scholarly journals The social structure of Golfo Dulce bottlenose dolphins ( Tursiops truncatus ) and the influence of behavioural state

2016 ◽  
Vol 3 (8) ◽  
pp. 160010 ◽  
Author(s):  
Kelsey Moreno ◽  
Alejandro Acevedo-Gutiérrez
Keyword(s):  
Social Structure ◽  
Bottlenose Dolphins ◽  
Ecological Factors ◽  
Mating Strategies ◽  
Behavioural Plasticity ◽  
Social Strategies ◽  
Behavioural State ◽  
The Social ◽  
Well Differentiated ◽  
Highly Correlated

Ecological factors such as habitat and food availability affect the social structure of bottlenose dolphins ( Tursiops spp.). Here, we describe the social structure of bottlenose dolphins ( T. truncatus ) in Golfo Dulce, Costa Rica, a semi-enclosed, fjord-like tropical embayment resembling a pelagic system. We also examine behaviour-linked social strategies by comparing social structure relative to behavioural state: feeding versus non-feeding. We analysed 333 sightings over 210 days from boat-based surveys. Despite the uniqueness of the area, the 47 analysed adults had a social structure similar to other populations: a well-differentiated fission–fusion society with sex-specific patterns of associations and aggression. These results indicate that differences in social structure relative to other populations were a matter of degree. Association strength of dyads was highly correlated across behavioural states, indicating constraints on social fluidity. Males displayed a marked difference in lagged association rate and females displayed a small difference in association homogeneity between states. We suggest this difference in population-wide social connections between behavioural states, particularly for males, was due to mating strategies, a pressure which is strongest during non-feeding behaviour and relaxed during feeding. This finding highlights the importance of considering behavioural state when examining individual bonds and the behavioural plasticity for which the bottlenose dolphin is well known.

scholarly journals Genetic relatedness delineates the social structure of southern Australian bottlenose dolphins

2019 ◽  
Vol 30 (4) ◽  
pp. 948-959 ◽  
Author(s):  
Fernando Diaz-Aguirre ◽  
Guido J Parra ◽  
Cecilia Passadore ◽  
Luciana Möller
Keyword(s):  
Social Structure ◽  
Genetic Relatedness ◽  
Social Systems ◽  
Bottlenose Dolphins ◽  
South Australia ◽  
Intrinsic Factors ◽  
Photo Identification ◽  
The Social ◽  
Modularity Analysis ◽  
Network Metrics

AbstractSocial relationships represent an adaptive behavioral strategy that can provide fitness benefits to individuals. Within mammalian societies, delphinids are known to form diverse grouping patterns and show a variety of social systems. However, how ecological and intrinsic factors have shaped the evolution of such diverse societies is still not well understood. In this study, we used photo-identification data and biopsy samples collected between March 2013 and October 2015 in Coffin Bay, a heterogeneous environment in South Australia, to investigate the social structure of southern Australian bottlenose dolphins (Tursiops cf. australis). Based on the data from 657 groups of dolphins, we used generalized affiliation indices, and applied social network and modularity methods to study affiliation patterns among individuals and investigate the potential presence of social communities within the population. In addition, we investigated genetic relatedness and kinship relationships within and between the communities identified. Modularity analysis revealed that the Coffin Bay population is structured into 2 similar sized, mixed-sex communities which differed in ranging patterns, affiliation levels and network metrics. Lagged association rates also indicated that nonrandom affiliations persisted over the study period. The genetic analyses suggested that there was higher relatedness, and a higher proportion of inferred full-sibs and half-sibs, within than between communities. We propose that differences in environmental conditions between the bays and kinship relationships are important factors contributing to the delineation and maintenance of this social structure.

The Social Structure of Free-Ranging Bottlenose Dolphins

1987 ◽  
pp. 247-305 ◽  
Author(s):  
Randall S. Wells ◽  
Michael D. Scott ◽  
A. Blair Irvine
Keyword(s):  
Social Structure ◽  
Bottlenose Dolphins ◽  
The Social ◽  
Free Ranging

THE SOCIAL STRUCTURE OF BOTTLENOSE DOLPHINS, TURSIOPS TRUNCATUS, IN THE BAHAMAS

2004 ◽  
Vol 20 (4) ◽  
pp. 688-708 ◽  
Author(s):  
Cindy A. Rogers ◽  
Barbara J. Brunnick ◽  
Denise L. Herzing ◽  
John D. Baldwin
Keyword(s):  
Social Structure ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
The Bahamas ◽  
The Social

scholarly journals The importance of delineating networks by activity type in bottlenose dolphins ( Tursiops truncatus ) in Cedar Key, Florida

