Search results for: Victor A. Chepurnov

Items from 1 to 8 out of 8 results

chapter

Classical Breeding in Diatoms: Scientific Background and Practical Perspectives

Victor A. Chepurnov, Peter Chaerle, Luc Roef, Annemieke Meirhaeghe, more

Cellular Origin and Life in Extreme Habitats and Astrobiology > The Diatom World > Diatom Biology > 167-194

Diatoms are becoming increasingly attractive for scientists and important for various industrial applications. Diatoms are diploid sexual organisms and it is generally accepted that controlled genetic manipulations via sexual reproduction are instrumental for basic diatom research. For more practical aims, e.g., selection and “improvement” of economically relevant diatom strains, the classical breeding...

article

Highly Differentiated Populations of the Freshwater Diatom Sellaphora capitata Suggest Limited Dispersal and Opportunities for Allopatric Speciation

Katharine M. Evans, Victor A. Chepurnov, Hans J. Sluiman, Sindu J. Thomas, more

Protist > 2009 > 160 > 3 > 386-396

The diversities and distributions of diatoms are much more complex than was ever imagined. To understand the underlying mechanisms, research must focus on evolutionary processes occurring at a population level and employ sufficiently informative molecular markers. Using ten microsatellites and ITS rDNA sequence data, we investigated the genetic structure of populations of the benthic freshwater diatom...

article

A single bioavailability model can accurately predict Ni toxicity to green microalgae in soft and hard surface waters

Nele M.E. Deleebeeck, Frederik De Laender, Victor A. Chepurnov, Wim Vyverman, more

Water Research > 2009 > 43 > 7 > 1935-1947

The major research questions addressed in this study were (i) whether green microalgae living in soft water (operationally defined water hardness<10mg CaCO ₃ /L) are intrinsically more sensitive to Ni than green microalgae living in hard water (operationally defined water hardness >25mg CaCO ₃ /L), and (ii) whether a single bioavailability model can be used to predict the effect...

article

Lack of population genetic structuring in the marine planktonic diatom Pseudo-nitzschia pungens (Bacillariophyceae) in a heterogeneous area in the Southern Bight of the North Sea

Griet Casteleyn, Katharine M. Evans, Thierry Backeljau, Sofie D’hondt, more

Marine Biology > 2009 > 156 > 6 > 1149-1158

Several marine holoplanktonic organisms show a high degree of geographically structured diversity for which it often remains unclear to what extent this differentiation is due to the presence of cryptic taxa. For the genetically distinct diatom Pseudo-nitzschia pungens var. pungens, we used six microsatellite markers to investigate the spatial and temporal genetic composition in the heterogeneous...

article

Pseudo-nitzschia pungens (Bacillariophyceae): A cosmopolitan diatom species?

Griet Casteleyn, Victor A. Chepurnov, Frederik Leliaert, David G. Mann, more

Harmful Algae > 2008 > 7 > 2 > 241-257

Genetic, reproductive and morphological variation were studied in 193 global strains of the marine diatom species Pseudo-nitzschia pungens (Grunow ex Cleve) Hasle to assess potential intraspecific variation and biogeographic distribution patterns. Genetic differentiation between allo- and sympatric strains was investigated using the ITS1–5.8S–ITS2 rDNA region. Three ITS clades were found. Clones of...

article

Genetic Divergence and Reproductive Barriers among Morphologically Heterogeneous Sympatric Clones of Eunotia bilunaris Sensu Lato (Bacillariophyta)

Pieter Vanormelingen, Victor A. Chepurnov, David G. Mann, Koen Sabbe, more

Protist > 2008 > 159 > 1 > 73-90

The study of reproductive isolation between populations, combined with estimates of genetic divergence, provides important insights into mechanisms of speciation. In this study, sixteen morphologically heterogeneous sympatric clones of Eunotia bilunaris sensu lato (Bacillariophyta) were brought into culture to study their phylogenetic relationships and pre- and postzygotic reproductive barriers. An...

article

Effects of food diversity on diatom selection by harpacticoid copepods

Marisa Wyckmans, Victor A. Chepurnov, Ann Vanreusel, Marleen De Troch

Journal of Experimental Marine Biology and Ecology > 2007 > 345 > 2 > 119-128

The diversity of species assemblages which occupy a basal position in the trophic pyramid (typically unicellular algae in aquatic environments) is known to influence the interaction with organisms of higher trophic levels. A laboratory feeding experiment was conducted with cultures of three benthic diatom species (Navicula phyllepta, Grammatophora marina and Cylindrotheca closterium) as primary producers...

article

Food patch size, food concentration and grazing efficiency of the harpacticoid Paramphiascella fulvofasciata (Crustacea, Copepoda)

Marleen De Troch, Mateja Grego, Victor A. Chepurnov, Magda Vincx

Journal of Experimental Marine Biology and Ecology > 2007 > 343 > 2 > 210-216

Harpacticoid copepods are known as important grazers on primary producers. The underlying factors for their food selectivity and grazing efficiency are however far from well known. For instance, their patchy distribution in the marine environment is well documented but how meiofaunal organisms cope with the spatial distribution/accessibility of the available food resources is less clear.In the present...

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