A retrospective look at 80 years of silvicultural research at Petawawa

1999 ◽  
Vol 75 (3) ◽  
pp. 385-388
Author(s):  
Steve D'Eon

Canada's oldest forest research plot was laid out at Petawawa in 1918. Since then, hundreds of researchers have established plots, gathered data, and published results utilizing the Petawawa Research Forest. Many of the projects and plots were designed as long-term studies meant to endure and be re-measured over the decades. Although control plots were utilized, these early experiments were established prior to the benefits of repetition and experimental design. Later experiments were installed with three or more reps and factorial designs strengthening their analytical capabilities. Research priorities have shifted over time from documenting the results of a particular silvicultural treatment to understanding why silvicultural responses are obtained. Factors that influenced the continuance of some studies and the discarding of others are reviewed.Some studies achieved their original goals and have been continued for longer periods or utilized for additional goals. Characteristics such as tenure, experimental design, and site characteristics are described for several of these studies. Key words: long-term research, permanent sample plots, Petawawa

1970 ◽  
Vol 16 (2) ◽  
pp. 3-11 ◽  
Author(s):  
H Meilby ◽  
L Puri ◽  
M Christensen ◽  
S Rayamajhi

To monitor the development of four community-managed forests, networks of permanent sample plots were established in 2005 at sites in Chitwan, Kaski and Mustang Districts, Nepal. This research note documents the procedures used when preparing for establishment of the plot networks, evaluates the applied stratification of the forest on the basis of data gathered in pilot surveys conducted in the early 2005, and provides a discussion on the implications of the choices made. Key words: Community-managed forests; permanent sample plots; stratification; allocation; estimates Banko Janakari Vol.16(2) 2006 pp.3-11


2006 ◽  
Vol 189 (5) ◽  
pp. 399-404 ◽  
Author(s):  
Anja Busse ◽  
Matthias C. Angermeyer ◽  
Steffi G. Riedel-Heller

BackgroundStudies of conversion from mild cognitive impairment to dementia suggest a linear progression over time. Conversion rates during lifetime may extend to 80–90%.AimsThis study examines the time-dependent evolution from mild cognitive impairment to dementia. Current assumptions regarding yearly and lifetime conversion rates are challenged.MethodA community sample of 1045 dementia-free individuals aged 75 years and over was examined by neuropsychological testing based on 6 years of observation.ResultsApproximately 60–65% of people with mild cognitive impairment develop clinical dementia during their life. Progression from mild cognitive impairment to dementia appears to be time dependent, occurring primarily within the initial 18 months.ConclusionsFurther long-term studies are needed to examine the time-dependent evolution from mild cognitive impairment to dementia and to establish age-specific conversion rates during lifetime.


2007 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Juan Carlos Faller-Menéndez ◽  
Luis A. Lago-Torres ◽  
Alfonsina Hernández-Cardona ◽  
Mederic Calleja-Alvarado ◽  
Gerardo Ceballos González ◽  
...  

Resumen: En noviembre de 2006 se utilizó un prototipo de cámara de video, en la reserva privada El Zapotal, en la porción noreste de la Península de Yucatán, y obtuvimos la filmación de una pareja de jaguares en actitud de apareamiento. Esta filmación representa una de las primeras experiencias de su tipo, y ha proporcionado información única sobre comportamiento y fecha de apareamiento de jaguares libres, que es consistente con algunos resultados de investigaciones de amplio espectro y largo plazo sobre poblaciones de esta especie en Sudamérica. Palabras clave: Apareamiento, Panthera onca, videofilmación, Yucatán Abstract: In november 2006, using a prototype of video camera, we obtained the shooting of a pair of jaguars in mating attitude. This was done in the El Zapotal private reserve, in the northeastern portion of the Yucatan Peninsula, and represents one of the first experiences of its type, also providing unique information about the mating behavior and the date of occurrence. The latter is consistent with some results derived from wide spectrum, long term studies about jaguar populations in South America. Key words: Mating, Panthera onca, videoshooting, Yucatan


2015 ◽  
Vol 62 (1) ◽  
pp. 26-38 ◽  
Author(s):  
Andres Kiviste ◽  
Maris Hordo ◽  
Ahto Kangur ◽  
Anton Kardakov ◽  
Diana Laarmann ◽  
...  

