Determinants of group size in the common bottlenose dolphins: the role of water temperature and noise

Manna, Gianfranco La; Ronchetti, Fabio; Perretti, Francesco; Ceccherelli, Giulia

doi:10.1007/s00265-023-03322-w

Cited by 2 publications

(3 citation statements)

References 68 publications

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“…At the end, SSTm also influenced dolphin distribution, mainly in summer, when higher SSTm reduced the likelihood of dolphin presence. The importance of SST in defining dolphin distribution is coherent with recent studies conducted in other geographical areas ( Hartel, Constantine & Torres, 2014 ; La Manna, Ronchetti & Sarà, 2016 ; Lambert et al, 2017 ) and with the strong influence of warming and marine heat waves on the occurrence, home range and group size recently found in the same dolphin population ( La Manna et al, 2023a ; La Manna et al, 2023b ). SSTm in 2022 was between 1.19 °C and 1.38 °C higher than the average SSTm recorded in the period 2015–2018 ( La Manna et al, 2020 ).…”

Section: Discussionsupporting

confidence: 88%

“…For example, the distribution of dolphins during the winter months, when sea-based tourist activities cease and fishing reduce due to adverse weather conditions, as well as the influence of different behavioral states (feeding, socializing, resting) on the selection of habitats ( Giannoulaki et al, 2017 ) should be investigated. Finally, considering that marine mammals respond to climate change ( Silber Gregory et al, 2017 ), and early indications on the effect of temperature on the studied population have already been found ( La Manna et al, 2023a ; La Manna et al, 2023b ), further effort should be done to anticipate changes in occurrence, distribution, and relative abundance of this population under climate change scenarios.…”

Section: Discussionmentioning

confidence: 99%

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Areas of spatial overlap between common bottlenose dolphin, recreational boating, and small-scale fishery: management insights from modelling exercises

La Manna,

Ronchetti,

Perretti

et al. 2023

PeerJ

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Background Sustainable management requires spatial mapping of both species distribution and human activities to identify potential risk of conflict. The common bottlenose dolphin (Tursiops truncatus) is a priority species of the European Union Habitat Directive, thus, to promote its conservation, the understanding of habitat use and distribution, as well as the identification and spatial trend of the human activities which may directly affect populations traits, is pivotal. Methods A MaxEnt modeling approach was applied to predict the seasonal (from April to September) habitat use of a small population of bottlenose dolphins in the north-western Sardinia (Mediterranean Sea) in relation to environmental variables and the likelihoods of boat and fishing net presence. Then, the overlapping areas between dolphin, fishing net and boat presence were identified to provide insights for the marine spatial management of this area. Results Three of the main factors influencing the seasonal distribution of bottlenose dolphins in the area are directly (boating and fishing) or indirectly (ocean warming) related to human activities. Furthermore, almost half of the most suitable area for dolphins overlapped with areas used by fishing and boating. Finally, relying on fishing distribution models, we also shed light on the potential impact of fishing on the Posidonia oceanica beds, a protected habitat, which received higher fishing efforts than other habitat types. Discussion Modelling the spatial patterns of anthropogenic activities was fundamental to understand the ecological impacts both on cetacean habitat use and protected habitats. A greater research effort is suggested to detect potential changes in dolphin habitat suitability, also in relation to ocean warming, to assess dolphin bycatch and the status of target fish species, and to evaluate sensitive habitats conditions, such as the Posidonia oceanica meadow.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Areas of spatial overlap between common bottlenose dolphin, recreational boating, and small-scale fishery: management insights from modelling exercises

La Manna,

Ronchetti,

Perretti

et al. 2023

PeerJ

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“…In addition, the size of groups that are large or widely scattered may be difficult to estimate visually, and sampling protocols and methods can differ substantially: these differences can hamper comparisons among studies and areas. Dolphin group size is influenced by a number of factors, including habitat type, oceanographic and climate conditions, prey kind and availability, predation risk, presence of calves, social factors, behaviour, and noise (Bearzi et al, 1997(Bearzi et al, , 1999Gygax, 2002;Genov et al, 2019a;Pleslić et al, 2021;La Manna et al, 2023;Methion et al, 2023). In the Kvarnerić region, Croatia, groups engaged in social activities were significantly larger than travelling groups, and these were larger than groups performing feeding dives (Bearzi et al, 1999).…”

Section: Group Sizementioning

confidence: 99%

Whales and dolphins of the Adriatic Sea

Bearzi,

Bonizzoni,

Genov

et al. 2024

Acta Adriat. (Online)

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

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Determinants of group size in the common bottlenose dolphins: the role of water temperature and noise

Cited by 2 publications

References 68 publications

Areas of spatial overlap between common bottlenose dolphin, recreational boating, and small-scale fishery: management insights from modelling exercises

Areas of spatial overlap between common bottlenose dolphin, recreational boating, and small-scale fishery: management insights from modelling exercises

Whales and dolphins of the Adriatic Sea

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