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Tytuł:
Ocena zmian struktury pracujących w unijnych regionach szczebla NUTS 2 z wykorzystaniem miary Braya i Curtisa
Structural changes of employment in EU NUTS 2 regions evaluated with Bray & Curtis measure
Autorzy:
Markowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/438833.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
regiony NUTS 2
sektory gospodarki
struktury pracujących
zróżnicowanie struktur
NUTS 2 regions
economic sectors
employment structure
structure diversity
Opis:
Celem artykułu jest ocena zmian struktury pracujących, zaobserwowanych w europejskiej przestrzeni regionalnej szczebla NUTS 2. Struktura pracujących zostanie ujęta w układzie trzech sektorów gospodarki, czyli rolnictwa, przemysłu i usług. Zakres czasowy prowadzonych badań dotyczy dwóch zazębiających się okresów, lat 2000–2008 i 2008–2012, co wynika ze sposobu prezentacji danych w bazach Eurostatu (zmiana podejścia do nomenklatury Europejskiej Klasyfikacji Działalności Gospodarczej NACE z 1997 roku, która w 2008 roku została uaktualniona). Przyczyny zmian to głównie pojawienie się nowych dziedzin działalności, zwłaszcza tych związanych z usługami i technologiami informacyjnymi oraz komunikacyjnymi. W nowym układzie NACE różnią się głównie dane na temat działalności firm, a z tego powodu także dane dotyczące rynku pracy, w tym – przykładowo – zmieniły się definicje pracujących w przemysłach wysokiej technologii i usługach opartych na wiedzy, co spowodowało utratę porównywalności. Jako metodę badawczą zastosowano w pracy miarę zróżnicowania struktur, co umożliwi identyfikację intensywności przeobrażeń na rynku pracy w czasie i przestrzeni.
The aim of the paper is the evaluation of the changes observed in the employment structure at the European regional space of NUTS 2 level. The employment structure is expressed in three elements: agriculture, industry and services. Data covers two overlapping periods: 2000–2008 and 2008–2012. This is because of the changes in Eurostat data bases imposed by the update of European Classification of Economic Activities introduced in 2008 to the original regulation from 1997. New activities were defined, mainly in the field of information services and technologies. In new system, information on enterprises and labour market and some definitions in high-tech industries and services are not fully comparable with the old one. This problem is discussed in the paper. The measure of structures diversity is the basic research method for the analysis presented in the paper. It makes it possible to identify the intensity of labour market changes in both time and space.
Źródło:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2015, 29, 2; 7-22
2080-1653
Pojawia się w:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przestrzenne zróżnicowanie struktury społecznej wsi
Spatial Diversity of Rural Social Structure
Autorzy:
Halamska, Maria
Powiązania:
https://bibliotekanauki.pl/articles/652490.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
struktura społeczna
przestrzeń społeczna
dezagraryzacja
proletaryzacja
burżuazyjnienie
zróżnicowanie struktury społecznej
social structure
social space
desagrarisation
proletarisation
bourgeoisement
diversity of social structure
Opis:
The social structure of the Polish countryside has deeply changed during the last thirty years because of three co-occurring processes: desagrarisation/depeasantisation, proletarisation, and bourgeoisement/gentrification. Representative studies dating from 1991, 2003, and 2013 show changes in fundamental elements of the social position of rural population, namely sources of income, education level, and professional structure. At present, the dominating segment of the social structure of the countryside is workers (45.6%), whereas ratios of farmers and of the so-called new middle class are the same (27.2% each). The spatial diversification of this structure is, however, strong, as exemplified by differences between historical regions (territories formerly belonging to Prussia, Austria, and Russia), multi-functional urbanised vs. mainly rural areas, and administrative units (voivodeships). The most important differences in social structure and the dynamics of its change are between multi-functional urbanised and mainly rural areas.  
