Early Adulthood Research Articles

The mediating role of self-control on the relations between adverse childhood experiences and substance use among adolescents in Uganda.

Adverse childhood experiences (ACEs) are established risk factors for undesirable consequences in adolescence and early adulthood, including substance use and a lack of self-control. Based on the Social Bonds Theory (SBT), this study aims to expand our knowledge of the pathways from ACEs and self-control to substance use in adolescence and early adulthood. The extent to which self-control mediates the association between ACEs and substance use was examined in a cross-sectional survey of 358 adolescents and young adults (N = 234, 65.5% girls, mean age 17.7, SD 0.58, range 15-18). Data were gathered using the Adverse Childhood Experiences (ACE-10) questionnaire, the Drug Abuse Screening Test (DAST-10), and the 10-item self-control scale to assess childhood adversity, substance use, and self-control, respectively. ACEs were widely reported and significantly associated with substance use and a lack of self-control. Self-control strongly predicted substance use, independent of ACEs. Among those reporting no ACEs, one to two, three to four, and five or more, there were significant variations in the respondents' substance use (F(3, 400) = 12.69, p = 0.001). Self-control explained 51.2% (95% confidence interval [CI]: 41, 61%) of the associations between ACEs and substance use as assessed by linear regression. Self-control is key to understanding why adolescents and young adults with a history of childhood adversity indulge in substance use. Therefore, there is a need to advocate for psychological interventions such as cognitive and behavioural therapy that have demonstrated efficacy in promoting self-control in adolescents and young adults.

Development of Restricted and Repetitive Behaviors from 2-19: Stability and Change in Repetitive Sensorimotor, Insistence on Sameness, and Verbal Behaviors in a Longitudinal Study of Autism.

This study examined trajectories of repetitive sensorimotor (RSM), insistence on sameness (IS), and verbal RRBs from ages 2-19 in a well-characterized longitudinal cohort. We also tested the factor structure of the ADI-R restricted and repetitive behavior (RRB) domain at age 19 and the inclusion of a verbal RRBs factor, in addition to previously identified RSM and IS factors, at ages 9 and 19. The ADI-R was administered to 193 participants at five timepoints from 2 to 19. Confirmatory factor analysis (CFA) was used to examine the factor structure of ADI-R RRB data. Change in RRB subtypes was examined using group-based trajectory modeling and multilevel modeling. RSM and IS behaviors generally decreased from 2 to 19, with some participants experiencing increases from ages 2-9. 46.46% of participants experienced increasing verbal RRBs from 2 to 9, followed by a plateau from 9 to 19. The remaining participants had few to no verbal RRBs throughout development. Multilevel modeling indicated ADOS CSS scores were associated with change in RSM trajectories only. Child IQ was not associated with change in any RRB trajectories. CFA indicated previously-derived RSM and IS factors fit age 19 ADI-R data well. The inclusion of a third factor, verbal RRBs, worsened goodness-of-fit statistics and was ultimately omitted. Our findings suggest the RRB factor structure of the ADI remains consistent into early adulthood and illustrate developmental continuity and change in RRBs. For autistic individuals with fluent speech, RRB presentation may be influenced by verbal ability in ways that are highly variable, but clinically meaningful.

Correlation between Rice Weevil Infestation Sitophilus oryzae (Linnaeus) and Seed Quality Parameters of Maize (Zea mays. L) Seed

The experiment was conducted at the Seed Research and Technology Centre, PJTSAU, Rajendranagar, Hyderabad, to investigate the impact of Sitophilus oryzae on the seed quality parameters of maize. Samples weighing 500g of maize variety DHM-117 were placed in plastic jars in three replications S. oryzae adults of 0, 5, 10, 15, and 20 pairs were separately released into each replicate of the maize seeds then these jars were placed in an incubator set at 25°C and 75% humidity. These jars were covered with lids equipped with aeration facilities. The adult emergence, germination percentage and moisture content were evaluated every two months six months. An inverse correlation was observed between adult emergence with germination percentage and seedling vigour index while, adult emergence showed a positive correlation with moisture content.

