Analyse de la variabilité morphologique chez huit populations spontanées de Pistacia atlantica en Algérie

Botany ◽  
2008 ◽  
Vol 86 (5) ◽  
pp. 520-532 ◽  
Author(s):  
Safia Belhadj ◽  
Arezki Derridj ◽  
Yves Auda ◽  
Charles Gers ◽  
Thierry Gauquelin
Keyword(s):  
Multivariate Analysis ◽  
Comparative Analysis ◽  
Morphological Traits ◽  
Morphological Variability ◽  
Climatic Conditions ◽  
Terminal Leaflet ◽  
Fruit Colour ◽  
Wild Populations ◽  
Physiological Mechanisms ◽  
Pistacia Atlantica

To study the morphological variability within and among Pistacia atlantica Desf. populations, a comparative analysis was undertaken in eight wild populations grown under different climatic conditions in Algeria. This study addresses the morpho-biometrical aspect of the leaves and the fruits, as well as the micromorphological aspect of leaves. ANOVA as well as mean comparison of the morphological traits revealed a significant diversity within and among the populations. Furthermore, in the multivariate analysis, the populations were separated into four different groups through the discriminating variables: leaf and leaflet dimensions, number of pairs of leaflets, leaf wings, leaf smell and colour, terminal leaflet size and apex, and finally fruit colour and shape. These results showed the originality of the Algerian populations as compared with those commonly described for this species in the literature, in particular by the occurrence of wax on the leaves. The morphological variability exhibited by the Algerian populations of P. atlantica may be interpreted as relevant to the ecological plasticity and the physiological mechanisms discussed in this article.

scholarly journals Comparative analysis of populations of the Balkan endemic species Daphne malyana Blecic (Thymeleaceae)

2010 ◽  
Vol 62 (4) ◽  
pp. 1151-1162 ◽  
Author(s):  
Marina Juskovic ◽  
P. Vasiljevic ◽  
V. Randjelovic ◽  
V. Stevanovic ◽  
Branka Stevanovic
Keyword(s):  
Principal Component Analysis ◽  
Comparative Analysis ◽  
Endemic Species ◽  
Morphological Variability ◽  
Principal Component ◽  
Balkan Peninsula ◽  
Canonical Discriminant Analysis ◽  
The Other ◽  
Isolated Populations ◽  
Microclimate Conditions

Daphne malyana Blecic (Thymeleaceae) is an endemic species of the western part of the Balkan Peninsula, distributed in the mountains, canyons and gorges of N. Montenegro, E. Bosnia and W. Serbia. The comparative morphoanatomic investigations have included four distantly separated populations of the species D. malyana, i.e. two from Serbia, from the ravines of Sokoline and Vranjak on Mt. Tara, and two from Montenegro, in the canyons of the Tara and Piva rivers. Comparative morphoanatomical studies have shown the presence of general adaptive characteristics of a specific, conservative xeromorphic type, slightly differing in each population. Principal component analysis (PCA) and canonical discriminant analysis (CDA) of 20 morphoanatomical characteristics of the leaves and stems have shown a clear distinction between the populations from the river Piva canyon (Montenegro) and those from the Sokoline ravine (Serbia), on one side, and those of Vranjak gorge (Serbia) and of the river Tara canyon (Montenegro) on the other side. It may be assumed that the mild morphological variability of the isolated populations of the Balkan endemic species D. malyana in the canyons and gorges seem to have been affected by the microclimate conditions in their habitats.

scholarly journals Non-Metric Dental Traits in Human Skeletal Remains from Transcaucasian Populations: Phylogenetic and Diachronic Evidence

2014 ◽  
Vol 77 (2) ◽  
pp. 151-174 ◽  
Author(s):  
Anahit Yu. Khudaverdyan
Keyword(s):  
Comparative Analysis ◽  
Morphological Traits ◽  
Skeletal Remains ◽  
Biocultural Diversity ◽  
Human Populations ◽  
Biological Distance ◽  
Human Skeletal Remains ◽  
Observer Error ◽  
Dental Traits ◽  
Armenian Highland

Abstract The aim of the study is the assessment of biological distance between populations from Transcaucasia on the basis of the frequency of dental morphological traits. It is well known that these traits are characterised by a high inter-population differentiation, low sexual dimorphism, and their recording is loaded by relatively small intra and inter observer error. The dental morphological traits are successfully used in the description and explanation of the microevolutionary and ethnogenetic processes. This paper presents the results of the odontological differentiation of human populations from Transcaucasia. The comparative analysis was carried out on the basis of 12 groups. From the obtained results, we can draw the following conclusions: The populations of Armenian Highland and Georgia can be differentiated as far as the frequency of dental morphological traits are concerned. They also do not exhibit similar intragroup variability. Biocultural diversity of ancient Transcaucasian populations has not been studied extensively; therefore, delineating some of the patterns of phenotypic variation may be useful for understanding their ongoing evolution.

