Fast Life History Research Articles

Different adverse childhood experiences and adolescents' altruism: The mediating role of life history strategy.

The present study sought to investigate whether the relationship between childhood trauma, childhood socioeconomic (SES), and adolescents' altruism were mediated by their life history strategies and different adverse childhood experiences may function diversely on altruism, with two waves of data collected 6 months apart in a longitudinal design among Chinese adolescents. A total of 658 adolescents (Mage = 13.51, SD = 0.73 at T1) were recruited and completed the online survey; their life history strategies were measured by the Mini-K, the Delayed of Gratification Questionnaire (DOG), and the Chinese version of the Adolescent Risk-Taking Questionnaire (ARQ-RB) together, and their altruism was collected again after six months. After controlling for gender and their altruism at T1, the results showed that childhood trauma (i.e., emotional maltreatment, physical maltreatment), as well as low SES and fast life history strategy, were significantly negatively correlated with adolescents' altruism at T2. Importantly, life history strategy at T1 mediated the relationship between T1 emotional maltreatment, T1 low SES, and adolescents' altruism at T2. However, the effect of physical maltreatment on altruism was not mediated by life history strategy. This study indicated that emotional maltreatment and low SES can affect adolescents' altruism by influencing the formation of adolescents' life history strategies. The findings revealed the different influences of adverse childhood experiences on adolescents' altruism, which supplied new empirical evidence for the life history theory and provided certain reference values for cultivating adolescents' altruism.

Body size and life history shape the historical biogeography of tetrapods.

Dispersal across biogeographic barriers is a key process determining global patterns of biodiversity as it allows lineages to colonize and diversify in new realms. Here we demonstrate that past biogeographic dispersal events often depended on species' traits, by analysing 7,009 tetrapod species in 56 clades. Biogeographic models incorporating body size or life history accrued more statistical support than trait-independent models in 91% of clades. In these clades, dispersal rates increased by 28-32% for lineages with traits favouring successful biogeographic dispersal. Differences between clades in the effect magnitude of life history on dispersal rates are linked to the strength and type of biogeographic barriers and intra-clade trait variability. In many cases, large body sizes and fast life histories facilitate dispersal success. However, species with small bodies and/or slow life histories, or those with average traits, have an advantage in a minority of clades. Body size-dispersal relationships were related to a clade's average body size and life history strategy. These results provide important new insight into how traits have shaped the historical biogeography of tetrapod lineages and may impact present-day and future biogeographic dispersal.

Vital rates of a burgeoning population of Humpback Chub in western Grand Canyon

AbstractObjectiveThe Colorado River ecosystem has experienced habitat alterations and nonnative species invasions; as a result, many of its native species have had extirpations, abundance declines, and range constrictions. Despite these pitfalls, the Humpback Chub Gila cypha has persisted and in the last 10–15 years has expanded its range to become abundant in western Grand Canyon, a river segment in which it had been rare for the prior three decades. The goal of this study was to evaluate the population dynamics (i.e., growth, survival, movement, abundance) for this “new” group of Humpback Chub.MethodsWe analyzed a 6‐year mark–recapture study from a fixed monitoring reach in western Grand Canyon, and we provide the first estimates of survival and growth (vital rates) for these fish. We compared vital rates in western Grand Canyon to those of two life history forms (residents and migrants, representing fast and slow life history trajectories, respectively) from the more established Little Colorado River (LCR) aggregation in eastern Grand Canyon.ResultCompared to LCR migrants and LCR residents, Humpback Chub in western Grand Canyon had intermediate values for apparent survival, growth, and asymptotic length. Relatively high survival of subadults coupled with fast growth allowed for rapid population growth in western Grand Canyon. However, a large cohort in 2017 failed to lead to noticeable increases in adults. Seasonal survival patterns were distinct in all three groups, and apparent survival was lowest in western Grand Canyon during spring months. Adult Humpback Chub in western Grand Canyon were mobile and had a high probability of transience (i.e., just passing through the reach) and temporary emigration, demonstrating the need for future movement studies in western Grand Canyon to better distinguish emigration from survival.ConclusionThere is considerable spatial variability in viral rates for Humpback Chub in Grand Canyon. We discuss how observations are related to disparate temperature regimes experienced by the three groups and whether (how) the relationship between metabolism and temperature influences vital rates within the river network.

