The manifestations and interdependence of social and physiological aging in wild female Assamese macaques (Macaca assamensis) DOI Creative Commons
Baptiste Sadoughi

Published: Jan. 1, 2023

Aging is a multifaceted process which increases the probability of death, and although there can be only one outcome, ways to get are diverse. Accumulating evidence aging in natural animal populations has shed light on this diversity, both across within species, but we still have little knowledge opportunities, constraints trade-offs faced by individuals as they go through ultimate life-history stage. Specifically, it remains unclear individual traits exhibit signs aging, how may adjust their behavior response physiological decay, how, together, these changes ultimately contribute whole-organism aging. As such, investigating age-related social functions imperative reach more holistic understanding A key issue addressing strong association between sociality health. Social bonds, integration, exposure adversity important predictors health lifespan mammals. some mechanisms underlying connections uncovered, becomes especially clear that component influence other. Yet, interdependences physiology seldom been addressed study due partly lack detailed data long-lived species. Another difficulty arises from need assess via markers measured non-invasively collected samples. Finally, an individual-level process, demographic cohort effects patterns uncovered cross-sectional studies, calls for longitudinal approach. In thesis, I investigate wild female Assamese macaques (Macaca assamensis) address questions at crossroad sociality, populations: Does changes? Which systems, interface with should investigated manifestations traits, vice versa? Can biomarkers energetic state provide means under field conditions? To issues macaques, use extensive behavioral data, review linking non-human primates, after focus HPA axis gut microbiome systems. validated non-invasive measurement metabolic activity offer perspective explore causal path towards sociality. My results show experience Females decreased engagement reduced size grooming network advancing age. This phenomenon could not explained opportunities interact was associated greater tendency preferred partners addition within-individual age effects, dynamics were influenced processes consistent selective disappearance poorly socially connected individuals. Together, highlight contribution group-level do support increasing selectivity primary driver disengagement population. For find trait-specific patterns, traits. assessed fecal glucocorticoid concentrations age, neither before nor accounting strength individuals’ bonds. The taxonomic diversity bacterial community predictor composition However, exhibited personal signature became less stable increasingly personalized decrease transmission bacteria contributed to, sufficient explain, here. validation conducted food restriction experiment captive urinary triiodothyronine cortisol. Both hormones predicted change increase cortisol during phase experiment. Furthermore, variation correlated positively body mass. Concentrations reasonably robust many collection samples conditions, making suitable marker macaques. conclusion, progressive modifications several aspects communities, whereas appear constant over adulthood. characterization population necessary step constraints, potential face. my thesis contributes growing biogerontology. Future research differ average trajectories consider age-specific optima, advance our links health,

Language: Английский

Social ageing: exploring the drivers of late-life changes in social behaviour in mammals DOI Creative Commons
Erin R. Siracusa, James P. Higham, Noah Snyder‐Mackler

et al.

Biology Letters, Journal Year: 2022, Volume and Issue: 18(3)

Published: March 1, 2022

Social interactions help group-living organisms cope with socio-environmental challenges and are central to survival reproductive success. Recent research has shown that social behaviour relationships can change across the lifespan, a phenomenon referred as ‘social ageing’. Given importance of integration for health well-being, age-dependent changes in modulate how fitness age may be an important source unexplained variation individual patterns senescence. However, integrating into ageing requires deeper understanding causes consequences age-based behaviour. Here, we provide overview drivers late-life sociality. We suggest explanations categorized three groups: sociality (a) occur result senescence; (b) from adaptations ameliorate negative effects and/or (c) positive demographic changes. Quantifying relative contribution these processes will allow us move towards more holistic why emerge insights potential delay or accelerate other

Language: Английский

Citations

56
Ageing red deer alter their spatial behaviour and become less social DOI
Gregory F. Albery, Tim Clutton‐Brock,

Alison Morris

et al.

