scholarly journals Proactive prosociality in a cooperatively breeding corvid, the azure-winged magpie ( Cyanopica cyana )

2016 ◽  
Vol 12 (10) ◽  
pp. 20160649 ◽  
Author(s):  
Lisa Horn ◽  
Clara Scheer ◽  
Thomas Bugnyar ◽  
Jorg J. M. Massen
Keyword(s):  
Cooperative Breeding ◽  
Cooperatively Breeding ◽  
Group Members ◽  
Over Time

One of the contemporary hypotheses concerning the evolution of human altruism is the cooperative breeding hypothesis (CBH) which has recently been tested in non-human primates. Using a similar paradigm, we investigated prosociality in a cooperatively breeding corvid, the azure-winged magpie. We found that the magpies delivered food to their group members at high rates, and unlike other corvids, they did so without any cues provided by others. In two control conditions, the magpies stopped participating over time, indicating that they learned to discriminate prosocial tests from controls. Azure-winged magpies are thus the first birds that experimentally show proactive prosociality. Our findings are in line with the CBH; however, additional corvid species need to be tested in this promising paradigm.

scholarly journals Group-size-dependent punishment of idle subordinates in a cooperative breeder where helpers pay to stay

2014 ◽  
Vol 281 (1789) ◽  
pp. 20140184 ◽  
Author(s):  
Stefan Fischer ◽  
Markus Zöttl ◽  
Frank Groenewoud ◽  
Barbara Taborsky
Keyword(s):  
Group Size ◽  
Small Groups ◽  
Cooperative Breeding ◽  
Breeding Systems ◽  
Idle Period ◽  
Cognitive Constraints ◽  
Size Dependent ◽  
Cooperatively Breeding ◽  
Group Members ◽  
Large Groups

In cooperative breeding systems, dominant breeders sometimes tolerate unrelated individuals even if they inflict costs on the dominants. According to the ‘pay-to-stay’ hypothesis, (i) subordinates can outweigh these costs by providing help and (ii) dominants should be able to enforce help by punishing subordinates that provide insufficient help. This requires that dominants can monitor helping and can recognize group members individually. In a field experiment, we tested whether cooperatively breeding cichlid Neolamprologus pulcher subordinates increase their help after a forced ‘idle’ period, how other group members respond to a previously idle helper, and how helper behaviour and group responses depend on group size. Previously idle helpers increased their submissiveness and received more aggression than control helpers, suggesting that punishment occurred to enforce help. Subordinates in small groups increased their help more than those in large groups, despite receiving less aggression. When subordinates were temporarily removed, dominants in small groups were more likely to evict returning subordinates. Our results suggest that only in small groups do helpers face a latent threat of punishment by breeders as predicted by the pay-to-stay hypothesis. In large groups, cognitive constraints may prevent breeders from tracking the behaviour of a large number of helpers.

scholarly journals Occurrence and Evolution of Cooperative Breeding Among the Diurnal Raptors (Accipitridae and Falconidae)

The Auk ◽  
2003 ◽  
Vol 120 (3) ◽  
pp. 717-729
Author(s):  
Rebecca T. Kimball ◽  
Patricia G. Parker ◽  
James C. Bednarz
Keyword(s):  
Cooperative Breeding ◽  
Group Living ◽  
Adult Males ◽  
Delayed Dispersal ◽  
Nest Sites ◽  
Cooperatively Breeding ◽  
Group Members ◽  
Species Groups ◽  
Related Individuals ◽  
Single Nest

Abstract Cooperative breeding, in which more than two individuals live in a group and raise offspring, usually in a single nest, is found in only 3% of avian species. On the basis of a review of the literature, we found reports of groups (usually trios) at nest sites in 42 species of diurnal raptors. At least one example of cooperative breeding was found in 29% of genera and 14% of species, distributed in both Accipitridae and Falconidae. Given the difficulty of obtaining behavioral observations necessary to detect cooperative breeding in most raptor species, combined with the large number of species that have been poorly studied, cooperative breeding in diurnal raptors may be more common than our data indicate. However, when data on the sex of the extra bird(s) or relationships among group members were available, patterns were quite varied. For 7 of 13 species, groups primarily contained multiple adult males, though three of those species also had groups formed from offspring that had delayed dispersal; three species had a low, but regular, occurrence of multiple females (females of groups laid eggs in the same nest); and the remaining three species were characterized by having extra birds that were yearlings or subadults. In over half of species, groups did not appear to be composed of related individuals, contrary to many cooperatively breeding passerine species where groups are primarily composed of offspring that have delayed dispersal. Our review suggests that the evolution of group living in many raptors may be independent of delayed dispersal, and that the factors important in explaining the evolution of that behavior depend upon the benefits of group living.

