Quantifying insect emergence in tidal freshwaters and the importance of aquatic prey in wetland-dependent songbird diet

Insectivorous birds and their arthropod prey are experiencing widespread population declines, driven largely by anthropogenic disturbance and climate change. For wetland-dependent insectivores that consume a mixture of terrestrial and aquatic insects, understanding the availability, consumption, and nutritional qualities of aquatic diet subsidies is important for conservation. I use prothonotary warblers (Protonotaria citrea) as a model species throughout this work, because their breeding season aligns with aquatic insect emergence and they include aquatic insects when provisioning nestlings. In the first chapter, I estimate aquatic insect emergence from tidal freshwaters, which are understudied compared to nontidal systems. Using continuous field sampling with emergence traps, I found that aquatic insect biomass emerging from tidal freshwater habitats along the James River Estuary are among the highest published to date. These emergence estimates help to assess the overlap of pulsed aquatic resources with critical life history periods of riparian consumers. In the second chapter, I quantify prothonotary warbler nestling diet across two years and nine populations throughout their breeding range. Using DNA metabarcoding, I found that nestlings in all populations were provisioned with emergent aquatic insects and aquatic mollusks. However, aquatic diet components in each population differed taxonomically and throughout the breeding season. Diet determinations confirm widespread consumption of aquatic prey, but do not speak to how nestlings are impacted by presence or absence of aquatic diet items during development. In the third chapter, I analyze the variation in nestling condition for the James River Estuary populations with estimated aquatic insect emergence and quantified diets. Using a combination of mass-based and physiological indicators for condition, I found that early-season nestlings tended to be heavier than average, with greater circulating concentrations of essential polyunsaturated fatty acids and lower concentrations of pro-inflammatory lipid metabolites. Better nestling condition at times when nestlings are provisioned with more aquatic prey provides evidence that aquatic prey subsidies are important for developing nestlings

Breastfeeding duration and its relation to weight gain, eating behaviours and positive maternal feeding practices in infancy

Research examining the relationship between breastfeeding and infant weight has generated conflicting results. Few studies account for significant covariates and many suffer methodological problems such as retrospective self-report. The current study aimed to investigate relationships between breastfeeding duration, infant weight and eating and positive maternal mealtime behaviours, whilst overcoming many of the limitations of previous research. Eighty-one women on low-risk maternity units gave informed consent and were visited at home at 1-week, 1-, 6- and 12-months postpartum. Infants included 45 males and 36 females (mean birth-weight 3.52 kg [SD 0.39]). Mothers and infants were weighed and measured and feeding information was recorded at each visit. Infant weight was converted to a standard deviation score (SDS), accounting for age and sex. Mothers reported infant eating behaviours at 12-months using the Children's Eating Behaviour Questionnaire and were observed feeding their infants solid food at home at 6- and 12-months. Partial correlations (covariates: maternal age, education, BMI, smoking during pregnancy, household income, infant birth weight SDS and age introduced to solid foods) revealed negative associations between breastfeeding duration and 1- to 6- and 1- to 12-month weight gain, and 6- and 12-month weight. Breastfeeding duration was also associated with a slower rate of infant eating and greater observed maternal vocalisations, appropriateness and sensitivity. Results support a dose-response relationship between breastfeeding and infant weight and suggest that breastfeeding may encourage the development of obesity-protective eating behaviours through learning to attend to internal hunger and satiety signals. Future research should investigate whether relationships between slowness in eating and weight extend to satiety responsiveness after infancy

Infant temperament, maternal feeding behaviours and the timing of solid food introduction:The contribution of infant temperament and maternal feeding behaviours

Despite guidance from the World Health Organization and the U.K. Department of Health, many mothers introduce solid food before their infant is 6 months old. The current study aimed to investigate relationships between maternal feeding behaviours (preintroduction and postintroduction to solids), infant temperament, and the timing of introduction to solid food. Eighty-one women were recruited on low-risk maternity units and were contacted at 1 week, 3, and 6 months postpartum. Mothers of infants (45 males, 36 females, mean birth weight 3.52 kg [SD 0.39]) completed the behaviours component of the Infant Feeding Style Questionnaire via telephone interview at 3 months. At 6 months, they were observed feeding their infant solid food at home and reported infant temperament using the Infant Behaviour Questionnaire-Revised (short form). Partial correlations (covariates: birth weight, maternal age, breastfeeding duration, and postnatal depression) revealed negative associations between age of introduction to solid food and temperament (smiling and laughter) and laissez-faire milk feeding behaviours; and positive associations between age of introduction to solid food and restrictive milk feeding behaviours and verbal involvement during an observed mealtime. Hierarchical multiple regression analysis revealed that an infant's birth weight and the degree to which their mothers perceive them to smile and laugh are key predictors of when they will be introduced to solid food, over and above other variables of interest (e.g., maternal milk feeding behaviours, breastfeeding duration, and postnatal depression)

