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Purpose: We provide the first systematic review and meta-analysis of research examining multidimensional perfectionism-perfectionistic strivings and perfectionistic concerns-and orthorexia., Methods: The systematic review and meta-analysis was pre-registered and conducted using a search of PsycINFO, MEDLINE, Education Abstracts, and Oxford Academic, and ScienceDirect up to April 2023. PRISMA guidelines were also followed. Meta-analysis using random-effects models was used to derive independent and unique effects of perfectionism, as well as total unique effects (TUE), and relative weights. Moderation of effects were examined for age, gender, domain, perfectionism and orthorexia instruments, and methodological quality., Results: Eighteen studies, including 19 samples (n = 7064), met the eligibility criteria with 12 of these studies (with 13 samples; n = 4984) providing sufficient information for meta-analysis. Meta-analysis revealed that perfectionistic strivings (r +  = 0.27, 95% CI [0.21, 0.32]) and perfectionistic concerns (r +  = 0.25, 95% CI [0.18, 0.31]) had positive relationships with orthorexia. After controlling for the relationship between perfectionism dimensions, only perfectionistic strivings predicted orthorexia which also contributed marginally more to an overall positive total unique effect of perfectionism (TUE = 0.35; 95% CI [0.28, 0.42]). There was tentative evidence that orthorexia instrument moderated the perfectionistic concerns-orthorexia relationship., Discussion: Research has generally found that both dimensions of perfectionism are positively related to orthorexia. More high-quality research is needed to examine explanatory mechanisms while also gathering further evidence on differences in findings due to how orthorexia is measured, as well as other possible moderating factors., Level of Evidence: Level 1, systematic review and meta-analysis., (© 2024. The Author(s).)

Athlete burnout potentially has negative consequences for sport performance. However, to the best of our knowledge, empirical studies have yet to examine the relationship between athlete burnout and objective sport performance. Consequently, we aimed to provide a first such examination. To do so, we recruited three samples. We used Sample 1 (n = 106: track and field athletes) to examine the predictive utility of athlete burnout on a single performance, Sample 2 (n = 181: swimmers) to examine whether the findings from Sample 1 can be replicated in a different sport, and Sample 3 (n = 169: track and field athletes) to examine the predictive utility of athlete burnout on peak performance in a three-month period. Finally, having captured three samples each assessing the athlete burnout-performance relationship, we also sought to quantify the combined effect across these samples using a relatively new analytical technique - mini meta-analysis. Results from regression analyses showed that in at least two of the three samples total burnout, reduced sense of accomplishment, and sport devaluation each negatively predicted performance, whereas emotional and physical exhaustion was unrelated to performance. When we combined the samples, mini meta-analysis showed that total burnout, reduced sense of accomplishment, and sport devaluation each displayed a small-to-medium negative and significant meta-correlation with performance. The findings suggest that certain athlete burnout symptoms may indeed have negative consequences for sport performance, and that this is the case when considering a single performance and peak performance., Competing Interests: Declaration of competing interest None., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Knowledge of anticipatory stress responses before sports competitions is limited, thus this study examined the relationship between anticipatory stress in terms of salivary cortisol secretion in athletes on the morning of a competition and a comparison baseline day. Thirty-seven athletes collected three saliva samples over a 45-min period post-awakening (0, 30 and 45 min). Anticipatory stress was expressed as Area Under the Curve compared to ground (AUCg; total cortisol secretion). There was no significant difference in AUCg between baseline and competition days. However, a mixed two-factor ANOVA with day and sport type (individual vs. team) revealed a significant main effect of sport type ( p  < 0.01) and a significant interaction ( p  = 0.001). Individual athletes demonstrated increased AUCg on competition day compared to baseline, while team athletes demonstrated decreased AUCg on competition day compared to baseline. This blunting response was also observed when analysing the raw cortisol secretion levels upon awakening. These findings suggest there may be substantive differences in anticipatory stress between individual and team sport athletes., Competing Interests: No conflict of interest., (© 2024 The Authors.)

The Athlete Burnout Questionnaire (ABQ) is the gold standard measure for burnout in athletes. However, previous assessments of factorial validity have: (a) tested overly restrictive measurement models; (b) provided mixed support for factorial validity; and (c) not been applied to assess measurement invariance across gender, sport type, or age. To address these issues, we used ABQ data provided by 914 athletes (M age  = 21.75 years, SD = 8.79) and examined factorial validity using confirmatory factor analysis (CFA) and exploratory structural equation modelling (ESEM) techniques. We also examined measurement invariance of the ABQ data across reported gender (female, male), sport type (individual, team), and age (≤18 years, >18 years) groups. The analyses revealed that an ESEM model provided superior fit over the corresponding CFA model. In terms of measurement invariance, support was provided for the equivalence of the ABQ across each group. This means that researchers using the ABQ can collect data across these groups and examine potential differences with confidence that the ABQ is approximately invariant. In all, we provide evidence that the majority of ABQ items are key target construct indicators and the burnout construct (as measured by the ABQ) has the same structure and meaning to different athlete groups., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Although greater lifetime stressor exposure has been associated with physical and mental health issues in the general population, relatively little is known about how lifetime stressors impact the physical and mental health of elite athletes or the factors moderating this association. Given that many elite athletes show signs of perfectionism, and that this trait has been linked with ill-health, it is possible that perfectionism may moderate the lifetime stressor-health relationship. To test this possibility, we examined how cumulative lifetime stressor exposure was associated with general mental and physical health complaints in elite athletes, and the extent to which these associations were moderated by perfectionism. Participants were 110 elite athletes (64 female; M age = 29.98 years, SD = 10.54) who completed assessments of lifetime stressor exposure, physical health, psychological distress, and perfectionism. As hypothesised, hierarchical regression analyses revealed that experiencing more severe lifetime stressors was related to poorer physical and mental health. Furthermore, self-oriented perfectionism moderated the association between lifetime stressor count and severity and physical health, but not mental health. Overall, these data demonstrate stressor-specific effects among elite athletes and highlight the potential importance of assessing lifetime stressor exposure and perfectionistic tendencies in order to improve athlete health and well-being., Competing Interests: Disclosure statement No potential conflict of interest was reported by the author(s).

