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opencc-zeroMar 2024View details →

Evolution of conditional cooperation in collective-risk social dilemma with repeated group interactions

The question of how cooperation evolves and is sustained over time has been a long-standing and unresolved issue in the fields of evolutionary biology and social sciences. Previous theoretical and experimental research based on the collective-risk social dilemma game has revealed the risk that the failure of collective goals will affect the evolution of cooperation. Considering that in the real world individuals usually adjust their decisions based on environmental factors such as risk intensity and cooperation level, it is still not well understood how such conditional behaviors affect the evolution of cooperation in repeated group interactions scenario from a theoretical perspective. Here, we construct an evolutionary game model with repeated interactions, in which defectors decide whether to cooperate in subsequent rounds of the game based on whether the risk exceeds their tolerance threshold and whether the number of cooperators exceeds the collective goal in the early rounds of the game. We find that the introduction of conditional cooperation strategy can effectively promote the emergence of cooperation, especially when the risk is low. In addition, the risk threshold significantly affects the evolutionary outcomes. Furthermore, our results confirm that a high risk can promote the emergence of cooperation. Importantly, when the risk exceeds the tolerance threshold, timely adjustment of strategies by conditional cooperators is beneficial for maintaining high-level cooperation.

opencc-zeroApr 2024View details →

Causal evidence for social group sizes from Wikipedia editing data

Human communities have self-organizing properties in which specific Dunbar Numbers may be invoked to explain group attachments. By analyzing Wikipedia editing histories across a wide range of subject pages, we show that there is an emergent coherence in the size of transient groups formed to edit the content of subject texts, with two peaks averaging at around $N=8$ for the size corresponding to maximal contention, and at around $N=4$ as a regular team. These values are consistent with the observed sizes of conversational groups, as well as the hierarchical structuring of Dunbar graphs. We use the Promise Theory model of bipartite trust to derive a scaling law that fits the data and may apply to all group size distributions, when based on attraction to a seeded group process. In addition to providing further evidence that even spontaneous communities of strangers are self-organizing, the results have important implications for the governance of the Wikipedia commons and for the security of all online social platforms and associations.

opencc-zeroDec 2021View details →

Group composition of individual personalities alters social network structure in experimental populations of forked fungus beetles

Social network structure is a critical group character that mediates the flow of information, pathogens, and resources among individuals in a population, yet little is known about what shapes social structures. In this study, we experimentally tested whether social network structure depends on the personalities of group members. Replicate groups of forked fungus beetles (Bolitotherus cornutus) were engineered to include only members previously assessed as either more social or less social. We found that individuals behaved consistently across social contexts, exhibiting repeatable numbers of interactions and numbers of partners. At the group level, networks composed of more social individuals had higher interaction rates, higher tie density, higher global clustering, and shorter average shortest paths than those composed of less social individuals. We highlight group composition of personalities as a source of variance in group traits and a potential mechanism by which networks could evolve.

opencc-zeroFeb 2022View details →

Data from: Behavioral adjustments in the social associations of a precocial shorebird mediate the costs and benefits of grouping decisions

Animals weigh multiple costs and benefits when making grouping decisions. The cost-avoidance grouping framework proposes that group density, information quality, and risk affect an individual's preference for con- or heterospecific groups. However, this assumes the cost-benefit balance of a particular grouping is constant spatiotemporally, which may not always be true. Investigating how spatiotemporal context influences grouping choices is therefore key to understanding how animals contend with changing conditions. Changes in body size during development lead to variable conditions for individuals over short timescales that can influence their ecological interactions. Hudsonian godwits (Limosa haemastica), for instance, form a protective nesting association with a major predator of young godwit chicks, colonial short-billed gulls (Larus brachyrhynchus). Godwit broods may avoid areas of higher gull densities when chicks are susceptible to gull predation but likely experience higher risk from alternative predators as a result. Associating with conspecifics could allow godwits to buffer these costs but requires enough other broods with whom to group. To determine how age-dependent predation risk and conspecific density influence godwit grouping behaviors, we first quantified the time-dependent effects of con- and heterospecific interactions on the mortality risk for godwit chicks throughout development. We then determined how godwit density and chick age affected their associations with con- and heterospecifics. We found that younger godwit chicks' survival improved with closer association with conspecifics, earlier hatch dates, and lower gull densities, whereas older chicks survived better with earlier hatch dates, though this effect was less clear. Concomitantly, godwit broods avoided gulls early in development and when godwit densities were high but maintained loose associations with conspecifics throughout development. We identified how individuals can optimally shift with whom they group according to risks that vary spatially and temporally. Investigating the effects of a species' ecological interactions across spatiotemporal contexts in this way can shed light on how animals adjust their associations according to the costs and benefits of each association.

opencc-zeroMar 2022View details →

Group and individual social network metrics are robust to changes in resource distribution in experimental populations of forked fungus beetles

