Mitochondrial Variation of Bottlenose Dolphins (Tursiops truncatus) from the Canary Islands Suggests a Key Population for Conservation with High Connectivity within the North-East Atlantic Ocean

Animals, Год журнала: 2024, Номер 14(6), С. 901 - 901

Опубликована: Март 14, 2024

In recent decades, worldwide cetacean species have been protected, but they are still threatened. The bottlenose dolphin (

Язык: Английский

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Common and Tamanend's bottlenose dolphins Tursiops truncatus ( ) and T. erebennus ( )

Elsevier eBooks, Год журнала: 2025, Номер unknown, С. 155 - 226

Опубликована: Янв. 1, 2025

Язык: Английский

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Investigating the presence of different bottlenose dolphin ecotypes in the Mediterranean Sea

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Фев. 14, 2025

The common bottlenose dolphin is a cosmopolitan species that can be found worldwide in all oceans except polar and sub-polar waters. This wide distribution associated with certain level of morphological variation, which seems consistent the presence globally distributed pelagic/offshore ecotype several coastal/inshore ecotypes along continental shelf. In Mediterranean Sea, regularly occurring second most sighted cetacean after striped dolphin. According to some studies, more closely related Atlantic coastal ecotype, while others suggest closer link pelagic ecotype. apparent contradiction could stem from coexistence two also within as suggested by genetic analyses. We analysed data collected 2004 2019 43 different research groups, areas basin, shared on web-based GIS platform Intercet. movements 4919 dolphins, individually identified through their natural dorsal fin markings, relation bathymetry particular 200-meter isobath marks edge addition, we reconstructed associations between individuals connectivity networks, identify possible segregations ecotypes. Our results show geographical units find habitat over shelf, do not support (pelagic vs. coastal) living parapatry, described adjacent waters eastern Ocean.

Язык: Английский

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If These Walls Could Talk: Investigating Bottlenose Dolphin Occupancy and Range in Fiord Ecosystems Using Passive Acoustic Monitoring and Visual Surveys

Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2025, Номер 35(3)

Опубликована: Март 1, 2025

ABSTRACT Effective management of protected species requires a comprehensive understanding their ecology. Within the Fiordland (Te Moana o Atawhenua) Marine Area (FMA) in south‐western Aotearoa/New Zealand, two four recognised bottlenose dolphin ( Tursiops truncatus ) subpopulations are considered resident to discrete fiord systems. Opportunistic sightings outside Patea/Doubtful and Tamatea/Dusky Sound complexes, however, indicate these occupy larger space than is currently recognised. To investigate use remote spaces FMA, passive acoustic monitoring equipment was deployed six southern fiords. Acoustic data were collected between February 2022 November 2023 using types devices: F‐PODs detect click trains odontocetes SoundTraps collect recordings explore variety call types. We used automated classifiers/detectors manual browsing various vocalisation better understand occupancy at each site, we constructed hierarchical Bayesian model estimate detection probabilities different collection signal approaches. Photo‐identification identify individual dolphins areas, differences visual methods explored. This study demonstrates that dolphins, including regularly fiords not part habitat range may often FMA. increased spatial ecology underscores need for re‐evaluation potential threats throughout this region.

Язык: Английский

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Risso's Dolphin Site Fidelity in the Western Mediterranean Sea: The Importance of Submarine Canyons

Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2025, Номер 35(5)

Опубликована: Май 1, 2025

ABSTRACT Knowledge on the distribution of species provides baseline information towards their conservation and management human activities affecting them. For endangered species, such as Risso's dolphin ( Grampus griseus ) in Mediterranean Sea, highlighting areas within range to which individuals regularly return can reveal patterns site fidelity. dolphin, this is scarce Sea. Here, photo identification was used assess fidelity Garraf submarine canyon system (NW Sea). Data collected along 237 boat surveys between 2017 2023 resulted 56 sightings 364 unique individuals. Eight Site Fidelity Indices (SFIs) were calculated for each individual based three indicators: Occurrence, Permanence Periodicity. A divisive hierarchical clustering analysis eight SFIs detect different degrees residency. Individuals seen more than 2 months divided into clusters defined seasonal residents, regular occasional visitors, whereas only 1 month considered be transient. Results show importance highlight need expand studies further regions better understand movements a wider context western

