scholarly journals Third-party vocal intervention in the proboscis monkey (Nasalis larvatus)

2022 ◽  
Author(s):  
Marina Scheumann ◽  
Kathrin M. Röper ◽  
Senthilvel K. S. S. Nathan ◽  
Benoit Goossens
Keyword(s):  
Adult Male ◽  
Third Party ◽  
Direct Access ◽  
Proboscis Monkey ◽  
Adult Males ◽  
Third Party Intervention ◽  
Group Members ◽  
Video And Audio ◽  
Lower Kinabatangan ◽  
Free Ranging

AbstractVocal intervention is a triadic social interaction, where a third party responds vocally to a conflict between group members, minimizing the costs of aggression in response to the intervention. Because there is little information on vocal third-party intervention in nonhuman mammals, we investigated whether adult male proboscis monkeys use the bray vocalization as a vocal third-party intervention signal to intervene in intragroup conflicts. First, we audio-recorded 1,811 vocalizations from 17 free-ranging proboscis monkey groups in the Lower Kinabatangan Wildlife Sanctuary, analyzing 378 vocal responses of the adult male to agonistic vocal exchanges (shrieks) of group members. Second, we video- and audio-recorded five habituated groups in the Labuk Bay Proboscis Monkey Sanctuary investigating the context of these vocalizations and the conflict dyads evoking vocal support. We found that adult males of one-male/multifemale groups mainly uttered bray vocalizations, whereas females, immatures, and infants uttered shrieks in intragroup conflicts or in response to other animal species. The adult male uttered significantly more often brays after agonistic shrieks than expected based on the overall occurrence of brays. Brays ended 65% of agonistic conflicts, which were accompanied by vocalizations of the conflict partners and occurred more often after conflicts between females than between offspring. This suggests that the bray functions as a vocal third-party intervention signal for intragroup conflict resolution. We suggest that living in the high canopies of the tropical rainforest might restrict direct access to conflict partners and prevent physical intervention, favoring the evolution of the bray as a third-party vocal intervention signal.

scholarly journals Neutering Effects on Social Behaviour of Urban Unowned Free-Roaming Domestic Cats

Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1105 ◽  
Author(s):  
Simona Cafazzo ◽  
Roberto Bonanni ◽  
Eugenia Natoli
Keyword(s):  
General Level ◽  
Territorial Behaviour ◽  
Adult Males ◽  
Domestic Cats ◽  
Obvious Effect ◽  
Focal Animal ◽  
The Hierarchical Structure ◽  
Group Members ◽  
Marking Behaviour ◽  
Free Ranging

The “trap, spay/neuter, and release” programs to manage unowned free-roaming cat populations are diffused worldwide and they are largely advised even in countries where the suppression of unowned cats is enforced by law. Despite the massive neutering campaigns in the world, there is little information on the influence of neutering on individual cat behaviour, as well as on the social structure of cat colonies. The aim of this study is to verify such effects. Before neutering, the group consisted of 17 free-roaming domestic cats, who were totally unrestrained. After neutering it consisted of 16 individuals. Data on the outcomes of aggressive, submissive, affiliative, and territorial behaviour were collected, using classic ethological methods (“focal animal”, “all occurrences”, and “1/0” sampling methods) (735 h of observation before and 537 h after neutering). The dominance hierarchy did not change after neutering. On the other hand, the frequency of aggressive, territorial behaviour as well as proximity among individuals decreased significantly. Affiliative behaviour has been observed among neutered adult males that never performed it before neutering. The results of this study suggest that, after neutering: (i) The group of free-ranging cats was stable over time; (ii) the hierarchical structure of the cat social group did not change; (iii) the general level of activity, decreased; (iv) urine spraying marking behaviour almost disappeared; (v) the level of social proximity among group members decreased, although it tended to increase in some male–male dyads. The most obvious effect of neutering, detected on individual behaviour, was that cats were less active.