Social interactions drive many important ecological and evolutionary processes. It is therefore essential to understand the intrinsic and extrinsic factors that underlie social patterns. A central tenet of the field of behavioral ecology is the expectation that the distribution of resources shapes patterns of social interactions. We combined experimental manipulations with social network analyses to ask how patterns of resource distribution influence complex social interactions. We experimentally manipulated the distribution of an essential food and reproductive resource in semi-natural populations of forked fungus beetles (Bolitotherus cornutus). We aggregated resources into discrete clumps in half of the populations and evenly dispersed resources in the other half. We then observed social interactions between individually marked beetles. Half-way through the experiment, we reversed the resource distribution in each population, allowing us to control any demographic or behavioral differences between our experimental populations. At the end of the experiment, we compared individual and group social network characteristics between the two resource distribution treatments. We found a statistically significant but quantitatively small effect of resource distribution on individual social network position and detected no effect on group social network structure. Individual connectivity (individual strength) and individual cliquishness (local clustering coefficient) increased in environments with clumped resources, but this difference explained very little of the variance in individual social network position. Individual centrality (individual betweenness) and measures of overall social structure (network density, average shortest path length, and global clustering coefficient) did not differ between environments with dramatically different distributions of resources. Our results illustrate that the resource environment, despite being fundamental to our understanding of social systems, does not always play a central role in shaping social interactions. Instead, our results suggests that sex differences and temporally fluctuating environmental conditions may be more important in determining patterns of social interactions.

opencc-zeroJun 2024View details →

Data from: Status-dependent metabolic effects of social interactions in a group-living fish

Social interactions can sometimes be a source of stress, but social companions can also ameliorate and buffer against stress. Stress and metabolism are closely linked, but the degree to which social companions modulate metabolic responses during stressful situations—and whether such effects differ depending on social rank—is poorly understood. To investigate this question, we studied Neolamprologus pulcher, a group-living cichlid fish endemic to Lake Tanganyika, and measured the metabolic responses of dominant and subordinate individuals when they were either visible or concealed from one another. When individuals could see each other, subordinates had lower maximum metabolic rates and tended to take longer to recover following an exhaustive chase compared to dominants. In contrast, metabolic responses of dominants and subordinates did not differ when individuals could not see one another. These findings suggest that the presence of a dominant individual has negative metabolic consequences for subordinates, even in stable social groups with strong prosocial relationships.

opencc-by-4.0Apr 2018View details →

Review of Recent Trends in Measuring the Computing Systems Intelligence-igure 2. Intelligence of different living creature (accessed 01.11.2017). 2.1. A crow solving a complex task (https://www.disclose.tv/spooky-genius-crow-had-to-be-removed-from-scientific-experiment- 314886). 2.2. A group of dolphins with a social behaviour (http://www.sciencemag.org/news/2012/04/teamwork-builds-big-brains); 2.3. An orangutan that use a spear to fish (https://primatology.net/2008/04/29/orangutan-photographed-using-tool-as-spear-to-fish)

Some species of birds have been shown capable of using different tools. Many studies consider the crows as very intelligent. Smirnova, Lazareva, and Zorina (2000) suggested that crows have some kind of numerical ability. Figure 2.1 presents a crow that uses a tool, a small stone in order to catch a worm from a glass of water.The dolphins in many studies are considered intelligent at the individual level. An advanced ability of dolphins is the self-awareness. Marten and Psarakos (1995) presented an interesting study based on self-view television to distinguish between self-examination and social behavior in the Bottlenose dolphin. The most well-known abilities of dolphins are to teach, learn and cooperate. Dolphins have a complex communication and social behaviour. Figure 2.2 presents the image of a common group of dolphins. Some studies prove that primates are one of the most intelligent in the class of animals (Reader, Hager, & Laland, 2011). Orangutans are one of the most intelligent primates. The ability of orangutans to use different types of tools in order to perform tasks is well-known. Figure 2.3 presents an orangutan that uses a spear to catch fish. The orangutans can be considered intelligent at individual level.

Fig. 46. Partial truncated map for Central and South America with species distributions for the M in Taxonomic notes on social wasps of the groups of Mischocyttarus wagneri (Buysson 1908) and M. barbatus Richards 1945 (Hymenoptera, Vespidae, Polistinae)

Fig. 46. Partial truncated map for Central and South America with species distributions for the M. barbatus group, and with the pooled distribution of the group of M. wagneri (see next figure for detailed representation of distributions of species of this group).

Fig. 47 in Taxonomic notes on social wasps of the groups of Mischocyttarus wagneri (Buysson 1908) and M. barbatus Richards 1945 (Hymenoptera, Vespidae, Polistinae)

Fig. 47. Map detail of southeastern South America (with partial view of some Brazilian states) with species distributions for the M. wagneri group. MG: Minas Gerais, RJ: Rio de Janeiro, SP: São Paulo, PR: Paraná, SC: Santa Catarina, RS: Rio Grande do Sul.

Fig. 45 in Taxonomic notes on social wasps of the groups of Mischocyttarus wagneri (Buysson 1908) and M. barbatus Richards 1945 (Hymenoptera, Vespidae, Polistinae)

Fig. 45. Scattergram of ratio variables for two species of the group of M. barbatus. X axis – LSI LMS (length of first metasomal segment over length of mesoscutum); Y axis – W wSI (apical with over basal width of first metasomal segment); black filled circles are M. mixtus; all other symbols are M. barbatus: gray asterisk (Panama); open circle (northwestern Venezuela); red crosses (northwestern Colombia); pink filled squares (southwestern Colombia); gray filled diamond (western Colombia, Pacific slope); open square (midwestern Colombia).

