Parental Provisioning Research Articles

The Effectiveness of a Novel Public Health Campaign to Reduce Parental Provision of Alcohol

Abstract Background Parental provision of alcohol to children is common despite being associated with negative outcomes, including earlier initiation of alcohol use and riskier drinking behaviours. Parental provision can be particularly problematic because it suggests to children that their parents have permissive attitudes to underage alcohol use. This study evaluated the ‘I need you to say no’ mass media public health campaign implemented by the Mental Health Commission in Western Australia (Nov 2018 - Feb 2022). The campaign adopted a novel approach by depicting adolescent children asking their parents to say ‘no’ if they ask for alcohol, alongside information challenging beliefs that provision behaviours are safe and commonplace. Methods Parents in Western Australia (n = 297) were surveyed in March 2022 to examine campaign recognition, perceptions of the campaign, and behaviours enacted due to seeing the campaign. Descriptive analyses were conducted. Two generalised linear models were also run to identify variables associated with positive campaign perceptions and behaviours enacted due to the campaign. Results The campaign was recognised by 4 in 5 parents and was rated by 70+% as being clear, memorable, and believable. Two-thirds of parents reported that the campaign made them concerned about underage drinking and less likely to supply alcohol to minors. Half the sample reported talking to their children about alcohol as a result of seeing the campaign. Perceptions of the campaign did not differ according to demographic characteristics, suggesting the campaign achieved widespread approval across demographic subgroups. Positive perceptions of the campaign were associated with enacting more of the examined harm reduction behaviours (B = .43, p = .002). Conclusions A novel campaign discouraging parental provision of alcohol resonated with parents and motivated harm reduction behaviours. Such campaigns have the potential to reduce alcohol-related harms among underage people. Key messages • A campaign advising parents to not provide alcohol to children was well received. • Such campaigns can challenge permissive attitudes to parental alcohol provision and promote harm-reduction behaviours.

Nestling growth rate and food consumption increases under experimentally prolonged daylength in a New World sparrow

When evaluating avian reproduction, life history theory examines the trade‐offs between parental effort, the number and size of offspring, and the rate of nestling development. The growth rates and body sizes of developing birds vary geographically and can diverge with both latitude and migratory strategy. In terms of offspring size, growth rate can deviate in nestlings of the same or similar species due to the correlated influences of weather events, predation pressure, food availability, number of nestmates and parental provisioning. Furthermore, a longer photoperiod for species nesting at higher latitudes increases the duration over which a nestling can be fed each day, and increased nestling provisioning has been positively correlated with growth rate. Whether the amount of time a bird is fed during development drives this variation in growth rate and morphology is unknown. By removing supplemental environmental stressors (e.g. weather, predation) and standardizing feeding rate and environment, we explored the influence of daily duration of nestling provisioning on dark‐eyed junco Junco hyemalis nestlings. We hand‐reared 65 chicks of a sedentary junco subspecies J. h. carolinensis under both their natural photoperiod and the longer photoperiod of a closely related migratory subspecies J. h. hyemalis and compared growth rate, mass, morphology and the amount of food consumed. Average growth rate, fasted mass, wing length and total daily food consumption were all greater in birds hand‐reared under the longer, more northern photoperiod treatment. These findings suggest that increased daily photoperiod at higher latitudes may allow for greater total food provisioning and thus may play a role in the ability of parents in compressed breeding seasons to produce high quality offspring. This points to a trade‐off between provisioning effort and nestling growth rate in lower latitude (shorter photoperiod) populations and points to an important role of developmental plasticity on growth rate and morphology.

Snacking practices from infancy to adolescence: parental perspectives from longitudinal lived experience research in England.

