Firth of Thames

IBA Criteria

Year of most recent IBA criteria assessment: 2014

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Australasian Bittern Botaurus poiciloptilus EN resident - present A1
Haematopus ostralegus NR non-breeding 2009-2012 9,446-14,332 individuals A1
Wrybill Anarhynchus frontalis VU non-breeding 2009-2012 2,053-2,253 individuals A1, A4i
Black-billed Gull Larus bulleri EN breeding 1963-2013 85-320 breeding pairs A1
A4iii Species group - waterbirds n/a - - 20,000-25,000 individuals A4iii

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Orongo Stewardship Area 28 protected area contained by site 0
Miranda Taramaire Government Purpose Reserve 81 protected area overlaps with site 0
Miranda Stream Stewardship Area 2 protected area contained by site 0
Miranda Stewardship Area 4 protected area contained by site 0


IUCN Habitat Habitat detail Extent (% of site)
Marine Intertidal -
Marine Coastal/Supratidal -
Introduced vegetation -
Shrubland -
Forest -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Firth of Thames. Downloaded from on 28/02/2020.