Nature Ecology & Evolution, Journal Year: 2022, Volume and Issue: 6(8), P. 1231 - 1238

Published: July 21, 2022

Language: Английский

Citations

53
Within-individual changes reveal increasing social selectivity with age in rhesus macaques DOI Creative Commons
Erin R. Siracusa, Josué E. Negrón-Del Valle, Daniel Phillips

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2022, Volume and Issue: 119(49)

Published: Nov. 29, 2022

Accumulating evidence in humans and other mammals suggests older individuals tend to have smaller social networks. Uncovering the cause of these declines can inform how changes relationships with age affect health fitness later life. While age-based networks been thought be detrimental, physical physiological limitations associated may lead adjust their behavior more selective partner choice. Greater selectivity has shown humans, but extent which this phenomenon occurs across animal kingdom remains an open question. Using longitudinal data from a population rhesus macaques on Cayo Santiago, we provide compelling nonhuman for within-individual increases age. Our analyses revealed that adult female actively reduced size as they aged focused partners previously linked benefits, including kin whom were strongly consistently connected earlier Females spent similar amounts time socializing aged, suggesting network shrinkage does not result lack motivation or ability engage, nor was narrowing driven by deaths partners. Furthermore, females remained attractive companions isolated withdrawal Taken together, our results rare empirical nonhumans, patterns increasing deeply rooted primate evolution.

Language: Английский

Citations

41
Ageing and sociality: why, when and how does sociality change ageing patterns? DOI
Judith Korb, Jürgen Heınze

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2021, Volume and Issue: 376(1823), P. 20190727 - 20190727

Published: March 8, 2021

Individual lifespans vary tremendously between and also within species, but the proximate ultimate causes of different ageing speeds are still not well understood. Sociality appears to be associated with evolution greater longevity probably a larger plasticity shape pace ageing. For example, reproductives several termites ants reach that surpass those their non-reproductive nestmates by one or two decades. In this issue, 15 papers explore interrelations sociality individual in both, group-living vertebrates social insects. Here, we briefly give an overview contents various contributions, including theoretical comparative studies, similarities dissimilarities mechanisms underlying among taxa, particular emphasis on nutrient-sensing pathways and, insects, juvenile hormone. These studies point underestimated role more downstream processes. We highlight need for reliable transcriptomic markers comprehensive theory animals, which includes reproductive potential workers, considers fact insect queens maturity only after prolonged period producing workers. This article is part theme issue 'Ageing sociality: why, when how does change patterns?'

Language: Английский

Citations

43
Social ageing can protect against infectious disease in a group-living primate DOI Creative Commons
Erin R. Siracusa, Melissa A. Pavez-Fox, Josué E. Negrón-Del Valle

et al.

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 379(1916)

Published: Oct. 28, 2024

The benefits of social living are well established, but sociality also comes with costs, including infectious disease risk. This cost-benefit ratio is expected to change across individuals' lifespans, which may drive changes in behaviour age. To explore this idea, we combine data from a group-living primate for ageing has been described epidemiological models show that having lower connectedness when older can protect against the costs hypothetical, directly transmitted endemic pathogen. Assuming no age differences characteristics (susceptibility to, severity and duration infection), individuals suffered infection was explained largely because they were less connected their networks than younger individuals. benefit 'social ageing' depended on greatest increased When age, beneficial only pathogen transmissibility low. Older benefited most frequency interactions (strength) network embeddedness (closeness) fewer partners (degree). Our study provides first examination epidemiology ageing, demonstrating potential pathogens influence evolutionary dynamics natural populations.This article part discussion meeting issue 'Understanding society using populations'.

Language: Английский

Citations

7
The ecology of ageing in wild societies: linking age structure and social behaviour DOI Creative Commons
Joe P. Woodman, Samin Gokcekus, Kristina B. Beck

et al.

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 379(1916)

Published: Oct. 28, 2024

The age of individuals has consequences not only for their fitness and behaviour but also the functioning groups they form. Because social often changes with age, population structure is expected to shape organization, environments experience operation processes within populations. Although research explored in individual particularly controlled settings, there limited understanding how governs sociality wild Here, we synthesize previous into age-related effects on natural populations, discuss links between structure, ecology, specifically focusing might influence functioning. We highlight potential using empirical data from populations combination network approaches uncover pathways linking ageing, societal broader implications these insights impacts anthropogenic animal demography building a deeper ageing general. This article part discussion meeting issue ‘Understanding society populations’.

Language: Английский

Citations

7
Ageing in a collective: the impact of ageing individuals on social network structure DOI Creative Commons
Erin R. Siracusa, André S. Pereira, Josefine Bohr Brask

et al.