Function and Meaning of Wild Gorilla 'Close' Calls

Behaviour ◽  
1996 ◽  
Vol 133 (11-12) ◽  
pp. 827-845 ◽  
Author(s):  
A.H. Harcourt ◽  
K.J. Stewart
Keyword(s):  
Social Interactions ◽  
Adult Male ◽  
Dominance Rank ◽  
Adult Males ◽  
Social Significance ◽  
The Social ◽  
Future Activity ◽  
Close Call ◽  
Contact Calls ◽  
Group Members

We investigate the social significance of the within group ('close') calls of gorillas by examining correlates of calling with dominance rank and with relatedness of adults, and by examining whether the outcomes of interactions between adults differ depending on the calls given during the interactions. In two wild gorilla groups, the majority of adults give most of their calls when near another adult and fully in sight of them. Thus gorillas' use 'close' calls as more than mere contact calls. An adult gorilla's use of 'close' calls correlates with its own and with its partner's dominance rank, with effects being most obvious for the most dominant animals, the fully adult males. Thus the proportion of 'double grunts', the most common 'close' call, in an individual's repertoire correlated consistently with dominance rank; all non-silverback adults gave a higher percent of double grunts in the presence of subordinates than they did near dominant animals; individuals were most likely to give 'non-syllabled' grunts in the adult male's presence; and they consistently exchanged calls at a higher rate with the adult males than with other group members. An adult's type of calls did not obviously differ depending on whether their neighbour was kin or non-kin, but kin were overall more likely to give calls in the presence of kin, and to exchange calls with kin than with non-kin, although the association was not consistent throughout the two years of the study. With regard to the consequences of calling, subordinates were less likely to be feeding one minute after an approach by a fully adult male during which calls were exchanged than during silent approaches. In contrast to findings from studies of some other species, calling did not correlate with duration of grooming. We suggest that, among other functions, gorillas' 'close' calls mediate social interactions. One form of calls, 'non-syllabled' calls, are interpretable as appeasement signals. The broadest interpretation of the 'double grunt' is that it is an exaggerated announcement of presence, whose function is to attract attention to the caller, and to signal conditional future activity.

scholarly journals BEHAVIORAL SYNCHRONY IN IBEX GROUPS: EFFECTS OF AGE, SEX AND HABITAT

Behaviour ◽  
2001 ◽  
Vol 138 (8) ◽  
pp. 1033-1046 ◽  
Author(s):  
Kathreen Ruckstuhl ◽  
Peter Neuhaus
Keyword(s):  
Adult Male ◽  
Age Groups ◽  
Habitat Type ◽  
Adult Males ◽  
Activity Budgets ◽  
Male Adult ◽  
Sex Structure ◽  
Movement Rates ◽  
Hard Time ◽  
Group Members

AbstractSynchrony of activities is usually high in foraging groups, possibly to maintain group cohesion. Individuals with different levels of activity budgets, however, may have a hard time synchronizing their behavior to each other without incurring a cost. We predicted that the age and sex structure of a group would affect synchronization levels within a group because of differing individual activity budgets. Individuals in same-sex-age groups were hypothesized to show higher levels of activity synchrony than individuals in mixed sex-age groups. We investigated activity synchrony in adult male, adult female, subadult, and mixed sex-age groups of Alpine ibex - one of the most sexually dimorphic ruminant species. Activity budgets and movement rates were measured to calculate synchrony of activities between group members in June and July 1999. Adult males were more synchronized with group peers than either females or subadults of both sexes. However, while adult males were synchronized in 81% when in bachelor (adult male) groups, they were only synchronized in 65% of the time when in mixed sex-age groups. Adult females were synchronized 61% of their time when in mixed sex-age groups and 69% when in female groups. Individual subadult males displayed higher synchrony when in bachelor or female groups than when in mixed sex-age or subadult mixed-sex groups. Subadult groups and mixed sex-age groups showed the lowest degree of synchrony of all group types. In general, animals in groups of same body-sized individuals were more synchronized with their group members than animals in mixed body-size groups. Two and three year-old males did not adjust their time spent lying to the group but their time spent walking. They also tended to change their time spent grazing and standing according to group type. Among subadults, females spent more time foraging than males but less time lying and standing. There was no difference in time spent walking. Bachelor and subadult groups had the greatest movement rates while female groups were relatively sedentary within escape terrain. Individuals in escape terrain did only marginally synchronize their behavior to each other likely because groups did not move much and synchrony was presumably less important. We conclude that habitat type, group movement rates, and a group's sex-age composition may affect the extent to which an individual will synchronize its activities to the other group members.

