Marine aquaculture and bottlenose dolphins’ (Tursiops truncatus) social structure

López, Bruno Díaz; Shirai, Julia Andrea Bernal

doi:10.1007/s00265-007-0512-1

Cited by 58 publications

(42 citation statements)

References 41 publications

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“…Additionally, human activities influence the distribution of food resources and dolphins behaviour (Díaz López, 2006a,b;Díaz López, 2009), which promote the evolution of social organizations (Díaz López and Shirai, 2008) and individual preferences for the area (Díaz López and Shirai, 2007).…”

Section: Introductionmentioning

confidence: 99%

Whistle characteristics in free-ranging bottlenose dolphins (Tursiops truncatus) in the Mediterranean Sea: Influence of behaviour

López¹

2011

Mammalian Biology

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a b s t r a c tBottlenose dolphins (Tursiops truncatus) are an extremely vocal mammalian species and vocal communication plays an important role in mediating social interactions. Very little is known about how wild bottlenose dolphins use whistles in different contexts and no data exist for context specificity of whistle characteristics. This study describes, for the first time in the Mediterranean Sea, the whistle characteristics of bottlenose dolphins in their natural repertoire. Over 35 h of behavioural observations and simultaneous recordings, 3032 tonal, frequency modulated whistles were detected. Our findings further support, for the first time in wild bottlenose dolphins, the suggestion that acoustic features may be good predictors of behavioural state and vice versa. These results advocate that these parameters may be used to communicate specific information on the behavioural context of the individuals involved. Additionally, visual inspection reveals that upsweeps and multi-looped whistles play an important role in the natural communication system of bottlenose dolphins. Likewise, this study demonstrates how dynamic bottlenose dolphin whistle characteristics are and how important it is to consider many factors in analysis. High intra-specific variability in whistle characteristics demonstrates its integral role in the complex social lives of wild bottlenose dolphins.

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Section: Introductionmentioning

confidence: 99%

Whistle characteristics in free-ranging bottlenose dolphins (Tursiops truncatus) in the Mediterranean Sea: Influence of behaviour

López¹

2011

Mammalian Biology

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“…Similarly, the seafood farms located within the study area are all small and their potential for eutrophication, sedimentation, and other direct impacts on the local food web is thus likely to be minor. Even so, negative interactions between dolphins and aquaculture operations have been reported for the Chilean dolphin, Cephalorhynchus eutropia , at Chiloé Island, in southern Chile (Ribeiro, Viddi, Cordeiro, & Freitas, ) and the bottlenose dolphin, Tursiops truncatus , off Sardinia, in Italy (Diaz‐López & Shirai, ). In Ilha Grande Bay, Guiana dolphin was more likely to occur at distances of up to 3 km from seafood farms, which may attract potential prey and, in turn, the dolphins.…”

Section: Discussionmentioning

confidence: 99%

Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

Tardin

Maciel

Espécie

et al. 2020

Aquatic Conservation

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1. Species distribution modelling has been used to identify critical habitats for the delimitation of Marine Protected Areas. Although Marine Protected Areas may often overlap with the distribution of key marine species, illegal human activities often continue within these areas, causing negative impacts on the local biodiversity. 2. A generalized linear model with spatial eigenvector mapping was used to investigate, for the first time, the influence of environmental variables and anthropic activities on the number of Guiana dolphin, Sotalia guianensis sightings/grid, and to determine whether a Marine Reserve, in south-eastern Brazil, is adequate for the protection of the local population. Data were collected between May 2007 and October 2013 onboard a 7.5-m vessel with an inboard engine.3. The models for the different periods (annual, dry, and rainy seasons) all indicated that depth, the distance to seafood farms and fishing grounds, and mean sea surface temperatures influenced the distribution of the dolphins within the study area. The annual and seasonal models predicted that the dolphins prefer a continuous area between Cedro and Pico Islands, a large area that lies outside the limits of the Marine Reserve. 4. Although the habitat of Ilha Grande bay is still much less degraded than that inhabited by other nearby Guiana dolphin populations, the results of the present study indicate that anthropic activities in this area influence habitat use by the dolphins. Less than 30% of the area used by the dolphins is protected by the Tamoios Ecological Station (ESEC Tamoios). 5. Sotalia guianensis is classified as 'Vulnerable' in Brazil, although the marine reserve (ESEC Tamoios) does not protect the core area used by the local dolphin population. The results of the present study provide specific locations for the creation of a new multiple-use MPA, as suggested by the Brazilian National Action Plan for the Conservation of Small Cetaceans, or the inclusion of a special management programme for the area between Cedro and Pico islands to better protect the dolphins in the ESEC Tamoios buffer zone. The continuation of surveys to better

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“…Further empirical evidence for the initial emergence of foraging groups can also be drawn from studies of specializations on anthropogenic resources. Examples of groups of social animals exploiting human‐derived food patches abound: Bears exploit garbage (Mccarthy & Seavoy, ), and elephants and chimpanzees depredate crops (Chiyo, Moss, & Alberts, ; Hockings, Anderson, & Matsuzawa, ), while dolphins associate with aquaculture farming (Díaz‐López & Shirai, ), beg food from anglers (Donaldson, Finn, Bejder, Lusseau, & Calver, ; Powell & Wells, ), and interact with artisanal and commercial fisheries (Daura‐Jorge, Cantor, Ingram, Lusseau, & Simões‐Lopes, ; Kovacs, Perrtree, & Cox, ). Two particular cases of cetaceans foraging around fisheries indicate how the initial motivation to lessen intrapopulation competition by specializing on a resource can also have social consequences, in line with the predictions of our model.…”

Section: Discussionmentioning

confidence: 99%

Simple foraging rules in competitive environments can generate socially structured populations

Cantor

Farine

2018

Ecology and Evolution

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Social vertebrates commonly form foraging groups whose members repeatedly interact with one another and are often genetically related. Many species also exhibit within‐population specializations, which can range from preferences to forage in particular areas through to specializing on the type of prey they catch. However, within‐population structure in foraging groups, behavioral homogeneity in foraging behavior, and relatedness could be outcomes of behavioral interactions rather than underlying drivers. We present a simple process by which grouping among foragers emerges and is maintained across generations. We introduce agent‐based models to investigate (1) whether a simple rule (keep foraging with the same individuals when you were successful) leads to stable social community structure, and (2) whether this structure is robust to demographic changes and becomes kin‐structured over time. We find the rapid emergence of kin‐structured populations and the presence of foraging groups that control, or specialize on, a particular food resource. This pattern is strongest in small populations, mirroring empirical observations. Our results suggest that group stability can emerge as a product of network self‐organization and, in doing so, may provide the necessary conditions for the evolution of more sophisticated processes, such as social learning. This taxonomically general social process has implications for our understanding of the links between population, genetic, and social structures.

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Marine aquaculture and bottlenose dolphins’ (Tursiops truncatus) social structure

Cited by 58 publications

References 41 publications

Whistle characteristics in free-ranging bottlenose dolphins (Tursiops truncatus) in the Mediterranean Sea: Influence of behaviour

Whistle characteristics in free-ranging bottlenose dolphins (Tursiops truncatus) in the Mediterranean Sea: Influence of behaviour

Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

Simple foraging rules in competitive environments can generate socially structured populations

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