Double-brooding and brood overlap by Northern New Zealand Dotterels ( Charadrius obscurus aquilonius )
|Title||Double-brooding and brood overlap by Northern New Zealand Dotterels ( Charadrius obscurus aquilonius )|
|Publication Type||Journal Article|
|Year of Publication||1999|
|Authors||Dowding, JE, Wills, DE, Booth, AM|
|Type of Article||paper|
|Keywords||breeding system, brood overlap, Charadrius obscurus, double-brooding, New Zealand Dotterel, plover|
Double-brooding has not previously been recorded in the New Zealand Dotterel (Charadrius obscurus). Since 1994, we have recorded five definite cases of double- brooding in which both birds of the pair were colour-banded, two cases where banded females had unbanded mates, and several probable cases involving unbanded birds. In the five cases in which pairs were banded, females always re-nested with the same mate (monogamous double-brooding). We recorded one definite and one probable case of brood-overlap; in some other cases there was definitely no overlap. Predation, timing of laying, and individual variation are some of the factors that may determine whether double-brooding occurs in the New Zealand Dotterel.