HAPTEN-RADIOIMMUNOASSAY OF PLASMA OESTRADIOL

1973 ◽  
Vol 72 (2) ◽  
pp. 330-344 ◽  
Author(s):  
Peter Doerr
Keyword(s):  
Adult Male ◽  
Normal Values ◽  
Normal Adult ◽  
Adult Males ◽  
Reagent Blank ◽  
Keyhole Limpet Haemocyanin ◽  
Ether Extraction ◽  
The Mean ◽  
Assay Precision ◽  
Plasma Oestradiol

ABSTRACT A hapten-radioimmunoassay for plasma oestradiol is described and information about the reliability of the method is given in detail. Oestradiol-3-hemisuccinate coupled to keyhole limpet haemocyanin is used for immunization of rabbits. The antiserum utilized for the assay is characterized by its titer, affinity and specificity. Following ether extraction and NaOH-light petroleum partition oestradiol is separated from crossreacting oestrogens by TLC. Oxidation of oestradiol on the plate is prevented by mercaptoethanol. To separate free and antibody bound ligand 250 μg dextran-coated charcoal per tube is used in the presence of bovine serum gammaglobulin (1 mg/ml). The between-assay precision based on 15 different determinations of control samples from normal adult male plasma was 9.4% (C. V.). The mean reagent blank value of 31 determinations was equivalent to 0.3 pg oestradiol and the detection limit in terms of the 99% confidence limit for a single blank value, was equivalent to 4.3 pg oestradiol. A procedure for detecting plasma blanks is described. Plasma oestradiol is separated from approximately all concomitant substances originally present in the sample by enzymatic conversion into oestrone and a second TLC. No plasma blanks could be detected with respect to normal adult male plasma. Normal values for adult males based on 51 subjects were characterized by a median of 17.2 pg/ml and the 95 percentiles of 9.5–27.6.

Children’s Group Biases In Third-Party Punishment Are Guided By Norms-Focused Behaviors

2020 ◽  
Author(s):  
Maria Luz Gonzalez-Gadea ◽  
Antonella Dominguez ◽  
Agustin Petroni
Keyword(s):  
Developmental Trajectories ◽  
Third Party ◽  
Controlled Processes ◽  
Group Members ◽  
Shed Light

Children tend to punish norm transgressions, even when they are mere external observers—a phenomenon known as third-party punishment. This behavior is influenced by group biases, as children unevenly punish in-group and out-group members.Two opposing hypotheses have been proposed to explain group biases during third-party punishment: the Norms-Focused Hypothesis predicts that individuals punish more harshly selfishness by in-group than by out-group members; contrarily, the Mere Preferences Hypothesis predicts that people are more lenient to selfishness by in-group than by out-group members. Here, we tested these hypotheses in children between six and 11 years of age (N=124) and explored the mechanisms underlying group biases during the development of third-party punishment. Our results supported the Norms-Focused Hypothesis: children preferentially punished unfair sharing from in-group members evidencing in-group policing bias, and they were also more willing to punish selfishness directed at in-group members than out-group members, showing in-group favoritism bias. We observed different developmental trajectories and mechanisms associated with these biases: while in-group policing remained stable over childhood as automatic as well as more effortful and controlled processes, in-group favoritism increases with age and was manifested only in the context of more controlled processes. These results shed light on the mechanisms underlying the development of third-party decisions and could be used to plan strategies and interventions to manipulate group biases in children.