Consumption of snacks and ultra-processed foods (UPF) high in fat, salt and sugar (HFSS) is associated with rising rates of obesity and growing socioeconomic disparities in nutrition. While infancy, childhood and adolescence are critical periods for development of dietary preferences, there remains a dearth of research exploring factors that underpin snacking behaviour over this time. This review aims to address this gap by drawing from qualitative lived experience research, with 122 families of different socioeconomic position (SEP), to explore how the (i) home food environment, (ii) food environment and (iii) social value and meanings of food shape parental provision of snacks. This review shows that snacking holds important meanings in everyday family life, with infants integrated into existing snacking practices from an early age. Price promotions, low-cost and long shelf-lives all make UPF and HFSS snacks an appealing option for many low-SEP parents; while children's requests and preferences for HFSS snacks present a challenge across SEP. However, higher-SEP parents can ensure fresh fruits are always available as an alternative snack, while fruit is described as a financially risky expenditure for low-SEP families. The present findings also indicate that retailers and producers are increasingly promoting 'healthier' snacks through product packaging and marketing, such as 'meets one of your five a day', despite these products displaying similar nutritional profiles to traditional UPF and HFSS snacks. We outline a series of policy recommendations, including extending Healthy Start Vouchers and the Fruit and Vegetable Scheme in schools and action to address misleading product marketing and packaging.

“They won't push me away”: Transgender and gender‐expansive youth of color's perceptions of parental gender‐identity‐specific support

AbstractObjectiveThis study aims to identify types of gender‐identity‐specific social support provided by parents that helps transgender and gender‐expansive (TGE) youth of color thrive.BackgroundTGE youth of color benefit from parental social support, though less is known about supportive practices that specifically affirm marginalized gender identities—gender‐identity‐specific social support. Guided by a counter‐storytelling framework that highlights the voices of TGE youth of color, this study investigates how TGE youth of color perceive such support from parents.MethodData were collected via semistructured interviews with 18 youth (14–25 years, Mage = 20.28) who identified as TGE and as persons of color. Transcripts were analyzed using a modified thematic coding approach to identify themes related to youth perceptions of parental support of their gender identities.ResultsFindings revealed four major themes related to parental provision of gender‐identity‐specific social support: self‐work, support of gender‐atypical behavior during early development, current affirmational and instrumental support, and family cohesion. Participants discussed parental gender‐identity‐specific support as a valued source of strength.ConclusionTGE youth well‐being can be enhanced by facilitating parents' provision of gender‐identity‐specific social support.ImplicationsSpecific insight into sources of resilience and strength for TGE youth of color are offered for researchers and practitioners.

A service evaluation of the impact of parental information provision on analgesia administration at home posttonsillectomy.

Tonsillectomy and adenotonsillectomy are together the most common pediatric surgical procedure and are increasingly performed as day cases. Postoperative pain is commonly severe for 1-2 weeks, but parental analgesia concerns lead to poor analgesia prescription compliance and under administration. This service evaluation assessed parental compliance with analgesia, elicited parental concerns, and obtained parental suggestions for improving the current written advice. Telephone questionnaires were completed on postoperative Days 3/4 and 7 with 42 parents of pediatric (adeno)-tonsillectomy patients over a 6-month period, peri-pandemic. The questionnaire collected categorical data on: analgesia prescribed and administered, the child's symptoms, and healthcare resource use. Qualitative data on barriers to analgesia administration and suggestions for written advice improvement were grouped thematically. Sore throats were reported by 93.3% parents between discharge and Day 3/4 but only 43.3% parents had 100% compliance with regular paracetamol and ibuprofen in the same time period. Parents frequently avoided morphine administration, expressing concerns about side effects, addiction, and previous experience. Parents were also concerned about using ibuprofen, discrepancies between weight-based and bottle instruction doses, and the length of the analgesia course. Parents would like further written information and reassurance on these topics as well as guidance on tapering or stopping analgesics and whether to wake their child at night. The breadth of unmet information needs identified in this service evaluation, alongside parental suggestions, will be used to improve the current written advice with the aim to improve the postoperative pain experience at home. These include information on length of analgesic course, safety of ibuprofen and paracetamol coadministration for analgesia, and details about morphine administration, including safety, side effects, and indication.

Trends in and factors associated with parental provision of alcohol to minors in Western Australia, 2013-2019.