2015 ◽  
Vol 2 (3) ◽  
pp. 140263 ◽  
Author(s):  
Stefanie Gazda ◽  
Swami Iyer ◽  
Timothy Killingback ◽  
Richard Connor ◽  
Solange Brault
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Spatial Association ◽  
Population Level ◽  
Activity Type ◽  
Behavioural State ◽  
Activity Networks ◽  
Behavioural Patterns ◽  
The Social ◽  
Large Groups

Network analysis has proved to be a valuable tool for studying the behavioural patterns of complex social animals. Often such studies either do not distinguish between different behavioural states of the organisms or simply focus attention on a single behavioural state to the exclusion of all others. In either of these approaches it is impossible to ascertain how the behavioural patterns of individuals depend on the type of activity they are engaged in. Here we report on a network-based analysis of the behavioural associations in a population of bottlenose dolphins ( Tursiops truncatus ) in Cedar Key, Florida. We consider three distinct behavioural states—socializing, travelling and foraging—and analyse the association networks corresponding to each activity. Moreover, in constructing the different activity networks we do not simply record a spatial association between two individuals as being either present or absent, but rather quantify the degree of any association, thus allowing us to construct weighted networks describing each activity. The results of these weighted activity networks indicate that networks can reveal detailed patterns of bottlenose dolphins at the population level; dolphins socialize in large groups with preferential associations; travel in small groups with preferential associates; and spread out to forage in very small, weakly connected groups. There is some overlap in the socialize and travel networks but little overlap between the forage and other networks. This indicates that the social bonds maintained in other activities are less important as they forage on dispersed, solitary prey. The overall network, not sorted by activity, does not accurately represent any of these patterns.

scholarly journals Behaviourally specific preferred associations in bottlenose dolphins, Tursiops spp.

2005 ◽  
Vol 83 (12) ◽  
pp. 1566-1573 ◽  
Author(s):  
S Gero ◽  
L Bejder ◽  
H Whitehead ◽  
J Mann ◽  
R C Connor
Keyword(s):  
Social Relationships ◽  
Bottlenose Dolphins ◽  
Adult Males ◽  
Short Term ◽  
Shark Bay ◽  
Behavioural State ◽  
The Social ◽  
Association Group ◽  
Males And Females ◽  
Free Ranging

We investigated association patterns of 52 photographically identified, free-ranging bottlenose dolphins (Tursiops spp. Gervais, 1855) across four behavioural states (rest, travel, social, and foraging/feeding) to investigate how behavioural state influences patterns of association. Group composition and behavioural data were extracted from 2178 encounter surveys collected over 3 years. Analyses revealed three general types of association: (1) affiliates, which consistently demonstrate preferred associations across all behavioural states; (2) acquaintances, which never form preferred associations but still associate in at least one behavioural state; and (3) behavioural associates, which form preferred associations in at least one, but not all behavioural states. The majority of associations in Shark Bay, Australia, are acquaintance type (38.2%), with affiliates (5.7%, principally between adult males) and behavioural associates (28.9%, principally between juveniles) being relatively rarer. Permutation tests identified behaviourally specific preferred associations during all behavioural states. Although behaviourally specific preferred associations appear to exist within the Shark Bay social structure, it seems that the social organization and mating system constrain the social relationships for the majority of males and females in differing ways which prevent them from having behavioural associates, leaving juveniles free to associate based on short-term expediency and behavioural specific needs.

scholarly journals The interplay between social networks and culture: theoretically and among whales and dolphins

2013 ◽  
Vol 368 (1618) ◽  
pp. 20120340 ◽  
Author(s):  
Mauricio Cantor ◽  
Hal Whitehead
Keyword(s):  
Social Learning ◽  
Social Structure ◽  
Network Topology ◽  
Foraging Behaviour ◽  
Bottlenose Dolphins ◽  
Social Structures ◽  
Cultural Symbols ◽  
Begging Behaviour ◽  
Specific Behaviour ◽  
The Social

Culture is increasingly being understood as a driver of mammalian phenotypes. Defined as group-specific behaviour transmitted by social learning, culture is shaped by social structure. However, culture can itself affect social structure if individuals preferentially interact with others whose behaviour is similar, or cultural symbols are used to mark groups. Using network formalism, this interplay can be depicted by the coevolution of nodes and edges together with the coevolution of network topology and transmission patterns. We review attempts to model the links between the spread, persistence and diversity of culture and the network topology of non-human societies. We illustrate these processes using cetaceans. The spread of socially learned begging behaviour within a population of bottlenose dolphins followed the topology of the social network, as did the evolution of the song of the humpback whale between breeding areas. In three bottlenose dolphin populations, individuals preferentially associated with animals using the same socially learned foraging behaviour. Homogeneous behaviour within the tight, nearly permanent social structures of the large matrilineal whales seems to result from transmission bias, with cultural symbols marking social structures. We recommend the integration of studies of culture and society in species for which social learning is an important determinant of behaviour.