Investigating the Relationship Between Body Shape and Life History Traits in Toothed Whales: Can Body Shape Predict Fast-Slow Life Histories?

A widespread pattern in vertebrate life-history evolution is for species to evolve towards either fast or slow life histories; however, the underlying causes of this pattern remain unclear. Toothed whales (Odontoceti) are a diverse group with a range of body sizes and life histories, making them an ideal model to investigate potential drivers of this dichotomy. Using ancestral reconstruction, we identified that certain groups of odontocetes evolved more-streamlined, presumably faster, body shapes around the same time that killer whales (Orcinus orca) evolved into whale predators approximately 1 Mya during the Pleistocene. This suggests that the evolution of a streamlined body shape may have been an adaptation to escape killer whale predation, leading to longer life-history events. To test this hypothesis, we performed a cluster analysis of odontocete whales and confirmed the dual pattern of life-history traits, with one group referred to as ‘reproducers’ characterized by early age of maturity, short gestation, short interbirth interval, and short lifespan, and the other group referred to as ‘bet-hedgers’ exhibiting the opposite pattern. However, we found that life history grouping was relatively unrelated to whale shape (i.e., more streamlined or less streamlined). Therefore, we incorporated principal component results into mixed effects models, and the model results indicated that body shape was positively related to neonate length (a measure of investment in progeny), but not significantly related to the temporal life-history traits. Thus, whale body shape is not a sufficient explanation for the evolution of fast-slow life histories in odontocete whales.

Being Cared for and Growing Up Slowly: Parenting Slows Human Life History

SYNOPSIS Objective. For most animals, extrinsic mortality risks drive a fast life history (LH) strategy in which animals disregard risks and accelerate reproduction. Instead of perpetuating mortality driving fast LH, humans have reduced almost all mortality risks in living environments, resulting in a significant slowing of LH. Additionally, humans exhibit invested parenting which entails teaching their young survival or mortality reduction skills. Could parenting provide an additional pathway to the development and slowing of human LH? Design. Data reported here come from interviews and questionnaires administered to a community sample of 286 rural Chinese parents and their children when the children were on average 7, 8, and 11 years old. Results. Parental acceptance statistically mediates and moderates the longitudinal association between environmental adversities and children’s LH. Conclusions. Parenting breaks the species-general contingency between mortality conditions and fast offspring LH strategies and provides an additional pathway to the development and slowing of human LH.

Multiple co‐occurring bioeconomic drivers of overexploitation can accelerate rare species extinction risk

AbstractThe unsustainable harvest of species for the global wildlife trade is a major cause of vertebrate extinction. Through the anthropogenic Allee effect (AAE), overexploitation to extinction can occur when a species' rarity drives up its market price, enabling profitable harvest of all remaining individuals. Even in the absence of rarity value, however, the harvest of other species can subsidize the overexploitation of a rare species to the point of extinction, a phenomenon termed opportunistic exploitation. These two pathways to extinction have been considered independently, but many traded species experience them simultaneously.In this study, we develop a simple model that incorporates these mechanisms simultaneously and demonstrate that including multiple harvest strategies with market‐based feedbacks fundamentally alters rare species extinction risk and the rate at which overexploitation occurs. As a pertinent case study, we consider the harvest of ground pangolinsSmutsia temminckii.Our results show that pangolin extinction was generally associated with high rarity value, the use of multiple harvest strategies and the simultaneous harvest of a common species that has a fast life history. Pangolin population depletion and short‐term extinction risk were greatest when harvesters used a combination of pursuit and opportunistic (i.e. multi‐species) harvest strategies.Policy implications.Our results suggest that feedbacks between multiple financial incentives to overharvest can exacerbate the risk of extinction of rare species. As a result, continuing to address AAE and opportunistic exploitation as separate extinction pathways may insufficiently capture extinction risk for many exploited species. Criteria for assessing extinction risk or harvest sustainability of exploited species should incorporate multiple drivers of harvest pressure, with an expanded focus on including species with high rarity value that are exploited in multi‐species harvest regimes.

