THE SHORT AND LONG-TERM EFFECTS OF TEMPERATURE ON THE DYNAMIC-RANGE OF SIGNALING IN HORIZONTAL CELLS OF CARP RETINA

1. Intracellular recordings of luminosity horizontal cell responses we re made from retinas isolated from carp (Cyprinus carpio) acclimated f or at least three weeks to temperatures of 8, 16 and 26 degrees C. 2. Changing the temperature of the isolated retina resulted in an increas e in the rate of rise and fall phases of horizontal responses and a re duction of response latency as temperature increased. 3. The maximum a mplitudes (V-max) of horizontal cell responses were reduced for low an d high temperatures with a small, intermediate range over which the la rgest values of V-max were recorded. 4. The range of temperatures for which V-max was maximum was found to be dependent on the temperature o f acclimation in an adaptive manner.