The structure of a bottlenose dolphin society is coupled to a unique foraging cooperation with artisanal fishermen

Daura‐Jorge, Fábio G.; Cantor, Maurício; Ingram, Simon; Lusseau, David; Simões‐Lopes, Paulo C.

doi:10.1098/rsbl.2012.0174

Cited by 118 publications

(92 citation statements)

References 12 publications

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“…Different mechanisms drive the modular structure of a social network and detecting them is critical for understanding the forces driving social patterns (e.g. Lusseau et al 2006;Wolf et al 2007;Wiszniewski et al 2009;Daura-Jorge et al 2012). From our major finding, the modular structure gave rise to a challenging question: how much of this structure could be explained by social processes?…”

Section: Discussionmentioning

confidence: 87%

“…We compared the mean observed values (individual range and core area overlap; proportion of individuals per period) within and between modules to the 95% CI of null distributions of individuals randomly assigned to modules (1000 iterations), while constraining module size (e.g. Daura-Jorge et al 2012). With the same approach, we further tested the temporal effect by comparing the HWI (Supplementary Data S3) and two local network properties (shortest path length and centrality; Supplementary Data S4) between the different classes of sighting periods.…”

Section: Social Network Topologymentioning

confidence: 99%

“…There is increasing evidence showing that decoding the structure of such a social network is an effective approach for unravelling the underlying processes organizing an animal society (e.g. Lusseau 2003;Croft et al 2008;Foster et al 2012;Mourier et al 2012;Daura-Jorge et al 2012).…”

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confidence: 99%

“…Frère et al 2010;Wiszniewski et al 2010), foraging specializations (e.g. Daura-Jorge et al 2012), habitat utilization (e.g. Wiszniewski et al 2009), or local ecological conditions (e.g.…”

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confidence: 99%

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Disentangling social networks from spatiotemporal dynamics: the temporal structure of a dolphin society

et al. 2012

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Section: Discussionmentioning

confidence: 87%

Section: Social Network Topologymentioning

confidence: 99%

mentioning

confidence: 99%

“…Frère et al 2010;Wiszniewski et al 2010), foraging specializations (e.g. Daura-Jorge et al 2012), habitat utilization (e.g. Wiszniewski et al 2009), or local ecological conditions (e.g.…”

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confidence: 99%

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Disentangling social networks from spatiotemporal dynamics: the temporal structure of a dolphin society

et al. 2012

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“…1 and 7). Such highly specialized cognitive skills are often unique to a particular population and have been shown across a range of social and cognitively advanced species, including a population of wild bottlenose dolphins in Brazil that use unique cultural knowledge and experience of human activities to engage in cooperative hunting with artisanal fisherman (31). The advantages associated with such marked behavioral adaptability are considerable and provide us with important insights into the evolutionary processes that may have selected for larger brain size (27).…”

Section: Resynthesized Maasai Female (E and F) And Maasi Male Vs Mamentioning

confidence: 99%

Elephants can determine ethnicity, gender, and age from acoustic cues in human voices

McComb

Shannon

Sayialel

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

127

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Animals can accrue direct fitness benefits by accurately classifying predatory threat according to the species of predator and the magnitude of risk associated with an encounter. Human predators present a particularly interesting cognitive challenge, as it is typically the case that different human subgroups pose radically different levels of danger to animals living around them. Although a number of prey species have proved able to discriminate between certain human categories on the basis of visual and olfactory cues, vocalizations potentially provide a much richer source of information. We now use controlled playback experiments to investigate whether family groups of free-ranging African elephants (Loxodonta africana) in Amboseli National Park, Kenya can use acoustic characteristics of speech to make functionally relevant distinctions between human subcategories differing not only in ethnicity but also in sex and age. Our results demonstrate that elephants can reliably discriminate between two different ethnic groups that differ in the level of threat they represent, significantly increasing their probability of defensive bunching and investigative smelling following playbacks of Maasai voices. Moreover, these responses were specific to the sex and age of Maasai presented, with the voices of Maasai women and boys, subcategories that would generally pose little threat, significantly less likely to produce these behavioral responses. Considering the long history and often pervasive predatory threat associated with humans across the globe, it is likely that abilities to precisely identify dangerous subcategories of humans on the basis of subtle voice characteristics could have been selected for in other cognitively advanced animal species.T he ability to recognize predators and assess the level of threat that they pose is a crucial cognitive skill for many wild animals that has very direct and obvious fitness consequences (1-5). Until recently, most research in this area focused on how a range of birds and mammals classify other animal predators, demonstrating complex abilities to differentiate between predators with different hunting styles and respond with appropriate escape tactics (2, 3, 6-8). However, for many wild populations, humans represent a significant predatory threat (5, 9, 10) and this threat is rapidly increasing as areas for wildlife decrease and humananimal conflict grows. Moreover, as it is typically the case that not all humans pose the same risk to prey species, distinguishing between different human subgroups to identify those associated with genuinely threatening situations could present a major cognitive challenge. The extent of behavioral flexibility that different species may exhibit in correctly classifying human predators-and the degree of sophistication possible in such abilities-is therefore of considerable interest.Most research on the abilities of animals to classify human predators has focused on discrimination through facial features or general differences in behavior and appear...

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Spatial behavioural response of coastal bottlenose dolphins to habitat disturbance in southern Brazil

Agrelo

Daura‐Jorge

Bezamat

et al. 2019

Aquatic Conservation

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A small population of coastal bottlenose dolphins (Tursiops truncatus gephyreus) inhabits the inland waters of Laguna, southern Brazil. A subset of this population interacts with artisanal fishermen. This specialized foraging tactic structures dolphin society into ‘cooperatives' (participants of the interaction) and ‘non‐cooperatives' (non‐participants). Between 2012 and 2015, a bridge was constructed in Laguna over an important core area for dolphins. Photo‐identification and georeferenced data collected on boat surveys, conducted both before and during bridge construction, were used to evaluate changes in both ‘cooperative' and ‘non‐cooperative' dolphin distribution. Changes in dolphin distribution were analysed with kernel densities and hurdle models. A grid of 120 cells of area 1 km2 was used to model dolphin distribution, and the minimum distance from the grid cell centre to the bridge and to the area of gillnet use were defined as explanatory variables of human activities. Habitat descriptors (depth and distance) from the lagoon margin were also considered in the model procedure. Dolphin distribution patterns shifted between periods. A core area used by ‘non‐cooperative' dolphins near the bridge construction works disappeared. The effects of habitat descriptor and anthropogenic activity on dolphin distribution also differed between periods. Before bridge construction, the abundance of ‘non‐cooperative' dolphin was higher close to the bridge area (p < 0.05). During bridge construction, the presence of ‘cooperative' and ‘non‐cooperative' dolphins decreased significantly with the distance from gillnet fishing activity (p < 0.01 and p < 0.001 respectively). This study highlights the importance of accounting for individual variations in response when assessing the effects of a habitat disturbance, or when implementing conservation plans.

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The structure of a bottlenose dolphin society is coupled to a unique foraging cooperation with artisanal fishermen

Cited by 118 publications

References 12 publications

Disentangling social networks from spatiotemporal dynamics: the temporal structure of a dolphin society

Disentangling social networks from spatiotemporal dynamics: the temporal structure of a dolphin society

Elephants can determine ethnicity, gender, and age from acoustic cues in human voices

Spatial behavioural response of coastal bottlenose dolphins to habitat disturbance in southern Brazil

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