The relationship between perfectionism - perfectionistic strivings and perfectionistic concerns - and athletic performance is contested and inconsistent. The present study explored the possibility that one explanation for this inconsistency is the assumption that the relationship is linear. In two samples, we tested alternative non-linear relationships between perfectionism and real-world competitive athletic performance. Sample one comprised 165 Swedish track and field athletes (57 % competing in female category, 42 % in male category; M age  = 16.93 years) and sample two comprised 157 British track and field athletes (55 % competing in female category, 43 % in male category; M age  = 18.42 years). Testing for linear and non-linear relationships, we found a quadratic effect whereby higher perfectionistic strivings had both positive increasing (i.e., U-shape; sample 1) and positive decreasing (i.e., inverted U-shape; sample 2) relationships with performance. We conclude that there may be circumstances when perfectionistic strivings contribute to better and worse sport performance, and that this relationship can be curvilinear., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Cognitive-motivational-relational theory asserts that stress is a dynamic process, during which daily fluctuations in mediating processes (primary appraisals) can explain a range of ill-being and performance related outcomes. We tested this idea using a daily diary study to examine the relationships between primary appraisals, emotional exhaustion, and turnover intentions in sport coaches. Forty-four sport coaches (61% male; M age  = 34.98 years) completed an online questionnaire twice per day for five days. The findings of within-person analyses indicated that hourly harm appraisals positively predicted momentary emotional exhaustion over the diary period (β = .30, p  < .05). Additionally, emotional exhaustion positively predicted coaches' job turnover intentions (β = .18, p  < .05). The findings offer unique insight into the cognitive-motivational-relational theory of stress and emotion by illustrating how exhaustion and turnover intentions may be intensified as a function of primary appraisals experienced during the working day.

Perfectionistic pressure from coaches and parents is likely to contribute to the development of perfectionism in youth athletes. However, if and how perfectionistic pressure from coaches and parents interact to predict the development of perfectionism is unknown. With this in mind, the present study tested a new model - the 2 × 2 Model of Perfectionistic Pressure - that focuses on the different combinations of perfectionistic pressure youth athletes can experience. Four within-person combinations of perfectionistic pressure are identified and compared: Pure coach pressure (high coach pressure/low parental pressure), pure parental pressure (low coach pressure/high parental pressure), mixed pressure (high coach pressure/high parental pressure), and low pressure (low coach pressure/low parental pressure). To test the model, a sample of 210 youth athletes (M age = 14.68 years) completed measures of perfectionistic strivings, perfectionistic concerns, coach pressure to be perfect, and parental pressure to be perfect. Moderated hierarchical regression and simple slopes analyses revealed that mixed pressure was related to the highest levels of both perfectionistic strivings and perfectionistic concerns. The findings provide initial evidence for the new model and suggests it will be useful in studying the development of perfectionism and other outcomes in sport., Competing Interests: Declaration of competing interest The authors have no existing conflicts of interest that would have the potential to influence the present study., (Copyright © 2023 Elsevier Ltd. All rights reserved.)

Although trait perfectionism has been related to doping attitudes in athletes, research investigating variables that could account for relationships between perfectionism and doping outcomes has received scant attention. Consequently, the aim of the present study was to investigate whether perfectionism was related to doping willingness directly, and indirectly via moral disengagement. We recruited a sample of 204 student athletes (M age = 19.12 years, SD = 1.17, n = 81 females - 39.70%) who completed measures of perfectionistic strivings, perfectionistic concerns, doping moral disengagement, and doping willingness. Multiple regression analyses revealed a significant positive relationship between perfectionistic concerns and doping willingness (β = .13, p < .05) and a nonsignificant relationship between perfectionistic strivings and doping willingness (β = -.01, p > .05). Moreover, bias-corrected bootstrapped indirect effects revealed that doping moral disengagement mediated the relationship between perfectionistic concerns and doping willingness (ab = .12; 95% CI = 0.02 to 0.21). The findings suggest that the relationship between perfectionistic concerns and doping extends beyond attitudes - to doping willingness - and the propensity to morally disengage explains why this is the case., Competing Interests: Declaration of competing interest Given their role as an Editorial Board Member, Backhouse S.H. had no involvement in the peer-review of this article and had no access to information regarding its peer-review. All other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)

Understanding the factors shaping patterns of ecological resilience is critical for mitigating the loss of global biodiversity. Throughout aquatic environments, highly mobile predators are thought to serve as important vectors of energy between ecosystems thereby promoting stability and resilience. However, the role these predators play in connecting food webs and promoting energy flow remains poorly understood in most contexts. Using carbon and nitrogen isotopes, we quantified the use of several prey resource pools (small oceanic forage, large oceanics, coral reef, and seagrass) by 17 species of elasmobranch fishes ( n = 351 individuals) in The Bahamas to determine their functional diversity and roles as ecosystem links. We observed remarkable functional diversity across species and identified four major groups responsible for connecting discrete regions of the seascape. Elasmobranchs were responsible for promoting energetic connectivity between neritic, oceanic and deep-sea ecosystems. Our findings illustrate how mobile predators promote ecosystem connectivity, underscoring their functional significance and role in supporting ecological resilience. More broadly, strong predator conservation efforts in developing island nations, such as The Bahamas, are likely to yield ecological benefits that enhance the resilience of marine ecosystems to combat imminent threats such as habitat degradation and climate change.