Exploring Risk Factors of Suicidal Behaviour among Medical Professionals in the UK: A Retrospective Analysis of Online News Portals

Suicide is a significant global health burden. The demanding nature of the healthcare profession, combined with unique stressors and challengses, puts medical professionals at risk of mental health difficulties, including suicidal ideation and attempts. This study aims to investigate suicidal behaviour among medical professionals in the United Kingdom by reviewing online news portals and focusing on the risk factors associated with suicide. Seven online news portals from the UK were purposefully selected for the study, focusing on news reports of suicides among medical professionals. Only English online news portals were chosen, as English is the standard language in the country. Out of the 61 reports, 37.7% of the reported suicides were among males, and 62.3% were among females. The age distribution of the suicide reports revealed that the majority of the cases are within the 20-30 age range (42.6%). Mental health issues and fear of losing their job were also prominent reasons (24.6%). Suicide among healthcare professionals in the United Kingdom has drawn little attention. Suicide is more prevalent in early adulthood and among female professionals. Nurses, doctors, and junior doctors are more likely to commit suicide.

Bullying Victimization as an Adverse Experience for Psychosocial Adjustment among Irish Adolescents

AbstractThis study investigates the long-term effects of victimization from middle adolescence to late adolescence and early adulthood, examining emotional and behavioral problems, peer relationships, and smoking habits and sleeping difficulties. The study also explores how these outcomes can persist into early adulthood, taking into consideration early victimization experiences, gender, cognitive ability, and family social class. The total sample included 7525 participants, spanning the ages of 13, 17, and 20, from the Child Cohort of the Growing Up in Ireland study (48.9% male). The path analysis model suggests that victimization is associated with behavioral problems at age 17, and it is also linked to emotional problems and sleeping difficulties at both ages 17 and 20. Additionally, sleeping difficulties, smoking habits, and indices of emotional and behavioral adjustment exhibit some stability between ages 13 and 17, as well as 17 and 20. Theoretical and practical implications are discussed.

Pubertal timing and health-related behaviours in adolescence - socio- economic outcomes in a follow-up study from Finland

Background. Pubertal timing is connected with health-related lifestyle in adulthood. We studied whether early or late pubertal timing is predictive of socio-economic outcomes in early adulthood and whether the associations are mediated by health behaviours. Methods. Survey data (1981, 1983, 1985, 1987) from samples of 14-year-old Finns (N=4246, response rate 85%) were linked with respondents’ attained educational level, socio-economic and labour market position in 2001 (ages 28-34). Ages of menarche and first ejaculation indicated pubertal timing. Results. As compared to adolescents with average age pubertal timing, boys and girls maturing at an early age more often participated in health-compromising behaviours, while those maturing at a later age participated less frequently. Pubertal timing was not associated with attained educational level or socioeconomic position in girls and not with labour market position at the time of follow-up in either sex. In boys, independently of health behaviours, early or late onset of puberty predicted low educational level, while late onset predicted low socio-economic position. Conclusion. Timing of puberty has a stronger connection with socio-economic outcomes in boys than in girls. Deviance from the normative pace of physical development, especially late maturation, is among boys slightly depicted in the hierarchy of socio-economic positions of the society. As pubertal timing is connected with health-related behaviours – especially with smoking – the pacing of developmental transitions should be considered in planning programmes preventing unhealthy behavioural patterns often linked with negative attitudes towards schooling.

Neurological dysfunction screening in a cohort of adolescents with type 1 diabetes: a six-year follow-up.

Diabetic neuropathy (DN) is one of the most insidious microvascular complications in patients with type 1 diabetes (T1DM) and initial signs may appear during childhood. The aim of this study is to evaluate associations between the Nerve Conduction Studies (NCS) outcomes at enrollment with neuropathy screening questionnaires performed six years later in a cohort of asymptomatic adolescents followed up until early adulthood, affected by T1DM. We performed NCS in a cohort of seventy-two adolescents with T1DM and eighteen healthy controls. Six years later, screening questionnaires for DN were proposed: Michigan Neuropathy Screening Instrument (MNSI, specific for symptoms of somatic dysfunction), Composite Autonomic Symptom Score 31 (COMPASS 31, specific for abnormalities of the autonomic component) and Clarke questionnaire (perception of hypoglycemia). Thirty-two TD1M subjects agreed to participate in the follow-up; main clinical-metabolic parameters, including the number of episodes of hypoglycemia in the past twelve months, were collected. 11.8% of subjects showed changes compatible with DN through the MNSI questionnaire, while 41% declared a reduced perception of hypoglycemia on the Clarke questionnaire. No significant correlation was observed between the clinical-metabolic parameters or altered response to NCS and scores of MNSI and COMPASS 31 questionnaires. On the other hand, an association was observed between NCS abnormalities and a high number of hypoglycemic events after six years (97-fold increased risk, p = 0.009). The frequency of somatic alterations in the study population is 11.8%, whereas the frequency of symptoms correlated with autonomic damage is about 41%. An autonomic impairment recorded at NCS may represent a six-year risk factor for increased hypoglycemic episodes, even if more extensive studies are needed to investigate this possible relationship further.