Some parents provide alcohol to their underage children, despite a range of negative outcomes being associated with this practice. The present study aimed to assess factors associated with and changes in parental provision behaviours from 2013 to 2019 in Western Australia. Annual cross-sectional online surveys were conducted (total n = 2635). Assessed variables included parents' demographic characteristics, alcohol use, awareness of the relevant Australian alcohol guideline, attitudes to parental provision of alcohol and provision behaviours. A binary logistic generalised linear model was used to identify factors associated with parental provision of alcohol. Parental provision of alcohol prevalence decreased from 40% in 2013 to 27% in 2019. The following variables were significantly associated with parental provision: permissive attitudes to provision (β = 2.82); older parental age (β = 1.28); a lack of knowledge of the relevant guideline (β = 0.78); survey year (β = 0.083); and greater alcohol use (β = 1.12). Socioeconomic position was not associated with parental provision. Female parents were more likely to report that an adult in the household provided children with alcohol (β = 1.3) DISCUSSION AND CONCLUSIONS: The findings suggest that (i) although still commonplace, parental provision of alcohol to minors in Western Australia has declined over time; and (ii) the effectiveness of campaigns aiming to reduce this behaviour may be enhanced by targeting households with parents who are older and heavier drinkers and by including content that challenges permissive views on alcohol provision to minors.

Extended parental provisioning and variation in vertebrate brain sizes.

Large brains provide adaptive cognitive benefits but require unusually high, near-constant energy inputs and become fully functional well after their growth is completed. Consequently, young of most larger-brained endotherms should not be able to independently support the growth and development of their own brains. This paradox is solved if the evolution of extended parental provisioning facilitated brain size evolution. Comparative studies indeed show that extended parental provisioning coevolved with brain size and that it may improve immature survival. The major role of extended parental provisioning supports the idea that the ability to sustain the costs of brains limited brain size evolution.

Parental food provisioning and nestling growth under Philornis downsi parasitism in the Galapagos Green Warbler-Finch, classified as ‘vulnerable’ by the IUCN

In the Galapagos Islands, many endemic landbird populations are declining due to habitat degradation, food availability, introduced species and other factors. Given nestlings typically lack efficient defense mechanisms against parasites, hematophagous ectoparasites such as the larvae of the introduced Avian Vampire Fly, Philornis downsi, can impose high brood mortality and cause threatening population declines in Darwin finches and other landbirds. Here, we assess whether the food compensation hypothesis (i.e., the parents’ potential to compensate for deleterious parasite effects via increased food provisioning) applies to the Green Warbler-Finch. We differentiated nests with low or high infestation levels by P. downsi and quantified food provisioning rates of male and female parents, time females spent brooding nestlings, and nestling growth. Male provisioning rates, total provisioning rates and female brooding time did not significantly vary in relation to infestation levels, nor by the number of nestlings. Opposed to the predictions of the food compensation hypothesis, females showed significantly reduced provisioning rates at high infestation levels. Nestling body mass was significantly lower and there was a reduction of skeletal growth, although not significantly, in highly infested nests. The females’ response to high infestation may be due to parasites directly attacking and weakening brooding females, or else that females actively reduce current reproductive effort in favor of future reproduction. This life-history trade-off may be typical for Darwin finches and many tropical birds with long lifespans and therefore high residual reproductive value. Conservation strategies may not build on the potential for parental food compensation by this species.

Can motivation and intentions of parental support predict musical achievement before the commencement of musical studies at the elementary school level?

Admission procedures to elementary school in Music Conservatoires in Portugal consist in the assessment of aural aptitude. This investigation aims at assessing the power of aural aptitude at predicting future musical achievement as well as the assessment of two other variables for the same purpose: motivation and intentions of parental support. For that matter, our sample includes the cohort of the admitted candidates and their parents to the 2019 to 2020 academic year. We used a longitudinal approach that followed the musical achievement of the sample during the 2019 to 2020 and 2020 to 2021 academic years. Questionnaires were administered to both children and parents to collect information on motivation to learn a musical instrument and anticipation of parental support provision. Our results point that, after 2 years of music education, neither of the tested variables were able to predict the students’ musical achievement. These results suggest that the model of admission procedures to Music Conservatoires based on aural aptitude must be rethought and that this line of investigation could be revisited later when our sample enters middle school to assess again the predicting power of motivation and parental support.

