Close approaches and acoustic triangulation: techniques for mapping the distribution of booming Australasian bittern (Botaurus poiciloptilus) on small wetlands | Notornis and Birds New Zealand

Notornis

O'Donnell, CFJ¹  Williams, EM¹  Cheyne, J¹ 

关键词: booming;    Botaurus poiciloptilus;    census;    inventory;    monitoring;    New Zealand;   

DOI  :  

学科分类：动物科学

来源: Ornithological Society of New Zealand Inc.

【 摘 要 】

Reliable techniques need to be developed for monitoring the distribution and abundance of the endangered Australasian bittern (matuku, Botaurus poiciloptilus). We trialled 2 complementary methods for estimating the number of booming Australasian bitterns: acoustic triangulation from fixed listening stations, and using kayaks to quietly approach booming birds. Trials were conducted over 2 booming seasons (2011 and 2012) at Hatuma Lake, Hawkes Bay. The 2 methods gave similar estimates of the number of bitterns using Hatuma Lake (2011: 8-9 bitterns by triangulation and 9-10 bitterns by close approaches; 2012: 8-9 bitterns using triangulation and 7-8 bitterns by close approaches). We recommend using close approaches because there appeared to be less count-error or a combination of the 2 methods to estimate numbers of Australasian bitterns on small wetlands (

【 授权许可】

Unknown