Cooperatively Breeding Groups of Carrion Crow(Corvus Corone Corone) in Northern Spain

The Auk ◽  
2002 ◽  
Vol 119 (3) ◽  
pp. 790-799 ◽  
Author(s):  
Vittorio Baglione ◽  
José M. Marcos ◽  
Daniela Canestrari
Keyword(s):  
Cooperative Breeding ◽  
Northern Spain ◽  
Juvenile Dispersal ◽  
Carrion Crow ◽  
Cooperatively Breeding ◽  
Corvus Corone ◽  
Group Members ◽  
Breeding Groups ◽  
Mode 3 ◽  
One Year

AbstractThe Carrion Crow (Corvus corone) is almost invariably reported as a species breeding as unassisted pairs, but a population of Carrion Crows (Corvus c. corone) from northern Spain that we have been studying since 1995 regularly exhibits cooperative breeding. The Spanish population thus demonstrates that cooperative breeding can vary greatly across populations. Most of the breeding territories (73.3%) in Spain were held by cohesive groups, which consisted of up to nine birds (mode = 3 birds). The proportion of fledglings that delayed dispersal for one year varied between 12.2 and 47.5% for different cohorts. The corresponding values for juveniles postponing dispersal for two years were 4.9 and 19.2%. Philopatry was skewed toward males. Some social groups contained immigrants. Therefore, delayed juvenile dispersal was not the only route towards sociality. Up to three helpers provided food to the nestling and at least one helper was found in all the groups surveyed. However, some group members refrained from visiting nests and thus the contribution to nestling care was highly variable among individuals.

scholarly journals Cooperative breeding and monogamy in mammalian societies

2012 ◽  
Vol 279 (1736) ◽  
pp. 2151-2156 ◽  
Author(s):  
Dieter Lukas ◽  
Tim Clutton-Brock
Keyword(s):  
Cooperative Breeding ◽  
Mammalian Species ◽  
Breeding Systems ◽  
Single Male ◽  
Extra Pair Paternity ◽  
Monogamous Species ◽  
Cooperatively Breeding ◽  
Socially Monogamous ◽  
Group Members ◽  
Reproductive Altruism

Comparative studies of social insects and birds show that the evolution of cooperative and eusocial breeding systems has been confined to species where females mate completely or almost exclusively with a single male, indicating that high levels of average kinship between group members are necessary for the evolution of reproductive altruism. In this paper, we show that in mammals, the evolution of cooperative breeding has been restricted to socially monogamous species which currently represent 5 per cent of all mammalian species. Since extra-pair paternity is relatively uncommon in socially monogamous and cooperatively breeding mammals, our analyses support the suggestion that high levels of average kinship between group members have played an important role in the evolution of cooperative breeding in non-human mammals, as well as in birds and insects.

scholarly journals Climate and the distribution of cooperative breeding in mammals

2017 ◽  
Vol 4 (1) ◽  
pp. 160897 ◽  
Author(s):  
Dieter Lukas ◽  
Tim Clutton-Brock
Keyword(s):  
Cooperative Breeding ◽  
Breeding Systems ◽  
Annual Rainfall ◽  
Alloparental Care ◽  
Arid Environments ◽  
Social Monogamy ◽  
Dominant Group ◽  
Group Members

Cooperative breeding systems, in which non-breeding individuals provide care for the offspring of dominant group members, occur in less than 1% of mammals and are associated with social monogamy and the production of multiple offspring per birth (polytocy). Here, we show that the distribution of alloparental care by non-breeding subordinates is associated with habitats where annual rainfall is low. A possible reason for this association is that the females of species found in arid environments are usually polytocous and this may have facilitated the evolution of alloparental care.

scholarly journals Artificial mass loading disrupts stable social order in pigeon dominance hierarchies

2020 ◽  
Vol 16 (8) ◽  
pp. 20200468
Author(s):  
Steven J. Portugal ◽  
James R. Usherwood ◽  
Craig R. White ◽  
Daniel W. E. Sankey ◽  
Alan M. Wilson
Keyword(s):  
Body Mass ◽  
Social Order ◽  
Dominance Hierarchy ◽  
Mass Loading ◽  
Direct Link ◽  
Dominance Hierarchies ◽  
Closed Population ◽  
Group Members ◽  
Linear Dominance Hierarchy ◽  
Over Time