Getting old gracefully, and risk of dying before getting there: a new guide to theory on extrinsic mortality and senescence

Do environments or species traits that lower the mortality of individuals create selection for delaying senescence? Reading the literature creates an impression that mathematically oriented biologists cannot agree on the validity of George Williams' prediction (who claimed 'yes'). The abundance of models and opinions may bewilder those that are new to the field. Here we provide heuristics as well as simple models that outline when the Williams prediction holds, why there is a ‘null model’ where extrinsic mortality does not change the evolution of senescence at all, and why it is also possible to expect the opposite of William’s prediction, where increased extrinsic mortality favours slower senescence. We hope to offer intuition by quantifying how much delaying the ‘placement’ of an offspring into the population reduces its expected contribution to the gene pool of the future. Our first example shows why sometimes increased extrinsic mortality has no effect (the null result), and why density dependence can change that. Thereafter, a model with ten different choices for population regulation shows that high extrinsic mortality favours fast life histories (Williams) if increasing density harms the production of juveniles or their chances to recruit into the population. If instead increasing density harms the survival of older individuals in a population, then high extrinsic mortality favours slow life histories (anti-Williams). We discuss the possibility that empirically found Williams-like patterns provide indirect evidence for population regulation operating via harming the production or fitness prospects of juveniles, as opposed to the survival of established breeders.

High Social Mobility Leads to Delayed Reproduction.

Many important family decisions, such as when to have offspring, essentially manifest different life history strategies, ranging from slow to fast ones. The current research examined how one critical societal factor, social mobility (i.e., the shift of socioeconomic status in a society), may contribute to such slow (vs. fast) life history strategies. With four multi-method studies, including archival data at the national level, a large-sample survey (N = 6787), and experimental studies (N = 497), we found that a high level of social mobility predicted and resulted in delayed reproduction. Specifically, a high level of social mobility, indexed by both objective reality and subjective perception, predicted individuals' positive future expectations. This further leads them to focus on long-term goals and foster a slow life history strategy, i.e., preferring delayed reproduction. Theoretical implications are discussed.

Ground nesting in passerine birds: evolution, biogeography and life history correlates

Nest location is one of the key components of avian reproduction and sharp transitions between different nest location strategies may have profound ecological and evolutionary consequences. Here, we used a phylogenetically‐informed comparative framework to reconstruct the evolution of ground nesting behaviour in passerine birds, quantify its biogeographical and habitat variation, and test for its associations with life history traits. Our dataset comprised over 1600 species distributed worldwide and representing ca 90% of all extant passerine families. Our analyses revealed a scattered phylogenetic distribution and moderate phylogenetic signal in the occurrence of ground nesting in passerines. We also found relatively high forward and backward transitions rates between character states of ground and non‐ground nesting, indicating strong evolutionary lability. Non‐ground nesting was identified as a likely ancestral state at the root of passerine phylogeny. Occurrence of ground nesting was clearly associated with habitat variation, as open habitats generally supported greater proportion of ground nesting species than non‐open habitats (forests). Within the major habitat categories we found greater proportion of ground nesters in boreal and temperate than subtropical and tropical zones. This reflected a general latitudinal gradient in the occurrence of ground nesting, with higher proportion of ground nesting species at higher latitudes (especially at the northern hemisphere). Ground nesting was also associated with fast life histories, as ground nesters had larger clutches, shorter incubation periods and faster chick development rates than non‐ground nesters. This variation was possibly driven by higher predation rates on nestlings and adult birds in ground nesting species. Our study lays a foundation for a comprehensive understanding of mechanisms and processes that have driven macroevolution of ground nesting behaviour in the most species‐rich extant avian lineage.