Figs. 1–4 in Taxonomic notes on social wasps of the groups of Mischocyttarus wagneri (Buysson 1908) and M. barbatus Richards 1945 (Hymenoptera, Vespidae, Polistinae)

Figs. 1–4. Measurements. (1) Clypeus: height (HCLP) and width (WCLP), and free upper element of lateral margin (flm); (2) pronotal carina width (WCAR), and mesoscutum length (LMS) and width (WMS); (3) mesopleuron height (HMP); (4) front wing discal cell length (LDIS).

Figs. 5–18. 5–7 in Taxonomic notes on social wasps of the groups of Mischocyttarus wagneri (Buysson 1908) and M. barbatus Richards 1945 (Hymenoptera, Vespidae, Polistinae)

Figs. 5–18. 5–7: frontal–dorsal view of anterior face of pronotum showing secondary margin (arrow) in M. barbatus (5), M. mixtus (6), M. wagneri (7); 8–10: same structures and species in dorsal view; 11–12: mesial view of fore coxa showing raised basal margin (arrow) in M. mixtus (11), M wagneri (12); 13–14: inner (larger) hind tarsal claw (arrow) in M. mixtus (13, lateral) and M. barbatus (14, ventral); 15: hind tarsus of M. wagneri (a), M. mourei (b), M. proximus (c), M. camanducaia sp. nov. (d), M. declaratus (e); 16–18: nests of M. proximus (16), M. wagneri (17), M. barbatus (18); all scales = 0.50 mm, except in Fig. 18 (= 10 mm); groups of figs. (5–7), (8–10), (11–12), (13–14) share the same scale.

Fig. 14 in Notes on social wasps of the group of Mischocyttarus (Omega) punctatus (Ducke), with description of six new species (Hymenoptera, Vespidae, Polistinae)

Fig. 14. (A) Large colony (ca. 40 cm) of Mischocyttarus ryani sp. nov. (Lençóis, BA); (B and C) details of other two colonies of M. ryani sp. nov. showing individuals raising their bodies on mid and hind legs (same place); (D) mature inflorescence of a vine wherein colonies of M. ryani sp. n. were also found (same place); (E) small colony (nest A) with individual female of M. rodriguesi sp. nov., hanging from a Cuscuta trichostyla filiform stem in deep Amazonian rainforest (Caxiuanã, PA); (F) small colony with three females on a forked nest of M. vaqueroi, hanging from a suspense root, in Caxiuanã (PA).

Fig. 11 in Notes on social wasps of the group of Mischocyttarus (Omega) punctatus (Ducke), with description of six new species (Hymenoptera, Vespidae, Polistinae)

Fig. 11. (A–H) Partial halves of anterior mesosoma to show pronotal carina and mesoscutal sculpture (scale as in B): (A) Mischocyttarus rodriguesi sp. nov.; (B) M. caxiuana sp. nov.; (C) M. punctatus; (D) M. ryani sp. nov.; (E) M. tayrona sp. nov.; (F) M. anchicaya sp. nov.; (G) M. verissimoi sp. nov.; (H) M. vaqueroi. (I–L) Detail of mesoscutal sculpture (scale bar = 0.1 mm): (I) M. anchicaya sp. nov.; (J) M. ryani sp. nov.; (K) M. rodriguesi sp. nov.; (L) M. caxiuana sp. nov. (M–N) Posterior view of head showing pre-foraminal region and occipital carina (scale as in N): (M) M. vaqueroi; (N) M. caxiuana sp. nov.

Fig. 12 in Notes on social wasps of the group of Mischocyttarus (Omega) punctatus (Ducke), with description of six new species (Hymenoptera, Vespidae, Polistinae)

Fig. 12. General lateral views of holotype females of: (A) Mischocyttarus tayrona sp. nov.; (B) M. anchicaya sp. nov.; (C) M. caxiuana sp. nov.; (D) M. verissimoi sp. nov.; (E) M. rodriguesi sp. nov.; (F) M. ryani sp. nov.

Fig. 13 in Notes on social wasps of the group of Mischocyttarus (Omega) punctatus (Ducke), with description of six new species (Hymenoptera, Vespidae, Polistinae)

Fig. 13. (A) Nest of M. rodriguesi sp. nov. (nest A; Caxiuanã, PA) showing attachment to stem of Cuscuta trichostyla; (A1) detail of attachment of basal cell of nest A to the substrate plant; (B) nest fragment of M. rodriguesi sp. nov. (nest B; Caxiuanã, PA); (C) large fragment of abandoned nest of the M. punctatus group (Juruti, PA) showing several incomplete cells and long "interconnecting stalks".

opencc-by-4.0Dec 2008View details →

Figure 2 in Molecular systematics of social skinks: phylogeny and taxonomy of the Egernia group (Reptilia: Scincidae)

Figure 2. Strict consensus tree of the MP and Bayesian trees, showing suggested generic break up of Egernia.