Overcoming Shifting Baselines: Paleo-Behaviour Reveals Industrial Revolution as Tipping Point

Area of Science:

• Marine Ecology
• Paleoceanography
• Fisheries Science

Background:

• Human activities have extensively modified global coastal ecosystems.
• Shifting baselines syndrome (SBS) obscures the full extent of human impacts on these environments.
• Understanding long-term ecological changes is crucial for effective conservation.

Purpose of the Study:

• To investigate the 800-year ecological impacts of human activities on New Zealand's coastal ecosystems.
• To address the shifting baselines syndrome (SBS) by comparing historical and current fish behavior.
• To inform conservation and habitat restoration strategies for coastal biodiversity.

Main Methods:

• Utilized fish otolith microchemical profiling to reconstruct historical fish movements.
• Applied dynamic time warping analysis across an entire fish stock unit.
• Compared current coastal fish movement profiles with historical baselines.

Main Results:

• Documented a significant shift in snapper (Chrysophrys auratus) habitat-use behavior over 800 years.
• Observed a transition from low-salinity estuarine to higher-salinity habitats, linked to land-use changes.
• Identified New Zealand's Industrial Revolution as a tipping point for ecosystem transformation.

Conclusions:

• The study provides evidence to address shifting baselines syndrome (SBS) in coastal ecosystems.
• Restoring pre-industrial habitat-use behaviors in snapper indicates successful ecosystem restoration.
• Findings support enhanced habitat restoration, sustainable management, and coastal biodiversity conservation.