Dominance hierarchies confer benefits to group members by decreasing the incidences of physical conflict, but may result in certain lower ranked individuals consistently missing out on access to resources. Here, we report a linear dominance hierarchy remaining stable over time in a closed population of birds. We show that this stability can be disrupted, however, by the artificial mass loading of birds that typically comprise the bottom 50% of the hierarchy. Mass loading causes these low-ranked birds to immediately become more aggressive and rise-up the dominance hierarchy; however, this effect was only evident in males and was absent in females. Removal of the artificial mass causes the hierarchy to return to its previous structure. This interruption of a stable hierarchy implies a strong direct link between body mass and social behaviour and suggests that an individual's personality can be altered by the artificial manipulation of body mass.

scholarly journals Linking silvicultural aspects of pro-poor leasehold forestry for socio-economic benefits to the poor and vulnerable communities

2018 ◽  
pp. 113-119
Author(s):  
K. K. Yadav ◽  
G. P. Kafley ◽  
K. P. Yadav
Keyword(s):  
Community Forestry ◽  
Economic Benefits ◽  
Environmental Conservation ◽  
The Poor ◽  
Silvicultural Practices ◽  
User Groups ◽  
Group Members ◽  
Forest User Groups ◽  
Over Time ◽  
Forest User

Government of Nepal has adopted different models like community forestry, leasehold forestry, collaborative forestry, buffer zone community forestry and public land agroforestry for management of forest resources. Poor focused leasehold forestry is only the approach adopted since early 1990 that has two major objectives: livelihood improvement and environmental conservation. Forest user groups of 5–15 households (HHs) are provided with part of national forests for a period of initial lease of 40 years. Leased forests are managed mainly with forestry crops, forage and non-timber forest products (NTFPs) to meet the dual objectives. Past studies and researches have indicated that leasehold forests are better than the hand over time however they are inadequate in dealing with silvicultural aspects in leasehold forestry (LF). This research paper has highlighted the significance of silvicultural aspects of leasehold forestry for overall socio-economic benefits to the poor and vulnerable forest users. Review of the existing policy and legal documents, studies and progress reports of the leasehold forestry projects implemented during the last two decades, consultation with leasehold forest user groups from five districts (Tehrathum, Makawanpur, Tanahun, Pyuthan and Doti) formed the main source of data for this article. Further, author’s own experiences in the sector were taken as supporting reliable information for the study. The study found that silvicultural practices, except plantations and weeding, were not adopted in leasehold forest but there was great potential for such practices to maximize the socio-economic benefits. Proper use of silvicultural practices might have increased contribution to currently realized benefits like (i) increased income of members i.e. poorest families (having less than 3 months secured foods) were reduced over years, (ii) group members had increased access to different networks and cooperatives, (iii) participation of women, poor and indigenous people increased in the decision-making process, and (iv) forest coverage was increased with respect to the hand over time. Some issues on silviculture aspects included proper guidelines for silvicultural methods, capacity of staff and leasehold forest user group members, smaller sizes of leasehold forests, and promotion of appropriate species. Banko JanakariA Journal of Forestry Information for Nepal Special Issue No. 4, 2018, Page: 113-119 

Experimental predator intrusions in a cooperative breeder reveal threat-dependent task partitioning

2020 ◽  
Vol 31 (6) ◽  
pp. 1369-1378 ◽  
Author(s):  
Dario Josi ◽  
Annika Freudiger ◽  
Michael Taborsky ◽  
Joachim G Frommen
Keyword(s):  
Behavioral Responses ◽  
Alloparental Care ◽  
Potential Threat ◽  
Antipredator Defense ◽  
Outside Options ◽  
Cooperatively Breeding ◽  
Indirect Fitness ◽  
Antipredator Behaviors ◽  
Group Members ◽  
Eusocial Animals