W ostatnim trzydziestoleciu struktura społeczna polskiej wsi gruntownie się zmieniła. Sprawiły to trzy, nakładające się, procesy: dezagraryzacja/depezantyzacja, proletaryzacja oraz burżuazyjnienie/gentryfikacja. Autorka, na podstawie danych z reprezentatywnych badań prowadzonych w latach 1991, 2003 oraz 2013, ukazuje zmiany w zakresie podstawowych elementów położenia społecznego ludności wiejskiej: źródeł dochodów, poziomu wykształcenia oraz struktury zawodowej. Dominującym segmentem w strukturze społecznej wsi są obecnie robotnicy (45,6%), natomiast udział rolników i tzw. nowej klasy średniej równoważy się i wynosi po 27,2%. Istnieje jednak duże przestrzenne zróżnicowanie tej struktury, co ukazane zostało na przykładzie regionów historycznych (byłe zabory), obszarów wielofunkcyjnych zurbanizowanych i głównie rolniczych oraz regionów polityczno-administracyjnych (województwa). Największe różnice w strukturze społecznej i dynamice zmian istnieją między obszarami wielofunkcyjnymi zurbanizowanymi a obszarami głównie rolniczymi.
Źródło:
Acta Universitatis Lodziensis. Folia Sociologica; 2017, 63; 7-27
0208-600X
2353-4850
Pojawia się w:
Acta Universitatis Lodziensis. Folia Sociologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Never forget where you come from: Critical diversity literacy and structure-facing virtue among first-year students
Autorzy:
Conradie, Marthinus
Lasocka-Bełc, Olga
Powiązania:
https://bibliotekanauki.pl/articles/37257797.pdf
Data publikacji:
2024-06-25
Wydawca:
Akademia Pedagogiki Specjalnej. Language and Society Research Committee
Tematy:
critical diversity literacy
structure-facing virtue
racism
Opis:
This article investigates tensions that arose when a group of Learning Facilitators (LFs) and students collaboratively examined the socially constructed nature of racial identity. These discussions transpired in a South Africa Department of English, in an introductory module in postcolonial literature designed for first-year students. The core contribution of the article lies in conjoining critical diversity literacy (CDL) and structure-facing virtue to theorise this tension. It also produces suggestions for deepening the emancipatory potential of such discussions about identity and power in ways that are intended to be relevant to other settings in which comparable discussions are occurring between students and contractually appointed university teachers like LFs.
Źródło:
Language, Discourse & Society; 2024, 12, 1 (23); 73-92
2239-4192
Pojawia się w:
Language, Discourse & Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic status of Polish larch (Larix decidua subsp. polonica (Racib. Domin)) from Chełmowa Mountain: implications for gene conservation
Autorzy:
Litkowiec, M.
Lewandowski, A.
Burczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2078281.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
European larch
genetic diversity
microsatellites
spatial genetic structure
Opis:
The Polish larch (Larix decidua subsp. polonica (Racib. Domin), a subspecies of European larch, is one of the most valuable forest-forming trees in Poland. It was first discovered on the Chełmowa Mountain where Natural Reserve has been established to protect this subspecies. Currently, this unique population is at risk of extinction. Nonetheless, the knowledge on the genetic diversity of this population and surround- ing larch forests is insufficient to undertake actions aimed at conservation of genetic resources. In this study, we examined the level of genetic diversity and differentiation of four subpopulations of Polish larch from Nature Reserve on the Chełmowa Mountain and surrounding areas. We used eleven nuclear microsatellite markers (SSRs) combined in two multiplex PCR reactions. In total, 344 individuals of Polish larch were genotyped and subjected to further population genetic analyses. We found the high level of genetic diversity (average: He = 0.752, Ho = 0.720) and low levels of genetic differentiation (average: Fst = 0.022). The effective population size was large and homogeneous across subpopulations (mean Ne=90.7), and we found no sign of inbreeding. The spatial genetic structure was detected in two older subpopulations but not in the younger one, suggesting its artificial origin. The old larch subpopulations were genetically homogeneous and they were related to the ancestral group of Polish lowland populations. The old larch core populations growing on Chełmowa Mountain are relatively homogeneous and they well represent the ancestral genetic group of Polish lowland larch populations. However, they still exhibit rela- tively high genetic diversity and sufficiently large effective population sizes assuring their adaptive potential for a long-term existence. Surrounding larch populations are even more genetically diverse but this might be the effect of an admixture of seed sources from various populations from a wider area of Central Europe. We recommend that specific conservation efforts should be undertaken to promote natural regeneration of the core larch populations, even supplemented by the planting of seedlings derived from the oldest larch trees. Other management actions should focus on limiting external gene flow to this unique population of Polish larch.
