Saturday, November 28, 2020

Breeding biology of morepork (Ninox novaeseelandiae) on Mokoia Island, Lake Rotorua, New Zealand.

TitleBreeding biology of morepork (Ninox novaeseelandiae) on Mokoia Island, Lake Rotorua, New Zealand.
Publication TypeJournal Article
Year of Publication2006
AuthorsStephenson, BM, Minot, EO
JournalNotornis
Volume53
Issue3
Pagination308-315
Type of Articlearticle
Keywordsbreeding biology, juvenile dispersal, morepork, Ninox novaeseelandiae, Owl, reproductive success
Abstract

We studied the New Zealand morepork (Ninox novaeseelandiae) over 2 breeding seasons on Mokoia I, Lake Rotorua, North Island, New Zealand. Ten pairs were monitored in the 1995/96 breeding season and 8 in the 1996/97 season. Nest sites included tree cavities, hollows amongst tree fern fronds, nest boxes provided for saddleback (Philesturnus carunculatus) and scrapes on the groung. Nest cavities were 0-5.2 m agl. Clutch size was 1-3 eggs; egg dimensions averaged 39.0 mm × 32.9 mm. The incubation period for 1 clutch was at least 24 days. Only females were observed to incubate eggs and brood nestlings; males roosted nearby. Two chicks were weighed and measured throughout their development and the nestling period was determined for 1 chick. Nestling development is described. Breeding success was lower in the year after a poisoning operation to eradicate mice from the island. Juvenile mortality was high after fledging. The dispersal of 3 juveniles was monitored, and females appeared to move earlier and disperse farther than males.

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