Random Forest population modelling of striped and common-bottlenose dolphins in the Gulf of Taranto (Northern Ionian Sea, Central-eastern Mediterranean Sea)

Carlucci, Roberto; Cipriano, Giulia; Paoli, Chiara; Ricci, Pasquale; Fanizza, Carmelo; Capezzuto, Francesca; Vassallo, Paolo

doi:10.1016/j.ecss.2018.02.034

Cited by 49 publications

(26 citation statements)

References 82 publications

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“…In practice, however, the observation, classification, and recording of a state takes time (from few seconds to minutes) especially when a group was composed of many individuals. After recording the predominant activity state for each instantaneous scan ( Table 1 according to Carlucci et al, 2018b), the prevalent behavioral category during the entire session was considered as the activity state of the focal group during the encounter. Thus, for example if we have recorded 3 out of 5 occasions the socializing category, the prevalent behavior in that encounter was defined as socializing.…”

Section: Data Collectionmentioning

confidence: 99%

The Social Role of Vocal Complexity in Striped Dolphins

Papale

Fanizza²,

Buscaino

et al. 2020

Front. Mar. Sci.

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Section: Data Collectionmentioning

confidence: 99%

The Social Role of Vocal Complexity in Striped Dolphins

Papale

Fanizza²,

Buscaino

et al. 2020

Front. Mar. Sci.

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“…In this regard, monitoring the conservation status of this endangered dolphin species at both the local and Mediterranean regional scale is particularly relevant to fulfil targets under the range of several international agreements such as the Habitats Directive (Annex IV), the Barcelona Convention (Annex II), the Convention on Biological Diversity, and the ACCOBAMS agreement. Moreover, D. delphis and other cetacean species represent key taxa in the marine food web, as they are highly responsive to anthropogenic impacts, assuming a significant role in addressing a Good Environmental Status (GES) for EU marine ecosystems according to the Marine Strategy Framework Directive (MSFD) [21][22][23]. Therefore, providing information on the occurrence and abundance estimates of D. delphis is essential to support the implementation of effective conservation measures to maintain safe population levels and to suggest appropriate modifications to limit potential threats.…”

Section: Introductionmentioning

confidence: 99%

Density and Abundance of Delphinus delphis in Waters South of Samos Island, Greece (Eastern Mediterranean Sea)

Cipriano

Ashok²,

Antichi³

et al. 2020

JMSE

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The Mediterranean subpopulation of short-beaked common dolphin Delphinus delphis is ranked as endangered on the IUCN (International Union for Conservation of Nature) Red List because it has sharply declined during the last decades, resulting in sparse and decreasing populations. Monitoring the conservation status of this endangered dolphin species is particularly relevant to fulfil targets under the range of several international agreements. Moreover, estimating the abundance of D. delphis is essential to verify the effectiveness of conservation action to maintain safe population levels in the Mediterranean Sea and to suggest appropriate modifications to limit potential threats. In this regard, a monitoring program of the short-beaked common dolphin in Samos Island (Greece) was carried out from 2016 to 2019, adopting a random line transect sampling method. The overall density and abundance estimates of D. delphis, obtained by applying conventional distance sampling (CDS) on sighting data, were 0.15 individuals/km2 (CV = 13.27%; 95% CI = 0.11–0.19 individuals/km2) and 51 individuals (CV = 13.27%; 95% CI = 40-66 individuals), respectively. Although, a longer time series of sighting data should be collected and a larger area should be investigated to better understand the population trend of D. delphis and its residency pattern, the results contribute to setting up a baseline reference for future assessment of its population in the Eastern Aegean Sea.

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“…Thus, partial dependence plots were used to graphically characterize relationships between individual explanatory variables and response obtained from RF [28]. Random forest has been recently applied to cetacean distribution and abundance analyses [19, 23, 29] demonstrating high accuracy and reliability.…”

Section: Methodsmentioning

confidence: 99%

Eavesdropping on dolphins: Investigating the habits of bottlenose dolphins (Tursiops truncatus) through fixed acoustic stations

et al. 2019

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This study investigates the bottlenose dolphin (Tursiops truncatus, Montagu 1821) habitat use in the Portofino marine protected area (NW Italy) and adjacent waters, a core area for the dolphins and a highly touristic area in the Mediterranean Sea. A permanent automated real-time passive acoustic monitoring system, able to detect and track dolphins continuously, was tested in the area within the activities of the Life+ Nature project ARION. The habits of bottlenose dolphins was investigated considering the resident rate inside the area, which quantifies the amount of time dolphins spent in these waters, by means of random forest regression. The dependency of dolphin resident rate was analyzed in relation to four explanatory variables: sea surface temperature, season, time of day, and proximity to the coast. Dolphins spent more time in the area during spring and when sea surface temperature ranged between 15–16°C. Summer resulted the season with lower dolphin residency with significant difference between working day and weekend, in the last the lowest residency was recorded. Main findings provide important information to properly manage the area in order to protect bottlenose dolphins.

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Random Forest population modelling of striped and common-bottlenose dolphins in the Gulf of Taranto (Northern Ionian Sea, Central-eastern Mediterranean Sea)

Cited by 49 publications

References 82 publications

The Social Role of Vocal Complexity in Striped Dolphins

The Social Role of Vocal Complexity in Striped Dolphins

Density and Abundance of Delphinus delphis in Waters South of Samos Island, Greece (Eastern Mediterranean Sea)

Eavesdropping on dolphins: Investigating the habits of bottlenose dolphins (Tursiops truncatus) through fixed acoustic stations

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