Performance of motor systems in Antarctic fishes

作者: John C. Montgomery , John A. Macdonald

DOI: 10.1007/BF00604989

关键词: Saccadic maskingPagothenia borchgrevinkiPhysicsFinSaccadeMotor systemEye movementAmplitudeFish finOpticsGeodesy

摘要: Velocities of swimming and eye movements were measured in several species nototheniid fish living at −1.9 °C McMurdo Sound, Antarctica. 1. The most common mode was labriform. The speed labriform inPagothenia borchgrevinki, a cryopelagic species, linear function pectoral fin beat frequency, reaching maximum 38 cm s−1 (1.8 L s−1) frequency about 2 Hz (Fig. 2). 2. Subcarangiform employed for short dashes escape responses. In this modeP. borchgrevinki attained 110 (4.9 caudal 5.7 Hz. 3. The amplitude saccadic 20° inP. 30° the benthic speciesTrematomus bernacchii andT. centronotus. all 3 correlated with saccade velocity 6). 4. Saccade velocities variable compared those mammals. Outward saccades (away from resting position eye) slower than return same amplitude. outward 50 deg s−1; that 120 s−1. 5. Maximum speeds antarctic are close to predicted by extrapolation temperature temperate fishes, but higher predicted. difference is attributed relative lack compensation muscle, while there greater degree central nervous system.

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