Research suggests that trait perfectionism and perfectionistic self-presentation are related to orthorexia - a pathological obsession with correct nutrition. However, no studies have examined these relationships over time or compared the influence of the two aspects of perfectionism on orthorexia. In the present study we sought to address these two issues. Gym members who engaged in high degrees of exercise were recruited via social media platforms. They completed an online questionnaire that included the Multidimensional Perfectionism Scale-Short Form, Perfectionistic Self-Presentation Scale, and the Eating Habits Questionnaire on two occasions: 177 participants (Mean age = 31.6 years) initially completed the questionnaire and 82 completed the questionnaire six weeks later. A series of multiple regression analyses revealed that (i) trait perfectionism predicted an increase in orthorexia symptomatology over time with socially prescribed perfectionism and other-oriented perfectionism unique predictors of orthorexia, (ii) perfectionistic self-presentation predicted orthorexia over time with nondisplay of imperfection a unique predictor of orthorexia, and (iii) when considered alongside each other, only trait dimensions of perfectionism were unique predictors of orthorexia. The present study provides further evidence that perfectionism is related to orthorexia. In addition, the study also provides preliminary evidence that more engrained trait aspects of perfectionism are more predictive of orthorexia over time than the self-presentational aspects of perfectionism., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Objectives: The Dark Triad (psychopathy, Machiavellianism, and narcissism) has been linked to anti-social behaviour in sport, and while anti-social behaviour often involves aggression and violence, no research to date has examined the relationship between the Dark Triad and anger and aggression in athletes. The current two-sample study sought to address this gap., Design: Multi-sample cross-sectional design., Method: Sample 1 included 224 athletes (M AGE  = 23.85) and Sample 2 included 98 coach-athlete dyads (196 total; athlete M AGE  = 18.15, coaches M AGE  = 34.84). In both samples, facets of the Dark Triad were related to anger and aggression., Results: In Sample 1, regression analyses indicated that psychopathy positively predicted both anger and aggression and Machiavellianism positively predicted aggression. In Sample 2, actor-partner interdependence models indicated a combination of dyadic relationships (i.e., both actor [coach and athlete personality predicted their own anger and aggression] and partner effects [coach and athlete personality predicted the other's anger and aggression]). In this regard, actor effects were found between psychopathy and both anger and aggression and narcissism and aggression. Coach to athlete partner effects were found for narcissism and anger and Machiavellianism and aggression., Conclusions: Overall, the findings provide evidence for personal and interpersonal relationships between the Dark Triad and anger and aggression and highlight the potential for the darker side of both athlete and coach personality to influence athlete emotions., Competing Interests: Declaration of competing interest The authors report no conflict of interest., (Crown Copyright © 2022. Published by Elsevier Ltd. All rights reserved.)

Being a player with an F. A. Premier football academy is very prestigious for young players, but it can also be very stressful too. Coping with stress is particularly important given that one of the undesirable consequences linked to chronic stress is athlete burnout, which may also negatively impact psychological well-being. Understanding the most effective ways to cope with stress, therefore, is important for optimizing academy athlete education. Consequently, the aim of the present study was to examine whether coping predicted changes in athlete burnout, and whether athlete burnout predicted changes in well-being across 14 weeks of the competitive season. A sample of 26, under-18 and under-23, male F.A. Premier academy athletes completed weekly assessments of coping (task-, distraction-, and disengagement-oriented), athlete burnout, and psychological well-being on 14 separate occasions. The results of within-person analyses revealed that task-oriented coping predicted decreases in athlete burnout, which in turn predicted decreased well-being. Teaching high-level academy athletes task-oriented coping strategies may be useful in reducing athlete burnout, which may additionally protect athletes' well-being., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Nicholls, Madigan and Earle.)

Research has illustrated that athlete perfectionism predicts athlete burnout. The present study sought to build on existing research in two ways. First, we provide the first test of the relationship between performance perfectionism and athlete burnout. That is, whether the degree to which athlete's expect their own or others' sport performances to be perfect, predicts burnout. Second, we broaden the examination of the perfectionism-burnout relationship to include coaches by testing the incremental predictive ability of perceptions of coach other-oriented performance perfectionism (the degree to which coaches were perceived to expect perfect performances from others). A sample of 190 competitive adult athletes ( M age = 20.54) completed measures of their own performance perfectionism (self-oriented, socially prescribed, and other-oriented performance perfectionism), perceived coach other-oriented performance perfectionism, and burnout symptoms. Regression analyses indicated that both athlete self-oriented and socially prescribed performance perfectionism positively predicted athlete burnout. In addition, after controlling for all dimensions of athlete performance perfectionism, perceived coach other-oriented performance perfectionism positively predicted athlete burnout. The findings suggest that, in addition to their own perfectionism, when athletes perceive their coaches to be more perfectionistic towards others, they are more likely to experience burnout.

