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Breeding of the banded dotterel, Charadrius bicinctus, on the Cass River Delta, Canterbury

Notornis, 35 (1), 9-14

M. Bomford (1988)

Article Type: Paper

Laying began in August, peaked in late September to early October and finished in December. Eggs were laid at intervals of three days to a normal clutch of three. The site and dimensions of 47 nests are described. The female did 82% of daytime incubating, and incubation averaged 26.5 days. Most eggs were lost to predators and only 44% hatched. In fine weather chicks made trips away from the nest within a few hours of hatching. Once hatching was completed the nest was deserted, but parents and chicks stayed in the territory until the chicks fledged at 5-6 weeks. Post-breeding flocks contained 23% juveniles.

Foraging by Adélie penguins during the incubation period

Notornis, 35 (1), 15-23

L.S. Davis; G.D. Ward; R.M.F.S. Sadleir (1988)

Article Type: Paper

Nine Adelie penguins (Pygoscelis adeliae), 4 females and 5 males, were tracked by radio telemetry when they went to sea from the Northern Rookery, Cape Bird, Antarctica, on their first foraging trips of the incubation period. Each penguin took a different direction on leaving the rookery but maintained its approximate heading, suggesting that it was navigating. Radio contact was lost after 2-12 days as birds moved beyond the 100 km radio horizon. The penguins spent about one-third of their time on ice floes. Most of their time in the water was spent diving and feeding. Dives (including underwater swimming) lasted for a mean of 92.5 s, followed by a mean recovery period of 33.8 s. The length of the recovery period was significantly correlated with the length of the dive. From the maximum dive times, the duration of “feeding” dives, and the dive: pause ratios, Adelie penguins seem to have diving abilities between those of the other two pygoscelid penguins, the gentoo and chinstrap. We hypothesize that the Adelie penguins may travel large distances from the rookery during the incubation period so as to forage on the larger and more pelagic krill, Euphausia superba.

Kiwis and dog predation: observations in Waitangi State Forest

Notornis, 35 (3), 197-202

M. Taborsky (1988)

Article Type: Paper

A wild dog was found to kill 13 out of 23 kiwis marked with transmitters. The whole population may have lost 500 out of 900 birds, although this estimate may be conservative. The population will probably need 10-20 years and a rigorous protection scheme to recover to previous densities.
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