Abstract Forest research has long traditions in Estonia that can be traced back to the 19th century. Data from long-term forest experiments are available since 1921. The first studies mainly focused on silvicultural treatments and application of such data for understanding and modeling ecological processes was limited. The Department of Forest Management of the Estonian University of Life Sciences started to develop the Estonian Network of Forest Research Plots (ENFRP) in 1995. Since then, plots have been continuously re-measured with 5-year interval. Approximately 100-150 permanent sample plots were measured annually. In 2014, the long-term research network consisted of 729 permanent sample plots, of which 699 have been re-measured at least once, 667 plots - twice and 367 plots - three times. The total number of trees recorded in the network database amounts to 130,479. The plots are systematically distributed throughout the country. Detailed dendrometric measurements including tree spatial distribution are part of the survey protocol. Initially the network was set up to produce suitable data for development of individual tree growth models for Estonia. The significance of the network for the Estonian forest research is continuously increasing and nowadays ENFRP is recognized as an important national research infrastructure.


2021 ◽  
pp. jrheum.210476
Author(s):  
Jeremy Holyera ◽  
Andrea Garcia-Guillena ◽  
William J Taylorb ◽  
Angelo L. Gaffoc ◽  
Merryn Gotta ◽  
...  

Objective The patient experience of gout flares is multidimensional with several contributing factors, including pain intensity, duration and frequency. There is currently no consistent method for reporting gout flare burden in long-term studies. This study aimed to determine which factors contribute to patient perceptions of treatment efficacy in long-term studies of gout flare prevention. Methods This study involved face-to-face interviews with people with gout using visual representations of gout flare patterns. Participants were shown different flare scenarios over a hypothetical 6-month treatment period portraying varying flare frequency, pain intensity and flare duration. The participants were asked to indicate and discuss which scenario they believed was most indicative of successful treatment over time. Quantitative data relating to the proportion of participants selecting each scenario were reported using descriptive statistics. A qualitative descriptive approach was used to code and categorize the data from the interview transcripts. Results Twenty-two people with gout participated in the semi-structured interviews. All three factors of pain intensity, flare duration and flare frequency influenced participants' perception of treatment efficacy. However, a shorter flare duration was the most common indicator of successful treatment, with half of participants (n = 11, 50%) selecting the scenario with a shorter flare duration over those with less painful flares. Conclusion Flare duration, flare frequency, and pain severity are all considered by patients with gout when considering treatment efficacy over time. Long term studies of gout should ideally capture all of these factors to better represent patients' experience of treatment success.


1978 ◽  
Vol 35 (3) ◽  
pp. 336-338 ◽  
Author(s):  
L. A. Hanic ◽  
J. D. Pringle

A method is described employing a primary pottery unit for seeding and growing Chondrus crispus Stackhouse and a secondary concrete platform for support and protection. The combined units facilitate long-term studies where frequent removal of plants for observation is required and where field conditions are adverse. Key words: Chondrus crispus, Irish moss, seeding, outplanting method


