Table 2. Reactions of pipistrelle bats during encounters.

	Δ individual terminal frequency by cd 5.5 ms [kHz]	Sequence	Individual	Individual terminal frequency by cd 5.5. ms (mean ± sd) [kHz]	Reaction distance [m]	Minimal inter-individual distance [m]	n calls in flight with conspecific	n calls in flight with conspecific by cd 3.5–9.5 ms	n in transmission channel in flight with conspecific by cd 3.5–9.5 ms	[%] in transmission channel in flight with conspecific by cd 3.5–9.5 ms	Attention hypothesis	JAR hypothesis
encounter	<1	3a	Bat 1 Bat 2	47.0 ± 1.0 46.5 ± 0.7	2.8 5.4	1.2	21 26	21 21	20 19	95.2 90.5	+
		7	Bat 1 Bat 2*	47.1 ± 0.6 47.4 ± 0.7	10.8 3.5	3.5	24 27	24 27	20 26	83.3 96.3	+
		2b	Bat 1* Bat 2	47.5 ± 0.6 47.6	3.2 3.9	1.1	18 19	14 17	11 17	78.6 100	+	+
	1–2	4a	Bat 1* Bat 2	45.0 ± 0.6 46.5	6.2 7.8	1.9	21 19	19 18	19 12	100 66.6	+	+
		6	Bat 1* Bat 2	46.9 ± 0.5 45.5 ± 0.5	4.9 −	2.8	19 19	16 19	16 19	100 100	+
	2–3	12a	Bat 1* Bat 2	46.6 ± 0.5 48.8 ± 0.5	8.1 8.9	4.3	8 10	8 10	7 10	87.5 100	+
		1a	Bat 1* Bat 2	46.6 ± 0.7 48.8 ± 0.6	1.5 1.5	0.6	18 15	12 15	11 15	91.7 100	+
		9	Bat 1 Bat 2	44.9 ± 0.8 47.1 ± 0.8	5.0 6.8	3.3	31 17	31 16	27 12	87.1 75	+
		11	Bat 1* Bat 2	44.9 ± 0.8 47.1 ± 0.8	10.3 4.5	4.3	15 9	15 9	15 8	100 88.9	+
		5	Bat 1* Bat 2	43.5 ± 0.8 46.2 ± 0.7	X 3.2	2.8	14 11	9 11	8 11	88.9 100	+
	3–4	13	Bat 1 Bat 2	48.2 ± 0.8 45.1 ± 0.5	− −	7.4	15 19	15 19	12 18	80 94.7	+	+

Reaction distances without values (−) mark non-reacting individuals, cd = call duration. Reaction distance value marked by ‘X’ could. not be measured.