Population estimates and conservation of the New Zealand dotterel (Charadrius obscurus) on Great Barrier Island, New Zealand
|Title||Population estimates and conservation of the New Zealand dotterel (Charadrius obscurus) on Great Barrier Island, New Zealand|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Ogden, J, Dowding, JE|
|Type of Article||Full article|
|Keywords||Awana Beach, Charadrius obscurus aquilonius, conservation management, Great Barrier Island, movement patterns, Northern New Zealand dotterel, Whangapoua|
We present the first detailed data on the Great Barrier Island (GBI) subpopulation of the northern New Zealand dotterel (NNZD; Charadrius obscurus aquilonius). The breeding season population has averaged 48 birds (range: 41– 64) since 2000. At Awana on GBI, productivity has averaged >1.0 fledged chick per pair-year. The apparent survivorship of adult birds was less than that in the North Auckland subpopulation. After breeding, most GBI birds congregated at Whangapoua Estuary/Okiwi Spit in the north of the island, making this a site of international importance under the Ramsar Convention (1971). The post-breeding population of c.56 birds (range: 41 – 77) was augmented by local juveniles and input from elsewhere. Banding returns provided evidence of movement between GBI and the adjacent mainland subpopulation on the Coromandel Peninsula. There was no evidence that fewer predatory mammal species on GBI benefits the species at present. Conservation emphasis should focus on controlling mammalian predators and managing human impacts at breeding sites, especially early in the breeding season.