1994 ◽  
Vol 70 (1) ◽  
pp. 84-87 ◽  

The Forestry Research Advisory Council of Canada in cooperation with provincial and territorial forest research advisory committees has prepared this fifth annual review of forest research priorities for the Canadian Council of Forest Ministers.The top five priorities from each committee were scored from 5 points for highest priority down to 1 point for lowest. The resulting 11 research topics in descending order of priority are:1. Integrated forest landscape management systems and decision support.2. Inventory, growth and yield, ecological site classification.3. Ecosystem functioning, soil and biodiversity conservation.4. Pest and weed management and alternatives to chemicals.5. Ecological effects of natural and human-caused disturbances.6. Lower-cost silviculture and harvesting, natural regeneration.7. Forest fire management and control.8. Socio-economic knowledge and resolution of resource use conflicts.9. Mixedwood management.10. Incentives for private investment.11. Planting stock quality and tree improvement.Eight issues likely to affect future research priorities were identified by more than one respondent, as follows:1. Global trade, competition, and world public opinion.2. Concern and input about sustainable forestry and the environment.3. Public participation.4. New policies on forestry, tenure, sales, and forest protection.5. Lack of long-term research funding, communication, and coordination.6. Shortage of fiber, long-term viability of the industry.7. Land claims and forestry on aboriginal lands.8. Increasing need for information at all levels.Other concerns include climate change, government debt, population growth and shifts, and protected and old-growth forests.Discussion of these priorities and issues at a meeting of FRACC and representatives from the provincial and territorial committees produced some general conclusions, as outlined below.To resolve resource use conflicts and to manage forests sustainably for all benefits, managers need better information that only research can provide. The goal is management systems that produce a blend of outputs from the forest and maintain the diversity and mosaic structure of naturalforest ecosystems. This kind of forestry will meet the desires of most Canadians and go far to restore public confidence in forest management.In short, research must provide additional knowledge to enable forest managers to:• Sustain the diversity and resilience of the forest ecosystems.• Improve forest health and resistance to pests.• Increase forest productivity for all values.• Reduce forest management and fire protection costs.• Access all available knowledge and data in making decisions.• Determine the socio-economic value of Canadian forests.• Improve profits and competitiveness in the forest industry.Many feel that forestry research in Canada is quite well focused on these questions, but more effort is required to ensure sufficient long-term funding and to improve local application of research results.The usefulness of this annual survey of research priorities was reviewed. It was concluded that the annual meeting of FRACC with representatives of provincial and territorial research advisory committees and the annual presentation to CCFM are very useful. However, a survey of priorities every year is, in the light of experience, unnecessary. A biennial review of priorities is recommended, with presentation to CCFM and subsequent publication. In the alternate years, a workshop of FRACC and provincial and territorial committee representatives is suggested, which would examine a major research topic in depth and present the results and conclusions to CCFM. A report could be published if appropriate.


2018 ◽  
Vol 10 (15) ◽  
pp. 12969-12978
Author(s):  
Subrat Debata ◽  
Kedar Kumar Swain

A study was carried out to assess the Odonata fauna of Kuldiha Wildlife Sanctuary, Odisha, eastern India from November 2012 to October 2013.  During the study a total of 54 species of odonates including 37 species of dragonflies (Anisoptera) and 17 species of damselflies (Zygoptera) were recorded.  Among the dragonflies, the family Libellulidae was well represented with 30 species whereas among the damselflies, Coenagrionidae was well represented with seven species.  Overall, the odonate fauna of Kuldiha Wildlife Sanctuary accounted for 49.09% of the odonate species known from Odisha and 10.73% of India.  Therefore, further long-term studies on these lesser-known insect fauna in Kuldiha Wildlife Sanctuary will be useful in understanding their status over time.


