Sunday, November 28, 2021

Population numbers of the Caspian tern (Sterna caspia) in New Zealand

TitlePopulation numbers of the Caspian tern (Sterna caspia) in New Zealand
Publication TypeJournal Article
Year of Publication2008
AuthorsBell, M, Bell, BD
Type of Articlearticle
Keywordsbreeding pairs, Caspian Tern, colonies, New Zealand, population trend, Sterna caspia, survey

During 1971-75 and 1991-95, surveys of Caspian tern (Sterna caspia) colonies throughout New Zealand were carried out. The breeding population in 1971-75 was 1266 pairs, in 16 colonies, predominately in the northern North Is. In 1991-95, there were 1190 breeding pairs found in 17 mainly northern colonies, suggesting the population had been relatively stable over the 20-year period. As census methodology may under-record the breeding of isolated pairs, we included an estimate of the number of isolated pairs to give a total national population of 1300-1400 breeding pairs. This is less than 3% of the global population. Colony size and location showed some change between survey periods; 6 colonies disappeared and 8 new colonies were formed. Addition surveys in 2011-2015 are recommended to compare recent population trends.

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