Parental provisioning drives brain size in birds

Large brains support numerous cognitive adaptations and therefore may appear to be highly beneficial. Nonetheless, the high energetic costs of brain tissue may have prevented the evolution of large brains in many species. This problem may also have a developmental dimension: juveniles, with their immature and therefore poorly performing brains, would face a major energetic hurdle if they were to pay for the construction of their own brain, especially in larger-brained species. Here, we explore the possible role of parental provisioning for the development and evolution of adult brain size in birds. A comparative analysis of 1,176 bird species shows that various measures of parental provisioning (precocial vs. altricial state at hatching, relative egg mass, time spent provisioning the young) strongly predict relative brain size across species. The parental provisioning hypothesis also provides an explanation for the well-documented but so far unexplained pattern that altricial birds have larger brains than precocial ones. We therefore conclude that the evolution of parental provisioning allowed species to overcome the seemingly insurmountable energetic constraint on growing large brains, which in turn enabled bird species to increase survival and population stability. Because including adult eco- and socio-cognitive predictors only marginally improved the explanatory value of our models, these findings also suggest that the traditionally assessed cognitive abilities largely support successful parental provisioning. Our results therefore indicate that the cognitive adaptations underlying successful parental provisioning also provide the behavioral flexibility facilitating reproductive success and survival.

Selecting the best: Interspecific and age-related diet differences among sympatric steppe passerines

Parental food provisioning is crucial for the growth and survival of offspring. Growth rate depends on food quality and food supplied to offspring may differ from what adults use for their own. In the case of steppe passerine birds, detailed characterization on nestling dietary composition, as well as prey choice and resource partitioning among species, is a pending subject. Dietary differences between nestlings and adults remain also largely unexplored. By using faecal DNA metabarcoding, we described the diet of nestlings and adults of five shrub-steppe passerine species over the 2017–2019 breeding seasons in central Spain. We also monitored arthropod availability in the field to assess dietary selection. We expected interspecific dietary differences to limit competition for food resources among sympatric species, as well as parental selection of high quality prey for nestlings. We also predicted age-related differences, with nestlings being fed nutrient-rich prey more frequently than adults. The main arthropod orders provisioned to nestlings were Orthoptera, Julida, Araneae and Lepidoptera. Nestlings of the different species showed high interspecific diet overlap, indicating both a coincidence in growth needs among bird species and no or little limitation of the most profitable resources during the breeding season. Adults of all species showed higher diet richness than nestlings, and age-related differences in prey composition were mainly driven by the selection of the most easily digestible, larger protein- and calcium-rich prey for nestlings, which may favour their rapid growth, and avoiding highly sclerotized and less nutritional prey such as ants. Our study sheds light on the basic ecology and conservation of these declining steppe birds, indicating that interspecific competition may not be a major factor during the breeding season. Given the current global decline of arthropods, further long-term research would be necessary, along with the implementation of effective conservation measures that ensure a sufficient availability of resources identified as key prey in the diet of steppe bird nestlings.

The Association Between Self-Esteem and Smartphone Dependency Among Children: A Moderated Mediation Model of Social Withdrawal and Parental Provision of Structure

