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First published online October 31, 2008
Journal of Experimental Biology 211, 3529-3535 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.018739
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Single unit responses to skin odorants from conspecifics and heterospecifics in the olfactory bulb of crucian carp Carassius carassius

Stine Lastein1,*, El Hassan Hamdani2 and Kjell B. Døving1

1 Department of Molecular Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, PO Box 1041, N-0316 Oslo, Norway
2 The Biotechnology Centre of Oslo, University of Oslo, PO Box 1125, N-0317 Oslo, Norway


Figure 1
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  		Fig. 1. Dorsal view of the right olfactory bulb showing the position of the electrode trajectories. Each circle represents an electrode trajectory. The colors represent the selectivity of the neurons encountered: dark blue (1), amino acids and spermine; red (2), sex pheromones; green (2), bile salts; and light blue (3), alarm substances. OE, olfactory epithelium; OT, olfactory tract.

 

Figure 2
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  		Fig. 2. Interstimulus and odor-induced activity of single units in the olfactory bulb. Scatter plot of activity (spikes s—1) of units in sub-set 1. The logarithm to the interstimulus activity is plotted against the logarithm to the odor-induced activity. Units are sorted and numbered by their interstimulus activity; the unit with the lowest frequency corresponds to number 1 and the unit with the highest frequency corresponds to number 40.

 

Figure 3
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  		Fig. 3. Neural responses recorded from single units in the olfactory bulb upon odorant stimulation. Examples of the responses in units located in the food region (U1), the pheromone region (U2, U3) and the alarm region (U4), upon stimulation of the olfactory epithelium with amino acids (AA), bile salts (BS), sex pheromones (SP) and skin extract from crucian carp in the high concentration (C). Bars above each trace indicate time course of exposure of the olfactory epithelium with the given stimuli. The duration of each raster trace is 300 s.

 

Figure 4
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  		Fig. 4. Regional differences in single unit responses towards skin extracts from different species. The percentage of neurons activated by each skin extract in the alarm region, the pheromone region and the food region, at the high and the low concentrations of stimuli (see Materials and methods). C, crucian carp; K, common carp; T, tench and B, bream. Numbers in brackets represents the total number of units tested for the corresponding region and stimulus concentration.

 

Figure 5
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  		Fig. 5. Distribution of unique units. The number of unique units, i.e. units responding only to one of the four skin extracts, in the different regions of the olfactory bulb, when applied at (A) the high concentrations and (B) the low concentrations. C, crucian carp; K, common carp; T, tench and B, bream.

 

Figure 6
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  		Fig. 6. The ability of single units to discriminate between skin extracts. The percentage of neurons discriminating between the skin extracts from different species (C, crucian carp; K, common carp; T, tench and B, bream). Pair-wise comparisons are presented for high and low concentrations, in which units were considered to discriminate between two species when responding to only one of the two, and to not discriminate when responding to both or none.

 

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© The Company of Biologists Ltd 2008