Źródło:
Dendrobiology; 2018, 80; 101-111
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microspatial structure of the seed bank of xerothermic grassland - intracommunity differentiation
Autorzy:
Czarnecka, J
Powiązania:
https://bibliotekanauki.pl/articles/56952.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
microspatial structure
spatial structure
intracommunity differentiation
species diversity
seed bank
xerothermic grassland
Opis:
The study analyses the quantity and spatial structure of the seed bank of the xerothermic grassland located in the Biała Góra near Tomaszów Lubelski (Central Roztocze Region). The seed stock of the bank was compared with the vegetation found in two different patches of the examined grassland. The number of seeds per square meter was estimated at 5328 and 5355, depending on the patch. The seed bank's spatial organisation is clustered. The most important factors determining this spatial distribution are: remaining of the seeds in close vicinity of parent plants, and the "group" dispersal of the seeds and fruits.
Źródło:
Acta Societatis Botanicorum Poloniae; 2004, 73, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przestrzenne zróżnicowanie ludności według wieku w Polsce w latach 1991-2010
Differentiation of the Population by Age and Voivodships in Poland, 1991-2010
Autorzy:
Podogrodzka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/587195.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Ludność
Struktura demograficzna
Zróżnicowanie regionalne
Demographic structure
Population
Regional diversity
Opis:
From two decades we have observed changing of demographic processes (and these processes were not similar by voivodships) which have lead to changed of structure of the population by age. Purpose of the article is a description of it, extract the similar regions and assessment of the regions structures of the population to the progressive pyramid of age. This approach will allow to assessment of the spatial dynamics of the process of ageing of the population.
Źródło:
Studia Ekonomiczne; 2014, 167; 62-76
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of tree diversity and stand structure on above-ground carbon storage in evergreen broad-leaved and deciduous forests in Southeast Vietnam
Autorzy:
Tuan, N.T.
Rodriguez-Hernandez, D.I.
Tuan, V.C.
Quy, N.V.
Obiakara, M.C.
Hufton, J.
Powiązania:
https://bibliotekanauki.pl/articles/2130199.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Biodiversity assessment
Ecosystem functioning
Taxonomic diversity
Natural forests
Stand structure
Opis:
Understanding the relationship between tree species diversity and above-ground carbon (AGC) storage in tropical forests is essential for a sustainable flow of ecosystem goods and services. Although tropical forests of Vietnam are of particular interest due to their high biodiversity and carbon density, few studies have evaluated the relative importance of species composition, tree species diversity and forest structure on AGC storage by forest vegetation type. In this study, we tested for the influence of taxonomic diversity, forest structure and species composition on AGC storage in evergreen broad-leaved and deciduous forests of Southeast Vietnam. Data was collected within 137 rectangular plots (25 m × 20 m), randomly selected across a deciduous forest (DF) and four evergreen broad-leaved forest (EB) categories, with different standing volumes levels: very poor (EBG), poor (EBP), medium (EBM) and rich (EBR). In total, we identified 3687 individuals from 110 tree species belonging to 46 families in 6.85 hectares of sampled area. AGC storage significantly differed among forest categories, ranging from 14.81 Mg ha−1 in EBG to 146.74 Mg ha−1 in EBR. There was higher AGC in the medium diameter class (20-40 cm), except for EBR where there was higher AGC within individuals of 40-60 cm in diameter. Taxonomic diversity was weakly correlated with AGC while stand structure (stem density and maximum diameter) were strongly correlated. Our results suggest that maintaining the abundance distributions of remnant tree species, particularly that of large trees, is one important method to enhance AGC storage in the tropical ecosytems of southern Vietnam.
