| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Search the digital library catalog Help

Query: search in
search in
search in
search in
* old and bologna study programme


1 - 10 / 12
First pagePrevious page12Next pageLast page
Genetic diversity and population genetic structure analysis of Apis mellifera subspecies in Algeria and Europe based on complementary sex determiner (CSD) gene
Riad Fridi, Nacera Tabet Aoul, Guillaume Catays, Benjamin Basso, Kaspar Bienefeld, Aleš Gregorc, Alain Vignal, Kamila Canale-Tabet, 2022, original scientific article

Abstract: In honeybees, the mechanism of sex determination depends on genetic variation at the complementary sex determiner (CSD) locus, which has a large allelic diversity. In this study, we examined the population genetic structure and genetic diversity within the highly variable region (HVR) of CSD in five Apis mellifera subspecies, in addition to Buckfast and unknown mixed ancestry bees. We sequenced CSD in 329 drones, 146 from Algeria (A. m. intermissa and A. m. sahariensis subspecies) and 183 from Europe (A. m. ligustica, A. m. carnica, A. m. mellifera subspecies, Buckfast samples, and individuals of unknown mixed ancestry). A total of 119 nucleotide haplotypes were detected. These corresponded to 119 protein haplotypes, of which 81 were new. The analysis of these haplotypes showed that HVR diversity levels were comparable with those in other populations of honeybee worldwide. Paradoxically, this high level of diversity at the locus did not allow for a separation of the samples according to their subspecies origin, which suggested either an evolutionary convergence or a conservation of alleles across subspecies, and an absence of genetic drift. Our results can be used to provide more information about the CSD diversity to include in breeding programs of honeybee populations.
Keywords: Apis mellifera, complementary sex determiner, polymorphism, DNA, genetic diversity, HRV
Published in DKUM: 12.06.2024; Views: 12; Downloads: 0
.pdf Full text (2,64 MB)
This document has many files! More...

Understorey species distinguish late successional and ancient forests after decades of minimum human intervention : a case study from Slovenia
Mirjana Šipek, Tim Ravnjak, Nina Šajna, 2023, original scientific article

Abstract: The main species composition drivers in temperate deciduous forests are environmental conditions, a stand's age and the site history, e.g., the succession stage and past land use, as well as disturbance regime and current management. We compared plant species diversity and composition in late successional and ancient forests, co-occurring on the same small river island applying species accumulation curves and nonmetric multidimensional scaling, respectively. Given the island's geomorphological characteristics, we expected these to be very similar before human intervention in the past. The forests experienced differing disturbance regimes in the past, while over the last 30 years, human intervention has been the same and reduced to a minimum. The ancient forest in this study had two major characteristics defining it as old, mature forest: continuity of presence for more than 200 years and specific composition. The late successional forest experienced major disturbance in the 20th century and was allowed natural regeneration by bordering on the ancient forest, representing a potential species pool, and by decades of minimum human intervention. Our results showed that, even though there was no difference in species richness, we could still detect differences between the forests, particularly in the abundance and species composition of the understorey, among which geophytes had the most indicative importance. To make our results useful on a broader scale, we composed from the literature a species list of plants indicative for ancient forest and tested its application. These results are important for distinguishing between old and mature secondary stands and particularly for identifying old forest stands, which should be conserved and, in the case of fragmented landscapes, included in a network connecting forest fragments.
Keywords: forest community, successional forest, indicator plants, plant diversity, understorey, geophyte, Slovenia
Published in DKUM: 03.06.2024; Views: 82; Downloads: 0
.pdf Full text (1,53 MB)
This document has many files! More...