Sexual Desire of Women With Fast and Slow Life History Throughout the Ovulatory Cycle.

Findings on female sexual motivation across the ovulatory cycle are mixed. Some studies have reported increased female sexual desire on fertile days or midway through the ovulatory cycle, whereas others have reported increased sexual desire on nonfertile days. We postulated and tested the hypothesis that the pattern of the cyclical change of female sexual desire is associated with women's life history. Female participants completed life-history measures and rated their levels of sexual desire on the survey day and reported the first day of their current and subsequent cycle, respectively (Study 1), or recorded their sexual desire throughout an entire cycle by submitting daily reports (Study 2). Results indicate that women with a fast life history experienced peak sexual desire midcycle, whereas women with a slow life history experienced two peaks of sexual desire midcycle and around their menses. These findings suggest that, consistent with the underlying life history, cyclically differential peaking of sexual desire may serve different reproductive functions.

Reproductive motivation in the context of the COVID-19 epidemic: Is there evidence for accelerated life history dynamics?

One of the key life history assumptions is that mortality rates are positively associated with fast life history dynamics. Since the COVID-19 pandemic has elevated mortality rates throughout the world, we tested this assumption using reproductive motivation (desired number of children and desired age of first reproduction) as a key output measure using a repeated cross-sectional design. We assessed reproductive motivation in Serbian young adults before the pandemic started (N = 362), during the pandemic-caused state of emergency (the peak of the epidemic's first wave: N = 389) and after the state of emergency (i.e., after the first wave: N = 430). Furthermore, in the third time-point we measured experiences during the state of emergency and additional measures of reproductive motivation (reasons for and against parenthood). Subsamples were matched by sex, education, and the sampling procedure. We found the between-group differences which are congruent with life history theory: the desired age of first reproduction was lowest after the state of emergency compared to the 2 previous time-points. However, there were no differences in the desired number of children. Furthermore, the analysis of the links between experiences during the epidemic and reproductive motivation yielded the results which are incongruent with life history theory-adverse experiences during the state of emergency were negatively related to the reproductive motivation. Since the findings were only partially in accordance with life history theory, we discuss possible reasons which may explain the heterogeneity of results. (PsycInfo Database Record (c) 2021 APA, all rights reserved) Impact Statement One of the key assumptions of life history theory is that elevated mortality rates should produce faster life history dynamics which should reflect in higher fertility. This hypothesis is important not only for understanding evolutionary processes in an ecological context but also for predicting demographic trends as well. This assumption was tested by examining the links between COVID-19 epidemic and reproductive motivation (desired number of children and desired age of first reproduction) in young adults. The results showed mixed support for the life history predictions and provide useful guidelines for future studies in this topic. (PsycInfo Database Record (c) 2021 APA, all rights reserved)

Testing the cognitive niche hypothesis with structural equation modeling: different dark traits predict an evening-chronotype in males and females

Dark triad (DT) refers to a set of antisocial and self-interested personality traits (Machiavellianism, sub-clinical psychopathy and narcissism). The nocturnal cognitive niche hypothesis suggests that the DT was advantageous in a nocturnal niche because it enables exploitative strategies and would be linked with an evening-oriented chronotype as part of a fast life history strategy. In the present self-report study (N = 300), this hypothesis was tested in a Brazilian sample. It was found that Machiavellianism was a predictor of this chronotype profile in females and secondary psychopathy was a predictor of this profile in males. Also, sex differences were replicated: on average, males exhibited “darker” personalities and more evening-oriented chronotype. Finally, these associations were tested with structural equation modeling controlling for sex and was found that the exploitative “darkcore” (psychopathy and Machiavellianism) predicts an evening-oriented chronotype. These results provide the first support for the nocturnal cognitive niche hypothesis in a non-WEIRD population.