Źródło:
Dendrobiology; 2022, 88; 38-55
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodiversity of the crop structure on farms participating in the Polish FADN in terms of the requirements of the Common Agricultural Policy
Autorzy:
Madej, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2163437.pdf
Data publikacji:
2023-01-31
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
crop structure
crop diversity and uniformity
natural environment
Polish FADN
Opis:
The crops structure (or cropping pattern) of a farm is a production and economic feature of a farm. In addition, it is an element shaping the biodiversity of rural areas.The paper presents research on the diversity and uniformity of the structure of crops on farms of various production directions and economic size, participating in the Polish FADN network. We use three biodiversity indicators: the number of plant species cultivated on the farm, the Shannon-Wiener index (H’) and the Pielou equality index (J’).The research showed the differences of the biodiversity indicator of the crop structure and its uniformity. The greatest diversity (Shannon-Wiener index) (H’ = 1.59) and uniformity (J’ = 0.71) of crops were found on farms with permanent crops, where the share of arable lands did not exceed 25%. Farms with field crops with a high share of industrial plants and potatoes had lower values of the indicators (H’ = 1.42 and J’ = 0.63, respectively), Different results were recorded on farms with granivorous animals, with the lowest diversity (H’ = 0.93) and uniformity (J’ = 0.42). Those farms had also the highest share of cereals in crop structure (75.5%).In the analysis of farms in terms of economic size, the highest value of the crop structure diversity index (H’ = 1.51) was found on big farms (100≤thous. €<500), with the highest share of industrial plants and vegetables in field cultivation. The lowest diversity, decreasing with the economic size of farms, was characteristic for very small farms (2≤thous. €<8) with the highest (75.3%) share of cereals.Taking into account the requirements of crop diversification applicable under greening policy, the limit values of the indicators of diversity and uniformity of the crop structure were determined for farms with more than 10 ha of arable land. The comparison of the crop structure indexes obtained in the research with their limit values for farms with different production directions showed that for all compared groups of farms the diversity of the crop structure exceeded the limit value. On the other hand, the uniformity of the sown structure was at the level of the limit value only on farms with field crops, and in other cases it did not exceed the limit value. In the case of all groups of farms, depending on the economic size, the diversity of the crop structure exceeded the limit value, and in the case of its uniformity, this applied to farms with an economic size of more than 50 thousand €.
Źródło:
Polish Journal of Agronomy; 2022, 51; 55-62
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Land cover and landscape diversity analysis in the West Polesie Biosphere Reserve
Autorzy:
Chmielewski, S.
Chmielewski, T.J.
Tompalski, P.
Powiązania:
https://bibliotekanauki.pl/articles/24906.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
land cover
cover structure
landscape diversity
analysis
West Polesie Biosphere Reserve
Opis:
The aim of this research was to present the land cover structure and landscape diversity in the West Polesie Biosphere Reserve. The land cover classification was performed using Object Based Image Analysis in Trimble eCognition Developer 8 software. The retrospective land cover changes analysis in 3 lake catchments (Kleszczów, Moszne, Białe Włodawskie Lakes)was performed on the basis of archival aerial photos taken in 1952, 1971, 1984, 1992, 2007 and one satellite scene from 2003 (IKONOS).On the basis of land cover map structure, Shannon diversity index was estimated with the moving window approach enabled in Fragstats software. The conducted research has shown that the land cover structure of the West Polesie Biosphere Reserve is diverse and can be simply described by selected landscape metrics. The highest level of land cover diversity, as showed by Shannon Diversity Index, was identified in the western part of the West Polesie Biosphere Reserve, which is closely related to the agricultural character of land cover structure in those regions. The examples of three regional retrospective land cover analyses demonstrated that the character of land cover structure has changed dramatically over the last 40 years.
Źródło:
International Agrophysics; 2014, 28, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of environmental factors and management on dynamics of mixed calcareous forests under climate change in Central European lowlands
Autorzy:
Vancura, K.
Simkova, M.
Vacek, Z.
Vacek, S.
Gallo, J.
Simunek, V.
Podrazsky, V.
Stefancik, I.
Hajek, V.
Prokupkova, A.
Kralicek, I.
