healthy ecosystems.
Our team used advanced forensic chemistry to understand ecosystem connectivity. We traced movement of organic matter, nutrients, metals and contaminants through marine food webs and investigated how they are processed and channelled. Changes in these biochemical fluxes can shape ecological function and the provision of ecosystem services.
We focused on three systems where human activities have changed, and are continuing to change ecological function:
- Coastal and offshore fisheries – we studied the effects of environmental change and removal of marine resources on the food web structure of coastal and offshore fisheries from pre-industrial to present times.
- Shellfish survival – we studied how changes in land-use have influenced uptake of organic matter and contaminants by bivalve populations (including cockles, mussels, scallops and horse mussels).
- Commercial fish farms – we studied how waste materials from salmon farming operations are taken up and processed by natural food webs.
Udy JA et al (2019) Regional differences in supply of organic matter from kelp forests drive trophodynamics of temperate reef fish. Marine Ecology Progress Series 621: 19-32 doi.org/10.3354/meps12974
Udy JA, et al (2019) Organic matter derived from kelp supports a large proportion of biomass in temperate rocky reef fish communities: implications for ecosystem-based management.Aquatic Conservation: Marine and Freshwater Ecosystems 2019: 1-17 doi/full/10.1002/aqc.3101
Udy JA et al (2019) Regional differences in kelp forest interaction chains are influenced by both diffuse and localized stressors. Ecosphere 10(10), article e02894
'Seaworthy' scientists outrun ex-Cyclone Gita as they flee Sounds, Stuff Professor Steve Wing from Otago University and the team working on ecosystem connectivity were in the news during Cyclone Gita
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