1994 ◽  
Vol 70 (4) ◽  
pp. 455-460

The Forest Accord that flowed from the Forest Congress of March 1992 carries firm commitments to "maintain and enhance the long term health of our forest ecosystems, for the benefit of all living things both nationally and globally." It recognizes forestry research as vital in attaining this goal.The Forestry Research Advisory Council of Canada (FRACC) has provided advice on forestry research priorities and policies to the Canadian Forest Service (CFS) since 1983. The Council is much encouraged by the Accord's strong emphasis on research.As a result of the 1987 decision by the Canadian Council of Forest Ministers (CCFM), forest research advisory councils (FRACs) are now functioning in most provinces. FRACC works closely with these groups and for the past five years, with their assistance, has prepared an annual overview of forestry research priorities and concerns across Canada. Over the past year, the Council has reviewed its role and its working arrangements with the FRACs.In this 1993 report, Council makes the following recommendations:Recommendation 1. CFS research programs to improve and foster sustainable forest management should be aimed at maintaining viable, diverse forest ecosystems using techniques that mimic natural processes as much as possible, to produce an appropriate mix of values.Recommendation 2. The CFS should complete the update of the forestry research inventory and then give attention to further refining the software system. In particular, it should be made more flexible and adapted to manipulation by existing commercially available software.Recommendation 3. All agencies concerned with Canadian forest research should be urged to discuss and study the report Toward a National Forest Science and Technology Agenda for Canada.Recommendation 4. The CFS should strongly support the concept of alternating annual activities. An overview of research priorities could be conducted in odd-numbered years; then in even-numbered years, FRACC and representatives of the provincial and territorial councils could hold a workshop to examine a major research topic in depth and present the results and conclusions to the CCFM.Recommendation 5. The CFS should ensure that sufficient funding is available to cover at least three meetings of Council each year. It should also make a reasonable amount of staff time or contract funds available to Council for the conduct of analysis and studies.Recommendation 6. The CFS should review Council's terms of reference, and give direction on whether Council should make recommendations that go beyond the research programs of the CFS, and whether it should include forest products research in its examination of issues and priorities.The funding of forest research is a matter of serious concern, particularly the need to provide stable, long-term funding, because forest research is, by its nature, long term. No specific recommendations were prepared in 1993 but Council will continue to give this question close attention in 1994.Forest research priorities across the country were again assessed in cooperation with the provincial and territorial FRACs. It was agreed that forest research must be targeted to enable forest managers to:• Sustain the diversity and resilience of the forest ecosystems.• Improve forest health and resistance to pests.• Increase forest productivity for all values.• Reduce forest management and fire protection costs.• Access all available knowledge and data in making decisions.• Determine the socio-economic value of Canadian forests.• Improve profits and competitiveness in the forest industry.Forest research in Canada is considered to be reasonably well focused on these questions, but more effort is required to ensure long-term funding and to improve application of results.Council will hold three regular meetings in 1994. During the year it will give attention to:1. Global trends affecting forestry — including five or six major issues requiring research attention, and the implications they all have for forest research priorities.2. Progress of the forest research inventory.3. Development of a proposal for research coordination and support, as requested by the Forest Sector Advisory Council.4. How research is categorized, performed, and funded in Canada — to provide information useful in further improving the ongoing forest research inventory, and as a basis for the proposal on research funding being considered by Council.


2017 ◽  
Vol 5 ◽  
pp. 49-56
Author(s):  
D.C. Devkota ◽  
K.R. Gosai ◽  
D. Devkota

Nepal’s economy is largely based on agriculture, predominantly small-scale farming, and about half of which is dependent on natural rainfall. In Nepal, agriculture is a highly climate sensitive sector. Historically, the sector has been affected by floods, droughts and erratic rainfall. This study focused on the impacts and economic costs of climate change in agriculture and assessed perceptions of communities of Kaski and Mustang districts on frequency and intensity of hailstorm events over time including their related impacts. Scenario-based impact assessment was used for assessment of long-term impacts and economic costs of climate change. The study used Decision Support System for Agro-technology Transfer (DSSAT) model to analyze the effects of climate on three major crops, namely rice, maize and wheat. The economic loss due to the impacts of climate change in cereals (rice, maize and wheat) was estimated at around US$ 336.42 million in the year 2006. Among the respondents, 60% reported food shortages which made them highly vulnerable due to climate variability. Similarly, 80% of the respondents mentioned that 20 major hailstorm events have occurred in the vicinity of their communities over the last 35 years (up to 2012) and have caused significant damage to crop production, livestock and infrastructure. DesInventar database reported damage of 75% to 100% of the key crops. Crop yield projections indicate a complex mix of increases and decreases in yield which vary over time (in projections in 2030 AD and 2070 AD) and by location (east to west/Terai to Mountains). In the 2030s, there is a net increase in production and values; however, by the 2070s, the impact in agricultural production is expected to reach to US$ 140 million/year (2014). In terms of research, there are priorities around further work to understand climate uncertainty, the indirect economic costs of these impacts, and early research priorities to address long-term challenges. There is an urgent need to build capacity, with information and awareness raising, monitoring, research, and institutional strengthening.


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