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A growing body of evidence has provided support for the beneficial impact of human-animal interactions on a range of biological, social, and psychological outcomes for humans; however, less is conclusively known about the association between animal companionship and psycho-social health specifically among aging populations. In this study, we assessed the association between animal companionship and psycho-social well-being in a large sample (N = 30,865) of community dwelling Canadians aged 45 and older. Using cross-sectional data from the Canadian Community Health Survey-Healthy Aging, we conducted hierarchical multiple regression to assess the relationship between animal companionship and four domains of psycho-social well-being (satisfaction with life, loneliness, depression, and levels of social support) after controlling for socio-demographic factors and psycho-social measures. Results indicate that those with animal companionship report significantly higher levels of social support than aging Canadians without animal companionship; however, animal companionship was also associated with significantly lower levels of life satisfaction and higher levels of both loneliness and depression. These findings complicate the existing literature on human-animal interactions by suggesting the benefits associated with animal companionship may vary across distinct domains of psycho-social health. As such, results from this study highlight the need for more nuanced model specifications when assessing the relationship between animal companionship and psycho-social well-being. Implications of these findings for the provision of social services to older adults with pets are provided., Competing Interests: Declaration of competing interest The authors of this manuscript have no actual or potential conflicts of interest (personal, financial, or otherwise) to disclose in relation to the subject matter of this manuscript., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Recent proliferation of GPS technology has transformed animal movement research. Yet, time-series data from this recent technology rarely span beyond a decade, constraining longitudinal research. Long-term field sites hold valuable historic animal location records, including hand-drawn maps and semantic descriptions. Here, we introduce a generalised workflow for converting such records into reliable location data to estimate home ranges, using 30 years of sleep-site data from 11 white-faced capuchin (Cebus imitator) groups in Costa Rica. Our findings illustrate that historic sleep locations can reliably recover home range size and geometry. We showcase the opportunity our approach presents to resolve open questions that can only be addressed with very long-term data, examining how home ranges are affected by climate cycles and demographic change. We urge researchers to translate historical records into usable movement data before this knowledge is lost; it is essential to understanding how animals are responding to our changing world., (© 2024 The Author(s). Ecology Letters published by John Wiley & Sons Ltd.)

Tool-using primates often show sex differences in both the frequency and efficiency of tool use. In species with sex-biased dispersal, such within-group variation likely shapes patterns of cultural transmission of tool-use traditions between groups. On the Panamanian islands of Jicarón and Coiba, a population of white-faced capuchins (Cebus capucinus imitator)-some of which engage in habitual stone tool use-provide an opportunity to test hypotheses about why such sex-biases arise. On Jicarón, we have only observed males engaging in stone tool use, whereas on Coiba, both sexes are known to use tools. Using 5 years of camera trap data, we provide evidence that this variation likely reflects a sex difference in tool use rather than a sampling artifact, and then test hypotheses about the factors driving this pattern. Differences in physical ability or risk-aversion, and competition over access to anvils do not account for the sex-differences in tool-use we observe. Our data show that adult females are physically capable of stone tool use: adult females on Coiba and juveniles on Jicarón smaller than adult females regularly engage in tool use. Females also have ample opportunity to use tools: the sexes are equally terrestrial, and competition over anvils is low. Finally, females rarely scrounge on left-over food items either during or after tool-using events, suggesting they are not being provisioned by males. Although it remains unclear why adult white-faced capuchin females on Jicarón do not use stone-tools, our results illustrate that such sex biases in socially learned behaviors can arise even in the absence of obvious physical, environmental, and social constraints. This suggests that a much more nuanced understanding of the differences in social structure, diet, and dispersal patterns are needed to explain why sex-biases in tool use arise in some populations but not in others., (© 2024 The Authors. American Journal of Primatology published by Wiley Periodicals LLC.)

Terrestrial mammals exploiting coastal resources must cope with the challenge that resource availability and accessibility fluctuate with tidal cycles. Tool use can improve foraging efficiency and provide access to structurally protected resources that are otherwise unavailable (e.g. molluscs and fruits). To understand how variable accessibility of valuable resources shapes behavioural patterns, and whether tool use aids in the efficient exploitation of intertidal resources, we compared the relationship between tidal cycles and activity patterns of tool-using versus non-tool-using groups of white-faced capuchin monkeys on Jicarón Island in Coiba National Park, Panama. Although tool use on Jicarón is localized to a small stretch of coast (approx. 1 km), all coastal groups forage on intertidal resources. Using more than 5 years of camera trap data at varying distances from the coast, we found that capuchins on Jicarón showed increased coastal activity during specific parts of the tidal cycle, and that this relationship differed between tool-using and non-tool-using groups, as well as between seasons. Activity patterns of tool-using capuchins were more strongly and consistently tied to tidal cycles compared with non-tool-users, indicating that tool use might allow for more efficient exploitation of tidal resources. Our findings highlight the potential of tool use to aid niche expansion., Competing Interests: The authors have no conflicts of interest to declare that are relevant to the content of this article., (© 2023 The Authors.)