Associations of body composition with physical activity, nutritional intake status, and chronotype among female university students in Japan

BackgroundHaving higher muscle mass in early adulthood is an important factor in preventing sarcopenia. However, university students undergo lifestyle changes compared to their high school years, which may lead to changes in body composition, such as an increase in body fat and a decrease in muscle mass. The study aimed to investigate the association between body composition and lifestyle behaviors, including chronotype, among Japanese female university students, due to the prevalence of underweight among young females in the country.MethodsThe physical activity level (PAL), daily dietary intake status, morningness-eveningness questionnaire (MEQ) score, and body composition of 230 students were assessed in this cross-sectional study. Body composition was measured using a multifrequency bioelectrical impedance analyzer, and body mass index (BMI), body fat percentage (%BF), and skeletal muscle mass index (SMI) were determined.ResultsIndividuals who were evening type (ET) had a higher %BF and lower SMI than those who were non-ET, but no differences in body weight or BMI were found. Although ET individuals had lower total energy intake, protein intake, and PALs than non-ETs, the differences were small. However, multiple regression analyses showed that SMI was significantly positively associated with MEQ and PAL, and %BF was significantly negatively associated with MEQ and PAL.ConclusionThese results suggest that female university students with lateness of chronotype and low physical activity have a body composition imbalance resulting in higher body fat and lower muscle mass. Therefore, young females may need to take chronotype-specific measures (especially ET individuals) to help them maintain an appropriate body composition.

Predictors of lung function in early adulthood: A population-based cohort study.

Lung function reaches a peak/plateau in early adulthood before declining with age. Lower early adult lung function may increase the risk for chronic obstructive pulmonary disease (COPD) in mid-late adult life. Understanding the effects of multiple childhood/adolescent exposures and their potential interactions on plateau lung function would provide insights into the natural history of COPD. Longitudinal spirometry data from 688 participants with complete data from a population-based birth cohort (original n = 1037) were used to investigate associations between a wide range of childhood/adolescent exposures and repeated measures of FEV1, FVC and FEV1/FVC during the early-adult plateau phase. Generalized estimating equations were used to accommodate the multiple timepoints per participant. FEV1 reached a peak/plateau between ages 18 and 26 and FVC from 21 to 32 years, whereas FEV1/FVC declined throughout early adulthood. Childhood asthma and airway hyperresponsiveness were associated with lower early adult FEV1 and FEV1/FVC. Smoking by age 18 was associated with lower FEV1/FVC. Higher BMI during early adulthood was associated with lower FEV1 and FVC and lower FEV1/FVC. Physical activity during adolescence was positively associated with FEV1 and FEV1/FVC but this was only statistically significant in men. There was no convincing evidence of interactions between exposures. Childhood asthma and airway hyperresponsiveness are associated with lower lung function in early adulthood. Interventions targeting these may reduce the risk of COPD in mid-late adult life. Promotion of physical activity during adolescence, prevention of cigarette smoking and maintenance of a healthy body weight in early adulthood are also priorities.

Emerging Adult Mental Health Resource Access, Use, and Sufficiency During COVID-19

Purpose While Emerging Adults (EAs) report the highest rates of psychopathology, age-related barriers to access and use of mental health resources (MHR) leave many EAs to struggle. Contextualized within the COVID-19 pandemic, the present study explores factors related to EAs’ perceptions of access, use, and sufficiency of MHR. Method Four hundred twenty-three EAs enrolled in post-secondary education at the onset of the pandemic were recruited for an online survey. An age-related COVID questionnaire and multiple empirically validated measures were used to assess mental health status and MHR use throughout the pandemic. Results Those who reported Reduced or Eliminated Access to MHR during the pandemic were likely to have experienced at least one Change in Residence. Reduced or Eliminated Access to MHR and higher levels of depression accounted for the greatest variance in MHR Sufficiency. Conclusion This study underscores the importance of efforts to expand access to MHR amongst EAs.