Powiązania:
https://bibliotekanauki.pl/articles/2130171.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
hornbeam-oak groves
beech forests
stand structure
diversity
radial growth
Czech Republic
Opis:
Mixed lowland forests reserved for natural succession are sparse in the Czech Republic. However, their development provides essential insights into the natural processes of these forests and recommendations for forest management in a changing climate. The research describes the dynamics, productivity, structure, diversity, dead wood, and radial growth of hornbeam-oak groves and calcareous beech-dominated forests in the Karlštejn National Nature Reserve (Czechia) based on inventory in 2002, 2008, 2014 and 2020. The objective was to evaluate changes in differently managed stands (high forest, coppice with standards, and coppice) after leaving the stands to spontaneous development in 2004. The tree density increased by 2–10% from 2002 to 2014 and decreased by 6–18% in 2020. In the high forest, an increase in the stand volume was observed during the whole period, while in the coppice with standards and coppice, only until 2014. The stand volume ranged from 190 (coppice) to 630 (high forest) m³ ha−1 in 2020 and increased by an average of 28% over 18 years. Overall diversity of tree layer showed an uneven structure in the high forest and a substantially diverse structure in the other variants. The deadwood volume has been steadily increasing (18–35 m³ ha−1 in 2020), accumulating an average of 1 m³ ha−1 yr−1. A lack of precipitation and high temperatures from June to August were the main limiting factors of the radial growth of tree species, while the number of negative pointer years has increased in the last decade. European beech (Fagus sylvatica L.) was the most sensitive tree species to climate compared to the resilient European ash (Fraxinus excelsior L.). The lowest fluctuations in the diameter increment were recorded in Norway maple (Acer platanoides L.) and the highest in beech in the temperature cycles of 7–15 years. Over the last 20 years, sessile oak [Quercus petraea (Matt.) Liebl.] showed an increase in radial growth by 7%, while other tree species reported a decrease with a maximum in beech (by −38%). The forest stands managed as high forest, characterized by a higher production potential and lower diversity, had slower dynamics when compared to coppice with standards and coppice.
Źródło:
Dendrobiology; 2022, 87; 79-100
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of genetic diversity of Ficus carica L. (Moraceae) collection using simple sequence repeat (SSR) markers
Autorzy:
Marcotuli, I.
Mazzeo, A.
Nigro, D.
Giove, L.
Giancaspro, A.
Colasuonno, P.
Prgomet, Ž.
Prgomet, I.
Tarantino, A.
Ferrara, G.
Gadaleta, A.
Powiązania:
https://bibliotekanauki.pl/articles/12664546.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Moraceae
common fig
Ficus carica
population structure
genetic analysis
genetic diversity
SSR marker
Opis:
Modern technologies and accurate information on genetic diversity and structure are contributing to improve the plant breeding, in particular for all the minor species with a lack of data. Genetic diversity of 139 different Ficus carica L. genotypes collected from Italy and Croatia, and divided into two subgroups: uniferous (only main crop) and biferous (breba and main crop), was investigated using 49 microsatellite markers. A total of 70 alleles were generated, of which 64 (91.4%) showed a polymorphic pattern indicating high level of genetic diversity within the studied collection. The mean heterozygosity over the 64 single locus microsatellites was 0.33 and the expected and observed averaged variance were 16.50 and 184.08, respectively. The 139 fig genotypes formed two clusters in the PCoA analysis, suggesting a division between Italian and Croatian genotypes. Moreover, the fig accessions could be divided into two main clusters based on the STRUCTURE analysis according to the biological type, uniferous or biferous, with partly overlapping varieties. In conclusion, our results demonstrated that molecular markers were able to discriminate among genotypes and useful for the authentication of fig tree varieties (homonymies and synonymies).
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 93-109
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of North African Thymus algeriensis in Tunisia: Population structure and implication for conservation
Autorzy:
Ben El Hadj Ali, I.
Guetat, A.
Boussaid, M.
Powiązania:
https://bibliotekanauki.pl/articles/41188.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
genetic diversity
North Africa
Thymus algeriensis
Tunisia
population structure
molecular marker
natural population
conservation
Opis:
The genetic diversity within and among nine natural populations of Thymus hirtus Willd. subsp. algeriensis (Boiss. et Reut.) Murb. from different geographical and bioclimatic zones were assessed using Random Amplified Polymorphic DNA data. A total of 154 bands were generated from seven selected primers. 141 bands were polymorphic (P=91.56%). The genetic diversity within a population based on Shannon's index which was high (H'pop=0.307) and varied according to bioclimatic zones. A high genetic differentiation among populations (GST=0.335 and FST=0.296) was revealed, suggesting a population isolation and a low level of gene flow among them. The major proportion of the variation was attributable to individual differences within populations. The genetic structure is in accordance with geography distances. The Neighbour- joining tree based on Nei's and Li's genetic distance among individuals showed that individuals from each population clustered together. The UPGMA dendrogram based on FST values revealed three clusters each of them includes populations closuring to their geographical origin. The high genetic structure of populations resulted from genetic drift caused both by the habitat fragmentation and the low size of most populations. The in situ conservation should interest all populations. The ex situ conservation should be based on the collection of seeds rather within than among populations because of the maximum of variation was revealed within populations.