THE DIRECTIONS FOR OPTIMIZING UKRAINE’S EXPORT POTENTIAL OF GRAIN CROPS IN THE CONTEXT OF CHANGING CLIMATIC CONDITIONS

2021 ◽  
Vol 14(63) (1) ◽  
pp. 129-136
Author(s):  
Kateryna VASYLKOVSKA ◽  
Oleksii VASYLKOVSKYI ◽  
Svitlana POPOVA ◽  
Valentyna Malakhovska
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Comparative Analysis ◽  
Qualitative Change ◽  
Climatic Conditions ◽  
Agricultural Producers ◽  
Grain Crops ◽  
New Challenges

"The production and yield of grain crops in Ukraine from 2000 to 2019 was analysed in the article. The comparative analysis of gross harvest and export of grain during these years was carried out and the dependence of exports on gross harvest and its share was determined. The results point out that the export of grain crops has increased over the years under research, which indicates Ukraine’s significant export potential. Thus, leaving for the needs of the country from 16.0 to 36.6 million tons of grain (on average, 25.9 million tons), Ukrainian farmers export an average of 40.7% of the crop. During the period from 2000 to 2019, the gross harvest of grains in the country averaged 48.4 million tons resulting in the annual potential share of exports of at least 22.4 million tons. It was also found that the increase in the share of exports was made possible by a qualitative change in yield, which was due to the changes in crop growing technology. However, with global warming and climate change, new challenges for agricultural producers are emerging. The recommendations were given in order to improve the crop growing technology that will allow to overcome these challenges, further increase yields and Ukraine's export potential. "

scholarly journals Flat Glass or Crystal Dome Aperture? A Year-Long Comparative Analysis of the Performance of Light Pipes in Real Residential Settings and Climatic Conditions

2020 ◽  
Vol 12 (9) ◽  
pp. 3858 ◽  
Author(s):  
Magda Sibley ◽  
Antonio Peña-García
Keyword(s):  
Comparative Analysis ◽  
Flat Glass ◽  
Climatic Conditions ◽  
Long Term Effect ◽  
Different Types ◽  
The Difference ◽  
The Aesthetic ◽  
One Year ◽  
The One

This paper presents the first comparative study of its type of the performance of light pipes with different types of apertures: a flat glass versus a bohemian crystal dome. Measurements were taken at 20-minute intervals over a period of one year in the bathrooms of two newly built identical houses of the same orientation located in Manchester, UK. The comparative analysis of the data collected for both light pipes types reveals that the crystal domed aperture consistently outperforms the flat glass one. Furthermore, the difference in the recorded horizontal illuminance is most marked during the winter months and at the end of the one-year experiment, indicating that the crystal dome has better performance for low incident winter light and higher resistance for the long term effect of weathering and pollution. This study provides strong evidence based on long term real measurements. Such evidence informs architects’ decisions when weighing up the aesthetic considerations of a flat glass aperture versus the higher illumination levels afforded by a crystal dome aperture with higher resistance to weathering and pollution.

scholarly journals Wine Routes and Sustainable Social Organization within Local Tourist Supply: Case Studies of Two Italian Regions

2020 ◽  
Vol 12 (22) ◽  
pp. 9388
Author(s):  
Emilio Chiodo ◽  
Luigi Giordano ◽  
Jody Tubi ◽  
Rita Salvatore
Keyword(s):  
Multivariate Analysis ◽  
Comparative Analysis ◽  
Close Relation ◽  
Comparative Approach ◽  
Perceptions And Attitudes ◽  
Italian Regions ◽  
Route Management ◽  
Local Stakeholders ◽  
Depth Interviews

This paper is aimed at investigating wine companies’ perceptions and attitudes towards the role of wine routes as an actual tool to improve their tourist attractiveness and sustainable tourism on a territorial level. Through a comparative approach, some wineries from the Italian regions of Abruzzo and Tuscany have been surveyed and in-depth-interviews to key local stakeholders have been conducted. The aim of the survey is to investigate the companies’ perception about wine tourists’ characteristics and wine route management. Through a multivariate analysis, the reasons behind wineries’ satisfaction/discontent have been analyzed. The findings identify a close relation between the complexity of the services offered, the companies’ involvement in the wine routes management and their satisfaction about the results obtained. The more complex the services are, the more satisfied the companies. The comparative analysis of the strengths and weaknesses pointed out by the wineries’ keepers has allowed some general considerations about the tools to use for the improvement of wine routes management. In a broader sense, the wineries’ direct involvement both in investment and in governance appears to be key in the success of the routes as a model for local tourism development.

