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Diving activity of hoary-headed (Poliocephalus poliocephalus) and australasian little (Tachybaptus novaehollandiae) grebes

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Ropert‐coudert, Yan | Kato, A.

Edité par CCSD ; Waterbird Society -

International audience. In austral spring 2006, a year of severe drought condition, we timed 314 and 133 dive and subsequent surface durations of Hoary-headed (Poliocephalus poliocephalus) and Australasian Little Grebes (Tachybaptus novaehollandiae), respectively, at a freshwater lake in southern Australia. Hoary-headed Grebes stayed submerged for longer (18.5 ± 3.6 s) than the Australasian Little Grebes (15.7 ± 4.2 s and 2.1 ± 1.1, respectively). Consequently, Hoary-headed Grebes maintained a high and constant diving efficiency (2.33 ± 0.25) – measured as the dive:pause ratio – throughout the study suggesting that they are better at facing changes in water level of their lacustrine environment than the Australasian Little Grebes, which showed an erratic and lower (1.95 ± 0.48) dive efficiency.

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