Biological parameters and host preference of Tyrophagus putrescentiae (Schrank) on different Pleurotus ostreatus cultivars

Tyrophagus putrescentiae (Acari: Acaridae) is a destructive pest of edible fungi. Different species of edible fungi have variable effects on the growth, development and fecundity of T. putrescentiae, but it is unclear whether these effects exist in the same species. We used nine cultivars of the oyster mushroom (Pleurotus ostreatus) to evaluate the development and reproduction parameters of T. putrescentiae at 26 ± 1°C and 80 ± 5% humidity. Different P. ostreatus cultivars had significant effects on the immature stages, female fertility, and reproductive lifespan. Total egg-to-adult development time ranged from 10.0 ± 1.2 d (on Po389 cultivar) to 12.5 ± 1.0 d (on Po62 cultivar). Mite mortality ranged from 54.3 ± 4.2% (on Po86 cultivar) to 100.0 ± 0.0% (on Po62 cultivar). The number of eggs laid per female ranged from 3.2 ± 0.4 (on Po45 cultivar) to 9.1 ± 1.1 (on Po86 cultivar). The average lifespan of females ranged from 3.0 ± 0.5 d (on Po45 cultivar) to 16.3 ± 1.7 d (on Po86 cultivar). Host preference of the mite was significantly different among the nine cultivars with a preference for cultivars Po65, Po80, Po389, and Po86. These results indicate that P. ostreatus cultivars significantly affect the biology of T. putrescentiae and the relationship between mite damage and mushroom yield.

Capability in Research on Cognition and Well-being in Ageing and Retirement

In this chapter, we outline our thoughts on capability in relation to previous and ongoing research projects conducted by the Adult Development and Ageing (ADA-Gero) Research Group located at the Department of Psychology, University of Gothenburg, Sweden. More specifically, we relate our research on cognitive ageing and subjective well-being to the overarching capability framework implemented as a theoretical platform in the AgeCap research consortium.

“I Just Can’t”

This chapter explores the social and emotional development of emerging adults and focuses on how it contributes to feelings of anxiety, inability to make decisions, uncertainty, and lack of belonging. It provides information on how identity impacts mental health, particularly during this developmental stage. Various theories are discussed, with information provided on the role of the social-cultural content. The Miami Adult Development Project serves as a case study of an identify-focused intervention with mental health outcomes. Guiding questions help readers better understand the role identity development plays in risk and resilience during this “age of uncertainty.”

Age Differences in Positive Event Appraisals during COVID-19: Evidence from a Daily Diary Study

Multiple studies suggest that community-dwelling older adults are psychologically resilient in the face of the COVID-19 pandemic. Notably, during the initial weeks of the COVID-19 outbreak, older age was associated with engaging in more daily positive events (Klaiber et al., 2021, Journal of Gerontology: Psychological Sciences). We followed up on these findings by exploring age differences in positive event appraisals during the COVID-19 pandemic. During the 7-day diary study conducted between March and August 2020, 1036 participants (mean age = 45.95, SD = 16.04, range = 18-91) reported their positive events in nightly surveys. If at least one positive event occurred, participants rated their appraisals of the event on the following dimensions: importance, calmness, happiness, gratitude, personal responsibility, and control. Older adults (60 years+) rated their positive events to be more personally important and felt more calm and happy during these events, compared to younger (18-39 years) and middle-aged adults (40-59 years). Furthermore, older adults felt more grateful during positive events compared to younger but not middle-aged adults. There were no age differences in feelings of control or personal responsibility for positive events. These findings highlight the importance of daily positive events for older adults during a time of major stress. In line with theories on adult development, daily positive event processes in older adults are characterized by valuing positive and meaningful social connections, as well as a greater degree of positive event-specific emotions such as feeling calm, happy, and grateful.

Socioemotional Goals and Definitions of Emotion Terms: A Qualitative Analysis Across Age