Objectives: This study examined the extent to which children’s self-esteem influenced their smartphone dependency through social withdrawal and whether this mediating path would vary depending on parents’ provision of structure.Methods: This study included data on 2,394 fourth-grade elementary school children(boys, <i>n</i> = 1191; <i>M</i> = 10 years old, <i>SD</i> = .09), taken from the 2018 Korean Children and Youth Panel Survey conducted by the National Youth Policy Institute. Descriptive statistical analysis and correlation analysis were conducted using SPSS 26.0. In addition, the Process Macro No. 8 model was used to examine the moderated mediating effects of social withdrawal and parental provision of structure.Results: It was found that children’s self-esteem significantly and directly influenced their smartphone dependency, and indirectly influenced smartphone dependency through social withdrawal. Parents' provision of structure significantly moderated the association between children's self-esteem and social withdrawal, and the association between children’s self-esteem and smartphone dependency. Parents’ provision of structure also moderated the mediating effect of social withdrawal in the path between children’s self-esteem and smartphone dependency. This suggests that a high level of parental structure strengthens the beneficial effects of children’s self-esteem on smartphone dependency through reduced social withdrawal.Conclusion: This study examined how children’s individual characteristics and parenting behavior interact to influence children’s smartphone dependency. The findings highlight the importance of developing and implementing parent programs to support positive parenting practices and promote children’s healthy adjustment.

Interspecific differences in plasma carotenoid profiles in nestlings of three sympatric vulture species.

Carotenoids are diet-based micronutrients important in health and coloration signaling. Related species with similar diets can differ in the kinds and levels of circulating carotenoids, which suggests specific physiological mechanisms to efficiently utilize these micronutrients, regardless of their availability. We explored whether diet and parental provisioning of unusual sources of carotenoids (fresh vegetal matter and vertebrate feces) can explain the occurrence and concentrations of carotenoids in the cinereous vulture Aegypius monachus, griffon vulture Gyps fulvus, and Egyptian vulture Neophron percnopterus nestlings, even when these pigments appear to not be deposited in their integumentary system. A greater diversity of wild prey in diet could be behind the profile of higher concentrations of carotenoids in the Egyptian vulture, the species with carotenoid-dependent coloration during adulthood, while differences in diet composition between cinereous and griffon vultures do not translate to different carotenoid profiles. The carotenoid profile appears to not be related to the ingestion of unusual matter rich in these compounds, although the infrequent occurrence of lycopene and unidentified γ-carotene-like compounds suggest that these vultures may be exploiting vegetal matter that left no identifiable unconsumed remains in the nest of Egyptian vultures. The consumption of green plant material by griffon vultures does not result in especially high levels of carotenoids when compared to the carotenoids found in cinereous vultures, which do not consume green plant material. Ungulate feces were not provisioned to Egyptian vulture nestlings, despite the fact they contain carotenoids that adults need for appropriate coloration. Overall, this study indicates that diet differences alone appear insufficient to explain contrasting interspecific carotenoid profiles, especially since all types of food consumed are considered to be poor in carotenoids, except vegetable matter. We suggest that nestling Egyptian vultures are comparatively efficient in uptaking carotenoids present in low concentrations in food when these compounds are not deposited in their integument, which suggests allocation to other functions.

Insulin-like growth factor 1 and the hormonal mediation of sibling rivalry

In altricial animals, young are completely dependent on parents for provisioning. The ability to outcompete siblings to receive parental provisioning has clear fitness benefits, and may be mediated by hormones that influence growth. We analyzed the effects of insulin-like growth factor 1 (IGF-1) on body size, growth, and sibling rivalry in eastern bluebirds (Sialia sialis). To determine whether IGF-1 is upregulated in response to the competitive environment, we manipulated brood sizes and examined the effect on IGF-1 levels, nestling body size, growth rate, and behavior. In a separate experiment, we injected nestlings with exogenous IGF-1 to study its impacts on body size, growth rate, and sibling competition. Brood size manipulation did not influence endogenous IGF-1 levels, but male nestlings with higher IGF-1 levels early in the nestling period tended to have greater mass gain than males with lower IGF-1 levels. Nestlings with higher IGF-1 levels also tended to be fed more frequently by parents. In the injection experiment, IGF-1 injected individuals tended to be heavier than vehicle injected young by the end of the nestling period, which suggests that IGF-1 can influence mass gain in bluebirds. IGF-1 has been proposed to be a mediator of life-history strategies and post-hatching behavior. Our results suggest that although bluebird nestlings do not adaptively elevate IGF-1 in response to the presence or number of siblings, IGF-1 may influence growth during the nestling period. These findings shed light on sibling competition, life history strategies, and the hormones that underlie them.