Resilience and Psychological Distress in Early Adulthood with Non-Suicidal Self-Injury: A Scoping Review

According to Orenstein & Lewis (2021), young adults are at a transitional age and have demands on developmental tasks. When these demands are not met, it can cause feelings of suffering, activities that become obstacles and characterized by symptoms of anxiety and depression or called psychological disorders (Kalia & Knauft, 2020; Dharma et al, 2020). Psychological distress that are not balanced with adaptive problem solving can cause maladaptive distress, it called non-suicidal self-injury (Rahmasari, 2021). According to Hans et al (2022) bounce back is needed in young adults, so they can face the problem, or it called resilience. In the previous study by Khan & Ungar (2021), there were limited matters such as the search for coping strategies carried out by the sample in the study and protective factors from the emergence of self-harm and the non-specific definition of NSSI. Aims:identification research on resilience and psychological distress in young adults with NSSI. Method:scoping review. Result: 10 journals that met the inclusion criteria were selected. Hypothesis of this study is the results of the study indicate that the conditions of psychological distress in young adults with NSSI have low resilience and high levels of psychological distress. The benefits of this research theoretically are to enrich scientific references in the field of clinical psychology, especially regarding resilience and psychological disorders in young adults with NSSI and practically this research can be continued by taking into account several limitations and can be developed into interventions for young adults with NSSI.

Systemic defense induced by fatty acid compounds from marine macroalgae, Chaetomorpha antennina in tomato (Solanum lycopersicum) plants alters the susceptibility of the polyphagous agricultural pest, Spodoptera litura Fab

BackgroundSeaweeds contain a widespread range of fatty acids (FA), and several of them have potential bioactivity. FAs are dynamic members of all biota, as well as being acknowledged for their critical function in initiating phytohormone interactions and acting as important participants in many defense signalling pathways of the plant system. The current study looks at the defense-eliciting potentials of fatty acids from the green seaweed Chaetomorpha antennina (Bory) Kützing and their impact on the polyphagous insect pest Spodoptera litura (Fab).ResultsThe seaweed was detected with 19 fatty acids, with larger proportion of hexa and octadecanoic and linoleic acids. The algal fatty acid compounds (CFA) were successful in eliciting salicylic acid and phenolic compounds biosynthesis along with defense enzymes peroxidase (PO) and polyphenol oxidase (PPO). CFA enhanced the synthesis of defense enzymes, PO and PPO and phenols, post infestation with S. litura (> 50%) compared to control plants exposed to the pest. CFA was also effective in causing direct mortalities (96–98%) to the larvae (II-V instars). S. litura larvae exposed to elicited tomato plants displayed physiological incursions that extended larval-pupal duration to 26–28 days, preventing both morphogenetic transitions as well as affecting their morphology, that lead to the emergence of adults with malformed wings, legs. As a consequence, the fecundity was reduced by 60% affecting the reproductive performances of second-generation adults. The consumption rate (RCR) of larvae exposed to CFA was decreased by 84%, depicting feeding deterrence. These larvae were also observed with > 50% reduction in the levels of phosphatase enzyme secretion, bringing down larval growth rate from 0.58 to 0.34 mg/day. Histological analysis of exposed larvae displayed midgut cell disruption.ConclusionHence, the study finally confirms the elicitor potentials of fatty acid compounds from C. antennina, by inducing natural systemic defenses. This investigation unlocks novel forecasts besides delivering an unconventional method for crop protection to moderate or interchange the solicitation of chemical pesticides.Graphical

The Relationship Between Gratitude and Resilience among Young Adults

This study looks into the complex connection between resilience and thankfulness in young adults. Gratitude is a good feeling that is felt when one receives advantages from others. It has been studied extensively in psychology because it may play a role in promoting psychological well-being. Conversely, resilience is the capacity to overcome hardship and preserve mental well-being in the face of difficulties. Although these concepts have been connected to different facets of mental health on their own, there is still much to learn about how they interact and may have an impact on one another, especially in the setting of early adulthood. Findings from this study aim to contribute to a better understanding of the mechanisms underlying psychological resilience in young adults, shedding light on the potential role of gratitude as a protective factor against adversity

Ecology and life cycle of the filter-feeding Amphipsyche meridiana Ulmer 1902 (Trichoptera: Hydropsychidae) in an irrigation canal, central Thailand

Ecology and life cycle of the filter-feeding Amphipsyche meridiana Ulmer 1902 (Trichoptera: Hydropsychidae) in an irrigation canal, central Thailand