Purpose: The present study aimed to provide the first examination of whether perfectionistic self-presentation-an interpersonal expression of perfectionism-is related to orthorexia., Methods: We recruited a sample of 150 exercisers (Mean age = 27.7 years). Participants completed the Perfectionistic Self-Presentation Scale and the ORTO-15 on a single occasion., Results: Two dimensions of perfectionistic self-presentation-perfectionistic self-promotion and nondisplay of imperfection-showed significant positive correlations with orthorexia. In addition, in multiple regression analyses controlling for the overlap between dimensions, perfectionistic self-promotion emerged as the strongest and only significant predictor of orthorexia., Conclusion: Perfectionistic self-presentation is positively associated with orthorexia in exercisers. Perfectionistic self-promotion-a need to portray an image of perfection to others-is primarily responsible for this relationship., Level of Evidence: Cross-sectional study, Level V., (© 2021. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)

With the increasing prevalence of mental health difficulties in sport, athletes may be at greater risk of burnout than ever before. In the present study, we tested this possibility by examining whether average athlete burnout levels have changed over the past 2 decades, from 1997 to 2019. A literature search returned 91 studies (N = 21,012) and 396 effect sizes. Findings from cross-temporal meta-analysis suggested that burnout symptoms have increased over the past 2 decades. Specifically, we found that athletes' mean levels of reduced sense of athletic accomplishment and sport devaluation have increased. As burnout symptoms are now typically higher among athletes than in the past, we can expect more athletes to be prone to the negative effects of burnout. Sport is therefore in urgent need of prevention and intervention strategies to stop and reverse this trend.

The skipjack tuna ( Katsuwonus pelamis ) is a mesopredator fish species with seasonal abundance in waters off Taiwan. Regional ecological and life-history information has been historically lacking for this species. In recent years, stable isotope analysis (SIA) of carbon and nitrogen has been used to assess predator feeding ecology and broader ecosystem trophic dynamics. This study evaluated comparative skipjack feeding ecology in distinct regions off Taiwan, combining traditional stomach content analysis with SIA of individuals off western ( n = 43; 2020) and eastern ( n = 347; 2012-2014 and n = 167; 2020) Taiwan. The stomach content analysis showed the most important prey to be ponyfish ( Photopectoralis bindus ) in western Taiwan and epipelagic squids ( Myopsina spp.) and carangids ( Decapterus macrosoma ;) in eastern Taiwan from 2012 to 2014 and epipelagic carangids ( Decapterus spp.) and flying fishes ( Cheilopogon spp.) in eastern Taiwan in 2020, suggesting that the skipjack tuna is a generalist predator across regions. In contrast, time-integrated diet estimates from Bayesian mixing models indicated the importance of cephalopods and crustaceans as prey, potentially demonstrating more mesopelagic feeding in less productive waters during skipjack migrations outside the study regions. Skipjack off western Taiwan had a slightly higher estimated trophic position than in the waters off eastern Taiwan, potentially driven by the varying nutrient-driven pelagic food web structures. Skipjack SI values increased with body size off eastern Taiwan but not in western waters, suggesting that opportunistic predation can still result in different predator-prey size dynamics between regions.

Pacific Ocean tuna is among the most-consumed seafood products but contains relatively high levels of the neurotoxin methylmercury. Limited observations suggest tuna mercury levels vary in space and time, yet the drivers are not well understood. Here, we map mercury concentrations in skipjack tuna across the Pacific Ocean and build generalized additive models to quantify the anthropogenic, ecological, and biogeochemical drivers. Skipjack mercury levels display a fivefold spatial gradient, with maximum concentrations in the northwest near Asia, intermediate values in the east, and the lowest levels in the west, southwest, and central Pacific. Large spatial differences can be explained by the depth of the seawater methylmercury peak near low-oxygen zones, leading to enhanced tuna mercury concentrations in regions where oxygen depletion is shallow. Despite this natural biogeochemical control, the mercury hotspot in tuna caught near Asia is explained by elevated atmospheric mercury concentrations and/or mercury river inputs to the coastal shelf. While we cannot ignore the legacy mercury contribution from other regions to the Pacific Ocean (e.g., North America and Europe), our results suggest that recent anthropogenic mercury release, which is currently largest in Asia, contributes directly to present-day human mercury exposure., Competing Interests: The authors declare no competing interest., (Copyright © 2021 the Author(s). Published by PNAS.)

The expansion of urban landscapes has both negative and positive effects on wildlife. Understanding how different species respond to urbanization is key to assessing how urban landscapes influence regional wildlife behavior and ecosystem structure. Gulls are often described as strong urban adapters, but few studies have explored species-specific differences in habitat use. Here, we use GPS tracking in conjunction with stable isotope analysis (SIA) to quantify the habitat use and trophic ecology of great black-backed gulls (Larus marinus) and herring gulls (L. argentatus) in an urbanized area. Non-Metric Multidimensional Scaling (NMDS) of foraging locations revealed significant differences in the habitat use between species. Great black-backed gulls foraged primarily in marine habitats and herring gulls foraged primarily in specific urban habitats (e.g., landfills, dumpsters) and showed higher site fidelity in terms of the proportion of foraging sites revisited. Further, great black-backed gulls had significantly higher δ 15 N and δ 13 C than herring gulls, reflecting the use of marine, rather than urban, food sources. This study highlights the variability in urban habitat utilization among closely related species, assesses stable isotope signatures of urban diets in wild birds, and discusses ecological implications of the relative contribution of urban and marine foraging., (© 2021. The Author(s).)