Two-option choice experimental designs are the most commonly employed framework for identifying evidence of social learning or social learning strategies in captive and wild populations. In nature, however, animals often choose from more than two behaviours, and multiple innovations may arise simultaneously. Studies of animal social learning are often constrained by small sample sizes, which limit researchers' ability to convincingly identify the proposed social learning strategy responsible for behavioural choice. In this study, I examine whether expanding behavioural options from k = 2 to k > 2 and increasing sample size affects inferential power in identifying social learning strategies. I focus on three frequency-dependent learning strategies: conformist transmission, unbiased transmission and anti-conformist transmission. I simulate 100 datasets for 72 parameter combinations, yielding 7200 simulations. I evaluate number of options (k = 2, 3, 4, 5), population size (n = 5, 10, 25, 50, 100, 250) and the logarithmic strength of frequency dependence (log(f) = log(1∕3), log(1), log(3)). I then fit a Bayesian social learning model to simulated data to evaluate the percent of the posterior consistent with type of frequency dependence, posterior standard deviations, highest posterior density intervals and posterior medians relative to the true simulated value of log(f). I show that increasing the number of options an animal can choose from increases the accuracy and certainty of identifying the type and magnitude of frequency-dependent social learning. These effects are particularly pronounced at small to intermediate sample sizes, which are common in empirical studies of animal social learning. These findings suggest that knowing what an animal did not choose is equally important as knowing what an animal did choose when identifying social learning strategies. By strategically increasing the number of behaviours from which an animal can choose, researchers can increase inferential power in identifying social learning strategies without increasing sample size, that is, adding additional animals or collecting more data., (© 2022 The Author. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society.)

Molecular charge doping involves the formation of donor-acceptor charge-transfer complexes (CTCs) through integer or partial electron transfer; understanding how local chemical environment impacts complexation is important for controlling the properties of organic materials. We present steady-state and temperature-dependent spectroscopic investigations of the p-dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F 4 TCNQ) complexed with the electron donor and hole transport material N , N '-diphenyl- N , N '-di- p -tolylbenzene-1,4-diamine (MPDA). Equilibrium formation constants ( K CT ) were determined for donor-acceptor pairs dissolved in a series of solvents covering a range of values of permittivity. A threshold for highly favorable complex formation was observed to occur at ϵ ∼ 8-9, with large (>10 4 ) and small (<10 3 ) values of K CT obtained in solvents of higher and lower permittivity, respectively, but with chloroform (ϵ = 4.81) exhibiting an anomalously high formation constant. Temperature-dependent formation constants were determined in order to evaluate the thermodynamics of complex formation. In 1,2-dichloroethane (ϵ = 10.36) and chlorobenzene (ϵ = 5.62), complex formation is both enthalpically and entropically favorable, with higher enthalpic and entropic stabilization in the solvent with higher permittivity. Complexation in chloroform is exothermic and entropically disfavored, indicating that specific, inner-shell solvent-solute interactions stabilize the charge-separated complex and result in a net increase in local solution structure. Our results provide insight into how modification to the chemical environment may be utilized to support stable integer charge transfer for molecular doping applications and requiring only modest changes in local permittivity.

Culture is an outcome of both the acquisition of knowledge about behaviour through social transmission, and its subsequent production by individuals. Acquisition and production are often discussed or modelled interchangeably, yet to date no study has explored the consequences of their interaction for cultural diffusions. We present a generative model that integrates the two, and ask how variation in production rules might influence diffusion dynamics. Agents make behavioural choices that change as they learn from their productions. Their repertoires may also change, and the acquisition of behaviour is conditioned on its frequency. We analyse the diffusion of a novel behaviour through social networks, yielding generalizable predictions of how individual-level behavioural production rules influence population-level diffusion dynamics. We then investigate how linking acquisition and production might affect the performance of two commonly used inferential models for social learning; network-based diffusion analysis, and experience-weighted attraction models. We find that the influence that production rules have on diffusion dynamics has consequences for how inferential methods are applied to empirical data. Our model illuminates the differences between social learning and social influence, demonstrates the overlooked role of reinforcement learning in cultural diffusions, and allows for clearer discussions about social learning strategies.

