Fisheries and Fundamental Science: Donald Rawson's Studies of Lake Productivity

Between 1930 and 1960 Donald Rawson was the leading limnologist in Western Canada. His work in the Fisheries Laboratory of the University of Saskatchewan between 1948 and 1960 is of particular interest. Through his surveys of lakes in his province he was able to contribute to development of theoretical concepts of lake productivity, while providing results useful to the provincial fisheries management agency.Entre 1930 et 1960 Donald Rawson était le plus grand limnologue de l’ouest du Canada. Ses travaux au laboratoire des pêcheries de l’Université de la Saskatchewan entre 1948 et 1960 ont été d’un intérêt tout particulier. Ses analyses des lacs de la province lui ont permis de contribuer au développement des concepts théoriques sur la productivité lacustre tout en fournissant des données utiles à l’agence de gestion des pêcheries de la province

Modeling the effect of copper availability on bacterial denitrification

When denitrifying bacteria such as Paracoccus denitrificans respire anaerobically they convert nitrate to dinitrogen gas via a pathway which includes the potent greenhouse gas, nitrous oxide (NO). The copper-dependent enzyme Nitrous Oxide reductase (Nos) catalyzes the reduction of NO to dinitrogen. In low-copper conditions, recent experiments in chemostats have demonstrated that Nos efficiency decreases resulting in significant NO emissions. For the first time, a chemostat-based mathematical model is developed that describes the anaerobic denitrification pathway based on Michaelis-Menten kinetics and published kinetic parameters. The model predicts steady-state enzyme levels from experimental data. For low copper concentrations, the predicted Nos level is significantly reduced, whereas the levels for the non copper-dependent reductases in the pathway remain relatively unaffected. The model provides time courses for the pathway metabolites that accurately reflect previously published experimental data. In the absence of experimental data purely predictive analyses can also be readily performed by calculating the relative Nos level directly from the copper concentration. Here, the model quantitatively estimates the increasing level of emitted NO as the copper level decreases. We have developed a mathematical model for the denitrification pathway based on existing experimental results, Michaelis-Menten kinetics and experimentally obtained kinetic constants. This is the first such model to incorporate the copper concentration in order to predict emissions of the potent greenhouse gas, nitrous oxide (NO), as well as the other nitrogenous compounds in the pathway. The model predicts increasing NO emissions as the copper level is lowered, in agreement with experimental observations in chemostats. © 2013 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.

Youth against hunger: service, activism and the mobilisation of young humanitarians in 1960s Britain

Youth have been a malleable resource in the fight against hunger, variously conceived as volunteers, political activists, global citizens and financial donors. This article uncovers competing (and sometimes complementary) visions for the participation of British youth in Youth Against Hunger, part of the United Nations Freedom from Hunger Campaign. In doing so, it makes two key contributions to the field. First, by uncovering the professionals and commentators who sought to involve adolescents in humanitarian activity, it accounts for the agency of a more diverse range of non-state participants and experts than are usually included in histories of humanitarianism. Second, in highlighting the pragmatic difficulties in aligning humanitarian and youth-work contexts, it illustrates how domestic concerns about British youth actively shaped the development of the humanitarian sector in this period

Evidence-based Decision-making in Canada’s Protected Areas Organizations: Implications for Management Effectiveness

Aichi Biodiversity Target 19 calls on Parties to the United Nations Convention on Biological Diversity (CBD) to improve, share, transfer, and apply knowledge. In this study, we provide an initial assessment of the state of evidence-based decision-making in Canada’s protected areas organizations by examining (1) the value and use of various forms of evidence by managers and (2) the extent to which institutional conditions enable or inhibit the use of evidence in decision-making. Results revealed that although managers value and use many forms of evidence in their decision-making, information produced by staff and their organizations are given priority. Other forms of evidence, such as Indigenous knowledge and peer-reviewed information, are valued and used less. The most significant barriers to evidence-based decision-making were limited financial resources, lack of staff, inadequate timeframes for decision-making, a lack of monitoring programs, and a disconnect between researchers and decision-makers. Overall, our results suggest that the potential benefits of evidence-based approaches are not being maximized in Canada’s protected areas organizations. We propose several recommendations to introduce or improve the use of diverse forms of evidence to enhance management effectiveness of Canada’s protected areas and by extension conservation outcomes

Representing Sikhism: Essays in memory of the Irish scholar Max Arthur Macauliffe

This is an introduction, by the guest editors, to the special issue of JISASR (Vol 4, 2017) entitled 'Representing Sikhism: Essays in Memory of the Irish Scholar Max Arthur Macauliffe'. The genesis of this special issue lies in pioneering work on Macauliffe's Irish identity and personal and scholarly life undertaken by Professor Tadhg Foley (Galway). The active interest and support of members of the Sikh community in Ireland led to a conference, hosted by the Study of Religions Department at University College Cork, held to mark the centennial of Macauliffe's death on 15 March 1913. After some brief comments on past and present trends in the study of Ireland-Asia connections in the field of religions, we discuss Macauliffe's significance for modern representations of Sikhism and offer some contextual observations on each of the four papers. The article concludes with a brief resumé of the 2013 conference at which the papers were originally presented