Breeding of brown teal ( Anas chlorotis ) at Okiwi, Great Barrier Island
|Title||Breeding of brown teal ( Anas chlorotis ) at Okiwi, Great Barrier Island|
|Publication Type||Journal Article|
|Year of Publication||2002|
|Authors||Barker, D, Williams, M|
|Type of Article||paper|
|Keywords||Anas chlorotis, breeding, brown teal, Great Barrier Island, New Zealand, productivity|
Breeding performance of brown teal (Anas chlorotis) nesting in a pastoral environment at Okiwi, Great Barrier Island, New Zealand was studied during 1997-99. Mean (SD) clutch size in 47 nests was 5.4 (0.9), eggs hatched in 74% of nests (n=50), and 66% of eggs (n=236) hatched. Of 31 females fitted with radio transmitters, the nesting attempt by 7 (23%) was not detected and the remainder fledged a total of 15 young, a mean (+SD) annual productivity of 0.5 (1.3) fledglings female-1. Most broods (72% n=32) became extinct within 10 days of hatching. Limited wetland habitat in the pastoral landscape concentrated nesting and brood rearing. Breeding statistics from this environment may not be representative of the wider population.