scholarly journals Allocating species in Grime’s strategy space: an alternative to trait-based approaches

2019 ◽  
Vol 97 (4) ◽  
pp. 649-660
Author(s):  
Fernando Pedraza ◽  
Carlos Martorell

Background:  The three primary-strategy theory proposed by Grime identifies stress and disturbance as key environmental factors leading to the emergence of distinct plant strategies. These are defined by a combination of stress and disturbance tolerance. Plant strategies are usually inferred from sets of traits, but this may lead to circular reasoning and artificial restrictions to species’ distribution in strategy space.  Question: Can measurements of stress and disturbance tolerance be used to estimate the position of different species relative to each other in Grime’s strategy space? Data description: Stress, disturbance, and abundances for 50 species at 25 0.5 ha sites. Study site and dates: Semiarid grassland, Oaxaca, Mexico, 2014. Methods: Species’ tolerance to stress and disturbance were inferred from abundances, and used to allocate species in Grime’s space. We tested if some attributes of our study species changed over the strategy space according to theoretical expectations. Results: Most species were allocated towards high disturbance and low stress intensities. Species attributes were in line with the trends expected from their position in the strategy space.  Discussion: Perhaps because of a long grazing history, most species were tolerant to disturbance. The allocation of species in the strategy space using stress and disturbance measurements seemed correct based on their attributes. Thus, our measurements seem to reflect the basic principles proposed by Grime. Our method provides relative positions in the strategy space, and (as previous work) requires defining somewhat arbitrary limits to such space if we wish to label species as ruderals, competitors or stress-tolerant.  

2020 ◽  
pp. 40-44
Author(s):  
A. K. Nesterov

The article is devoted to one the most important sphere of modern American deterrence strategy — space environment. The paper presents the basic principles of US space strategy, as well as the country's main opponents in this area. Special attention is paid to the influence of space technology on the American deterrence strategy. Practical tools for implementing a containment strategy using space means are studied in detail. The author tries to forecast further ways of the development of the US military-industrial complex in the field of space and their impact on the international security system at the global and regional stage.


2010 ◽  
Vol 20 (3) ◽  
pp. 100-105 ◽  
Author(s):  
Anne K. Bothe

This article presents some streamlined and intentionally oversimplified ideas about educating future communication disorders professionals to use some of the most basic principles of evidence-based practice. Working from a popular five-step approach, modifications are suggested that may make the ideas more accessible, and therefore more useful, for university faculty, other supervisors, and future professionals in speech-language pathology, audiology, and related fields.


1996 ◽  
Vol 35 (05) ◽  
pp. 181-185 ◽  
Author(s):  
H. Herzog

SummaryThe measurement of blood flow in various organs and its visual presentation in parametric images is a major application in nuclear medicine. The purpose of this paper is to summarize the most important nuclear medicine procedures used to quantify regional blood flow. Starting with the first concepts introduced by Fick and later by Kety-Schmidt the basic principles of measuring global and regional cerebral blood are discussed and their relationships are explained. Different applications and modifications realized first in PET- and later in SPECT-studies of the brain and other organs are described. The permeability and the extraction of the different radiopharmaceuticals are considered. Finally some important instrumental implications are compared.


1976 ◽  
Vol 15 (02) ◽  
pp. 69-74
Author(s):  
M. Goldberg ◽  
B. Doyon

This paper describes a general data base management package, devoted to medical applications. SARI is a user-oriented system, able to take into account applications very different by their nature, structure, size, operating procedures and general objectives, without any specific programming. It can be used in conversational mode by users with no previous knowledge of computers, such as physicians or medical clerks.As medical data are often personal data, the privacy problem is emphasized and a satisfactory solution implemented in SARI.The basic principles of the data base and program organization are described ; specific efforts have been made in order to increase compactness and to make maintenance easy.Several medical applications are now operational with SARI. The next steps will mainly consist in the implementation of highly sophisticated functions.


2001 ◽  
pp. 91-100
Author(s):  
Yu. Ye. Reshetnikov

Last year, the anniversary of all Christianity, witnessed a number of significant events caused by a new interest in understanding the problem of the unity of the Christian Church on the turn of the millennium. Due to the confidentiality of Ukraine, some of these events have or will have an immediate impact on Christianity in Ukraine and on the whole Ukrainian society as a whole. Undoubtedly, the main event, or more enlightened in the press, is a new impetus to the unification of the UOC-KP and the UAOC. But we would like to focus on two documents relating to the problem of Christian unity, the emergence of which was almost unnoticed by the wider public. But at the same time, these documents are too important as they outline the future policy of other Christian denominations by two influential Ukrainian christian churches - the Russian Orthodox Church and the Ukrainian Greek Catholic Church. These are the "Basic Principles of the attitude of the Russian Orthodox Church to the" I ", adopted by the Anniversary Bishops' Council of the Russian Orthodox Church, and the Concept of the Ecumenical Position of the Ukrainian Greek Catholic Church, adopted by the Synod of the Bishops of the UGCC. It is clear that the theme of the second document is wider, but at the same time, ecumenism, unification is impossible without solving the problem of relations with others, which makes it possible to compare the approaches laid down in the mentioned documents to the building of relations with other Christian confessions.


2015 ◽  
pp. 147-160 ◽  
Author(s):  
S. Bobylev ◽  
N. Zubarevich ◽  
S. Solovyeva

The article emphasizes the fact that traditional socio-economic indicators do not reflect the challenges of sustainable development adequately, and this is particularly true for the widely-used GDP indicator. In this connection the elaboration of sustainable development indicators is needed, taking into account economic, social and environmental factors. For Russia, adaptation and use of concepts and basic principles of calculation methods for adjusted net savings index (World Bank) and human development index (UNDP) as integral indicators can be promising. The authors have developed the sustainable development index for Russia, which aggregates and allows taking into account balanced economic, social and environmental indicators.


2012 ◽  
pp. 152-155
Author(s):  
A. Tulokhonov

The article gives an assessment of P. A. Stolypin's political, economic and social reforms, their significance for the contemporary development of Russia, including the eastern territories. The author believes that the basic principles of the reform system proposed by Stolypin are relevant today and can become fundamental for improving the country's competitiveness.


2020 ◽  
pp. 120-139
Author(s):  
T. N. Belova

Foreign trade policy and its role in the economic growth of the national economy are considered through the prism of history and comparison of the formation of the industrial economy in the Russian Empire and the North American United States. The author compares the protectionism of D. I. Mendeleev, described in his economic works, and the free trade thinking of the American scholar W. Sumner, who formulated the “misconceptions” of protectionism. Mendeleev’s proper protectionism is grounded on the basic principles (incentivizing internal competition, growth of consumption, bringing up of new industries ), which are relevant for contemporary Russia. The author gives a typical example of the formation and decline of the factory industry using the case of mirror factories in the Ryazan province. These historical analogies, the paper argues, are necessary for the correct assessment of the current situation and for coming up with valid solutions aimed at the development of the Russian economy.


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