Abstract In cooperatively breeding species, nonbreeding individuals provide alloparental care and help in territory maintenance and defense. Antipredator behaviors of subordinates can enhance offspring survival, which may provide direct and indirect fitness benefits to all group members. Helping abilities and involved costs and benefits, risks, and outside options (e.g., breeding independently) usually diverge between group members, which calls for status-specific differentiated behavioral responses. Such role differentiation within groups may generate task-specific division of labor, as exemplified by eusocial animals. In vertebrates, little is known about such task differentiation among group members. We show how breeders and helpers of the cooperatively breeding cichlid Neolamprologus savoryi partition predator defense depending on intruder type and the presence of dependent young. In the field, we experimentally simulated intrusions by different fish species posing a risk either specifically to eggs, young, or adults. We used intrusions by harmless algae eaters as a control. Breeders defended most when dependent young were present, while helper investment hinged mainly on their body size and on the potential threat posed by the respective intruders. Breeders and helpers partitioned defense tasks primarily when dependent young were exposed to immediate risk, with breeders investing most in antipredator defense, while helpers increased guarding and care in the breeding chamber. Breeders’ defense likely benefits helpers as well, as it was especially enhanced in the treatment where helpers were also at risk. These findings illustrate that in a highly social fish different group members exhibit fine-tuned behavioral responses in dependence of ecological and reproductive parameter variation.

A Formal Theory of Reflected Appraisals in the Evolution of Power

2011 ◽  
Vol 56 (4) ◽  
pp. 501-529 ◽  
Author(s):  
Noah E. Friedkin
Keyword(s):  
Formal Theory ◽  
State Transitions ◽  
Relative Power ◽  
Social Psychological ◽  
Interpersonal Influences ◽  
Reflected Appraisals ◽  
Power And Control ◽  
Group Members ◽  
And Control ◽  
Over Time

This article investigates the evolution of power with a formal theory that focuses on the influence network through which control of a group’s outcomes emerges via direct and indirect interpersonal influences on group members’ positions on a series of issues over time. Power evolves when individuals’ openness or closure to interpersonal influences correspond with their prior relative control over the group’s issue outcomes. In groups with members who are appraising the relative power of their members over the outcomes of prior issues, a mechanism of “reflected appraisals” will elevate and dampen members’ self-appraisals of their relative power and the amount of influence they accord to others. Across a series of issues over time, this mechanism suffices to generate state transitions of a group’s influence network. The result is an evolution of the group’s influence network such that, with rare exceptions, power becomes concentrated and the preferences of a single leader control the group’s outcomes via intermediaries. A laboratory experiment and a simulation provide support for the theory. The analysis suggests that the evolution of the influence network toward concentrated forms of power and control is generated by fundamental social psychological responses to power and may occur in all enduring social groups whose members are dealing with a lengthy sequence of issues, independent of the conditions of bureaucratic organizations.

scholarly journals Fine-Scale Population Structure but Limited Genetic Differentiation in a Cooperatively Breeding Paper Wasp

2020 ◽  
Vol 12 (5) ◽  
pp. 701-714 ◽  
Author(s):  
Sarah E Bluher ◽  
Sara E Miller ◽  
Michael J Sheehan
Keyword(s):  
Population Structure ◽  
Genetic Differentiation ◽  
Cooperative Breeding ◽  
Isolation By Distance ◽  
Spatial Scales ◽  
Paper Wasp ◽  
Paper Wasps ◽  
Natal Philopatry ◽  
Continental Scale ◽  
Cooperatively Breeding

Abstract Relatively little is known about the processes shaping population structure in cooperatively breeding insect species, despite the long-hypothesized importance of population structure in shaping patterns of cooperative breeding. Polistes paper wasps are primitively eusocial insects, with a cooperative breeding system in which females often found nests in cooperative associations. Prior mark-recapture studies of Polistes have documented extreme female philopatry, although genetic studies frequently fail to detect the strong population structure expected for highly philopatric species. Together these findings have led to lack of consensus on the degree of dispersal and population structure in these species. This study assessed population structure of female Polistes fuscatus wasps at three scales: within a single site, throughout Central New York, and across the Northeastern United States. Patterns of spatial genetic clustering and isolation by distance were observed in nuclear and mitochondrial genomes at the continental scale. Remarkably, population structure was evident even at fine spatial scales within a single collection site. However, P. fuscatus had low levels of genetic differentiation across long distances. These results suggest that P. fuscatus wasps may employ multiple dispersal strategies, including extreme natal philopatry as well as longer-distance dispersal. We observed greater genetic differentiation in mitochondrial genes than in the nuclear genome, indicative of increased dispersal distances in males. Our findings support the hypothesis that limited female dispersal contributes toward population structure in paper wasps.

Sign in / Sign up

Export Citation Format

Share Document