Restoration measures emulating natural disturbances alter beetle assemblages in boreal forest

2020 ◽  
Vol 462 ◽  
pp. 117934
Author(s):  
Ruaridh Hägglund ◽  
Mats Dynesius ◽  
Therese Löfroth ◽  
Jörgen Olsson ◽  
Jean-Michel Roberge ◽  
...  
2018 ◽  
Vol 48 (3) ◽  
pp. 302-308 ◽  
Author(s):  
Lionel Navarro ◽  
Anne-Élizabeth Harvey ◽  
Hubert Morin

Natural disturbances have a major impact on boreal forest landscape dynamics, and although fire history is well documented at the Holocene scale, spruce budworm (Choristoneura fumiferana (Clemens)) (SBW) dynamics have only been known for the last three centuries. This is likely due to the difficulty in using and interpreting existing indicators (cephalic head capsules and feces). In this methodological study, we present an original approach using lepidopteran wing scales to reconstruct insect abundance. We analyzed two sediment cores from the boreal forest in central Quebec and extracted wing scales at every stratigraphic level. The required quantity of sediment for paleoecological analysis is relatively small given the large quantity of wing scales produced by Lepidoptera and their small size. Scales are well preserved due to their chitinous structure and their great variety of shapes offer a high potential for taxonomic identification. A statistical model based on the shape of scales of the three major epidemic lepidopterans in Quebec discriminated 68% of SBW scales. This indicator allows a more efficient and more precise reconstruction of SBW history with respect to the use of cephalic head capsules or feces.


2006 ◽  
Vol 86 (Special Issue) ◽  
pp. 171-185 ◽  
Author(s):  
Cindy Shaw ◽  
Oleg Chertov ◽  
Alexander Komarov ◽  
Jagtar Bhatti ◽  
Marina Nadporozhskaya ◽  
...  

Sustainability of forest ecosystems and climate change are two critical issues for boreal forest ecosystems in Canada that require an understanding of the links and balance between productivity, soil processes and their interaction with natural and anth ropogenic disturbances. Forest ecosystem models can be used to understand and predict boreal forest ecosystem dynamics. EFIMOD 2 is an individual tree model of the forest-soil ecosystem capable of modelling nitrogen feedback to productivity in response to changes in soil moisture and temperature. It has been successfully applied in Europe, but has not been calibrated for any forest ecosystem in Canada. The objective of this study was to parameterize and validate EFIMOD 2 for jack pine in Canada. Simulated and measured results agreed for changes in tree biomass carbon and soil carbon and nitrogen with increasing stand age and across a climatic gradient from the southern to northern limits of the boreal forest. Preliminary results from scenario testing indicate that EFIMOD 2 can be successfully applied to predict the impacts of forest management practices and climate change in the absence of natural disturbances on jack pine in the boreal forest of Canada. Model development is underway to represent the effects of natural disturbances. Key words: EFIMOD 2, forest soil, carbon, nitrogen, model, jack pine


2003 ◽  
Vol 79 (3) ◽  
pp. 531-540 ◽  
Author(s):  
Pierre Drapeau ◽  
Alain Leduc ◽  
Yves Bergeron ◽  
Sylvie Gauthier ◽  
Jean-Pierre Savard