The Dark Triad traits (Machiavellianism, narcissism, and psychopathy) are prevalent in athletes. However, currently, we do not know whether the Dark Triad confers any competitive advantages in sport. To address this issue, the present study had two aims. First, to examine whether the Dark Triad predicted task performance in a basketball free throw task. Second, to examine whether competitive orientations explained (i.e. mediated) this relationship. A sample of 189 athletes (mean age = 19.11 years) completed measures of the Dark Triad, competitive orientations, and task performance (basketball free throw task). Regression analyses indicated that the Dark Triad predicted better task performance. In addition, mediation analyses indicated that the Dark Triad-performance relationship was explained by both hypercompetitive and self-developmental competitive orientations. The present study provides the first evidence that the Dark Triad may lead to better task performance in sport, and that this effect may be driven by athletes' competitive orientations.

Field tests are commonly used by sport scientists for performance monitoring and evaluation. While perfectionism predicts performance in a range of contexts, it is currently unclear whether perfectionism predicts performance in such tests. To address this lack of understanding, the present study examined the relationships between perfectionism and fitness-based field test performance across three athlete samples. After completing a measure of perfectionism (striving for perfection and negative reactions to imperfection), sample one ( n  = 129 student athletes) participated in a series of countermovement jumps and 20-metre sprint trials, sample two ( n  = 136 student athletes) participated in an agility task, and sample three ( n  = 116 junior athletes) participated in the Yo-Yo intermittent recovery test (level one). Striving for perfection predicted better sprint and Yo-Yo test performance. Negative reactions to imperfection predicted worse sprint performance. Mini meta-analyses of the combined data ( N  = 381) showed that striving for perfection was positively related to performance ( r +  = .24), but negative reactions to imperfection was unrelated to performance ( r +  = -.05). The present findings indicate that striving for perfection may predict better fitness-based field test performance, while negative reactions to imperfection appears to be ambiguous.

Stable isotope analysis (SIA) measurements from long-term captivity studies provide required parameters for interpretation of consumer SIA data. We raised young-of-the-year (14-19 cm) California yellowtail (Seriola dorsalis) on a low δ 15 N and δ 13 C diet (pellet aquaculture feed) for 525 days, then switched to a high δ 15 N and δ 13 C diet (mackerel and squid) for 753 days. Yellowtail muscle was sequentially sampled from each individual after the diet switch (0 to 753 days) and analyzed for δ 15 N and δ 13 C, allowing for calculation of diet-tissue discrimination factors (DTDFs) from two isotopically different diets (low δ 15 N and δ 13 C: pellets; high δ 15 N and δ 13 C: fish/squid) and turnover rates of 15 N and 13 C. DTDFs were diet dependent: Δ 15 N = 5.1‰, Δ 13 C = 3.6‰ for pellets and Δ 15 N = 2.6‰, Δ 13 C = 1.3‰ for fish/squid. Half-life estimates from 15 N and 13 C turnover rates for pooled yellowtail were 181 days and 341 days, respectively, but varied considerably by individual ( 15 N: 99-239 d; 13 C: 158-899 d). Quantifying DTDFs supports isotopic approaches to field data that assume isotopic steady-state conditions (e.g., mixing models for diet reconstruction). Characterizing and quantifying turnover rates allow for estimates of diet/habitat shifts and "isotopic clock" approaches, and observed inter-individual variability suggests the need for large datasets in field studies. We provide diet-dependent DTDFs and growth effects on turnover rates, and associated error around these parameters, for application to field-collected SIA data from other large teleosts.

Perfectionism may promote engagement in illegal and unacceptable behaviours such as doping. To examine this idea, in the present study, we had two aims. First, we re-examined the relationship between perfectionism and attitudes towards doping and, in doing so, conducted a continuously cumulating meta-analysis. Second, we extended our understanding of this relationship by providing the first test of the 2 × 2 model of perfectionism in context of doping. A sample of 181 university athletes (mean age 18.5 years) completed measures of perfectionism (evaluative concerns perfectionism [ECP] and personal standards perfectionism [PSP]) and attitudes toward doping. A continuously cumulating meta-analysis based on five studies (including the present study; N  = 952) indicated that ECP showed a significant small-to-medium positive relationship with attitudes towards doping ( r +  = .21), whereas PSP showed a nonsignificant small positive relationship with attitudes towards doping ( r +  = .07). In addition, moderated regression analysis provided support for two hypotheses of the 2 × 2 model. Specifically, pure ECP (high ECP, low PSP) was associated with more favourable attitudes towards doping than mixed perfectionism (high ECP, high PSP) and non-perfectionism (low ECP, low PSP). The present findings suggest that ECP is a significant positive predictor of attitudes towards doping and that athletes who exhibit a combination of high ECP and low PSP are the most likely to be at risk of doping. Consequently, a focus on reducing ECP may be a valuable addition to anti-doping education programmes.

