Acoustic identification of five insectivorous bats by their echolocation calls in the Sahelian zone of Far North Cameroon

The Journal of Basic and Applied Zoology

Table 2 Descriptive statistics for echolocation parameters of five species of insectivorous bats in the Far North region of Cameroon

Family/species	Call structure	N	Fmax	Fmin	Fmean	Fk	Fc	Duration	Tk	Tc
Molossidae
Chaerephon major	FM	16	39.3 ± 6.9	37.4 ± 6.7	36.4 ± 6.7	38.2 ± 7.3	33.7 ± 7.3	1.66 ± 0.40	0.35 ± 0.	1.46 ± 0.36
Mops condylurus	FM	12	37.8 ± 3.8	34.2 ± 4.9	36.4 ± 4.5	38.2 ± 4.7	33.67 ± 5.1	0.78 ± 0.89	0.003 ± 0.1	0.75 ± 0.75
Mops niveiventer	FM	10	37.7 ± 2.9	34.1 ± 2.6	35.9 ± 2.8	37.6 ± 2.7	34.1 ± 2.6	0.74 ± 0.10	0.00 ± 0.1	0.71 ± 0.65
Vespertilionidae
Scotophilus dinganii	FM/QCF	19	58.5 ± 8.9	52.6 ± 6.2	55.6 ± 7.5	58.5 ± 8.9	52.7 ± 6.2	0.88 ± 0.92	0.03 ± 0.06	0.86 ± 0.84
Scotophilus leucogaster	FM/QCF	12	55.7 ± 4.3	50.6 ± 3.0	53.2 ± 3.6	55.7 ± 4.3	50.7 ± 3.0	0.81 ± 0.23	0.00 ± 0.01	0.80 ± 0.21

The table shows mean ± standard deviation and the range of the eight time and frequency parameters. Recordings were made with ANABAT bat detectors and analyzed with ANALOOK software. Initial slope of call (S1) and slope at the flattest section of the call (Sc) were delibrately excluded from the descriptive statistics. Frequency parameters were measured in kilohertz and time parameters in milliseconds (ms). Based on the sonograms, bats were grouped into two categories: frequency modulation types (FM) and frequency modulation followed by quasi constant frequency types (FM/QCF)
N number of bats in sample, Fmax maximum frequency of the call, Fmin minimum frequency of the call, Fmean mean frequency of the call, F_K frequency at the knee, F_C characteristic frequency, Dur duration of the call, T_K time into the call when F_K is reached, and T_C time into the call when F_C is reached