scholarly journals Gibbon strategies in a food competition task

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alejandro Sánchez-Amaro ◽  
Robert Ball ◽  
Federico Rossano

AbstractSocial primates face conflicts of interest with other partners when their individual and collective interests collide. Despite living in small, primarily bonded, groups compared to other social primates, gibbons are not exempt from these conflicts in their everyday lives. In the current task, we asked whether dyads of gibbons would solve a conflict of interest over food rewards. We presented dyads of gibbons with a situation in which they could decide whether to take an active role and pull a handle to release food rewards at a distance or take a passive role and avoid action. In this situation, the passive partner could take an advantageous position to obtain the rewards over the active partner. Gibbons participated in three conditions: a control condition with no food rewards, a test condition with indirect food rewards and a test condition with direct food rewards. In both test conditions, five rewards were released at a distance from the handle. In addition, the active individual could obtain one extra food reward from the handle in the direct food condition. We found that gibbons acted more often in the two conditions involving food rewards, and waited longer in the indirect compared to the direct food condition, thus suggesting that they understood the task contingencies. Surprisingly, we found that in a majority of dyads, individuals in the active role obtained most of the payoff compared to individuals in the passive role in both food conditions. Furthermore, in some occasions individuals in the active role did not approach the location where the food was released. These results suggest that while gibbons may strategize to maximize benefits in a competitive food task, they often allowed their partners to obtain better rewards. Our results highlight the importance of social tolerance and motivation as drivers promoting cooperation in these species.

2020 ◽  
Author(s):  
Alejandro Sanchez-Amaro ◽  
Robert Ball ◽  
Federico Rossano

Abstract Social primates face conflicts of interest with other partners when their individual and collective interests collide. Despite living in small, primarily dyadic, groups compared to other social primates, gibbons are not exempt from these conflicts in their everyday lives. In the current task, we asked whether pairs of gibbons would solve a conflict of interest over food rewards. We presented pairs of gibbons with a situation in which one pair member, the actor, could release food rewards at a distance, giving the passive partner a chance to take an advantageous position to obtain the rewards. Gibbons participated in three conditions: A No Food control, an Altruistic situation in which the actor could not obtain a direct reward from the cooperative act and a Test condition in which the actor could secure a small fraction of the total rewards. We found that gibbons acted more often in the two conditions involving food rewards, and waited longer when no direct rewards were available for the actor, thus suggesting that they understood the mechanism and that they faced a social trade-off between making the rewards available and waiting for each other to act. However, we found that in a majority of pairs, acting individuals benefitted more than the passive partners in both altruistic and test conditions. Furthermore, in some occasions actors actively refused to approach the location where the food was released. These results suggest that while gibbons strategize to solve the social dilemmas, they often allowed their partners to obtain better rewards. Our results highlight the importance of social tolerance and motivation as drivers promoting cooperation in these pair-living species.


2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mark Hopkins ◽  
Catherine Gibbons ◽  
Phillipa Caudwell ◽  
Dominic-Luc Webb ◽  
Per M. Hellström ◽  
...  

Changes in food reward have been implicated in exercise-induced compensatory eating behaviour. However, the underlying mechanisms of food reward, and the physiological correlates of exercise-induced changes in food reward, are unknown.Methods.Forty-six overweight and obese individuals completed 12 weeks of aerobic exercise. Body composition, food intake, and fasting metabolic-related hormones were measured at baseline, week six, and postintervention. On separate days, the reward value of high-and-low-fat food (explicit liking and implicit wanting) was also assessed at baseline, week six, and postintervention.Results.Following the intervention, FM, FFM, andVO2peakimproved significantly, while fasting leptin decreased. However, food intake or reward did not change significantly. Cross-sectional analyses indicated that FM (P=0.022) and FFM (P=0.046) were associated with explicit liking for high-fat food, but implicit wanting was associated with FM only (P=0.005). Fasting leptin was associated with liking (P=0.023) and wanting (P=0.021) for high-fat food. Furthermore, a greater exercise-induced decline in fasting leptin was associated with increased liking (P=0.018).Conclusion.These data indicate that food reward has a number of physiological correlates. In particular, fasting leptin appears to play an active role in mediating food reward during exercise-induced weight loss.


