Sasia Johansen

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Hearing thresholds of a great cormorant (Phalacrocorax carbo) were measured in air and under water using psychophysics. The lowest thresholds were at 2 kHz (45 dB re 20 μPa root-mean-square [rms] in air and 79 dB re 1 μPa rms in water). Auditory brainstem response measurements on one anesthetized bird in air indicated an audiogram with a shape that(More)
The Black-faced Sheathbill (Chionis minor) is a sedentary and polytypic species. Four allopatric subspecies are known, each breeding on one archipelago in the Southern Indian Ocean. To evaluate the degree of isolation of these four subspecies, morphometrics and vocalizations of adult birds of Iles Kerguelen and Crozet were compared with those of the other(More)
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