The role of sensory sensitivity in predicting food selectivity and food preferences in children with Tourette syndrome

Tourette syndrome (TS) is a neurodevelopmental disorder characterised by involuntary, repetitive and non-rhythmic motor and vocal tics. Despite suggestion that diet may affect tics, and the substantial research into children's diet, eating behaviours and sensory processing in comorbid disorders (e.g. ASD), research in TS is lacking. The present study examined differences between children with and without TS in parental reports of child selective eating, food preferences and sensitivity, and aimed to examine sensory sensitivity as a predictor of food selectivity outcomes in children with and without TS. Thirty caregivers of children with TS (M = 10 years 8 months [SD = 2.40]) and the caregivers of 30 age- and sex-matched typically developing (TD) children (M = 9 years 9 months [SD = 2.50]) completed the following measures online: Short Sensory Profile, Food Preference Questionnaire for Children, Child Eating Behaviour Questionnaire. Children with TS were reported to have significantly higher levels of food selectivity and sensory sensitivity, and less preference for fruit and vegetables than TD children. Importantly, while higher levels of overall sensory sensitivity predicted eating outcomes in the TS group, only sensitivity to taste/smell was found to be a predictor of food selectivity and preference for vegetables for both groups of children. The findings suggest that efforts to address food selectivity in children with TS may be enhanced by including strategies that address atypical sensory processing

Understanding the impact of diet and nutrition on symptoms of Tourette Syndrome: A Scoping Review

This document is the accepted manuscript version. The final, definitive version of this paper has been published in Journal of Child Health Care, December 2017, published by SAGE Publishing, doi:https://doi.org/10.1177/1367493517748373.Anecdotal reports frequently suggest some dietary involvement in the maintenance of tics in children with Tourette syndrome (TS). This scoping review aimed to (1) understand the possible influence of diet as a trigger of tics and (2) map out the existing studies documenting dietary interventions in children with TS. Current evidence suggests no single diet to benefit individuals with TS. However, reports from parents of children with TS suggest that certain allergens in food may exacerbate tic-related symptoms. For example, an increase in tics has been related to the consumption of caffeine and refined sugar. Moreover, oligoantigenic diets and sugar-free diets have been identified as significantly reducing tics. More research is urgently needed to develop more accurate guidance for parents and children with TS, as many have reported using dietary and nutritional supplements, despite the lack of evidence detailing any benefits, side effects and recommended doses.Peer reviewedFinal Accepted Versio

The relationship between sensory sensitivity, food fussiness and food preferences in children with neurodevelopmental disorders

Heightened sensitivity to sensory information has been associated with food fussiness in both atypical and typical development. Despite food fussiness and sensory dysfunction being reported as common concerns for children with neurodevelopmental disorders, the relationship that exists between them, and whether they differ between disorders, has yet to be established. The current study aimed to examine sensory sensitivity as a predictor of food fussiness in three different neurodevelopmental disorders, whilst controlling for comorbidity amongst these disorders. Ninety-eight caregivers of children with Attention Deficit Hyperactivity Disorder (ADHD; n = 17), Tourette Syndrome (TS; n = 27), Autism Spectrum Disorder (ASD; n = 27), and typical development (TD; n = 27) were compared using parental reports of child food fussiness, food preferences and sensory sensitivity. Children with neurodevelopmental disorders were reported to have significantly higher levels of both food fussiness and sensory sensitivity, with children with ASD and TS also showing significantly less preference for fruit than children with TD. Importantly, higher levels of taste/smell sensitivity predicted food fussiness for all four groups of children. In addition, taste/smell sensitivity fully mediated the differences in food fussiness between each group of neurodevelopmental disorders compared to the TD group. The findings highlight that food fussiness is similar across these neurodevelopmental disorders despite accounting for comorbidity, and that greater sensitivity to taste/smell may explain why children with neurodevelopmental disorders are more likely to be fussy eaters

Building, scaling, and sustaining a learning health system for surgical quality improvement: A toolkit

This article describes how to start, replicate, scale, and sustain a learning health system for quality improvement, based on the experience of the Michigan Surgical Quality Collaborative (MSQC). The key components to operationalize a successful collaborative improvement infrastructure and the features of a learning health system are explained. This information is designed to guide others who desire to implement quality improvement interventions across a regional network of hospitals using a collaborative approach. A toolkit is provided (under Supporting Information) with practical information for implementation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/156156/3/lrh210215.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/156156/2/lrh210215-sup-0001-supinfo.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/156156/1/lrh210215_am.pd