Major theories of adult development posit that knowledge about emotion might evolve across the lifespan. Socioemotional Selectivity Theory (SST) and the Strength and Vulnerability Integration (SAVI) models imply that the manner in which older (OA) and younger adults (YA) conceptualize emotions may differ in valence, arousal, reference to social partners, time perspective, and the self. Quantitative accounts of age differences in conceptualizations of emotion-terms offer mixed support for theoretical expectations, but many predictions have yet to be tested qualitatively. In this study, 90 OA and 210 YA provided narrative descriptions of 11 (5 positive, 6 negative) emotion-terms. Responses were coded on valence, reference to self/others, and arousal. O/YA used similar synonyms to define emotion-terms. As predicted, YA used high arousal language in their definitions of negative (OR = 10.29, p = 0.018) and positive terms more than OA (i.e. Happy: OR = 1.27, p<0.001); OA referenced other persons such as family and friends (pos: OR = 0.13, p<0.001; neg: OA = 0.32, p=0.002) more than YA. Contrary to predictions, OA self-referenced more often than YA in positive (OR = 0.12, p=0.001) and negative definitions (OR= 0.11, p=0.004); this may be attributed to OA providing more situational examples in their responses than YA. Somewhat consistent with SAVI and SST, OA may reference high-arousal states less when conceptualizing emotions and associate their definitions more with social partners than YA. Future research should address OA greater use of situational examples when defining emotion terms, motivational factors and emotional impact of these age differences.

Cognition-Mortality Associations Are Stronger When Estimated Jointly in Longitudinal and Time-to-Event Models

Objectives With aging populations worldwide, there is growing interest in links between cognitive decline and elevated mortality risk—and, by extension, analytic approaches to further clarify these associations. Toward this end, some researchers have compared cognitive trajectories of survivors vs. decedents while others have examined longitudinal changes in cognition as predictive of mortality risk. A two-stage modeling framework is typically used in this latter approach; however, several recent studies have used joint longitudinal-survival modeling (i.e., estimating longitudinal change in cognition conditionally on mortality risk, and vice versa). Methodological differences inherent to these approaches may influence estimates of cognitive decline and cognition-mortality associations. These effects may vary across cognitive domains insofar as changes in broad fluid and crystallized abilities are differentially sensitive to aging and mortality risk. Methods We applied each of the above analytic approaches to data from a large-sample repeated-measures study of older adults (N = 5,954, of whom 4,453 deceased; ages 50–87 years at assessment). Results Cognitive trajectories indicated worse performance in decedents and when estimated jointly with mortality risk, but this was attenuated after adjustment for health-related covariates. Better cognitive performance predicted lower mortality risk, and, importantly, cognition-mortality associations were stronger when estimated in joint models. Associations between mortality risk and crystallized abilities only emerged under joint estimation, confirming the greater power of this statistical approach. Discussion These results suggest that joint estimation of cognition-mortality associations may be beneficial for research in cognitive epidemiology and cognitive reserve in adult development.

Awareness of Balance as an Intraindividual Dynamic of Objective and Subjective Experiences of Fall Risk in Daily Life

Falls are life-changing events in older adulthood. With an accurate understanding of balance, older adults can adapt to age-related changes in physical ability without prematurely restricting physical activity. The Daily Balance Project examines the implications of older adults’ awareness of fall risk in daily life. For 30-consecutive days, following a fall-risk assessment, 40 older adults used a smartphone to report balance confidence and then perform four balance assessment and a 30-second sit-to-stand task to measure postural sway and fall-risk. Measures of postural sway showed greater intraindividual variability than balance confidence and fall risk. Multilevel models showed that awareness of balance fluctuated during the study and varied across individual differences in baseline fall-risk. Baseline fall risk also differentiated how balance confidence and postural sway were linked to subsequent momentary fall risk assessments. The findings are discussed within the framework of action-perspectives of adult development and awareness of aging.

Identity, Integrity, and Religious Doubt in Later Life

Erik Erikson argued that for religiously involved individuals, the resolution of two stages – Identity vs. Role Diffusion and Integrity vs. Despair – are of critical importance in adult development. Adults typically confront their parents’ religious affiliation in adolescence and young adulthood as they establish themselves as independent actors in the world, and in later life, older adults confront their own lived lives, and evaluate in light of their religious commitments whether they have lived meaningfully and with integrity. To examine Erikson’s views of religious development, we completed open-ended interviews of 278 community-dwelling older adults (55-101 years). In these interviews, participants describe the development of their religious faith, the nature and development of their religious questioning and doubt, and the relationship between their faith and doubt over their life span. Participants were from Northeast U.S., and were denominationally, racially, and ethnically diverse. More extensive religious doubts were reported during young adulthood regarding the meaningfulness of religion in their family of origin. By contrast, religious doubts are reported less during later life, and more emphasis is placed on the value of religious involvement for themselves and their families. This pattern varies between young-old (under 75 years) and old-old (over 76 years): whereas the young-old seem to be working through their religious doubts, the old-old are more focused on the value of their religious faith. These findings are discussed in terms of Erikson’s developmental theory and with respect to cohort differences in religious belief and practice.