scholarly journals Spatial distribution of the Daphnia longispina species complex and other planktonic crustaceans in the heterogeneous environment of canyon-shaped reservoirs

2007 ◽  
Vol 29 (7) ◽  
pp. 619-628 ◽  
Author(s):  
Jaromir Seda ◽  
Adam Petrusek ◽  
Jiri Machacek ◽  
Petr Smilauer
Keyword(s):  
Spatial Distribution ◽  
Species Complex ◽  
Heterogeneous Environment ◽  
Daphnia Longispina ◽  
Planktonic Crustaceans

Spatial distribution of intron 2 of nad1 gene haplotypes in populations of Norway and Siberian spruce (Picea abies–P. obovata) species complex

2015 ◽  
Vol 51 (10) ◽  
pp. 957-965 ◽  
Author(s):  
E. A. Mudrik ◽  
T. A. Polyakova ◽  
A. V. Shatokhina ◽  
G. N. Bondarenko ◽  
D. V. Politov
Keyword(s):  
Spatial Distribution ◽  
Picea Abies ◽  
Species Complex ◽  
Siberian Spruce ◽  
Nad1 Gene ◽  
Intron 2

Identifying hybridizing taxa within the Daphnia longispina species complex: a comparison of genetic methods and phenotypic approaches

Hydrobiologia ◽  
2010 ◽  
Vol 643 (1) ◽  
pp. 107-122 ◽  
Author(s):  
Štepánka Dlouhá ◽  
Anne Thielsch ◽  
Robert H. S. Kraus ◽  
Jaromír Seda ◽  
Klaus Schwenk ◽  
...  
Keyword(s):  
Species Complex ◽  
Daphnia Longispina

scholarly journals Hybridization dynamics and extensive introgression in the Daphnia longispina species complex: new insights from a high-quality Daphnia galeata reference genome

2021 ◽  
Author(s):  
Jana Nickel ◽  
Tilman Schell ◽  
Tania Holtzem ◽  
Anne Thielsch ◽  
Stuart R. Dennis ◽  
...  
Keyword(s):  
Species Complex ◽  
Sediment Cores ◽  
Resting Eggs ◽  
Freshwater Ecosystems ◽  
Daphnia Galeata ◽  
Daphnia Longispina ◽  
High Quality ◽  
Contemporary Gene Flow ◽  
Genome Wide ◽  
Hybridization And Introgression

AbstractHybridization and introgression are recognized as an important source of variation that influence adaptive processes; both phenomena are frequent in the genus Daphnia, a keystone zooplankton taxon in freshwater ecosystems that comprises several species complexes. To investigate genome-wide consequences of introgression between species, we provide here the first high-quality genome assembly for a member of the Daphnia longispina species complex, Daphnia galeata. We further re-sequenced 49 whole genomes of three species of the complex and their interspecific hybrids both from genotypes sampled in the water column and from single resting eggs extracted from sediment cores. Populations from habitats with diverse ecological conditions offered an opportunity to study the dynamics of hybridization linked to ecological changes and revealed a high prevalence of hybrids. Using phylogenetic and population genomic approaches, we provide first insights into the intra- and interspecific genome-wide variability in this species complex and identify regions of high divergence. Finally, we assess the length of ancestry tracts in hybrids to characterize introgression patterns across the genome. Our analyses uncover a complex history of hybridization and introgression reflecting multiple generations of hybridization and backcrossing in the Daphnia longispina species complex. Overall, this study and the new resources presented here pave the way for a better understanding of ancient and contemporary gene flow in the species complex, and facilitate future studies on resting egg banks accumulating in lake sediment.

scholarly journals Ethnically homogeneous settlements in ethnically heterogeneous environment

2014 ◽  
pp. 411-419
Author(s):  
Ivan Marinkovic
Keyword(s):  
Spatial Distribution ◽  
Total Population ◽  
Distribution Analysis ◽  
Heterogeneous Environment ◽  
Research Focus ◽  
Ethnic Affiliation ◽  
Albanian Population ◽  
Ethnic Homogeneity ◽  
The Republic

Ethnic homogeneity of settlements, or in other words, formation of ethnically homogeneous settlements in ethnically heterogeneous environment, such as Vojvodina, as well as the regions of Raska and Pcinja, is the issue which will be discussed in this paper. The analysis involves total population according to their ethnic affiliation (the 2011 Census), at the level of settlements. The estimates on the number of Albanian population at the level of settlements were made for the needs of this paper considering the fact that the census was not successful on the entire territory of the Republic because the ethnic Albanian boycotted it. Spatial distribution analysis and the determination of majority of population at the level of settlements represent the research focus of the paper. Furthermore, the aim of this paper was to point out certain ethnic characteristics of Serbian population (excluding Kosovo and Metohija), with the emphasis on the continuous trend of increasing number of people who do not want to declare their ethnic affiliation.

scholarly journals Diversity of the Daphnia longispina species complex in Chinese lakes: a DNA taxonomy approach

2014 ◽  
Vol 37 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Xiaolin Ma ◽  
Adam Petrusek ◽  
Justyna Wolinska ◽  
Sabine Gieβler ◽  
Yang Zhong ◽  
...  
Keyword(s):  
Species Complex ◽  
Daphnia Longispina ◽  
Dna Taxonomy

Lithography below 100 nm

1983 ◽  
Vol 41 ◽  
pp. 96-99
Author(s):  
L. D. Jackel
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Scattering ◽  
Electron Beam Lithography ◽  
Substrate Material ◽  
Local Electron ◽  
Electron Dose ◽  
Positive Resist ◽  
Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

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