Genetic diversity and structure of Slovenian native germplasm of plum species (P. domestica L., P. cerasifera Erhrh. and P. spinosa L.)
Tina Ternjak, T. Barreneche, Metka Šiško, Anton Ivančič, Andrej Šušek, Garcia José Quero, 2023, original scientific article

Abstract: Slovenia has particular climatic, soil, geographic and historical conditions that lead to long tradition of plum cultivation and use. In this work, a set of 11 SSR and three universal cpDNA markers, as well as flow cytometry, were used to (1) evaluate the genetic diversity of 124 accessions of the three Prunus species (P. domestica L., P. cerasifera Ehrh., and P. spinosa L.), (2) investigate the possible involvement of P. cerasifera and P. spinosa species in P. domestica origin, (3) study the genetic relationships and variability among the most typical P. domestica accessions present in Slovenia. Ten haplotypes of cpDNA were identified and clustered into three groups according to the Neighbor-Joining analysis (NJ). All 11 SSR primer pairs were polymorphic, revealing 116 unique genotypes. A total of 328 alleles were detected with an average value of 29.82 alleles per locus, showing relatively high diversity. Bayesian analysis of genetic structure was used to identify two ancestral populations in the analyses of all three species as well as in a separate set consisting of P. domestica material only. Principal Coordinate Analysis (PCoA) showed that accessions clustered largely in agreement with Bayesian analysis. Neighbor-Joining analysis grouped 71 P. domestica accessions into three clusters with many subgroups that exhibited complex arrangement. Most accessions clustered in agreement with traditional pomological groups, such as common prunes, mirabelle plums and greengages. In this study, the analyses revealed within P. domestica pool valuable local landraces, such as traditional prunes or bluish plums, which seem to be highly interesting from a genetic point of view. Moreover, complementary approaches allowed us to distinguish between the three species and to gain insights into the origin of plum. The results will be instrumental in understanding the diversity of Slovenian plum germplasm, improving the conservation process, recovering local genotypes and enriching existing collections of plant genetic resources.
Keywords: Prunus spp., plum, genetic resources, genetic diversity, genetic structure, spDNA, SSR
Published in DKUM: 27.05.2024; Views: 121; Downloads: 6
.pdf Full text (966,75 KB)
This document has many files! More...

Contrasting responses of alien and ancient forest indicator plant species to fragmentation process in the temperate lowland forests
Mirjana Šipek, Lado Kutnar, Aleksander Marinšek, Nina Šajna, 2022, original scientific article

Abstract: Fragmentation is one of the major threats to biodiversity. In a fragmented landscape, forest specialists are losing suitable forest habitats with specific site and microclimate conditions, which results in their local extinction. Conversely, the invasion of alien species is facilitated by open forest areas and increased boundaries between forest fragments and adjacent land. We studied the effect of fragmentation in terms of fragment size impact on overall plant species richness and on selected ecologically important groups' richness, composition, and diversity. We surveyed vegetation in the interior of 47 fragments of various sizes and one unfragmented reference forest. Our results reveal that the effect of fragmentation is complex and differs for studied plant groups. Decreasing fragment size negatively affects the overall plant richness and richness of native and ancient forest indicator plants as well as their diversity, while the effect is positive for alien plants. The highest proportion of ancient forest indicator plant species and the lowest proportion of alien plants in the unfragmented forest underline the great conservation value of forest fragments. At the same time, our results reveal that large and diverse forest ecosystems are susceptible to biological invasions as well.
Keywords: forest fragment, indicator plants, invasion, diversity, habitat modification, habitat conservation
Published in DKUM: 12.07.2023; Views: 254; Downloads: 32
.pdf Full text (2,16 MB)
This document has many files! More...

Economic and social diversity in Australia's cotton-producing communities
Tony Sorensen, Bernice Kotey, 2009, original scientific article

Abstract: Australia’s highly profitable cotton industry is geographically constrained to districts in northern New South Wales and Southern Queensland. However, the rural towns servicing the industry are facing unprecedented stress on account of fierce commercial competition between them, many years of drought during the 2000s, technological innovation in cotton production, the chance occurrence of non-agricultural economic opportunities, and even ethnic composition. Our research focuses on the role of innovative small business in overcoming community stress and we have selected a small sample of six local government areas to examine this link in depth. The selection of a representative sample entailed the classification of cotton communities on the basis of their economic and social profiles and how they had evolved over the inter-census period 2001-06. This analysis surprisingly showed that cotton growing regions are highly differentiated not just at a single point in time (2006), but also in their development trajectories. This considerably complicated the process of sample selection, but also demonstrated the diversity of rural settlement.
Keywords: diversity of rural settlements, non-agricultural activity, cotton industry, innovative SME’s
Published in DKUM: 19.03.2018; Views: 1049; Downloads: 101
.pdf Full text (153,68 KB)
This document has many files! More...