Social structure of bottlenose dolphins, Tursiops truncatus, in Panama City, Florida

2010 ◽  
Vol 90 (8) ◽  
pp. 1685-1692 ◽  
Author(s):  
Th. Bouveroux ◽  
J. Mallefet
Keyword(s):  
Social Structure ◽  
Social Organization ◽  
Bottlenose Dolphins ◽  
Mantel Test ◽  
Panama City ◽  
North West ◽  
Multiple Networks ◽  
The North ◽  
The Social ◽  
Dolphin Population

Social organization is an important attribute of the animal society. We describe the social structure of a bottlenose dolphins population living in Panama City, a seaside resort located on the north-west coast of Florida. Study was conducted with 46 individuals. Dolphins are associated on average half weight index of 0.11. Preferred long-term associations are observed. The proportion of the non-zero association indices suggests that some dolphins seem to avoid others. Associations between and within sex-classes were investigated using only dolphins of known sex and observed at least 4 times. Highly significant differences are found in associations between and within sex-classes (Mantel test, t = 3.7987; P = 1); indeed, male associations are stronger than between inter-sexual associations or between females only. Sociogram of males reveals a complex network with strong associations between pairs or trios that reach up to 0.97, whereas female associations are lower than males. The cluster analysis shows no clear division in the social organization of bottlenose dolphins in Panama City, except for dyads, triads and their multiple networks. The population structure seems to be temporally stable over the study and constant companionships are observed in the dolphin population in Panama City.

Evaluating the influence of ecology, sex and kinship on the social structure of resident coastal bottlenose dolphins

2018 ◽  
Vol 165 (5) ◽  
Author(s):  
Marie Louis ◽  
Benoit Simon-Bouhet ◽  
Amélia Viricel ◽  
Tamara Lucas ◽  
François Gally ◽  
...  
Keyword(s):  
Social Structure ◽  
Bottlenose Dolphins ◽  
The Social

Silence and Sound in Black Girl Utopia

2017 ◽  
Vol 6 (3) ◽  
pp. 90-97
Author(s):  
Alexis Pauline Gumbs
Keyword(s):  
Social Structure ◽  
Black Girl ◽  
The Social ◽  
Mind And Body ◽  
Definition Of ◽  
Tone Deaf ◽  
At Home

Ladeedah is an audio novella that takes place in a Black utopic space after “the improvised revolution.” Ladeedah is a tone-deaf, rhythm-lacking Black girl in a world where everyone dances and sings at all times. What is Ladeedah's destiny as a quiet, clumsy genius in a society where movement and sound are the basis of the social structure and the definition of freedom? This excerpt from Ladeedah focuses on Ladeedah's attempts to understand the meaning of revolution from her own perspectives—at home, at school, and in her own mind and body.

THE HIMYARITE KINGDOM ON THE EVE OF AND AFTER THE ETHIOPIAN DOMINANCE IN THE SIXTH CENTURY A.D. IN THE MARTYRDOM OF ST. ARETHAS AND HIS COMPANIONS AND IN THE ACTS OF ST. GREGENTIUS

2017 ◽  
Vol 24 (2) ◽  
pp. 678-700
Author(s):  
V Christides
Keyword(s):  
Social Structure ◽  
Red Sea ◽  
Present Author ◽  
Sixth Century ◽  
South Arabia ◽  
The Social ◽  
Preliminary Study

Based on two important hagiographical works written in Greek, the Martyrdom of St. Arethas and his companions and the Acts of St. Gregentius, the aim of this paper is to continue my preliminary study of the countries around the Red Sea in pre-Islamic times, especially in the sixth century A.D. The most valuable information in the Martyrdom concerns the hazardous voyage of the Ethiopian army from the main port of Adulis across the Red Sea to South Arabia (ca 525 A.D.). This work illuminates aspects of that expedition which do not appear in such detail in any other source. In addition, it describes the ports of the Red Sea in the sixth century, i.e., Klysma, Bereniki, Adulis, etc., corroborating the finds of archaeology and epigraphy. Concerning the controversial Acts of St. Gregentius, the present author has tried to discuss only some vital information reflecting the social structure of South Arabia during its Ethiopian occupation until the Persian conquest of it (ca 525 A.D. – ca 570 A.D.), and attempted to trace the origin of just one law (the treatment of animals) among those supposedly imposed on the Himyarites by the so-called archbishop Gregentius.

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