Darwin's naturalization hypothesis predicts that introduced species tend not to invade areas containing congeneric native species, because they would otherwise compete with their close relatives and would likely encounter predators and pathogens that can attack them. An opposing view is that introduced species should succeed in areas where native congeners are present because they are more likely to share traits that pre-adapt them to their new environment. A test of both these hypotheses using data on fish introductions from several independent regions fails to support either viewpoints. In contrast to studies of nonindigenous plants, our results suggest that taxonomic affiliation is not an important general predictor of fish invasion success.

Symptom management and end-of-life care are core skills for all physicians, although in ordinary times many anesthesiologists have fewer occasions to use these skills. The current coronavirus disease (COVID-19) pandemic has caused significant mortality over a short time and has necessitated an increase in provision of both critical care and palliative care. For anesthesiologists deployed to units caring for patients with COVID-19, this narrative review provides guidance on conducting goals of care discussions, withdrawing life-sustaining measures, and managing distressing symptoms.

To the Editor, The Canadian Anesthesiologists' Society (CAS) Honour Award recipients for 2018 were announced on 8 March, International Women's Day. The recipients are all extremely deserving of recognition and they all have a clear history of impressive accomplishments. They all have something else in common: their gender. Each award recipient is a man. Upon closer inspection of past Honour Award recipients, it becomes clear that an overwhelming majority of the recipients have been men. The Research Recognition award has been handed out 25 times and has been won by five (20%) women. A woman has won the Clinical Teacher award four (24%) times in 17 years. The John Bradley Young Educator Award, awarded 12 times since its inception, has never been won by a woman. The Clinical Practitioner Award has been given out 13 times, also never once to a woman. The CAS's prestigious Gold Medal, given in recognition of excellence in matters related to anesthesia, has been given to only four (7%) women in the 54 times since it was first awarded in 1962. That said, since the award was first given to a woman (Dr. Angela Enright) in 2003, four (20%) women have received the Gold Medal. Are these numbers representative of the current gender distribution of anesthesiologists in Canada? They are not. In 2016, 32% of practicing anesthesiologists 1 and 40% of