Training in diversity management
Sonja Treven, Urška Treven, 2007, original scientific article

Abstract: The labor force all around the world is becoming increasingly diverse. Thus, organizations that can manage employee diversity effectively gain a competitive advantage. In such organizations diversity training is a necessity. Diversity training helps managers understand and value individual differences and develop strong diagnostic skills. The paper explores various approaches to training, like awareness-based and skill-based diversity training. A special attention to potential problems that may occur in the process of diversity training is given.
Keywords: diversity management, training, employment, competitiveness, human resources, management
Published in DKUM: 26.07.2017; Views: 1658; Downloads: 482
.pdf Full text (304,67 KB)
This document has many files! More...

Emergence of target waves in paced populations of cyclically competing species
Luo-Luo Jiang, Tao Zhou, Matjaž Perc, Xin Huang, Bing-Hong Wang, 2009, original scientific article

Abstract: We investigate the emergence of target waves in a cyclic predator-prey model incorporating a periodic current of the three competing species in a small area situated at the center of a square lattice. The periodic current acts as a pacemaker, trying to impose its rhythm on the overall spatiotemporal evolution of the three species. We show that the pacemaker is able to nucleate target waves that eventually spread across the whole population, whereby three routes leading to this phenomenon can be distinguished depending on the mobility of the three species and the oscillation period of the localized current. First, target waves can emerge due to the synchronization between the periodic current and oscillations of the density of the three species on the spatial grid. The second route is similar to the first, the difference being that the synchronization sets in only intermittently. Finally, the third route toward target waves is realized when the frequency of the pacemaker is much higher than that characterizing the oscillations of the overall density of the three species. By considering the mobility and frequency of the current as variable parameters, we thus provide insights into the mechanisms of pattern formation resulting from the interplay between local and global dynamics in systems governed by cyclically competing species.
Keywords: cyclical interactions, target waves, spatial games, diversity
Published in DKUM: 30.06.2017; Views: 1482; Downloads: 386
.pdf Full text (2,81 MB)
This document has many files! More...

Does strong heterogeneity promote cooperation by group interactions?
Matjaž Perc, 2011, original scientific article

Abstract: Previous research has highlighted the importance of strong heterogeneity for the successful evolution of cooperation in games governed by pairwise interactions. Here we determine to what extent this is true for games governed by group interactions. We therefore study the evolution of cooperation in the public goods game on the square lattice, the triangular lattice, and the random regular graph, whereby the payoffs are distributed either uniformly or exponentially amongst the players by assigning to them individual scaling factors that determine the share of the public good they will receive. We find that uniformly distributed public goods are more successful in maintaining high levels of cooperation than exponentially distributed public goods. This is not in agreement with previous results on games governed by pairwise interactions, indicating that group interactions may be less susceptible to the promotion of cooperation by means of strong heterogeneity than originally assumed, and that the role of strongly heterogeneous states should be reexamined for other types of games.
Keywords: social dilemmas, cooperation, public goods, inequality, social diversity
Published in DKUM: 30.06.2017; Views: 1378; Downloads: 414
.pdf Full text (862,29 KB)
This document has many files! More...

Training programs for managing well-being in companies
Sonja Treven, Urška Treven, Simona Šarotar Žižek, 2015, original scientific article

Abstract: This paper discussed the significance of well-being (WB) and well-being management (WBM). As successful WBM requires the implementation of different training programs, such programs are presented in detail. The cause–effect relationship between training and individual/organizational performance is researched as well. The aim of the research to support this article was to present WBM, its training programs, as well as the determination of WBM activities concerning the mentioned programs implemented in Slovenian organizations.
Keywords: training, well-being, employee diversity, stress
Published in DKUM: 03.04.2017; Views: 1360; Downloads: 397
.pdf Full text (409,68 KB)
This document has many files! More...

Search done in 3.5 sec.
Back to top
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica