689
RESUMEN.
Tursiops truncatus truncatus
Palabras clave:
Validation of low-cost hydrophones for acoustic detection of bottlenose dolphins (Tursiops trun-
catus truncatus) in a controlled environment
ABSTRACT.
Tursiops truncatus truncatus
Validación de hidrófonos de bajo costo para la detección
acústica de los delnes nariz de botella (Tursiops truncatus truncatus)
en un ambiente controlado
Agustina C. Macchi Bruno V. Menna
Ariel G. Cabreira Diego H. Rodriguez
Gisela V. Giardino
Marine and
Fishery Sciences
MAFIS
Marine and Fishery Sciences 38 (4): 689-701 (2025)
Phocoena phocoena Neopho-
caena asiaeorientalisPon-
toporia blainvillei.
Tursiops truncatus truncatus
clicks
μ
clicks
Inter-Click Interval
μ .
chirps
brays calls
moanssqueaks
.
.
Key words:
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus
T. truncatus truncatus
Área de estudio
'"'
"
T. truncatus
truncatus
Adquisición de registros sonoros
Soundtrap
Marine and Fishery Sciences 38 (4): 689-701 (2025)
Handy Recorder
SoundTrap
Soundtrap
Handy
Recorder
Figure 1. A) Self-contained commercial hydrophone Soundtrap ST300 HF (ST, Ocean Instruments, Auckland, New Zealand).
B) Low-cost homemade hydrophone with stereo cable on the end, PVC stand, and portable Zoom H12 Handy Recorder.
AB
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus
Análisis de datos
.
Figure 2. Synchronous acoustic recordings of bottlenose dolphins with the low-cost hydrophone and the commercial hydrophone
at Aquarium Mar del Plata, Argentina. Dolphins remained behind railings to restrict their access.
Marine and Fishery Sciences 38 (4): 689-701 (2025)
±
−
clic-
kschirps
±
±
=>
±
±
=>
±
±
=>
±
±
Figure 3. Categorization of bottlenose dolphin whistles recorded at Aquarium Mar del Plata: ascending (A); descending (B);
constant (C); convex (D); concave (E); and continuously modulated (F).
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus
=>
clicks
chirps
.
Soundtrap
===
===
Table 1. Robust whistle parameters for Soundtrap and low-cost equipment based on recordings from bottlenose dolphins at Aquar-
ium Mar del Plata, Argentina. DS = standard deviation; CV = coecient of variation; Mín. = minimum observed value;
Máx. = maximum observed value; V = Wilcoxon paired-samples test value. Signicancia=signicance, NS (not signicant).
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Marine and Fishery Sciences 38 (4): 689-701 (2025)
696
Delphinus capensisT. truncatus truncatus).
=
Lissodelphis peronii
Lagenorhynchus cruciger
Pontoporia blainvi-
lleiCephalorhyncuhs eutropia
T. truncatus
gephyreus
.
.
T. truncatus gephyreus
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus
Contribución de autores
Tursiops trun-
catus
Tursiops truncatus
Lithodes santolla
Monachus monachus
Marine and Fishery Sciences 38 (4): 689-701 (2025)
698
Phocoena phoc-
oena.
.
Pontoporia blainvillei
.
.
Tursiops
Tursiops truncatus
Tursiops truncatus
Tursiops
truncatus
Tursiops truncatus
Tursiops truncatus
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus 699
8
Neo-
phocaena asiaeorientalis
Tursiops truncatus
gephyreus
Marine and Fishery Sciences 38 (4): 689-701 (2025)
overlap
Figure A1. Example of acoustic signal comparison between the low-cost hydrophone (A) and a commercial one (B) recorded from
bottlenose dolphins at Aquarium Mar del Plata, Argentina. Spectrogram adjusted for better visualization of the whistles
at 46 kHz, Hann with advantage size 512, DFT size: 512, 50% overlap.
Amplitud
(dB)
-20
-40
-60
-80
40
30
20
10
0
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5
Tiempo (s)
Amplitud Frecuencia (kHz)
Amplitud
(dB)
-20
-40
-60
-80
40
30
20
10
00,0 0,5 1,0 1,5 2,0 2,5 3,0
Tiempo (s)
Amplitud Frecuencia (kHz)
-100
A
B
Macchi et al.: Validación de hidrófonos de bajo costo para la detección acústica de Tursiops truncatus
=<
=<
=<
=
<
=<
Soundtrap
===
===
Table A1. Whistle parameters for Soundtrap and low-cost equipment based on recordings from bottlenose dolphins at Aquarium
Mar del Plata. DS = standard deviation; CV = coecient of variation; Mín. = minimum observed value; Máx. = maximum
observed value; V = Wilcoxon paired-samples test value. Signicancia =signicance, NS (not signicant).
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
Soundtrap
