Experimental field data from a 12-month manipulation of sea urchin herbivory and nutrient levels on temperate reefs in Port Phillip Bay, Australia. The study, likely from the Australian Ocean Data Network, estimates tipping points for the collapse and recovery of kelp beds. It found that densities of 8 or more urchins per square meter lead to complete overgrazing, while recovery occurred at densities of 4 or fewer urchins per square meter.
Use Cases
- Modeling tipping points for kelp bed collapse based on experimentally derived sea urchin density thresholds.
- Analyzing the interaction between top-down (herbivory) and bottom-up (nutrient) drivers of ecosystem structure.
- Comparing the resilience of kelp beds to overgrazing under different nutrient conditions.
- Calibrating population dynamics models for sea urchins and macroalgae in temperate reef ecosystems.
Strengths
- Experimentally derived thresholds: 8 urchins m⁻² for collapse and ≤4 urchins m⁻² for recovery.
- Explicit biomass estimates provided: ≥427 g m⁻² and ≤213 g m⁻² for the respective density thresholds.
- Study duration of 12 months provides data on seasonal dynamics.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Data may reflect geographic bias inherent to the single study location in Port Phillip Bay.
Provenance
- Source
- Australian Ocean Data Network
- Collection Method
- Field experiment involving manipulation of sea urchin densities and nutrient levels on experimental reefs.
- Time Range
- Study conducted over 12 months; specific years not stated.
- Freshness
- Last updated 2026-04-29 10:14:08.243108; freshness should be verified.
- Geography
- Port Phillip Bay, Australia.