. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPONSES OF LOBSTER CHEMORECEPTORS 369 100 lu 80- u~> -z. o Q- 60 40- 20- 0 _i UJ 1 HYDROXYPRDLINE CELLS tAJJj _i-*_ MIX TAU LEU NH4 CLN ASN ASP CLU AS* HYP ARG LYS BET PRO GLY ALA HIS 100 80- n n hll i/> UJ tr 411 UJ > â âi ->c 20 i UJ LC 0 i TAURINE CELLS *i****i**.«.* MIX TAU LEU NH4 GLN ASN ASP GLU ASK HYP ARG LYS BET PRO GLY ALA HIS lOOi 80 n 0_ hll UJ 111 rr 411 LU > â â< iâ ?n <. j iii CT 0 I ARCININE CELLS I *i^ .**.. MIX TAU LEU NH4 GLN ASN ASP GLU ASK HYP ARG LYS BET PRO GLY ALA HIS Figure
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPONSES OF LOBSTER CHEMORECEPTORS 369 100 lu 80- u~> -z. o Q- 60 40- 20- 0 _i UJ 1 HYDROXYPRDLINE CELLS tAJJj _i-*_ MIX TAU LEU NH4 CLN ASN ASP CLU AS* HYP ARG LYS BET PRO GLY ALA HIS 100 80- n n hll i/> UJ tr 411 UJ > â âi ->c 20 i UJ LC 0 i TAURINE CELLS *i****i**.«.* MIX TAU LEU NH4 GLN ASN ASP GLU ASK HYP ARG LYS BET PRO GLY ALA HIS lOOi 80 n 0_ hll UJ 111 rr 411 LU > â â< iâ ?n <. j iii CT 0 I ARCININE CELLS I *i^ .**.. MIX TAU LEU NH4 GLN ASN ASP GLU ASK HYP ARG LYS BET PRO GLY ALA HIS Figure 3. Responses of the three main chemoreceptor cell popula- tions found in the medial antennular filaments of Homarus america- nus. Bars indicate mean response + SEM of all cells in each population, normalized to the response to the best stimulus (= 100%). gans and which, for reasons perhaps unrelated to stimu- lus-receptor binding affinities, have a relatively low firing rate (Johnson etai, 1984, 1988). We found no difference in discharge pattern between medial and lateral filament receptors. Medial antennular receptors typically responded to increasing stimulus con- centration with a gradual increase in spike number and response duration (Fig. 4). A similar discharge pattern was observed in H. americanus lateral receptors (John- son et al, 1985). Likewise, Thompson and Ache (1980) found no difference in response duration between medial and lateral filament receptors in P. argas. These results contrast with those of Fuzessery (1978) who reported that, for taurine sensitive cells in P. argus, responses of medial receptors were tonic, whereas responses of lateral receptors were phasic. Despite similarities in response spectrum, and in the response magnitude, pattern, and sensitivity of individ- ual cells, the medial and lateral antennular filaments are not behaviorally equivalent. Ablation experiments dem- onstrated that both P. argus (Reeder and Ache, 1980) and H. america
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
