Restoration Objective:

Evaluate sea urchin removal as a tool for restoration.

Site Selection Criteria:

2.0 ha area. Large, discrete area (e.g. bays, bounded by sand or narrow margins) to restrict sea urchin ingress. One of four sites chosen across the Hauraki Gulf with varying environmental conditions. Sea urchins removed in Feb 2021.

Cause Of Decline:

Overharvest of sea urchin predators

Key Reasons For Decline:

Overgrazing

Scientific Paper

Large-scale one-off sea urchin removal promotes rapid kelp recovery in urchin barrens

Restoration ecology.

https://doi.org/10.1111/rec.14060

Organisation:

University of Auckland

Site Observations:

Observation Date

4th Feb 2021 – 4th Feb 2023

Action Summary:

One off sea urchin removal

Lessons Learned:

A one off urchin removal can facilitate kelp recovery

Project Outcomes:

Kelp recovered

Scientific Paper:

Restoration Ecology.

https://doi.org/10.1111/rec.14060

Area of Restoration (Ha)

2

Indicator Data:

Indicator:	Ending Value:	Starting Value:
Adult Kelp Density	51.3795 / m²	4.8039 / m²

Observation Date

2nd Apr 2021 – 4th Feb 2023

Action Summary:

Counted snapper

Lessons Learned:

One off removal can facilitate kelp recovery

Project Outcomes:

Kelp recovered, some snapper recovery

Indicator Data:

Indicator:	Ending Value:	Starting Value:
Fish Count	14.0000	0.0000

Observation Date

2nd Feb 2021 – 2nd Apr 2023

Action Summary:

Counted lobster

Lessons Learned:

A one off removal can facilitate kelp recovery

Project Outcomes:

Increased in

Indicator Data:

Indicator:	Ending Value:	Starting Value:
Lobster Count	2.0000	0.0000

University of Auckland - Otata Island (Noises)

University of Auckland - Otata Island (Noises)

Restoration Project

University of Auckland - Otata Island (Noises)

Restoration Objective:

Site Selection Criteria:

Cause Of Decline:

Overgrazing

Large-scale one-off sea urchin removal promotes rapid kelp recovery in urchin barrens

Organisation:

University of Auckland

Site Observations:

4th Feb 2021 – 4th Feb 2023

Action Summary:

Lessons Learned:

Project Outcomes:

Scientific Paper:

2

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Adult Kelp Density

1. Engages Stakeholders

2. Draws On Many Types Of Knowledge

3. Is Informed By Native Reference Ecosystems, While Considering Environmental Change

4. Supports Ecosystem Recovery Processes

5. Is Assessed Against Clear Goals And Objectives, Using Measurable Indicators

6. Seeks The Highest Level Of Ecosystem Recovery Possible

7. Gains Cumulative Value When Applied At Large Scales

8. Is Part Of A Continuum Of Restorative Activities

2nd Apr 2021 – 4th Feb 2023

Action Summary:

Lessons Learned:

Project Outcomes:

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Fish Count

2nd Feb 2021 – 2nd Apr 2023

Action Summary:

Lessons Learned:

Project Outcomes:

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Lobster Count