Defining rocky reef tipping points associated with the Kaikōura earthquake
We are investigating the recovery and resilience of kelp forests associated with the 2016 Kaikōura earthquake.
Project leader: Leigh Tait, NIWA
Duration: July 2017 – June 2019
The uplift of Kaikōura’s coastline following the November 2016 earthquakes caused an unprecedented loss of kelp forests, which provide many important ecoystem services.
We are investigating how the loss of kelp has modified the coastal environment. Kelp are a dominant species with several important roles: they fix carbon, provide habitat and food for sea creatures including taonga species like paua, buffer wave disturbance and increase dissolved oxygen. Loss of kelp has greatly reduced these ecological services along the Kaikōura coast.
We are using gradients of kelp loss to understand the alteration of ecosystem services across the Kaikōura coast. The magnitude of kelp loss across coast-wide gradients of turbidity will also inform us about the critical needs for kelp forests to survive, sustain ecosystem services and maintain biodiversity. We are assessing:
- wide-scale kelp bed survival using drone images
- changes in ecosystem services
- small-scale recovery of kelp species.
We have found that areas with significant kelp loss are vulnerable to suspended sediments because it reduces the light available for the plants to thrive. Pre-earthquake sediment levels had already restricted kelp to shallow waters. Post-earthquake the additional sediment associated with landslips may compromise recovery where ecological services are diminished.
Our research is providing a whole-coast assessment of potential kelp loss and identify critical tipping points that have caused a loss of ecosystem services. This will inform sustainable management of kelp forests in the region by highlighting areas where recovery is likely, unlikely or may require intervention.
- A visual summary of the research with aerial views of the Kaikōura coastline showing the impacts of coastal uplift on seaweed.
- Using drones to monitor marine ecosystems, Thurs 6 June 2019, hosted via Zoom video conferencing.
- Schiel DR, Alestra T, Gerrity S, Orchard S, Dunmore R, Pirker J, Lilley S, Tait L, Hickford M & Thomsen M (2019) The Kaikōura earthquake in southern New Zealand: Loss of connectivity of marine communities and the necessity of a cross‐ecosystem perspective. Aquatic Conservation: Marine and Freshwater Ecosystems. 2019: 1-15 https://doi.org/10.1002/aqc.3122
- Schiel DR, Gerrity S, Alestra T, Pirker J, Marsden I, Dunmore R, Tait L, South P, Taylor D and Thomsen M (2018). Kaikōura earthquake: Summary of impacts and changes in nearshore marine communities. In Henlass C, Borrero J, Neale D and Shand T (eds) Shakey Shores- Coastal impacts & responses to the 2016 Kaikōura earthquakes. New Zealand Coastal Society, Special Publication 2, 2018, 44pp.
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Last week (3–5 March), schoolchildren from across New Zealand travelled with LEARNZ and the Sustainable Seas Challenge to discover what's threatening mussels/kuku or kūtai, a taonga species, in Ōhiwa Harbour, and how science and mātauranga Māori are being combined by local kaitiaki to understand – and address – the problem.