Listening carefully: increased perceptual acuity for species discrimination in multispecies signalling assemblages

Communication is a fundamental component of evolutionary change because of its role in mate choice and sexual selection. Acoustic signals are a vital element of animal communication and sympatric species may use private frequency bands to facilitate intraspecific communication and identification of conspecifics (acoustic communication hypothesis, ACH). If so, animals should show increasing rates of misclassification with increasing overlap in frequency between their own calls and those used by sympatric heterospecifics. We tested this on the echolocation of the horseshoe bat, Rhinolophus capensis, using a classical habituation-dishabituation experiment in which we exposed R. capensis from two phonetic populations to echolocation calls of sympatric and allopatric horseshoe bat species (Rhinolophus clivosus and Rhinolophus damarensis) and different phonetic populations of R. capensis. As predicted by the ACH, R. capensis from both test populations were able to discriminate between their own calls and calls of the respective sympatric horseshoe bat species. However, only bats from one test population were able to discriminate between calls of allopatric heterospecifics and their own population when both were using the same frequency. The local acoustic signalling assemblages (ensemble of signals from sympatric conspecifics and heterospecifics) of the two populations differed in complexity as a result of contact with other phonetic populations and sympatric heterospecifics. We therefore propose that a hierarchy of discrimination ability has evolved within the same species. Frequency alone may be sufficient to assess species membership in relatively simple acoustic assemblages but the ability to use additional acoustic cues may have evolved in more complex acoustic assemblages to circumvent misidentifications as a result of the use of overlapping signals. When the acoustic signal design is under strong constraints as a result of dual functions and the available acoustic space is limited because of co-occurring species, species discrimination is mediated through improved sensory acuity in the receiver

The drug war must end: The right to life, liberty and security of the person during the COVID-19 pandemic for people who use drugs

Since the start of the opioid epidemic in 2016, the Downtown Eastside community of Vancouver, Canada, has lost many pioneering leaders, activists and visionaries to the war on drugs. The Vancouver Area Network of Drug Users (VANDU), the Western Aboriginal Harm Reduction Society (WAHRS), and the British Columbia Association People on Opiate Maintenance (BCAPOM) are truly concerned about the increasing overdose deaths that have continued since 2016 and have been exacerbated by the novel coronavirus (SARS-COVID-19) despite many unique and timely harm reduction announcements by the British Columbia (B.C.) government. Some of these unique interventions in B.C., although in many cases only mere announcements with limited scope, are based on the philosophy of safe supply to illegal street drugs. Despite all the efforts during the pandemic, overdose deaths have spiked by over 100% compared to the previous year. Therefore, we urge the Canadian federal government, specifically the Honorable Patty Hajdu, the federal Minister of Health, to decriminalize simple possession immediately by granting exemption under the Controlled Drugs and Substances Act. The Canadian federal government has a moral obligation under Sect. 7 of the Canadian Charter of Rights and Freedoms to protect the basic human rights of marginalized Canadians.Dentistry, Faculty ofNon UBCReviewedFacult

The role of medical students’ training and community placement as a tool to enhance medical education in Canada

We are currently witnessing unprecedented crises on an international scale linked to synthetic opioid overdose fatalities. While most governments and health policy makers have focused mainly on combating the current crises through harm reduction strategies, little focus has been given to the role and training of future doctors in evidence-based practices of harm reduction and addiction medicine. Therefore, enhancing medical student’s training in the implementation of addiction medicine, and the establishment (or expansion) of medical students, residents and post-fellows’ community placement—via partnerships with organizations that provide specialized care to patients struggling with mental health and addiction—would strongly improve the health and well-being of marginalized populations.Medicine, Faculty ofOther UBCNon UBCPopulation and Public Health (SPPH), School ofReviewedPostdoctoralOthe

The lessons learned from the fentanyl overdose crises in British Columbia, Canada

Medicine, Faculty ofOther UBCNon UBCPopulation and Public Health (SPPH), School ofReviewedPostdoctoralOthe

The synthetic opioid epidemic and the need for mental health support for first responders who intervene in overdose cases.

Medicine, Faculty ofOther UBCNon UBCPopulation and Public Health (SPPH), School ofReviewedPostdoctoralOthe

Access to oral care is a human rights issue: a community action report from the Downtown Eastside of Vancouver, Canada

To offer a critical reflection on an impoverished neighborhood in Vancouver, Canada, and their access to oral health care. A review of how a lack of publicly funded oral health care affects the most vulnerable, uninsured, and underserved citizens is performed. Personal and professional accounts on how entrepreneurial innovations of not-for-profit organizations can help to close the gap in access to oral health care are offered using the Vancouver Area Network of drug users (VANDU) and the PHS Community Services Society as case studies in British Columbia. Despite the efforts put forward by not-for-profit organizations such as the VANDU and the PHS Community Services Society, a national oral health care plan is warranted though still not a political imperative. Underserved citizens have a right to oral health care that is compassionate, collaborative, accessible, and affordable.Dentistry, Faculty ofNon UBCReviewedFacultyOthe