Parent Coaching in Natural Communication Opportunities Through Bug-in-Ear Technology

We examined whether there was a functional relation between BIE eCoaching with parents of young children with language disorders and parent provision of natural communication opportunities and whether parents maintained their provision of natural communication opportunities when the intervention was faded. Data also were collected to assess the social validity of the intervention. The results indicate that BIE eCoaching with parents of young children with language disorders was effective in increasing parent provision of natural communication opportunities. Parents maintained their provision of natural language opportunities above baseline levels after intervention was withdrawn. All participants strongly agreed that BIE eCoaching was helpful for changing their communication practices with their child and would recommend it to other parents of children with language disorders.

Parental Involvement and Pupils’ Academic Performance in English Language

This cross sectional survey investigated the extent to which parental provision of required text and work books, expression of concern towards academic work, support with homework and level of literacy influenced pupil’s academic performance in English language in Tubah Sub-Division, North-West Region of Cameroon. The target population of this study consisted of the 631 class six pupils and their respective parents in the 20 state-approved primary schools within Bambili and Bambui in Tubah Sub-Division. Data were obtained from a sample of 80 parents of pupils of four primary schools obtained through purposive and simple random sampling techniques. The pupils’ scores in English language were used to compare with respective parental responses. The Chi Square test (χ2) was used to verify the hypotheses given that data were non parametric. The findings showed that a significant relationship exists between parental involvement and pupils’ academic performance in English language. It showed that the more parents provided the required text books (χ2=6.401; P=0.011), assist their children directly or indirectly in the completion of their homework (χ2 test P<0.001) and express concern towards their academic progress (493.84, P<0.001), the higher their academic performance. It was also found that illiteracy is not a limitation to parental involvement in pupils’ academic work (χ2=0.001; P=0.970). Significant recommendations were made from the findings. Parents should be proactive towards their pupils’ academic work, provide recommended text and workbooks, verify their books constantly, offer assistance in the completion of homework, attend parent-teacher association meetings and maintain contact with school to monitor pupils’ progress. Teachers and school authorities should encourage parents to set attainable standards for their children, reinforce their commendable achievements, encourage the use of English language at home, and regulate and monitor study time at home. The findings are meaningful within the theories of Lev Vygotsky (1978), Gonzalez-Pienda et al. (2002), Fan and Chen (2001) and Van Voorhis (2003).

Parental environment modulates offspring thermal tolerance in a foundational intertidal seaweed

Thermotolerance acquisition is an important ecophysiological trait under global warming scenarios because it can allow organisms and populations to adapt, particularly during the most sensitive early stages of a life cycle. Here we used seasonality as a natural scenario to explore whether parental thermal histories can modulate thermotolerance of recruits of a canopy-forming intertidal seaweed (Fucus guiryi) across an ecologically relevant thermal gradient (15–28°C). For this purpose, we harvested embryos from parents after the periods of maximum and minimum accumulated heat exposure (late summer and late winter), and at the onset of summer. During early ontogeny we followed initial embryo size, internal nutrient content, survival, growth and developmental stages as performance metrics to address whether parental acclimation modulates thermal tolerance via provisioning or parental effects. Late winter recruits of F. guiryi exhibited the greatest thermotolerance, showing a broader range of optimal temperatures and higher upper thermal limits for growth and survival, probably associated with better provisioning from parental thalli. Physiological fitness of recruits decreased above 25°C, showing arrested growth, impaired development and dropping survival rates, but functional loss was more abrupt in early summer. Late summer responses confirmed that heat hardening occurs in natural populations, but at the seasonal scale the adaptive significance of this increased thermotolerance is much lower than that induced by winter parental provisioning. Heat-induced thermotolerance occurred from early to late summer due to parental exposure to warming. However, winter provisioning promoted greater thermotolerance acquisition. Exposure to moderate thermal stress at the onset of summer without prior seasonal acclimation resulted in minimum levels of thermal tolerance and loss of offspring fitness. While warmer winters might be neutral or benefit early development, increasing temperatures and poor nutritional conditions at the onset of the summer season may reduce survival and hamper population recruitment.