Job performance and associated factors among nurses working in adult emergency departments at selected public hospitals in Ethiopia: a facility-based cross-sectional study

BackgroundOptimizing the performance level of nursing staff is crucial for the efficient functioning of hospitals and better patient health outcomes. However, published data on the job performance levels and associated factors of nurses in Ethiopia is limited. Therefore, this study aimed to assess the job performance and associated factors of nurses working in adult emergency departments at selected public hospitals in Addis Ababa, Ethiopia.MethodsA facility-based cross-sectional study was conducted from March 25 to April 25, 2023, among 172 nurses working in the adult emergency departments of selected public hospitals in Addis Ababa, Ethiopia. A simple random sampling technique was used to select the study participants. Data were collected using pretested, self-administered structured questionnaires. Data were coded, entered into Epi-data version 4.6, and analyzed using Statistical Package for Service Solution (SPSS) Version 27.0.1 software. Data were summarized using descriptive statistics, including mean, frequency, and standard deviation. A binary logistic regression analysis was done to determine factors associated with the performance of nurses. The strength of the association was measured using an adjusted odd ratio (AOR) with a 95% confidence interval (CI), and a P-value < 0.05 was considered statistically significant.ResultsThe majority of nurses, 70.5% (95% CI: 63.7–77.3), rated their job performance as good. Workload [AOR = 1.70 (95% CI: 1.19–2.44)], remuneration [AOR = 1.89 (95% CI: 1.35–2.67)], rewards [AOR = 1.50 (95% CI: 1.01–2.23)], objectives to be achieved [AOR = 1.88 (95% CI: 1.32–2.67)], and feedback on performance appraisals [AOR = 1.65 (95% CI: 1.17–2.33)] were identified as significantly associated with nurses’ performance.ConclusionWhile the majority of nurses rated their job performance as good, it is important to note that a relevant proportion of nurses rated their job performance as poor. The findings of this study identified that nurses’ performance is influenced by several key factors, including workload, remuneration, rewards, objectives to be achieved, and feedback on performance appraisals. Our findings call for improving nurses’ job performance; therefore, hospitals should consider implementing systems that effectively utilize performance appraisal results and recognize and encourage hardworking nurses.

Comparative analysis of ovarian linear dimensions in adult and early old age women using sonography data

Aim – to study the dynamics of ovarian parameters in women from the first period of adulthood to early old age measured by sonography. Material and methods. The study used the results of an ultrasound examination of 81 women with normal pelvic dimensions, without reproductive organ pathology, having maximum two pregnancies in life history more than one year before the study. All participants gave their consent to routine examination. The procedure consisted of measuring the length, width, anteroposterior size and volume of the ovaries by transvaginal access according to standard protocols. The subjects were divided into three groups according to anatomical age classification. The first group consisted of 29 early adulthood women (22 to 35 years); the second group included 23 women in middle adulthood (36 to 56 years) and 29 early old age women (57 to 73 years). Results. All the ovarian parameters decreased by early old age (p 0.01). At the same time, a trend towards macroanatomic asymmetry of the ovaries with larger dimensions in the right side was revealed in each of the studied age periods (p 0.05). Conclusion. The results of a lifetime comparative analysis of the anatomical dimensions of the ovaries in women contribute to the knowledge of their age-specific structure and requires a future detailed study. A new knowledge is required to develop modern methods for preventing pathologies of the female reproductive system and to provide timely, high-quality medical care.

The relationship between social capital and inflammatory biomarkers in early adulthood: A longitudinal study.

Higher levels of social capital (SC) are associated with better health status. However, there is little evidence of the impact of SC on biological health outcomes in the early ages. To identify the association between SC in adolescence and inflammation levels in early adulthood. Prospective study using data from 2435 participants from the Epidemiological Health Investigation of Teenagers in Porto cohort. SC was assessed at age 17 through a self-administered questionnaire, and high-sensitivity C-reactive protein (hs-CRP) and leucocytes were measured in a fasting blood sample at 17 and 21 years-old. A principal components analysis was performed to identify the domains of SC. Simple linear regressions were performed to assess the association between SC components and inflammatory status at 17 and 21years old. Pathway analysis was performed to assess the direct, indirect, and total effects of SC on hs-CRP and leucocyte levels. We did not find a significant total effect between SC at 17 years-old and hs-CRP at 21 years-old. However, the Trust/Reciprocity dimension showed a significant direct effect between SC and hs-CRP levels at 21 (β=-0.065, 95% CI: -0.129; -0.001), as well as a significant total effect (β=-0.075, 95% CI: -0.139; -0.011). Regarding leucocyte levels, total SC at 17 years-old was associated with leucocytes levels at 21 (β=-0.115, 95% CI: -0.205; -0.024). Significant direct (β=-0.104, 95% CI: -0.194; -0.014) and total effect (β=-0.107, 95% CI: -0.199; -0.015) of Trust/Reciprocity on leucocyte levels were observed. Adolescents with higher SC have a low inflammatory level in early adulthood, especially those with greater levels of trust/reciprocity.