Purpose: Iodinated contrast media is one of the most frequently administered pharmaceuticals. In Canada, over 5.4 million computed tomography (CT) examinations were performed in 2019, of which 50% were contrast enhanced. Acute kidney injury (AKI) occurring after iodinated contrast administration was historically considered a common iatrogenic complication which was managed by screening patients, prophylactic strategies, and follow-up evaluation of renal function. The Canadian Association of Radiologists (CAR) initially published guidelines on the prevention of contrast induced nephropathy in 2007, with an update in 2012. However, new developments in the field have led to the availability of safer contrast agents and changes in clinical practice, prompting a complete revision of the earlier recommendations., Information Sources: Published literature, including clinical trials, retrospective cohort series, review articles, and case reports, along with expert opinions from radiologists and nephrologists across Canada., Methods: The leadership of the CAR formed a working group of radiologists and nephrologists with expertise in contrast administration and patient management related to contrast-associated AKI. We conducted a comprehensive review of the published literature to evaluate the evidence about contrast as a cause of AKI, and to inform evidence-based recommendations. Based on the available literature, the working group developed consensus recommendations., Key Findings: The working group developed 21 recommendations, on screening, choice of iodinated contrast media, prophylaxis, medication considerations, and post contrast administration management. The key changes from the 2012 guidelines were (1) Simplification of screening to a simple questionnaire, and not delaying emergent examinations due to a need for creatinine measurements (2) Prophylaxis considerations only for patients with estimated glomerular filtration rate (eGFR) less than 30 mL/min/1.73 m2 (3) Not recommending the routine discontinuation of any drugs to decrease risk of AKI, except metformin when eGFR is less than 30 mL/min/1.73 m2 and (4) Not requiring routine follow up serum creatinine measurements post iodinated contrast administration., Limitations: We did not conduct a formal systematic review or meta-analysis. We did not evaluate our specific suggestions in the clinical environment., Implications: Given the importance of iodinated contrast media use in diagnosis and management, and the low risk of AKI after contrast use, these guidelines aim to streamline the processes around iodinated contrast use in most clinical settings. As newer evidence arises that may change or add to the recommendations provided, the working group will revise these guidelines., Competing Interests: Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2022.)

This article empirically examines the extent to which the co-occurrence of the maltreatment of companion animals and intimate partner violence (IPV) previously documented in samples of women accessing services from domestic violence shelters extends to a nationally representative sample of the general Canadian population, with a specific focus on emotional and financial abuse. Using data from the intimate partner victimization module of the 2014 Canadian General Social Survey ( n = 17,950), the authors find that reporting one's intimate partner threatened or abused companion animals in the home increased the probability that one had experienced at least one form of emotional abuse or financial abuse by 38.6% ( p ≤ .001) and 7.5% ( p ≤ .001), respectively, net of several key control variables. Moreover, the findings indicate that those who identify as women are significantly more likely to report their partner emotionally or financially abused them and threatened or mistreated their pet(s); the connection between animal maltreatment and IPV is particularly pronounced for emotional IPV when compared with other forms of IPV; challenge the commonplace conceptualization of animal abuse as a form of property abuse; and suggest a need for a more nuanced understanding of IPV perpetrators vis-à-vis animal maltreatment. This is the first study to use nationally representative data to assess the co-occurrence of animal abuse and IPV, and as such, it makes significant contributions to the interdisciplinary literature on animal abuse and IPV.

This article empirically examines if the relationship between animal abuse and intimate partner violence (often referred to as "the link") documented in samples of women accessing services from domestic violence shelters extends to a nationally representative sample of the general Canadian population. Nationally representative data from the 2014 Canadian General Social Survey are analyzed using hierarchical binary logistic regression models, with threats and actual abuse of pets as a predictor of physical and sexual intimate partner violence, controlling for several key sociodemographic variables. Actual and threatened abuse of pets by a romantic partner is a significant and sizable predictor of also reporting that partner perpetrated intimate partner violence, particularly physical and severe abuse. As the first study to use nationally representative data to assess the perpetration of animal abuse and IPV in current/recent relationships, this study makes significant contributions to the interdisciplinary literature on animal abuse and IPV., (© Copyright 2021 Springer Publishing Company, LLC.)