Язык: Английский

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Initial results on the variation of whistle characteristics of bottlenose dolphins from two neighbouring regions of the Mediterranean Sea: Northern Ionian and Southern Adriatic Sea

Frontiers in Marine Science, Год журнала: 2023, Номер 10

Опубликована: Янв. 23, 2023

Bottlenose dolphins have a complex vocal repertoire that varies depending on behavioral context, social structure, group composition, and anthropogenic pressures. This current study describes the whistle characteristics of bottlenose for first time in South Adriatic Sea while assessing potential differences between geographically separated within neighbouring waters North Ionian Sea. The results show were similar Taranto Gulf (Italy) Boka Bay (Montenegro), despite their spatial differences. mean peak frequency was 10kHz each location minimum maximum ranged from 7 to 14kHz. average duration whistles 500 milliseconds. These share similarities with previous literature, although several studies reported slightly different frequencies, ranging up 15kHz Croatia Italy. Further, harmonics produced formed 40% 30% Bay. A high incidence has previously been associated states (i.e., travelling) certain types marine traffic fishing vessels). Therefore, it is important collect simultaneous data visual behavior focal as well document type density proximity an in-depth understanding behavior. Despite Bay, contours showed notable variations. Upsweep most regularly location, which coincides Mediterranean However, least had concave contour flat Previous confirmed account Basin. Examining variation provides complexity its plasticity presence pressure. future need include behavior, noise levels, human enable effective dolphins.

Язык: Английский

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Connectivity patterns of bottlenose dolphins (Tursiops truncatus) in the north-east Mediterranean: implications for local conservation

Conservation Genetics, Год журнала: 2023, Номер 25(2), С. 409 - 426

Опубликована: Сен. 23, 2023

Язык: Английский

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Whales and dolphins of the Adriatic Sea

Acta Adriatica, Год журнала: 2024, Номер 65(1), С. 75 - 121

Опубликована: Янв. 1, 2024

The Adriatic Sea is one of the Mediterranean areas most exposed to cumulative human stressors. This semienclosed and largely shallow basin has been subjected intensive exploitation destructive fishing practices for decades, resulting in biodiversity decline poor ecosystem health. Diversity cetaceans lower than other parts Mediterranean, extant dolphins whales have facing threats that include combined effects habitat loss degradation, prey depletion, incidental mortality injury caused by fisheries, anthropogenic noise, chemical contamination climate change. Here, we report information nine cetacean species known occur (classified as either regular, visitor or vagrant), plus three characterized a single record. For these species, review evidence from field research studies – with bias towards common bottlenose dolphin Tursiops truncatus (by far intensively-studied this area). We also describe characterize main Adriatic, relying on recent literature well historical helps frame present status context past impacts (particularly extensive killing campaigns conducted until 1960s). Finally, provide management recommendations inform guide action must be taken compliance legislation, marine conservation directives international commitments protect biodiversity.

Язык: Английский

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Application of multi-species photo-ID database management systems: a user’s perspective

Mammalian Biology, Год журнала: 2022, Номер 102(4), С. 1619 - 1629

Опубликована: Авг. 1, 2022

Язык: Английский

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Electric boat underwater radiated noise and its potential impact on species of conservation interest

Marine Pollution Bulletin, Год журнала: 2023, Номер 199, С. 115937 - 115937

Опубликована: Дек. 26, 2023

Electric boats are thought to be noiseless, but in-situ measurements generally rare. The Underwater Radiated Noise (URN) of 8-m Trimaran Pontoon Boat with two outboard electric engines was measured in the Miramare Marine Protected Area (Trieste, Italy), together URN a fibreglass 5-m boat, gasoline engine, for comparisons. International standards and guidelines shallow waters were considered. provided one-third octave band narrow spectra. boat produced low input underwater noise at frequencies. Given low-frequency hearing sensitivity, listening space reduction (LSR) lower when generated by than combustion engine brown meagre, local Teleost fish. No difference found bottlenose dolphin LSR although continuous, tonal, high frequency components expected highly detrimental dolphin.

Язык: Английский

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