2020 ◽  
pp. 92-115
Author(s):  
Raimundas Kalesnykas

The article analyses the preconditions for the establishment of an anti-corruption environment in the public sector organization and demonstrates Lithuania's best practices in this area. Corruption as a multi - structured global phenomenon undermines good governance, public trust in public sector organizations and causes serious damage to the functioning of those organizations. One of the essential aspiration of the Lithuanian Government is to reduce the extent of corruption, increase transparency, fairness and openness in the public sector. Research focus on justification the hypothesis, that the public sector organizations must play an active role in the field of combating corruption, creating an unfavourable environment for corruption prevail. The purpose of the research is to show the added value for the development of anti-corruption environment in the public sector as one of the effective tool minimizing the extent of corruption. Research results shows that legislation alone is not sufficient to solve corruption problem. Public sector organizations usually do not have effective anti-corruption tools to prevent and manage various forms of corruption (bribery, nepotism, conflicts of interest, etc.). By conveying best practice, the author presented a new initiative of Lithuanian public sector organizations to develop anti-corruption environment aimed at minimizing the likelihood of manifestation of corruption. Logical and comparative analysis, document analysis, problem analysis and systematic approach research methods are used analyzing issues related with the boosting effectiveness of combating corruption in the public sector. The author's position and concludes, that the development of an anti-corruption environment should become a strategic priority of the public sector organization, which requires the establishment of an effective management system of corruption prevention and the commitment shown by top management to ensure its functioning in a realistic rather than formal way.


Author(s):  
Anita Indira Anand

This chapter discusses the existing conception of the public corporation and questions whether any of these ideas appropriately account for the rise of shareholder-driven corporate governance (SCG). In particular, it considers the contractarian model of the corporation as well as the agency theory, which explains the division of ownership and control as an agency relationship that necessarily produces agency costs. The chapter also addresses a newer and contrasting idea called principal cost theory, which argues that principal (or shareholder) control also comes at a cost, resulting from shareholders’ lack of expertise and the potential for conflicts of interest among them. This theory offers an important counterpoint to the normative arguments for SCG because it emphasizes the potential failings of shareholders and challenges the supposition that they are necessarily well positioned to play an active role in governance.


1998 ◽  
Vol 76 (5) ◽  
pp. 936-941 ◽  
Author(s):  
Santiago Merino ◽  
Jaime Potti

The nutritional status of the host may play a major role in mediating the detrimental effects of parasites. We performed an experiment with the aim of determining whether increased food availability can compensate for the effects of ectoparasites on growth during the late nestling period, final size, and survival until fledging of Pied Flycatcher (Ficedula hypoleuca) nestlings. Nests were provided with supplementary food, treated with insecticide, given both treatments, or given neither treatment (control). Differences in the number of blood-sucking, ectoparasitic blow fly larvae (Protocalliphora azurea) occurred between treated nests. Nestlings in the group given supplementary food and with low numbers of parasites grew faster and had a higher haematocrit value than those in groups that were fumigated and given supplementary food, with nestlings from control nests attaining the lowest values. Nestling measurements did not differ between fumigated and food-supplemented groups. Although the final sizes attained did not differ among nestlings from the different experimental groups, there was a significant difference in the rates of increase in size among groups. Nestlings in nests fumigated and provided with extra food were (nonsignificantly) smaller and leaner than nestlings from the other groups at the beginning of the experiment, but were slightly larger and heavier (again nonsignificantly) at the end of the experiment. Thus, their growth was faster than that of the other groups. The results are discussed, highlighting problems related to the function linking intensity of parasit ism to host fitness and variation in external (climate, food) conditions.


