Caspian Tern.  Photo: Nick Dunlop

As global temperatures rise there would be a general expectation that the ranges of tropical seabird species would extend further in the higher latitudes whilst cold water species would retreat towards the poles. There is already clear evidence that this process is underway in a number of marine regions around the world.

The Bridled Tern has established 40-50 new colonies on islands and stacks all around the south-west coast to the Recherche Archipelago, arguably the longest-range shift observed in any seabird to date*.

Caspian Tern.  Photo: Nick Dunlop

Reference:

  • Dunlop, J.N (2017) Sentinel Seabirds: A Guide to Using Marine Birds to monitor Marine Ecosystems. Northern Agricultural Catchment Council Geraldton