We examined the relationships between the Dark Triad personality traits (Machiavellianism, narcissism, and psychopathy), attitudes towards doping, and cheating behaviour among athletes. One-hundred and sixty-four athletes completed a completed a matrix solving task within a specific time limit. Participants were told they would receive a financial reward for the total number matrices they could solve, but only 13 of the 20 matrices were solvable. This provided the incentive and opportunity for the athletes to cheat. Following this, athletes completed two questionnaires, which assessed the Dark Triad and their attitudes towards doping. All three Dark Triad personality traits correlated positively with attitudes towards doping and cheating behaviour. Regression analyses revealed that psychopathy and narcissism positively predicted attitudes towards doping, and narcissism emerged as a positive predictor of cheating behaviour. Attitudes towards doping correlated positively with cheating behaviour. The Dark Triad appears to be important in relation to both attitudes towards doping and cheating behaviour among athletes. In addition, our findings illustrate that favourable attitudes towards doping are linked with actual cheating among athletes. National Anti-Doping Organizations, sports federations, and coaches could assess athletes' Dark Triad scores and attitudes towards doping in order to identify who may be more likely to cheat.

Initial research suggests that parental perfectionism is central to the development of athlete perfectionism. However, it is unclear whether perceived or actual parental perfectionism is most important. The present study aimed to address this issue in two ways. First, we re-examined the predictive ability of actual versus perceived parental perfectionism on athlete perfectionism. Second, for the first time, we tested whether perceived parental perfectionism mediated the relationship between actual parental perfectionism and athlete perfectionism. A sample of 150 junior athletes and their parents completed measures of perfectionism (perfectionistic strivings and perfectionistic concerns). Junior athletes completed two measures, one of their own perfectionism and one of perceptions of their parents' perfectionism. Parents completed one measure of their own perfectionism. Regression analyses showed that perceived parental perfectionism predicted athlete perfectionism over and above actual parental perfectionism. Mediation analyses provided support for our proposed model. Overall, the findings suggest that both actual and perceived parental perfectionism are important in the development of perfectionism in junior athletes.

Objective: This study aimed to measure depressive symptoms, anxiety symptoms and psychological well-being among a sample of Super League players, the highest tier of professional rugby league in the northern hemisphere., Methods: Between November 2018 and July 2019, a sample of 233 Super League players completed questionnaires that assessed depressive symptoms, anxiety symptoms and psychological well-being., Results: Players exhibited normal (85.8%), mild (11.6%) or moderate/severe (2.6%) depressive symptoms. Additionally, players reported normal (67.4%), mild (18.9%) or moderate/severe (13.7%) anxiety symptoms. The mean psychological well-being score across the sample was 25.07 (SD=4.34). 35.2% of players scored below average for this construct., Conclusion: The prevalence of mild depressive symptoms, moderate/severe depressive symptoms and mild anxiety symptoms among Super League players preliminary appear higher than in the general population from the UK. Much more research is needed to understand mental health among elite athletes., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Perfectionism is related to precompetition emotions in athletes. However, it is unclear why this is the case. In the present study, the authors sought to determine whether perfectionistic cognitions explain this relationship and mediate the relationships between self-oriented perfectionism (SOP), socially prescribed perfectionism (SPP), and general precompetition emotions and multidimensional anxiety and anger. The authors adopted a three-wave longitudinal design and examined between- and within-person effects in a sample of 352 youth footballers (Mage = 14.03 years, SD = 2.30). At the between-person level, perfectionistic cognitions mediated the relationships between SOP, SPP, and all general precompetition emotions plus multidimensional anxiety and anger. At the within-person level, perfectionistic cognitions mediated the relationships between SOP, SPP, and general anxiety and anger plus multidimensional anxiety and anger. Our findings imply that athletes higher in SOP and SPP experience more anxiety and anger when the frequency of perfectionistic cognitions increases in the lead-up to competition.

The development of cynical attitudes towards elite sport is a core symptom of athlete burnout and has been associated with dropout from elite sport. To date, this phenomenon has mainly been studied by investigating explicit attitudes towards sport, whereas athletes' automatic evaluations (i.e. implicit attitudes) that have been shown to influence behavior as well were not considered. This study aimed to compare explicit and implicit attitudes towards sport of young elite athletes with high ( N = 24) versus low ( N = 26) burnout symptoms. Using self-reported measures, general and athlete burnout symptoms were assessed. Additionally, a single-target implicit association test was administered to examine participants' automatic evaluation of sport. Statistical analysis revealed greater emotional/physical exhaustion and sport devaluation in athletes reporting high compared to low burnout symptoms. Implicit attitudes towards sport did not significantly differ between the groups. Furthermore, no significant correlations were observed between different athlete burnout symptoms and implicit attitudes. Athletes with high burnout symptoms show a tendency to explicitly detach themselves from sport, thus fostering sport devaluation as a core symptom of athlete burnout. However, this process does not seem to be reflected in their implicit attitudes towards sport.

To gain a better understanding of the trophic ecology of Pacific blue marlin Makaira nigricans off eastern Taiwan, nitrogen and carbon stable isotopes (δ 15 N and δ 13 C) and Bayesian mixing models were used to explore trophic dynamics and potential ontogenetic feeding shifts across M. nigricans of different size classes. Makaira nigricans samples from east of Taiwan (n = 213) and Palau (n = 37), as well as their prey (n = 70), were collected during 2012 and 2013. Results indicated increases in δ 15 N with size, with values of larger size classes (> 200 cm eye-to-fork length; L EF ) significantly higher than those < 200 cm L EF . Values of δ 13 C were negatively correlated with size. Makaira nigricans > 200 cm L EF had the highest estimated trophic position (4.44) and also exhibited ontogenetic changes in trophic position. Large M. nigricans fed more on dolphinfish Coryphaena hippurus and hairtail Trichiurus lepturus, while smaller M. nigricans consumed smaller forage fish (e.g., moonfish Mene maculata) and cephalopods. These changes may relate to greater swimming speeds and vertical habitat use in larger M. nigricans, allowing capture and consumption of larger prey items at higher trophic positions. The high trophic level of M. nigricans east of Taiwan confirms its important role as an apex predator in marine food webs and how ecological role changes with size., (© 2019 The Fisheries Society of the British Isles.)