2005 ◽  
Vol 2 (4) ◽  
pp. 11-31 ◽  
Author(s):  
Marcello Bianchi ◽  
Luca Enriques

his paper tries to answer two questions: first, whether the changes in the law resulting from the 1998 reform are able to positively affect the attitude to activism of institutional investors in Italy; and second, whether, legal rules aside, it is reasonable to expect significant institutional investor activism in Italy. We provide both an empirical analysis of the factors affecting institutional investor activism in Italy and a legal analysis of the most relevant changes in the Italian mutual funds and corporate laws, following the 1998 reform. The empirical analysis shows that institutional shareholdings and investment strategies are compatible with the hypothesis that institutional investors can play a significant role in the corporate governance of Italian listed companies. However, a curb to their playing such an active role may derive from the predominance of mutual fund management companies belonging to banking groups (giving rise to conflicts of interest) and from the prevailing ownership structure of listed companies, which are still dominated by controlling shareholders holding stakes higher than, or close to, the majority of the capital (implying a weaker bargaining power of institutions vis-à-vis controllers). The analysis of the legal changes prompted by the 1998 financial markets and corporate law reform indicates that the legal environment is now definitely more favorable to institutional investor activism than before. However, the Italian legal environment proves still to be little favorable to institutional investor activism, when compared to that of the U.S. or the U.K.


2014 ◽  
Vol 5 (1) ◽  
pp. 71-86 ◽  
Author(s):  
Nuno D. Pires

AbstractSeeds are multi-generational structures containing a small embryonic plant enclosed in layers of diverse parental origins. The evolution of seeds was a pinnacle in an evolutionary trend towards a progressive retention of embryos and gametes within parental tissue. This strategy, which dates back to the first land plants, allowed an increased protection and nourishing of the developing embryo. Flowering plants took parental control one step further with the evolution of a biparental endosperm that derives from a second parallel fertilization event. The endosperm directly nourishes the developing embryo and allows not only the maternal genes, but also paternal genes, to play an active role during seed development. The appearance of an endosperm set the conditions for the manifestation of conflicts of interest between maternal and paternal genomes over the allocation of resources to the developing embryos. As a consequence, a dynamic balance was established between maternal and paternal gene dosage in the endosperm, and maintaining a correct balance became essential to ensure a correct seed development. This balance was achieved in part by changes in the genetic constitution of the endosperm and through epigenetic mechanisms that allow a differential expression of alleles depending on their parental origin. This review discusses the evolutionary steps that resulted in the appearance of seeds and endosperm, and the epigenetic and genetic mechanisms that allow a harmonious coinhabitance of multiple generations within a single seed.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Federica Amici ◽  
Anja Widdig ◽  
Andrew J. J. MacIntosh ◽  
Victor Beltrán Francés ◽  
Alba Castellano-Navarro ◽  
...  

AbstractPrimates live in complex social systems with social structures ranging from more to less despotic. In less despotic species, dominance might impose fewer constraints on social choices, tolerance is greater than in despotic species and subordinates may have little need to include novel food items in the diet (i.e. neophilia), as contest food competition is lower and resources more equally distributed across group members. Here, we used macaques as a model to assess whether different dominance styles predict differences in neophilia and social tolerance over food. We provided familiar and novel food to 4 groups of wild macaques (N = 131) with different dominance styles (Macaca fuscata, M. fascicularis, M. sylvanus, M. maura). Our study revealed inter- and intra-specific differences in individuals’ access to food, which only partially reflected the dominance styles of the study subjects. Contrary to our prediction, social tolerance over food was higher in more despotic species than in less despotic species. Individuals with a higher dominance rank and being better socially integrated (i.e. higher Eigenvector centrality) were more likely to retrieve food in all species, regardless of their dominance style. Partially in line with our predictions, less integrated individuals more likely overcame neophobia (as compared to more integrated ones), but only in species with more tolerance over food. Our study suggests that individual characteristics (e.g. social integration or personality) other than dominance rank may have a stronger effect on an individual’s access to resources.


1930 ◽  
Vol 21 (2) ◽  
pp. 141-145 ◽  
Author(s):  
R. E. Moreau

During the early part of 1929, a specially severe infestation of locusts occurred in the northern provinces of Tanganyika Territory, an extension of the plague already felt in Kenya. Laying was known to have taken place more or less continuously over the drier country all the way from Longido, west of Kilimanjaro, to the West Usambara Mountains. Successive broods of young locusts had to be dealt with; and in the same area it was possible to see newly hatched hoppers and insects almost full-grown and able to fly. An ample supply of extra food was therefore provided for any birds that might care to avail themselves of it, except the smallest, and certain specialists such as the Hirundines. I was anxious to get some idea of how the birds would react to these abnormal food-conditions, and by the kindness of Dr. and Mrs. R. R. Le G. Worsley, the former of whom was in charge of a sector of the locust campaign, I was able during the first week of June 1929 to make observations in a very heavily infested area between the Middle Pangani River and the South Pare Mountains. I have also to thank the Director E.A.A.R.S. for certain facilities in this connection.


Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 2134-2134
Author(s):  
Kendall H Sullivan ◽  
Michael Toscani ◽  
Tayla Poretta ◽  
Ciera Patzke ◽  
Thushara Korattyil ◽  
...  

Introduction: As the complexity of the LYM treatment landscape increases, patients (pts) have become more involved in understanding treatment options, joining advocacy organizations, and seeking information through a multitude of venues. This has increased the pts voice in the treatment decision-making (DM) process while considering several factors (i.e. route of administration, side effects, cost, access to care, quality of life, etc). There is robust evidence that establishes the importance of a collaborative relationship between pts and clinicians when making treatment related decisions. The growing evidence also suggests there is an increased need for pt oriented-research, including communication between the scientific community and cancer pts. However, despite the established need for shared DM, there are discrepancies between the extent that pts prefer to be involved vs their actual involvement. Previous studies have suggested that elderly pts and pts with lower education status prefer a passive DM role. Our objective was to facilitate a detailed survey identifying clinical characteristics and demographics that influence the preferred and actual role that LYM pts have in shared treatment DM. Methods: This study was reviewed and approved by the Rutgers IRB. A 30 question survey was developed and sent to the LYM Research Foundation (LRF) distribution list of pts and caregivers. This voluntary and anonymous survey was available through the online survey platform Qualtrics®, a Rutgers University approved survey platform, and was sent to 132,827 unique email addresses. Data collection and analysis was performed solely through the Qualtrics online platform with no additional pt identifiers or information collected. Statistical analyses were performed using non-parametric two-sided Mann Whitney U test and Fisher exact testing. Results: Of the 132,827 unique email addresses that received the survey, an estimated 12,316 recipients opened the email with a total of 1045 participants completing the survey. Among the 1045 participants, 878 were LYM pts or survivors. Of the 878 pts, 58% were current and the remaining were survivors. Among known diagnoses, the most common subtypes were follicular LYM (30%), CLL/SLL (25%), mantle cell LYM (20%), Waldenstroms macroglobulinemia (10%), & diffuse large B cell LYM (8%). At the time of diagnosis, the majority of pts (73.7%) were 60 years or older. There were slightly more female (55%) than male pts. Disease status for pts: 22% had not yet received therapy, 38% reported 1 line of therapy, and 40% 2 or more. Additionally, 49% reported receiving chemotherapy, 55% receiving immunotherapy. Considering the 878 LYM pts who were included in this analysis, 460 (52%) responded to their preferred role in treatment DM. Furthermore, 448/460 (97%) pts responded that they preferred to have an active role in the treatment DM paradigm. However, 147/448 (33%) responded they did not have a role in the DM process. We analyzed several pt demographic and disease variables for the impact on decision making (Table).There was no significant difference in the probability of pts with no role in DM for most subgroups. There was a trend for LYM pts with relapsed/refractory disease in having less of a role in DM for therapy compared with newly diagnosed pts, while there was no apparent differences based on whether immunotherapy was part of therapy or not. However, there was a prominent difference in the probability of pts when stratified by age with 27% of pts ages ≥60 years vs 50% of LYM pts ages <60 years stating that they did not have a role in DM for their treatment (Table). Conclusions: This analysis informs the perspective of LYM pts and survivors regarding their roles in treatment DM. While nearly all responding pts reported they preferred to have an active role in the treatment DM process, 1/3 of those pts stated that they did not have a role. This preference transcended most pt demographics and disease characteristics. However, there was a prominent age-based discrepancy with younger LYM pts reporting no role in treatment decisions compared with older pts. Based off of previous evidence that suggests older pts prefer a more passive role, this data suggests pts perception of their actual role in shared treatment DM can be influenced by their reported preference. Continued analyses and studies are warranted to understand the ongoing gaps and to improve the overall DM process for pts and providers. Disclosures No relevant conflicts of interest to declare.


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