Acoustic comparison of a patchy Mediterranean shallow water seascape: Posidonia oceanica meadow and sandy bottom habitats

Ceraulo, María; Papale, Elena; Caruso, Francesco; Filiciotto, Francesco; Grammauta, Rosario; Parisi, Ignazio; Mazzola, Salvatore; Farina, Almo; Buscaino, Giuseppa

doi:10.1016/j.ecolind.2017.08.066

Cited by 41 publications

(32 citation statements)

References 72 publications

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“…Our results regarding the influence of the amplitude filter on ACI efficiency are in accordance with 32 . In our controlled experiment, the amplitude filter was indeed required to discriminate small variations of O .…”

Section: Discussionsupporting

confidence: 90%

“…Additionally, a narrow low-frequency band is mostly occupied by temporally patterned fish vocalisations, and very frequent unpatterned broadband sounds originating from benthic organisms are superimposed to different levels of environmental noise. Despite these differences, an increasing number of studies have applied the ACI to aquatic environments in order to gain information about diversity or ecological state 22 – 32 . This index measures the complexity of the biophonical component, providing an indirect and immediate measure of biogenic sound dynamics 18 .…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Complexity of vocal fish communities: a field and controlled validation

Bolgan

Amorim

Fonseca

et al. 2018

Sci Rep

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The Acoustic Complexity Index (ACI) is increasingly applied to the study of biodiversity in aquatic habitats. However, it remains unknown which types of acoustic information are highlighted by this index in underwater environments. This study explored the robustness of the ACI to fine variations in fish sound abundance (i.e. number of sounds) and sound diversity (i.e. number of sound types) in field recordings and controlled experiments. The ACI was found to be sensitive to variations in both sound abundance and sound diversity, making it difficult to discern between these variables. Furthermore, the ACI was strongly dependent on the settings used for its calculation (i.e. frequency and temporal resolution of the ACI algorithm, amplitude filter). Care should thus be taken when comparing ACI absolute values between studies, or between sites with site-specific characteristics (e.g. species diversity, fish vocal community composition). As the use of ecoacoustic indices presents a promising tool for the monitoring of vulnerable environments, methodological validations like those presented in this paper are of paramount importance in understanding which biologically important information can be gathered by applying acoustic indices to Passive Acoustic Monitoring data.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Acoustic Complexity of vocal fish communities: a field and controlled validation

Bolgan

Amorim

Fonseca

et al. 2018

Sci Rep

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“…Moreover, ACIt f has been used to investigate animal phenology [89,90] and to estimate the effect of anthropogenic noise [91]. This index has also been demonstrated to be a good proxy of richness and diversity of the communities in forest areas [74,92] and marine and freshwater systems [93][94][95]. The graphic representation of ACIt f depicts the acoustic signature.…”

Section: Characteristics Of Acit F and Acif Tmentioning

confidence: 99%

Ecoacoustics: A Quantitative Approach to Investigate the Ecological Role of Environmental Sounds

Farina

2018

Mathematics

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Ecoacoustics is a recent ecological discipline focusing on the ecological role of sounds. Sounds from the geophysical, biological, and anthropic environment represent important cues used by animals to navigate, communicate, and transform unknown environments in well-known habitats. Sounds are utilized to evaluate relevant ecological parameters adopted as proxies for biodiversity, environmental health, and human wellbeing assessment due to the availability of autonomous audio recorders and of quantitative metrics. Ecoacoustics is an important ecological tool to establish an innovative biosemiotic narrative to ensure a strategic connection between nature and humanity, to help in-situ field and remote-sensing surveys, and to develop long-term monitoring programs. Acoustic entropy, acoustic richness, acoustic dissimilarity index, acoustic complexity indices (ACItf and ACIft and their evenness), normalized difference soundscape index, ecoacoustic event detection and identification routine, and their fractal structure are some of the most popular indices successfully applied in ecoacoustics. Ecoacoustics offers great opportunities to investigate ecological complexity across a full range of operational scales (from individual species to landscapes), but requires an implementation of its foundations and of quantitative metrics to ameliorate its competency on physical, biological, and anthropic sonic contexts.

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“…Neptune seagrass meadows are crucial habitats that provide refuge, nursery and food to several fish and invertebrate species (Gobert et al, 2006;Abadie et al, 2018). It is somehow surprising that the first descriptions of the Neptune seagrass soundscape and of its fish biophonical component have been published only very recently (Ceraulo et al, 2018;Di Iorio et al, 2018). Di Iorio et al (2018) recorded the soundscape of nine Western Mediterranean meadows (over a 200 km range) over 7 months (March-October).…”

Section: Introductionmentioning

confidence: 99%

“…<500 Hz; Desiderà et al, 2019), and only a few show harmonic and pseudo-harmonic contours. The /Kwa/ has been registered over a wide geographical range, from French and Corsican coastlines (Di Iorio et al, 2018) to Sicily (Ceraulo et al, 2018; the /Kwa/ was here called 'medium frequency fish sound') and Ustica Island (Hermand, 2006) and from Crete (M.B., personal observation) to the Azores (Rita Carriço, personal communication), passing through the Balearic islands (M.B., personal observation; Correa et al, 2018, 'croak sound'). None of the 38 currently identified Mediterranean vocal fish species produces the /Kwa/ (Di .…”

Section: Introductionmentioning

confidence: 99%

The sea chordophones make the mysterious /Kwa/: emitter identification of the dominating fish sound in Mediterranean seagrass meadows

Bolgan

Soulard

Iorio

et al. 2019

Journal of Experimental Biology

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The /Kwa/ vocalization dominates the soundscape of Posidonia oceanica meadows but the identity of the species emitting this peculiar fish sound remains a mystery. Information from sounds recorded in the wild indicates that the emitting candidates should be abundant, nocturnal and benthic. Scorpaena spp. combine all these characteristics. This study used an interdisciplinary approach to investigate the vocal abilities of Scorpaena spp.; morphological, histological and electrophysiological examinations were interpreted together with visual and acoustic recordings conducted in seminatural conditions. All observed Scorpaena spp. (S. porcus, S. scrofa and S. notata) share the same sonic apparatus at the level of the abdominal region. This apparatus, present in both males and females, consists of 3 bilaterally symmetrical muscular bundles, having 3-5 long tendons, which insert on ventral bony apophyses of the vertebral bodies. In all chordophones (stringed instruments), the frequency of the vibration is dependent on the string properties and not on the rate at which the strings are plucked. Similarly, we suggest that each of the 3-5 tendons found in the sonic mechanism of Scorpaena spp. acts as a frequency multiplier of the muscular bundle contractions, where the resonant properties of the tendons determine the peak frequency of the /Kwa/, its frequency spectra and pseudoharmonic profile. The variability in the length and number of tendons found between and within species could explain the high variability of /Kwa/ acoustic features recorded in the wild. Finally, acoustic and behavioural experiments confirmed that Scorpaena spp. can emit the /Kwa/ sound.

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Acoustic comparison of a patchy Mediterranean shallow water seascape: Posidonia oceanica meadow and sandy bottom habitats

Cited by 41 publications

References 72 publications

Acoustic Complexity of vocal fish communities: a field and controlled validation

Acoustic Complexity of vocal fish communities: a field and controlled validation

Ecoacoustics: A Quantitative Approach to Investigate the Ecological Role of Environmental Sounds

The sea chordophones make the mysterious /Kwa/: emitter identification of the dominating fish sound in Mediterranean seagrass meadows

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