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Natural Selections traces the history of the first four parks in Atlantic Canada through the selection, expropriation, development, and management stages. Alan MacEachern shows how the Parks Branch's preconceptions about the landscape and people of the region shaped the parks created there. In doing so he details the evolution of the park system, from the conservation movement early in the century to the rise of the ecology movement. MacEachern analyzes Parks Canada's efforts to fulfill its twin mandates of preservation and use, arguing that the agency never favoured one over the other but oscillated between more or less interventionist in ensuring both.

Predictive accuracy in wildland fire behavior is contingent on a thorough understanding of the 3D fuel distribution. However, this task is complicated by the complex nature of fuel forms and the associated constraints in sampling and quantification. In this study, twelve terrestrial laser scanning (TLS) plot scans were sampled within the mountain pine beetle-impacted forests of Jasper National Park, Canada. The TLS point clouds were delineated into eight classes, namely individual-tree stems, branches, foliage, downed woody logs, sapling stems, below-canopy branches, grass layer, and ground-surface points using a transformer-based deep learning classifier. The fine-scale 3D architecture of trees and branches was reconstructed using a quantitative structural model (QSM) based on the multi-class components from the previous step, with volume attributes extracted and analyzed at the branch, tree, and plot levels. The classification accuracy was evaluated by partially validating the results through field measurements of tree height, diameter-at-breast height (DBH), and live crown base height (LCBH). The extraction and reconstruction of 3D wood components enable advanced fuel characterization with high heterogeneity. The existence of ladder trees was found to increase the vertical overlap of volumes between tree branches and below-canopy branches from 8.4% to 10.8%.

Herbivory alters plant chemistry thereby affecting subsequent palatability for the same or different herbivore species. Balsam fir is an important food for various insect and mammalian herbivores that consume tissues at different times of year. In eastern Canada, intense selective browsing of this tree species by ungulates has impeded natural regeneration of fir-dominated forests. Our objective was to determine whether late-season (simulated) browsing of apical and lateral branches affected the defense chemistry of emerging foliage of balsam fir saplings in the following season. At each of five locations in the vicinity of Gros Morne National Park, western Newfoundland, four browsing treatments were imposed in the late growing season on healthy fir saplings; apical, lateral, apical + lateral, and no browsing. In the following season, newly expanded and previous-year needles were collected shortly after bud break and analyzed for total phenols and condensed tannins. Browsing treatments had no effect on levels of these defense chemicals in either needle age class indicating the lack of an induced chemical response or preferential defense of the apical versus lateral shoots. New foliage appeared to be better defended than previous-year foliage. Neither phenol nor tannin levels were related to canopy closure or height and diameter of saplings; however, foliar phenol concentration was positively related to soil pH for both age classes of fir needle indicating a possible relationship between soil characteristics and plant secondary metabolites. Levels of both phenols and tannins in current-year needles were positively related to those of previous-year needles, whereas the concentration of phenols and tannins were negatively related for previous-year needles only. Our results support the premise that the main antiherbivore strategy of balsam fir is tolerance of intense browsing.

This article studies the promotional publications of the Canadian National Parks Branch by examining how the ideal national park landscape was constructed in booklets. The study adds to literature that examines the shifting purposes of national parks and complements recent studies on representations of national park nature, by extending attention to Canadian park brochures, which have received little attention from scholars. Based on an examination of numerous booklets and extensive archival records on promotional publications, the article argues that rather than merely publicising the parks as they were, the Branch carefully constructed the park ideal in its booklets. This portrayal of parks drew from the parks agency's own ideas regarding the purpose of parks and from the perceived wishes of visitors and society, creating expectations of park nature but also responding to them. The park ideal portrayed in booklets transformed over time. The article illustrates how nature's place and meaning was altered in booklets to create and recreate the parks according to the needs of changing times. In examining the National Parks Branch's promotional brochures and their creation process, the article aids our understanding of the place of national parks and nature in society. It demonstrates how the parks agency redefined parks in response to its own evolving views of parks and society's wishes: changing views of what made parks useful altered their representation and the guiding themes of parks promotion shifted from usefulness and recreation to wilderness museum. Promotional literature carried certain connotations - such as national identity connected to natural landscape - throughout the period, rearticulating them to suit different times. As recent discussions on national parks in global perspective have noted, parks are part of transnational circulation of ideas, hence the Canadian experience can also be seen in a broader context.