Life history strategies, body surveillance, and online interpersonal sexual objectification experiences on women's body shame

According to the life history theory, fast life history strategists are more likely to prioritize mating efforts and concentrate on appearance to match mate preferences. This mate preference may have become the social ideal through sexual selection, thus causing body shame in women. Currently, the relationship between body shame and life history strategies, and how online interpersonal sexual objectification experiences as an external environment influence these relationships should be clarified. In the current study, a sample of 710 Chinese women participants completed self-report measures of life history strategies, body shame, body surveillance, and online interpersonal sexual objectification experiences. Results showed that life history strategies indirectly affected body shame through body surveillance. Furthermore, online interpersonal sexual objectification experiences played a moderating role. These findings emphasize the evolutionary factors of body shame from a life history theory perspective and the interactive effects of the external environment.

Living fast and driving fast. Life history strategies, personality, and aggressive driving

In this research, we proposed Life history theory as an underlying framework that should explain the link between personality and driving aggression. We hypothesized that agreeableness, conscientiousness, neuroticism, and the Dark Triad traits would mediate the relationship between fast life history strategies and aggressive driving. We relied on 448 participants (Mage = 31.75, SD = 12.08, 66.5 % women) that completed measures of life history strategies, Big Five factors, the Dark Triad traits, and driving aggression. We found that individuals high in fast life history strategies were also high in driving aggression. Those high in neuroticism, Machiavellianism, and psychopathy were aggressive behind the wheel and those high in agreeableness and conscientiousness were low in driving aggression. Psychopathy mediated the relationship between fast life history strategies and driving aggression. This may be explained by the fact that personality traits are broad behavioral adaptations that reflect life history strategies. In other words, life history strategies do not properly exist on their own on the behavioral level. They express behaviorally in terms of stable, cross-situational personality traits.

Size-selective harvesting affects the immunocompetence of guppies exposed to the parasite Gyrodactylus.

Harvesting is typically size-selective, targeting large individuals. This is expected to lead to reduced average body size and earlier maturation (i.e. faster life histories). Such changes can also affect traits seemingly unrelated to harvesting, including immunocompetence. Here we test four hypotheses on how harvesting affects immunocompetence based on the pace-of-life syndrome, habitat area limitation and energy allocation and acquisition, respectively. We empirically evaluate these hypotheses using an experimental system consisting of the ectoparasite Gyrodactylus turnbulli and lines of guppies Poecilia reticulata that had been subjected to either small, random or large size-selective harvest for over 12 years. We followed the infection progression of individually infected fish for 15 days. We found significant differences between the harvested lines: fish from the small-harvested lines had the highest parasite loads. During the early phase of the infection, parasite loads were the lowest in the large-harvested lines, whereas the terminal loads were the lowest for the random-harvested lines. These results agree with the predictions from the energetic trade-off and surface area hypotheses. To our knowledge, this is the first demonstration of the consequences of size-selective harvesting on immunocompetence.