Źródło:
Dendrobiology; 2012, 67
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of wild Thymus capitatus (Lamiaceae) in Tunisia using molecular markers
Autorzy:
Ben El Hadj Ali, I.
Guetat, A.
Boussaid, M.
Powiązania:
https://bibliotekanauki.pl/articles/41663.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
genetic diversity
wild plant
Thymus capitatus
Lamiaceae
Tunisia
molecular marker
habitat fragmentation
conservation strategy
genetic structure
Opis:
In Tunisia, Thymus capitatus L. populations are severely destroyed due to deforestation and over-collecting. The species occurs in small scattered populations decreasing progressively in size. Yet, no conservation or improvement programs are attempted to preserve and promote the potential value of this resource. In this work, we assessed the genetic diversity of nine Tunisian populations of Thymus capitatus L. from different bioclimates, using 103 polymorphic randomly amplified polymorphic DNA (RAPD) loci. The analysis of the genetic variation within and among populations is primordial to elaborate conservation and improvement programs. The species showed a low diversity within populations (0.276
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low genetic diversity in the endangered population of Viola uliginosa in its locus classicus at Rzaska near Cracow [southern Poland] as revealed by AFLP markers
Autorzy:
Cieslak, E
Paul, W.
Ronikier, M.
Powiązania:
https://bibliotekanauki.pl/articles/58111.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
genetic diversity
endangered population
Viola uliginosa
Rzaska n.Krakow
Polska
AFLP marker
plant conservation
rare plant
threatened plant
wet habitat
genetic structure
population structure
Opis:
An extremely endangered population of Viola uliginosa Besser at the classical locality of this taxon has been studied. The AFLP analysis was based on 18 specimens of V. uliginosa (about 10% of preserved individuals); additionally, two individuals of V. riviniana were included in the data set as the out group. A high genetical uniformity of the whole population (similarity indexes close to 1) was detected. It was not correlated significantly with the spatial distribution of the plants. The study serves as a basis for practical conservation measures and at the same time as a starting point for a more extensive research on the genetical variability of the species throughout its range.
Źródło:
Acta Societatis Botanicorum Poloniae; 2006, 75, 3; 245-251
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implication of forest zonation on tree species composition, diversity and structure in Mabira Forest, Uganda
Autorzy:
Weldemariam, E.C.
Jakisa, E.S.
Ahebwe, D.A.
Powiązania:
https://bibliotekanauki.pl/articles/9997.pdf
Data publikacji:
2017
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
forest zonation
management zone
tree
woody species
plant species
species composition
species diversity
species structure
Mabira Forest Reserve
Uganda
Opis:
The study aimed to investigate effectiveness of forest management zoning in conserving biodiversity of Mabira forest reserve. The study sites buffer, production, and strict nature reserve management zones were purposively selected. This was undertaken through investigating woody species diversity, composition and structure. A total of 60 sampling plots with a size of 20 m x10 m were used to collect vegetation data. Variables such as woody plant species identification and counts as well as diameter at breast height (DBH) of trees were done. The result depicted a total of 65 woody species; 39 in buffer, 19 in productions and 37 in strict nature reserve. Of these, only 9 trees species were found common to all zones and their Sorensen similarity coefficient was 0.2213. The population structure of the buffer and strict nature reserve zones was found to be a J - shape pattern, whereas the production zone shown an inverted J-shape pattern. Higher woody species diversity was depicted in the buffer and strict nature zones with (H’=2. 73512) and (H’=2. 68412) respectively, and lower in a production zone (H’=1. 63628). The evenness index value of a buffer zone was (J =0. 746574), strict nature (J= 0.743335) and production (J=0. 555719). The production zone had shown higher IVI values followed by buffer and strict nature reserve zone. The most important woody species identified based on their IVI value were Broussonetia papyrifera (Production), Acalypha neptunica (Buffer), Funtumia Elastica (strict nature reserve). The existing forest management is effective in conserving the biodiversity of the forest reserve. Nevertheless, the production zone was still suffering from exploitation of the surrounding community, hence serve for protecting the remaining management zones from further human interference. Further investigation is also required on the adjacent community perceptions of the forest management zoning.
Źródło:
Environment, Earth and Ecology; 2017, 1, 1
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
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