Half of Seabirds Are Declining. Protecting Marine Flyways Could Help Save Them

Why It Matters

Coordinated conservation across jurisdictions can reverse seabird declines, help meet international biodiversity targets, and leverage existing policy frameworks and protected‑area networks.

Key Takeaways

• Six marine flyways span Atlantic, Pacific, Indian, Southern oceans
• 151 seabird species rely on these routes; 42% are threatened
• Flyways intersect EEZs of 54 nations, enabling policy alignment
• Bycatch, invasive mammals, and climate change are top threats
• Formal flyway recognition could unify funding and enforcement mechanisms

Pulse Analysis

Seabird populations have been slipping for decades, but the underlying cause often lies beyond any single nation’s borders. Migratory birds stitch together breeding islands, feeding grounds, and stop‑over sites that sit in a patchwork of national jurisdictions. When protection stops at political lines, critical links in the life‑cycle break, leading to cascading declines. The marine‑flyway concept, long used for waterbirds on land, offers a framework to view these oceanic highways as ecological corridors that demand shared stewardship.

The recent analysis by BirdLife International and partners identified six distinct marine flyways that thread through the Atlantic, Pacific, Indian and Southern oceans. By integrating satellite tracking data for 151 seabird species, the researchers showed that 42% of these birds are already classified as globally threatened. The flyways overlap the Exclusive Economic Zones of 54 countries, providing a ready‑made platform for policy alignment. Existing networks of more than 1,300 Key Biodiversity Areas sit along these routes, but coverage is uneven, and many species lack any formally protected sites. The study also maps the spatial distribution of three primary threats—bycatch in longline fisheries, invasive mammals on nesting islands, and climate‑driven shifts in food availability—highlighting hotspots where coordinated action could yield the greatest gains.

Turning the flyway concept into a binding conservation tool could reshape ocean governance. Formal recognition under the Convention on Migratory Species would allow governments, fisheries bodies, and NGOs to pool resources, harmonize monitoring, and implement mitigation measures—such as bycatch reduction devices and island eradication programs—across the full migratory circuit. While data gaps remain, especially for juvenile stages, the framework provides a pragmatic starting point for multinational agreements, funding mechanisms, and adaptive management plans. If embraced, marine flyways could become the connective tissue that links site‑based protection into a resilient, global network for seabirds.