The Position of Body Mass in a Network of Human Life History Indicator

Body mass is widely recognized as a morphological trait which is important for fitness optimization both in humans and other animals. Here, we propose that body mass is a part of fast life history trajectory – the fitness optimization pattern which emerges from harsh environment with a function to maximize reproductive output. To test this prediction, we measured body mass index (BMI) and a set of life history indicators in a large sample of reproductive individuals (N = 1,504; 32% males; Mage = 27.20; SD = 9.2). The data were collected via an online survey. Bivariate correlations showed that BMI was positively related to reproductive success, childhood poverty, and short-term mating success; furthermore, it was negatively associated to physical health, age of the first menarche, and economic reasons against reproduction. The Network Analysis confirmed that BMI is positively related to short-term mating success and reproductive success, and negatively to physical health and economic reasons against reproduction. Furthermore, centrality metrics showed that BMI has relatively low centrality indices, and thus represents a peripheral node in the network. The present data confirm that body mass is a morphological trait which participates in the fast life history trajectory of fitness optimization. A body mass which is slightly higher than population mean (but below obesity levels) probably represents an adaptive response to depriving economic conditions in childhood and contributes to the maximization of reproductive fitness. Finally, we highlight that the relations between body mass and life history may differ between and within species.

Zoonotic Disease Risk and Life-History Traits: Are Reservoirs Fast Life Species?

The relationship between humans, wildlife and disease transmission can be complex and context-dependent, and disease dynamics may be determined by idiosyncratic species. Therefore, an outstanding question is how general is the finding that species with faster life histories are more probable hosts of zoonoses. Ecological knowledge on species, jointly with public health data, can provide relevant information on species that should be targeted for epidemiological surveillance or management. We investigated whether mammal species traits can be good indicators of zoonotic reservoir status in an intensified agricultural region of Argentina. We find support for a relationship between reservoir status and the pace of life syndrome, confirming that fast life histories can be a factor of zoonotic risk. Nonetheless, we observed that for certain zoonosis, reservoirs may display a slow pace of life, suggesting that idiosyncratic interactions can occur. We conclude that applying knowledge from the life history-disease relationship can contribute significantly to disease risk assessment. Such an approach may be especially valuable in the current context of environmental change and agricultural intensification.

Is fast life history strategy associated with poorer self-regulation and higher vulnerability to behavioral addictions? A cross-sectional study on smartphone addiction and gaming disorder

Is fast life history strategy associated with poorer self-regulation and higher vulnerability to behavioral addictions? A cross-sectional study on smartphone addiction and gaming disorder

Too Many Males or Too Many Females? Classroom Sex Ratio, Life History Strategies and Risk-Taking Behaviors

Prior research finds that sex ratio, defined as the proportion of males and females in a given context, is related to engagement in risk-taking behaviors. However, most research operationalizes sex ratio at a local context (e.g., regional or county), which fails to reflect with precision the sex ratios contexts of individuals at a closer level. Furthermore, the relationship between sex ratio and risk-taking behaviors may be affected by individuals’ life history strategy, with previous studies showing fast life history strategies linked to risk-taking behaviors, compared to slow life history strategies. The present study analyzes the relationship between classroom sex ratio and risk-taking behaviors and the interaction between classroom sex ratio and life history strategy in adolescents. The sample comprised 1214 participants nested in 57 classrooms, 49.75% females, 91.5% Spanish and a mean age of 16.15 years (SD = 1.23, range 14–21). Results from multilevel modeling showed a negative relation between classroom sex ratio and risk-taking behaviors in female adolescents with faster life history strategy. By contrast, classroom sex ratio in male adolescents related positively to risk-taking behaviors but did not interact with life history strategy. These findings underscore the importance of studying proximate sex ratio on risk-taking behaviors in adolescents and underline its potential influence in the development and expression of life history strategies.

Fast, but not so furious. On the distinctiveness of a fast life history strategy and the common core of aversive traits

Evolutionary Psychology has considered a Fast Life History Strategy (FLHS), denoting an individual’s tendency to invest more resources in proliferation than in child-rearing, to be responsible for the emergence of aversive traits. Empirical evidence for this notion has been inconsistent, however. Herein, we tested whether FLHS is an adequate representation of the underlying disposition of aversive traits (N = 869). To this end, we considered twelve specific aversive traits, and additionally measured and modeled the common core of these traits. We found only weak correlations of FLHS with individual aversive traits as well as with their common core. In sum, the results suggest that the common core of aversive traits is only marginally reflected in FLHS.