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Aquatic Biology

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AB 30:101-112 (2021)  -  DOI:

First evidence of underwater sounds emitted by the living fossils Lepidurus lubbocki and Triops cancriformis (Branchiopoda: Notostraca)

G. Buscaino1,*, M. Ceraulo1, D. E. Canale1, E. Papale1,2, F. Marrone3

1BioacousticsLab, National Research Council, via del Mare, 6, 91021 Torretta Granitola, Italy
2Department of Life Science and Systems Biology, University of Torino, 10124 Torino, Italy
3Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, via Archirafi 18, 90123 Palermo, Italy
*Corresponding author:

ABSTRACT: Sound is the most effective means of communication in marine and freshwater ecosystems. However, no data about acoustic emissions from non-malacostracan crustaceans are currently available, so their ability to produce sounds is unknown. For the first time, this study investigated the sound produced by 2 tadpole shrimp species, Triops cancriformis and Lepidurus lubbocki. L. lubbocki individuals were collected from a natural temporary pond in Sicily (Italy), whereas T. cancriformis individuals were obtained from eggs contained in sediment from a rock pool in Sardinia (Italy). In the laboratory, experimental tanks with the animals (one species at a time) were acoustically monitored. Both species produced high-frequency, wideband pulses distinguishable by their sound pressure level, which was higher in L. lubbocki (146 dB) than in T. cancriformis (130 dB), and by their first and second peak frequencies, which were higher in L. lubbocki (65 and 86 kHz) than in T. cancriformis (63 and 71 kHz). The energy distributions in the power density spectra showed different shapes, as revealed by the 3 dB bandwidth and centre frequency. The pulse durations were 88 and 97 µs in L. lubbocki and T. cancriformis, respectively. L. lubbocki presented a higher emission rate than T. cancriformis and a marked circadian pattern, with a higher abundance of sounds during the night. This study reports the first evidence of sound emissions from non-malacostracan crustaceans and reveals the high potential of passive acoustic monitoring to detect the presence, abundance, and life cycle of these elusive keystone species of temporary water bodies.

KEY WORDS: Notostraca · Sounds · Passive acoustic monitoring · Temporal pattern

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Cite this article as: Buscaino G, Ceraulo M, Canale DE, Papale E, Marrone F (2021) First evidence of underwater sounds emitted by the living fossils Lepidurus lubbocki and Triops cancriformis (Branchiopoda: Notostraca). Aquat Biol 30:101-112.

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