Plasticity of electric organ discharge waveform in the South African Bulldog fish, Marcusenius pongolensis: tradeoff between male attractiveness and predator avoidance?

Table 1 Change of EOD duration in male M. pongolensis under Treatments 1 and 2

tank	fish	D1 (μs)	D2 (μs)	Increase in %	after days	D3 (μs)	D4 (μs)	increase in %
A	RM1	364 ± 6.8	833.0 ± 9.8	129	21	-	-	-
	RM2	452 ± 5.9	578.0 ± 11.8	27.9	21	-	-	-
	SM3	461 ± 7.3	637.0 ± 14.5	38.2	21	-	-	-
B	RM4	356 ± 2.1	2029 ± 55	470	25	-	-	-
	SM5	456 ± 7.8	1527 ± 32	234	26	-	-	-
	SM6	480 ± 5.6	793 ± 3.5	65	33	-	-	-
C	M7	456 ± 7	1056 ± 18	131.6	19	578.2 ± 9	1511 ± 34	161.4
	M8	360 ± 12	1259 ± 14	249.7	17	467.5 ± 6.2	2148 ± 61	359.5
	F1	data listed in Table 2
D	M9	401 ± 4.5	2178 ± 57	443	23	1098 ± 14	2408 ± 69	119
	M10	519 ± 24.7	1574 ± 63	203.3	33	652.6 ± 5.6	1134 ± 72	73.8
	F2	data listed in Table 2

D1, mean EOD duration ± SD, N = 5 before exchanging animals or introducing plastic mesh partitions; D2, maximum EOD duration ± SD, N = 5 evoked by treatment; D3 minimum EOD ± SD, N = 5 duration after stopping treatment (introduction of solid plastic walls); D4 maximum EOD duration ± SD, N = 5 after onset of a second treatment.

ISSN: 1742-9994