scholarly journals Morphological Variability of Pterocarpus erinaceus Poir. in Togo

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Benziwa N. Johnson ◽  
Marie Luce A. Quashie ◽  
Kossi Adjonou ◽  
Kossi N. Segla ◽  
Adzo D. Kokutse ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Morphological Variability ◽  
Principal Component ◽  
West African ◽  
Distribution Area ◽  
Terminal Leaflet ◽  
Forest Species ◽  
Morphological Descriptors ◽  
Pterocarpus Erinaceus ◽  
Relevant Variables

Pterocarpus erinaceus Poir. (Fabaceae), also called Vène or West African rosewood, is a multipurpose endemic forest species of Sahelo-Sudanian and Sudano-Guinean savannas and forests of West Africa. In Togo, the species is overexploited, which dangerously hinders its survival. The need and emergency of restoring declining stands, using seeds, or propagating material suggests an assessment of its morphological variability. The purpose of this study is to identify the discriminating morphological descriptors, allowing us to describe and also to characterize the species. Five provenances distributed over the whole geographical distribution area in Togo were evaluated for leaf (7 descriptors), fruit (4 descriptors), and seed (4 descriptors) traits. The coefficient of variation (CV) and the principal component analysis (PCA) are used to assess the variability among tree populations. Results show that the discriminating morphological descriptors for P. erinaceus in Togo are the width of the leaf and the terminal leaflet, the length and the width of the fruit, and length and the weight of the seed. These six main relevant variables allow us to discriminate three morphological groups of P. erinaceus population.

Assessment of gminas’ socio-economic development in the Mazowieckie Voivodship using methods of multivariate analysis

2016 ◽  
Vol 61 (6) ◽  
pp. 59-69 ◽  
Author(s):  
Mariola Chrzanowska ◽  
Nina Drejerska
Keyword(s):  
Economic Development ◽  
Multivariate Analysis ◽  
Data Analysis ◽  
Comparative Analysis ◽  
Statistical Methods ◽  
Local Development ◽  
Relative Level ◽  
Development Level ◽  
Socio Economic Development ◽  
Quantitative Characteristics

Statistical methods for comparing objects allow them to study taking into account several features simultaneously, thereby increasing the efficiency of testing. It can be concluded that the methods of multidimensional comparative data analysis can provide specific research instruments of local development. The article presents the proposal to apply to study the level of development of gminas in the Mazowieckie Voivodship two methods of multidimensional comparative analysis, ie. indicator of the relative level of development as well as a synthetic measure which takes into account the zero unitarisation method. The assessment of the development level of gminas was carried out using quantitative characteristics based on data from the official statistics for the years 2007 and 2013.

Multivariate analysis in mungbean [Vigna radiata (L.) Wilczek] to identify the genetic donors for pubescence and agro-morphological traits

2015 ◽  
Vol 38 (6) ◽  
Author(s):  
Chandra Mohan Singh ◽  
S. B. Mishra ◽  
Anil Pandey ◽  
Madhuri Arya
Keyword(s):  
Multivariate Analysis ◽  
Seed Yield ◽  
Morphological Traits ◽  
Branch Angle ◽  
High Contribution ◽  
Genotypic Cluster ◽  
Biological Yield ◽  
Total Divergence ◽  
Beak Length ◽  
Selection Of

The present investigation was conducted with 36 genotypes of mungbean on 26 agro-morphological traits including seed yield and pubescence traits to access the degree of divergence for mungbean improvement during <italic>zaid</italic> 2012. These mungbean genotypes were grouped into seven clusters. Cluster IV comprised of 14 genotypes, forming the largest cluster followed by cluster VI comprised eight genotypes, cluster I comprised seven genotypes and cluster II comprised four genotypes. Three clusters <italic>viz.</italic>, cluster III, V & VII formed mono genotypic cluster. All the pubescence traits contributed towards total divergence. Among the agro-morphological traits, high contribution towards total divergence was recorded for beak length, average intermodal length, primary branch angle with main stem, biological yield, seed yield and pods per cluster, indicated the possibility of selection of parent(s) for hybridization to manipulate the targeted trait(s) for mungbean improvement.

Morphological variability within and among three species of Ziziphus genus using multivariate analysis

2017 ◽  
Vol 222 ◽  
pp. 180-186 ◽  
Author(s):  
Elham Norouzi ◽  
Javad Erfani-Moghadam ◽  
Arash Fazeli ◽  
Ali Khadivi
Keyword(s):  
Multivariate Analysis ◽  
Morphological Variability
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