The menopause alters aerobic adaptations to high-intensity interval training

Introduction: Post-menopausal women have lower resting cardiac function than pre- menopausal women, but whether the menopause influences maximal cardiac output and hence exercise capacity is unclear. It is possible that pre- and post-menopausal women ̇ achieve similar improvements in peak aerobic capacity (V O2peak) and cardiac output with exercise training via different regional left ventricular muscle function (“LV mechanics”), as suggested by in vitro and animal studies. The aim of this study was to investigate the effects of the menopause on LV mechanics and adaptations to exercise training. Methods: Twenty-five healthy untrained middle-aged women (age 45–58 years; 11 pre-menopausal, 14 post-menopausal) completed 12 weeks of exercise training. Before and after exercise ̇ assessed using echocardiography at rest and during two submaximal physiological tests — lower body negative pressure (LBNP) and supine cycling. Results: The increase ̇ training, (i) V O2peak and blood volume were determined, and (ii) LV mechanics were in relative V O2peak after exercise training was 9% smaller in post-menopausal than pre- menopausal women, concomitant with a smaller increase in blood volume (P 0.05) despite altered regional LV muscle function, as indicated by higher basal mechanics in pre-menopausal women during the physiological tests after exercise training (P < 0.05). Conclusion: These findings are the first to confirm altered LV mechanics in post-menopausal women. In addition, the reduced aerobic adaptability to exercise training in post-menopausal women does not appear to be a central cardiac limitation, and may be due to altered blood volume distribution and lower peripheral adaptations

Thermally dynamic examination of local order in nanocrystalline hydroxyapatite

The main mineral component of bone is hydroxyapatite, a commonly nanocrystalline material which presents many challenges for those trying to characterize it. Here, local structure is analyzed using X-ray total scattering for synthetic samples, to enable a better understanding of the nanocrystalline nature of hydroxyapatite. Two samples were measured dynamically during heat treatment from 25°C to 800°C, and were analyzed using small box modelling. Analysis of sequential measurements when dwelling at key temperatures showed a significant relationship between time and temperature, indicating a process occurring more slowly than thermal expansion. This indicates a decrease in B-type CO32- substitution between 550°C and 575°C and an increase in A-type CO32- substitution above 750°C. A greater understanding of local, intermediate, and long-range order of this complex biomineral during heat treatment can be of interest in several sectors, such as in forensic, biomedical and clinical settings for the study of implant coatings and bone diseases including osteoporosis and osteoarthritis.Engineering and Physical Sciences Research Council (EPSRC): EP/T034238/1. This work was also partly supported by a Royal Society and Wolfson Foundation (RSWF/R1/180012). This work was carried out with the support of the Diamond Light Source, instrument I15-1 (proposal cy24283)

Isotopic composition of sinking particles: Oil effects, recovery and baselines in the Gulf of Mexico, 2010–2015

The extensive release of oil during the 2010 Deepwater Horizon spill in the northern Gulf of Mexico perturbed the pelagic ecosystem and associated sinking material. To gauge the recovery and post-spill baseline sources, we measured Δ14C, δ13C and δ34S of sinking particles near the spill site and at a reference site and natural seep site. Particulates were collected August 2010–April 2016 in sediment traps moored at sites with depths of 1160–1660 m. Near the spill site, changes in Δ14C indicated a 3-year recovery period, while δ34S indicated 1–2 years, which agreed with estimates of 1–2 years based on hydrocarbon composition. Under post-spill baseline conditions, carbon inputs to sinking particulates in the northern Gulf were dominated by surface marine production (80–85%) and riverine inputs (15–20%). Near the spill site, Δ14C values were depleted in October 2010 (–140 to –80‰), increasing systematically by 0.07 ± 0.02‰ day–1 until July 2013 when values reached –3.2 ± 31.0‰. This Δ14C baseline was similar to particulates at the reference site (3.8 ± 31.1‰). At both sites, δ13C values stayed constant throughout the study period (–21.9 ± 0.5‰ and –21.9 ± 0.9‰, respectively). δ34S near the spill site was depleted (7.4 ± 3.1‰) during October 2010–September 2011, but enriched (16.9 ± 2.0‰) and similar to the reference site (16.2 ± 3.1‰) during November 2012–April 2015. At the seep site, Δ14C values were –21.7 ± 45.7‰ except during August 2012–January 2013 when a significant Δ14C depletion of –109.0 ± 29.1‰ was observed. We interpret this depletion period, also observed in δ13C data, as caused by the incorporation of naturally seeped oil into sinking particles. Determination of post-spill baselines for these isotopic signatures allows for evaluation of anthropogenic inputs in future