Bonobo baby dominance: Did female defense of offspring lead to reduced male aggression?

2018 ◽  
Author(s):  
Kara Walker ◽  
Brian Hare
Keyword(s):  
Adult Male ◽  
Social System ◽  
Dominant Species ◽  
Potential Solution ◽  
Adult Males ◽  
Male Aggression ◽  
Dominance Style ◽  
The Social ◽  
Initial Support

The dominance style of bonobos presents an evolutionary puzzle. Bonobos are not male dominant but female bonobos do not show traits typical of female-dominant species. This chapter proposes the offspring dominance hypothesis (ODH) as a potential solution. ODH suggests the social system of bonobos evolved as a defence against infanticide and is not due to pressure to monopolize resources. Females that prevented aggression towards offspring and preferred mating with less aggressive males were most successful. Supporting ODH, during observations at Lola ya Bonobo Sanctuary it was found that: 1) adult male bonobos are rarely aggressive towards offspring with mothers, 2) some mother-reared juvenile bonobos attain rank higher than adult males and 3) mother-reared offspring often socially interact with adult males without their mothers nearby. These preliminary findings provide initial support that the bonobo social system evolved due to fitness advantages of effectively protecting offspring against consequences of male aggression. Le style de dominance des bonobos présente un puzzle évolutionnaire. Les bonobos ne sont pas dominés par les mâles mais les bonobos femelles ne montrent pas les traits caractéristiques d’une espèce dominée par femelles. On propose l’hypothèse de dominance de progéniture (ODH) comme une solution potentielle. La ODH suggère que le système social des bonobos a évolué en défense contre l’infanticide et pas sous pression pour la monopolisation des ressources. Les femelles qui préviennent l’agression vers leur progéniture et leur préférence d’accouplement avec des mâles moins agressives étaient très efficaces. À l’appui de la ODH on a trouvé pendant nos observations à Lola ya Bonobo Sanctuary que: 1) les mâles adultes bonobos agressent rarement vers les bébés avec mères, 2) quelques adolescents bonobos qui furent élevés par leurs mères atteignent un rang plus haut que les mâles adultes et 3) la progéniture élevée par la mère interagissent avec avec d’adultes mâles sans la présence de leur mère. Ces trouvailles préliminaires donnent appuie à l’hypothèse que le système social des bonobos a évolué par les avantages corporelles de la protection de la progéniture contre les conséquences de l’agression mâle.

scholarly journals Tibetan Macaques with Higher Social Centrality and More Relatives Emit More Frequent Visual Communication in Collective Decision-Making

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 876
Author(s):  
Zifei Tang ◽  
Xi Wang ◽  
Mingyang Wu ◽  
Shiwang Chen ◽  
Jinhua Li
Keyword(s):  
Visual Communication ◽  
Visual Signals ◽  
Communication Process ◽  
Tobit Regression ◽  
Communication Behaviors ◽  
Group Cooperation ◽  
Group Members ◽  
Group Sex ◽  
Free Ranging ◽  
Social Centrality

Animals on the move often communicate with each other through some specific postures. Previous studies have shown that social interaction plays a role in communication process. However, it is not clear whether the affinity of group members can affect visual communication. We studied a group of free-ranging Tibetan macaques (Macaca thibetana) at Huangshan Mountain, China, and answered whether and how social centrality or relatives matter in visual signals during group movement using Tobit regression modeling. All individuals emitted the signals of back-glances and pauses in collective movement. The emission of two signals decreased with the number of participants increased. The back-glance and pause signals emitted by the participating individuals were stronger as the position moved backward in the group. Sex, age, and rank had no significant influence on back-glance and pause signals. Individuals with higher social centrality would emit more pause signals, but social centrality had no effect on the back-glance signal. Individuals with more relatives in the group had more back-glance signals, but this had no effect on the pause signal. This study verifies that social centrality and the number of relatives have effects on visual signals in Tibetan macaques. We provide insights into the relationship between communication behaviors and group cooperation in social animals.

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