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Counting terrestrial bird species in mixed habitats: an assessment of relative conspicuousness

Notornis, 48 (1), 47-53

B. McKinlay (2001)

Article Type: paper

Conspicuousness of terrestrial birds from a distribution study using 100 ha squares based on the New Zealand map grid was investigated. Logistic regression was used to determine the amount of time observers should spend in each square to have a 50% chance of detecting any given bird species if it was present. The analysis was conducted for 3 habitats. For 14 species of native and introduced birds, the length of time necessary to determine presence was 1 – 631 min. To ensure that most species are accounted for in future distribution studies using similar grids, it is recommended that observers spend 1 h in each square.






Status and breeding biology of the Chatham Island tomtit ( Petroica macrocephala chathamensis )

Notornis, 48 (4), 207-216

R.G. Powlesland; D.V. Merton; D. Crouchley; S. O'Connor (2001)

Article Type: paper

The population status of the Chatham Island tomtit (Petroica macrocephala chathamensis ) was determined for each island of the Chathams group, east of New Zealand. Also, the breeding biology of the population on Rangatira (South East Island), which is free of introduced mammalian pests, was determined from observations made during 8 breeding seasons, 1981/82 to 1988/89. The total population of the Chatham Island tomtit is estimated to be