Conspecific Density as a Driver of Offspring Body Condition in Three Cormorant Colonies in Denmark

Density-dependent depletion of prey during the breeding season may affect breeding performance and colony development in seabirds and colonial waterbirds. Breeding Great Cormorants Phalacrocorax carbo sinensis are central place foragers, so parental flight distances to profitable foraging grounds and thus parental provisioning of offspring are likely affected by local food availability. Chick body condition in a given colony may therefore be influenced by the distance to feeding areas, changes in fish stocks and fish distribution as well as the number of Cormorants from neighbouring colonies using the same feeding areas. At three Danish Great Cormorant colonies with overlapping foraging ranges and variable access to shallow marine areas, Vorsø (VO), Mågeøerne (MA) and Stavns Fjord (SF), we investigated variation in mean chick body condition (n = 9697) in relation to colony location, year, colony size and estimated density of foraging conspecifics during 1993–2007. Foraging areas available to VO colony parents had the highest theoretical densities of conspecifics and the VO chicks were invariably in poorer condition than the chicks at the other two colonies. Chick body condition was negatively correlated with estimated foraging density, especially within a foraging range of 20 km. Body condition between all three colonies was weakly correlated over the years, suggesting that changes in macro-environmental conditions (e.g. fish density) only had moderate impacts on food availability, independently of Cormorant numbers. We conclude that both the geographical location of colonies, the size of the colony itself and the nearest neighbouring colonies and the associated variation in density of foraging Cormorants were major drivers of variation in chick body condition between colonies and years.

Clonal Parental Effects on Offspring Growth of Different Vegetative Generations in the Aquatic Plant Pistia stratiotes.

Parental (environmental) effects can modify the growth of offspring, which may play an essential role in their adaptation to environmental variation. While numerous studies have tested parental effects on offspring growth, most have considered offspring growth of only one generation and very few have considered offspring growth of different generations. We conducted a greenhouse experiment with an aquatic clonal plant Pistia stratiotes. We grew a single ramet of P. stratiotes under low or high nutrients, the initial (parent) ramets produced three different generations of offspring ramets, and these offspring ramets were also subjected to the same two nutrient levels. High nutrients currently experienced by the offspring increased biomass accumulation and ramet number of all three offspring generations of P. stratiotes. However, these positive effects on biomass were greater when the offspring ramets originated from the parent ramets grown under low nutrients than when they were produced by the parent ramets grown under high nutrients. These results suggest that parental effects can impact the performance of different offspring generations of clonal plants. However, heavier offspring ramets produced under high nutrients in parental conditions did not increase the subsequent growth of the offspring generations. This finding indicates that parental provisioning in favorable conditions may not always increase offspring growth, partly depending on root allocation but not ramet size such as ramet biomass.

Understanding the academic achievement of the first- and second-generation immigrant students: a multi-level analysis of PISA 2018 data

The present study explores the antecedents of first- and second-generation (1G and 2G) immigrant students’ academic performance using PISA 2018 data. The study draws on an international sample of 11,582 students from 534 schools in 20 countries and focuses on PISA schools that catered to a mix of 1G and 2G students. The study explores the role that student attributes, student-perceived peer and parental support, school provisions, and school equity-oriented policies have on immigrant student academic achievement. The analysis involved specifying three separate stepwise multi-level regression models for mathematics, science, and reading achievement. Findings suggested that, at the within-school level, perceived parental support and teacher enthusiasm and the adaption of instruction were associated with improved academic performance, while student experience of bullying was associated with more substantive negative academic outcomes. At the between-school level, the opportunity to participate in creative extracurricular activities was associated with improved academic performance. In contrast, a higher proportion of 1G students and the overall perceived level of bullying of immigrant students were associated with substantively negative academic outcomes between schools. Tests of moderation effects suggested that parental emotional support appeared to be of particular relevance to 1G students’ math and reading outcomes, while enhanced SES status appeared to be specifically relevant to improved science and reading outcomes for 1G students. Implications for policy and practice are discussed.