Perfectionism predicts cognitions, emotions, and behaviors in sport. Nonetheless, our understanding of the factors that influence its development is limited. The authors sought to address this issue by examining the role of coach and parental pressure in the development of perfectionism in sport. Using 3 samples of junior athletes (16-19 years; cross-sectional n  = 212, 3-month longitudinal n  = 101, and 6-month longitudinal n  = 110), the authors examined relations between coach pressure to be perfect, parental pressure to be perfect, perfectionistic strivings, and perfectionistic concerns. Mini meta-analysis of the combined cross-sectional data ( N  = 423) showed that both coach pressure and parental pressure were positively correlated with perfectionistic strivings and perfectionistic concerns. In contrast, longitudinal analyses showed that only coach pressure predicted increased perfectionistic strivings and perfectionistic concerns over time. Overall, our findings provide preliminary evidence that coaches may play a more important role in the development of junior athletes' perfectionism than parents.

Few studies have examined the association between sleep and burnout symptoms in elite athletes. We recruited 257 young elite athletes (M age  = 16.8 years) from Swiss Olympic partner schools. Of these, 197 were reassessed 6 months later. Based on the first assessment, 24 participants with clinically relevant burnout symptoms volunteered to participate in a polysomnographic examination and were compared with 26 (matched) healthy controls. Between 12% and 14% of young elite athletes reported burnout symptoms of potential clinical relevance, whereas 4-11% reported clinically relevant insomnia symptoms. Athletes with clinically relevant burnout symptoms reported significantly more insomnia symptoms, more dysfunctional sleep-related cognitions, and spent less time in bed during weeknights (p < .05). However, no significant differences were found for objective sleep parameters. A cross-lagged panel analysis showed that burnout positively predicted self-reported insomnia symptoms. Cognitive-behavioral interventions to treat dysfunctional sleep-related cognitions might be a promising measure to reduce subjective sleep complaints among young elite athletes.

Objectives: To examine in a sample of young elite athletes (a) the presence of clinically relevant symptoms of burnout and depression, and (b) a possible interaction of perceived stress and mental toughness in the prediction of burnout and depressive symptoms., Design: 6-month prospective study., Methods: A representative sample of 257 young elite athletes (M=16.82years, SD=1.44, 36% females) was recruited in North-Western Switzerland. 197 athletes were followed-up across a 6-month period. Burnout was assessed with the Shirom-Melamed Burnout Measure (SMBM), and depression with the 9-item depression module of the Patient Health Questionnaire (PHQ). Values of ≥4.40 (SMBM) and >14 (PHQ-9) were considered indicative of clinically relevant burnout or depression. Stress perceptions were assessed with the Perceived Stress Scale (PSS), and mental toughness with the Mental Toughness Questionnaire (MTQ). Hierarchical regression analyses were used to test stress-buffering effects., Results: The percentage of athletes with clinically relevant levels of burnout and depressive symptoms was 12% and 9%, respectively. Both cross-sectional and prospective analyses showed that compared to participants with low mental toughness, those with higher mental toughness scores reported significantly fewer mental health issues, when exposed to high stress. By contrast, when stress levels were low, mental toughness was unrelated to psychological health complaints., Conclusions: About every tenth young elite athlete reported burnout or depressive symptoms of potential clinical relevance. While high perceived stress was associated with increased psychological health complaints, mental toughness was able to off-set some of the negative consequences resulting from high stress exposure., (Copyright © 2018 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.)

Recent research found perfectionistic strivings to predict performance in a novel basketball task among novice basketball players. The current study builds on this research by examining whether this is also the case for performance in a familiar basketball training task among experienced basketball players, and whether achievement goals mediated any observed relationships. Perfectionistic strivings, perfectionistic concerns, and 3 × 2 achievement goals were assessed prior to basketball training performance in 90 basketball players (mean age 20.9 years). Regression analyses showed that perfectionistic strivings predicted better performance. Furthermore, mediation analyses showed that other-approach goals (e.g. beliefs that one should and can outperform others) accounted for this relationship. The findings suggest that perfectionistic strivings may predict better performance in both novel and familiar athletic contexts. In addition, beliefs about the importance and ability to outperform others may explain this relationship.

Pelagic ecosystems are changing due to environmental and anthropogenic forces, with uncertain consequences for the ocean's top predators. Epipelagic and mesopelagic prey resources differ in quality and quantity, but their relative contribution to predator diets has been difficult to track. We measured mercury (Hg) stable isotopes in young (<2 years old) Pacific bluefin tuna (PBFT) and their prey species to explore the influence of foraging depth on growth and methylmercury (MeHg) exposure. PBFT total Hg (THg) in muscle ranged from 0.61 to 1.93 μg g -1 dw (1.31 μg g -1 dw ±0.37 SD; 99% ± 6% MeHg) and prey ranged from 0.01 to 1.76 μg g -1 dw (0.13 μg g -1 dw ±0.19 SD; 85% ± 18% MeHg). A systematic decrease in prey δ 202 Hg and Δ 199 Hg with increasing depth of occurrence and discrete isotopic signatures of epipelagic prey (δ 202 Hg: 0.74 to 1.49‰; Δ 199 Hg: 1.76-2.96‰) and mesopelagic prey (δ 202 Hg: 0.09 to 0.90‰; Δ 199 Hg: 0.62-1.95‰) allowed the use of Hg isotopes to track PBFT foraging depth. An isotopic mixing model was used to estimate the dietary proportion of mesopelagic prey in PBFT, which ranged from 17% to 55%. Increased mesopelagic foraging was significantly correlated with slower growth and higher MeHg concentrations in PBFT. The slower observed growth rates suggest that prey availability and quality could reduce the production of PBFT biomass.

