Ecological and behavioural evidence for Ecological and behavioural evidence for the systematic status of New Zealand oystercatchers : (Charadriiformes: Haematopodidae) ecologicalbehavi00bake Year: 1974 itflwmt .1 li i ml 1 J III .. * O ' -â¢'â¢*.' . .. â 'WK r â ' 'w '^^ - »^. ..« â ':â¢*â¢''â > .3. â¢â -=-ji â t> .â¢â â¢|# '-: .â W'-'-^ IT 4 ..t,, ,1 t, , i A In, i in, i i -31 * 'W 5^' - ^5 j0 ''r*-. .ti* 'V 3 j5: _-, â â¢r :^*-^ *3^- - - â â¢â¢#'â â ⢠â¢a-^ '>.j Jâiâ\ I L. Z^ .MWmm v:m.â ;:5» Fig. 7. Sound spectrographs of social piping vocalizations of New Zealand oy
Ecological and behavioural evidence for Ecological and behavioural evidence for the systematic status of New Zealand oystercatchers : (Charadriiformes: Haematopodidae) ecologicalbehavi00bake Year: 1974 itflwmt .1 li i ml 1 J III .. * O ' -â¢'â¢*.' . .. â 'WK r â ' 'w '^^ - »^. ..« â ':â¢*â¢''â > .3. â¢â -=-ji â t> .â¢â â¢|# '-: .â W'-'-^ IT 4 ..t,, ,1 t, , i A In, i in, i i -31 * 'W 5^' - ^5 j0 ''r*-. .ti* 'V 3 j5: _-, â â¢r :^*-^ *3^- - - â â¢â¢#'â â ⢠â¢a-^ '>.j Jâiâ\ I L. Z^ .MWmm v:m.â ;:5» Fig. 7. Sound spectrographs of social piping vocalizations of New Zealand oyster- catchers. Spectrographs were made at a tape speed of IV2 inches per second over the frequency range 80-8000Hz. A. Pied phase//. w/Hco/or. D. H. ostralegus finschi. B. Intermediate phase H. unicolor. e. H. chathamensis. c. Black phase H. unicolor. 24
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