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2023, Volume and Issue: 378(1874)

Published: Feb. 20, 2023

Ageing affects many phenotypic traits, but its consequences for social behaviour have only recently become apparent. Social networks emerge from associations between individuals. The changes in sociality that occur as individuals get older are thus likely to impact network structure, yet this remains unstudied. Here we use empirical data free-ranging rhesus macaques and an agent-based model test how age-based feed up influence: (i) individual's level of indirect connectedness their (ii) overall patterns structure. Our analyses revealed female became less indirectly connected they aged some, not all measures examined. This suggests connectivity is affected by ageing, ageing animals can remain well integrated some contexts. Surprisingly, did find evidence a relationship age distribution the structure macaque networks. We used gain further understanding link differences global under which circumstances effects may be detectable. Overall, our results suggest potentially important underappreciated role function animal collectives, warrants investigation. article part discussion meeting issue ‘Collective through time’.

Language: Английский

Citations

14
Social network shrinking is explained by active and passive effects but not increasing selectivity with age in wild macaques DOI Creative Commons
Baptiste Sadoughi, Roger Mundry, Oliver Schülke

et al.

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 291(2018)

Published: March 13, 2024

Evidence of social disengagement, network narrowing and selectivity with advancing age in several non-human animals challenges our understanding the causes ageing. Natural animal populations are needed to test whether ageing occur under natural predation extrinsic mortality pressures, longitudinal studies particularly valuable disentangle contribution within-individual from demographic processes that shape at population level. Data on wild Assamese macaques ( Macaca assamensis ) were collected between 2013 2020 Phu Khieo Wildlife Sanctuary, Thailand. We investigated behaviour 61 adult females observed for 13 270 h mechanistic hypotheses evaluated consistency patterns mixed-longitudinal analyses. With age, reduced size their network, which could not be explained by an overall increase time spent alone, but age-related decline mostly active, also passive, behaviour, best demonstrated A selective tendency approach preferred partners was maintained into old did increase. Our results contribute driver suggest disengagement follow independent trajectories during

Language: Английский

Citations

6
Age-dependent shaping of the social environment in a long-lived seabird: a quantitative genetic approach DOI Creative Commons
María Moirón, Sandra Bouwhuis

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 379(1916)

Published: Oct. 28, 2024

Individual differences in social behaviour can result fine-scale variation spatial distribution and, hence, the environment experienced. Given expected fitness consequences associated with environments, it is imperative to understand factors that shape them. One potential such factor age. Age-specific behaviour—often referred as ‘social ageing’—has only recently attracted attention, requiring more empirical work across taxa. Here, we use 29 years of longitudinal data collected a pedigreed population long-lived, colonially breeding common terns ( Sterna hirundo ) investigate sources in, and quantitative genetic underpinnings of, an aspect ageing: shaping experienced, using number neighbours during proxy. Our analyses reveal age-specific declines breeding, well selective disappearance individuals high neighbours. Moreover, find this trait, individual slope its decline, be heritable. These results suggest ageing might underpin part overall multicausal phenotype, undergo microevolution, highlighting role facilitator for, or constraint evolutionary natural populations. This article discussion meeting issue ‘Understanding age society populations’.

Language: Английский

Citations

6
Social ageing can protect against infectious disease in a group-living primate DOI Creative Commons
Erin R. Siracusa, Melissa A. Pavez-Fox, Josué E. Negrón-Del Valle

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: March 13, 2024

Abstract The benefits of social living are well established, but sociality also comes with costs, including infectious disease risk. This cost-benefit ratio is expected to change across individuals’ lifespans, which may drive changes in behaviour age. To explore this idea, we combine data from a group-living primate for ageing has been described epidemiological models show that having lower connectedness when older can protect against the costs hypothetical, directly transmitted endemic pathogen. Assuming no age differences characteristics (susceptibility to, severity, and duration infection), individuals suffered infection was explained largely because they were less connected their networks than younger individuals. benefit ‘social ageing’ depended on greatest severity increased When age, beneficial only pathogen transmissibility low. Older benefited most frequency interactions (strength) network embeddedness (closeness) fewer partners (degree). Our study provides first examination epidemiology ageing, demonstrating potential pathogens influence evolutionary dynamics natural populations.

Language: Английский

Citations

5