Insecticidal, biochemical and histological effects of monoterpenes against Musca domestica (Diptera: Muscidae)

The insecticidal activity of ten monoterpenes against larvae of Musca domestica (Diptera: Muscidae) was evaluated. Monoterpenes were mixed with food-media at concentrations of 2.5, 5.0, 10.0, 25.0, 50.0, 75.0 and 100.0 mg/kg. Three monoterpenes, p-cymene, 1,8-cineole and cuminaldehyde displayed a durable larvicidal activity with LC50 values of 0.14, 1.59 and 1.90 mg/kg 3 days post treatment. The three monoterpenes were more toxic than deltamethrin (LC50 = 3.36 mg/kg). Likewise, monoterpenes induced a significant reduction in pupation and adult emergence. Cuminaldehyde at 25.0 mg/kg, and p-cymene, 1,8-cineole and citronellal at 50.0 mg/kg caused a complete inhibition of pupation and adult emergence. Also, p-cymene at 25.0 mg/kg reduced the activity of larval amylase and lipase, while 1,8-cineole and cuminaldehyde increased their activity. Cuminaldehyde and α-terpinene inhibited the activity of proteases whereas p-cymene enhanced their activity. In the case of acetylcholinesterase, general-esterase and adenosinetriphosphatase, p-cymene and 1,8-cineole induced enzyme inhibition and citronellal increased enzyme activities. Finally, the tested monoterpenes caused histological changes on treated larvae, such as the basement membrane appeared and the epithelium cells deformed in some points and seen filled with scattered vacuoles. These findings indicate that the tested monoterpenes have a potential to be applied in IPM programs of M. domestica.

First record of the genus Haritalodes Warren, 1890 and H. derogata (Fabricius, 1775) (Lepidoptera: Crambidae: Spilomelinae) from Türkiye and its morphological and molecular identification

The genus Haritalodes Warren, 1890 is represented by 12 species worldwide except in the Nearctic and Neotropical regions. Haritalodes derogata (Fabricius, 1775), commonly known as the cotton leaf roller moth, is the most widely distributed species of the genus and is common in the West Palaearctic Region. This species is one of the most serious pests of Malvaceae. The larvae primarily feed on the leaves, and severe population levels may lead to significant yield loss in the primary host, cotton. In a survey in 2023, the shrubs of the Hibiscus sp. were found to be infested by a group of larvae with a very dense population feeding on the leaves in Trabzon Province, Türkiye. The larvae were reared for pupation and adult emergence. Morphological identification according to male and female genitalia as well as sequencing of the mitochondrial cytochrome oxidase region I (COI) from larvae and adults revealed that the species is H. derogata. This is the first report of the genus Haritalodes and Haritalodes derogata in Türkiye.

What accounts for the difference in the emergence times of Drosophila melanogaster between the first and second eclosion days?

AbstractOne of the characteristics of the adult eclosion rhythm in Drosophila melanogaster is that adult emergence time differs greatly between the first and second eclosion days. The emergence time is in the middle of the light period on the first eclosion day, but immediately after light‐on on the second day. We hypothesized that incomplete entrainment of the endogenous pacemaker to the light–dark (LD) cycle is responsible for the daily variation. Due to the very short pupal period of this species, adult emergence may occur before complete synchronization of the pacemaker with the external cycle on the first eclosion day. Therefore, the peak time on the first eclosion day may differ significantly from that on the second day. To verify this hypothesis, using pupae that had pupariated within 24 h, the time difference between the first and second peaks was compared in LD 12:12 or constant darkness at five different temperatures from 30 to 15°C. In both light regimes, the time difference decreased with decreasing temperature and extended pupal duration. The interval between the eclosion peaks approached 24 h, supporting this hypothesis. These results can be interpreted by using a two‐oscillator model.