Training distress occurs when athletes fail to cope with physiological and psychological stress and can be an early sign of overtraining syndrome. Recent research has found that perfectionism predicts increases in training distress in junior athletes over time. The current study provides the first empirical test of the possibility that coping tendencies mediate the perfectionism-training distress relationship. Adopting a cross-sectional design, 171 junior athletes (mean age = 18.1 years) completed self-report measures of perfectionistic strivings, perfectionistic concerns, problem-focused coping, avoidant coping, and training distress. Structural equation modelling revealed that avoidant coping mediated the positive relationship between perfectionistic concerns and training distress, and mediated the negative relationship between perfectionistic strivings and training distress. Problem-focused coping did not mediate any relationships between dimensions of perfectionism and training distress. The findings suggest that the tendency to use coping strategies aimed at avoiding stress may partly explain the relationship between perfectionism and training distress but the tendency to use, or not use, problem-focussed coping does not.

There has been an exponential growth in research examining the neurological basis of human cognition and learning. Little is known, however, about the extent to which sports coaches are aware of these advances. Consequently, the aim of the present study was to examine the prevalence of pseudoscientific ideas among British and Irish sports coaches. In total, 545 coaches from the United Kingdom and Ireland completed a measure that included questions about how evidence-based theories of the brain might enhance coaching and learning, how they were exposed to these different theories, and their awareness of neuromyths. Results revealed that the coaches believed that an enhanced understanding of the brain helped with their planning and delivery of sports sessions. Goal-setting was the most frequently used strategy. Interestingly, 41.6% of the coaches agreed with statements that promoted neuromyths. The most prevalent neuromyth was "individuals learn better when they receive information in their preferred learning style (e.g., auditory, visual, or kinesthetic)," which 62% of coaches believed. It is apparent that a relatively large percentage of coaches base aspects of their coaching practice on neuromyths and other pseudoscientific ideas. Strategies for addressing this situation are briefly discussed and include changing the content of coach education programs.

According to the stress-injury model (Williams & Andersen, 1998), personality factors predisposing athletes to elevated levels of stress may increase the risk of injury. As perfectionism has been associated with chronic stress, it may be one such personality factor. So far, however, no study has investigated the relationships between perfectionism and injury utilising a prospective design. Therefore, the present study examined perfectionistic strivings, perfectionistic concerns and injury in 80 junior athletes from team and individual sports (mean age 17.1 years; range 16-19 years) over 10 months of active training. The results of logistic regression analyses showed that perfectionism positively predicted injury, but only perfectionistic concerns emerged as a significant positive predictor. The likelihood of sustaining an injury was increased by over two times for each 1 SD increase in perfectionistic concerns. The findings suggest that perfectionistic concerns may be a possible factor predisposing athletes to an increased risk of injury.

Sharks are a diverse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits in trophic interactions between sharks found in different habitats. We show that populations of shelf-dwelling sharks derive a substantial proportion of their carbon from regional pelagic sources, but contain individuals that forage within additional isotopically diverse local food webs, such as those supported by terrestrial plant sources, benthic production and macrophytes. In contrast, oceanic sharks seem to use carbon derived from between 30° and 50° of latitude. Global-scale compilations of stable isotope data combined with biogeochemical modelling generate hypotheses regarding animal behaviours that can be tested with other methodological approaches.

Purpose: Numerous studies have found perfectionism to show positive relations with eating disorder symptoms, but so far no study has examined whether perfectionistic self-presentation can explain these relations or whether the relations are the same for different eating disorder symptom groups., Methods: A sample of 393 female university students completed self-report measures of perfectionism (self-oriented perfectionism, socially prescribed perfectionism), perfectionistic self-presentation (perfectionistic self-promotion, nondisplay of imperfection, nondisclosure of imperfection), and three eating disorder symptom groups (dieting, bulimia, oral control). In addition, students reported their weight and height so that their body mass index (BMI) could be computed., Results: Results of multiple regression analyses controlling for BMI indicated that socially prescribed perfectionism positively predicted all three symptom groups, whereas self-oriented perfectionism positively predicted dieting only. Moreover, perfectionistic self-presentation explained the positive relations that perfectionism showed with dieting and oral control, but not with bulimia. Further analyses indicated that all three aspects of perfectionistic self-presentation positively predicted dieting, whereas only nondisclosure of imperfection positively predicted bulimia and oral control. Overall, perfectionistic self-presentation explained 10.4-23.5 % of variance in eating disorder symptoms, whereas perfectionism explained 7.9-12.1 %., Conclusions: The findings suggest that perfectionistic self-presentation explains why perfectionistic women show higher levels of eating disorder symptoms, particularly dieting. Thus, perfectionistic self-presentation appears to play a central role in the relations of perfectionism and disordered eating and may warrant closer attention in theory, research, and treatment of eating and weight disorders.