IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
SOUND PRODUCTION MECHANISM IN THE SEMITERRESTRIAL CRAB NEOHELICE GRANULATA (BRACHYURA, VARUNIDAE)
Autor/es:
SAL MOYANO M. P.; BUSCAINO G; SALVATORE M; CERAULO M; GAVIO M. A.
Reunión:
Congreso; The effects of noise on aquatic life; 2019
Resumen:
Neohelice granulata sound production was previously characterized (Filiciotto et al., 2016). However, no studies were conducted to recognize which sex and structures are involved in sound production. Our aim was to identify the sound production mechanism and the sex of the individual producing it in N. granulata in a reproductive context. Crabs were collected at Mar Chiquita Coastal Lagoon (37°45´S, 57°19´W, Buenos Aires, Argentina) and transported to the laboratory. Experimental trials consisted in locating (1) a receptive female (RF) + a male (M), (2) a non-receptive female (NRF) + a male, (3) a RF + two M, (4) an NRF + two M. Nine replicates per trial were conducted. Experimental PVC tank was circular (1.2m diameter, 1.5m depth) covered with rubber to avoid sound signals of crabs when walking. A hydrophone (Reson TC4013, 1Hz-170kHz, -211dB) was in the center of the tank at 20cm depth. A GoPro camera was in the central surface to include all the tank bottom superficies. Experiments begun after locating the crabs in the center of the tank and finished 1h after. We analyzed jointly the video and the acoustic signals emission to identify the individual/type of movement/structures making sound. The number of agonistic encounters (each time two males contacted with their cheliped) was quantified. The body structures involved in making sound were dissected and processed to its observation by scanning electron microscopy. Sounds signals were produced by males by moving one cheliped in an up-down movement by rubbing the merus against the lateral cephalothorax, below the eyes. The number of acoustic signals and up-down cheliped movements was different among trails (Kruskal-Wallis: H=9.21, p