In Canada, there are still extensive tracts of boreal forest consisting of stands that have resulted from natural disturbances. The country's forests are a mosaic made up to a large extent of old-growth forest that is beyond commercial harvesting age, especially in the boreal forest of eastern Canada. As areas of boreal forest under management steadily expand, as demand for forest products continues to grow and as rotation periods become shorter in response to silvicultural practices, the forest cover will inevitably become younger, causing changes to the structure and composition of the mosaic of forest stands that will affect the aspect of entire landscapes. These changes may have an adverse impact on biological diversity. Forest birds are one group of living organisms that may respond quickly to the advent of younger forest landscapes, thereby acting as a biological indicator. In this paper, we discuss some of the problems that birds face as a result of the truncation of the age-class distribution of managed forest landscapes in eastern Canada's coniferous boreal forest, using data obtained from our research in the Clay Belt region of Quebec and Ontario. More specifically, we look at how birds respond to changes in forest structure and composition in terms of time since natural disturbances, and to variation in dead trees availability. We then consider the impact of the prospective rejuvenation of the forest cover in managed forest landscapes, and possible solutions aimed at mitigating that impact through new management strategies based on the maintenance of forest ecosystem diversity. The ability of these new management strategies to maintain the ecological integrity of bird communities provides an indication of their potential as tools for contributing to the maintenance of biological diversity in a broader sense. Key words: bird communities, old black spruce forests, natural landscape age structure, stand structure, dead wood, multicohort management


2007 ◽  
Vol 83 (4) ◽  
pp. 539-556 ◽  
Author(s):  
Michael A Wulder ◽  
Celina Campbell ◽  
Joanne C White ◽  
Mike Flannigan ◽  
Ian D Campbell

Boreal forest nations are often thought to have similar environmental, social, and economic contexts. In this communication we show that boreal forest nations are a disparate grouping, with some similarities and many differences. Highlighting these differing national contexts provides insights into how a given nation utilizes the boreal forests over which it holds stewardship responsibilities. Current national contexts are related to each nation's physiography, climate, history, legacy of past forest management, the timing of transition from natural to plantation forests, population density and distribution, and access to resources and markets. Boreal forests are dominated by pioneer species that are resilient to disturbance and have a demonstrated ability to adapt to past climate changes. National responses to natural disturbances are linked to forest area, ownership, and management intensity. Boreal forests in large nations (e.g., Canada, Russian Federation) are typically publicly owned, and disturbances such as fire are allowed to progress naturally over remote areas. In smaller nations, where there is often a greater proportion of private ownership and a focus on production forestry, natural disturbances are more aggressively controlled (e.g., Sweden, Finland). Large nations with low boreal human population densities have a greater proportion of natural boreal forest, with relatively higher levels of biodiversity when compared to the fully managed forests of some smaller boreal nations. In smaller nations, the combination of limited forest area and private ownership has facilitated the dominance of intensive sustainable forestry management practices (e.g., Finland). Conversely, in nations with more spatially extensive forest assets that are publicly owned and managed to meet multiple objectives, extensive sustainable forest management practices dominate (e.g., Canada, Russian Federation). Key words: boreal forest, global, national circumstances, environmental, social, economic, forestry practices, Canada


1996 ◽  
Vol 72 (1) ◽  
pp. 59-62 ◽  
Author(s):  
D. A. Haggstrom ◽  
D. G. Kelleyhouse

Wildlife diversity and abundance are directly tied to the ever changing nature of the boreal forest. Wildland fire and fluvial action have been primarily responsible for maintaining diversity and productivity. However, there is an increasing need to protect people, human developments and a forest base for timber harvest from natural disturbances. Differences between logging, prescribed fire and wildland fire, and their effects on wildlife are discussed. We also discuss the value of riparian and late successional forest types within the boreal forest, our concerns for proposals that seek to optimize timber harvests for large areas, and some professional, political, economic and biological challenges facing managers who attempt to supplement or supplant natural processes with silvicultural practices. We conclude by urging forest managers to make decisions carefully, based on the best environmental science available, with full public and agency involvement, and with the understanding that there is still much to be learned about the boreal forest ecosystem. Key words: boreal forest, wildlife, wildland fire, clearcut logging, old growth


2008 ◽  
Vol 141 (3) ◽  
pp. 815-826 ◽  
Author(s):  
Annie Webb ◽  
Christopher M. Buddle ◽  
Pierre Drapeau ◽  
Michel Saint-Germain

2017 ◽  
Vol 12 (2) ◽  
Author(s):  
J. Ryan Zimmerling ◽  
Charles M. Francis ◽  
Christian Roy ◽  
Anna M. Calvert

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