Sexual selection typically centers on bodily & psychological traits; non-bodily ones (housing, vehicles, art, social media, &c) can, however, influence sexual selection even in absence of the phenotype proper; these are "extended phenotypic traits"

An Updated Theoretical Framework for Human Sexual Selection: from Ecology, Genetics, and Life History to Extended Phenotypes. Severi Luoto. Adaptive Human Behavior and Physiology, https://link.springer.com/article/10.1007%2Fs40750-018-0103-6

Abstract

Objectives: Sexual selection typically centers on bodily and psychological traits. Non-bodily traits ranging from housing and vehicles through art to social media can, however, influence sexual selection even in absence of the phenotype proper. The theoretical framework of human sexual selection is updated in this article by unifying four theoretical approaches and conceptualizing non-bodily traits as extended phenotypic traits.

Methods: Existing research is synthesized with extended phenotype theory, life history theory, and behavioral ecology. To test population-level hypotheses arising from the review, ecological and demographic data on 122 countries are analyzed with multiple linear regression modelling.

Results: A four-factor model of intelligence, adolescent fertility, population density, and atmospheric cold demands predicts 64% of global variation in economic complexity in 1995 and 72% of the variation in 2016.

Conclusions: The evolutionary pathways of extended phenotypes frequently undergo a categorical broadening from providing functional benefits to carrying signalling value. Extended phenotypes require investments in skills and bioenergetic resources, but they can improve survival in high latitudes, facilitate the extraction of resources from the environment, and substantially influence sexual selection outcomes. Bioenergetic investments in extended phenotypes create individual- and population-level tradeoffs with competing life history processes, exemplified here as a global tradeoff between adolescent fertility and economic complexity. The merits of the present model include a more systematic classification of sexual traits, a clearer articulation of their evolutionary-developmental hierarchy, and an analysis of ecological, genetic, and psychological mechanisms that modulate the flow of energy into extended phenotypes and cultural innovations.

Keywords: Economic complexity Evolutionary-developmental psychology Extended phenotype Human behavioral ecology Innovation Intelligence Life history theory Non-bodily ornament Sexual selection Theory unification

Contrary to expectations, we report benefits experienced by some amphibian populations breeding and dwelling in proximity to roads: Better locomotor performance & higher measures of traits related to fitness

Fitter frogs from polluted ponds: the complex impacts of human‐altered environments. Steven P. Brady et al. Evolutionary Applications, https://doi.org/10.1111/eva.12751

Abstract: Human‐modified habitats rarely yield outcomes that are aligned with conservation ideals. Landscapes that are subdivided by roads are no exception, precipitating negative impacts on populations due to fragmentation, pollution, and road kill. Although many populations in human‐modified habitats show evidence for local adaptation, rarely does environmental change yield outright benefits for populations of conservation interest. Contrary to expectations, we report surprising benefits experienced by amphibian populations breeding and dwelling in proximity to roads. We show that roadside populations of the wood frog, Rana sylvatica, exhibit better locomotor performance and higher measures of traits related to fitness compared with frogs from less disturbed environments located further away from roads. These results contrast previous evidence for maladaptation in roadside populations of wood frogs studied elsewhere. Our results indicate that altered habitats might not be unequivocally detrimental, and at times might contribute to metapopulation success. While the frequency of such beneficial outcomes remains unknown, their occurrence underscores the complexity of inferring consequences of environmental change.

The smartphone is the closest device to us, above classmates, colleagues, flatmates; trust & preoccupation mediate the relationship between closeness to the smartphone & stress and coping

Smartphones as digital companions: Characterizing the relationship between users and their phones. Astrid Carolus et al. New Media & Society, https://doi.org/10.1177/1461444818817074

Abstract: Based on the idea of computers constituting social agents and referring to core characteristics of human–human relationships, this study introduces the concept of a digital companionship between smartphone users and their devices. Constituting characteristics (closeness, trust, preoccupation) and outcomes (stress, coping with stress) of social relationships were adapted to yield a model of human–smartphone relationships for empirical testing. A cross-national sample of participants (n = 1156) completed an online study, which included self-report measures as well as a newly developed instrument (Positioning Others and Devices [POD]) assessing the closeness to technical devices and social actors. Results showed the smartphone to be the closest device. Furthermore, structural equation modeling lent support for the theoretical model indicating that trust and preoccupation mediate the relationship between closeness to the smartphone and stress and coping. Findings support the concept of companionship as a fruitful approach to explain smartphone-related behaviors.

Keywords: Digital companion, human–smartphone relationship, mobile devices, relationship, smartphone