A5090920194- Diatoms and Algae Research
- Aquatic Invertebrate Ecology and Behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Genomics and Phylogenetic Studies
- Environmental DNA in Biodiversity Studies
- Fish Ecology and Management Studies
- Forest Insect Ecology and Management
- Protist diversity and phylogeny
- Horticultural and Viticultural Research
- Water Quality Monitoring and Analysis
- Botany and Plant Ecology Studies
- Invertebrate Taxonomy and Ecology
Leiden University
2022
In contrast to surveys based on a few genes that often provide limited taxonomic resolution, transcriptomes wealth of genomic loci can resolve relationships among taxonomically challenging lineages. Diatoms are diverse group aquatic microalgae includes important bioindicator species and many such One example is Nitzschia palea , widespread complex with several morphologically defined varieties, some which critical pollution indicators. Morphological differences the varieties subtle...
SUMMARY 1. Samples for the analysis of attached diatoms and surface water chemistry were taken at thirty‐five stations in sixteen soft‐water streams Netherlands during autumn 1990. Most located pine forest heathland catchments, fed by deep groundwater (median residence time 87 years), with no direct influence agricultural or urban drainage water. 2. The chemical data from compared collected 1974 1981. There significant increases pH (6.3 1974, 6–4 1990) sulphate (200 mmol m −3 229 1990). Over...
Four new Achnanthidium species belonging to the complex around A. minutissimum (Kutz.) Czarn. are described from different localities in Europe. hoffmannii Van de VijVer, eCtor, a. Mertens et jarlMan nov. spec. was found several oligotrophic, circumneutral rivers Sweden. The is characterized by presence of irregular, slit-like areolae near valve margin, clearly visible LM. acerosum lange-Bert. spec., a narrow, linearlanceolate with protracted, narrowly capitate apices, likewise Sweden, but...
During a survey of some springs in the French Central Massif, new Navicula species (Bacillariophyceae) was found: sanctamargaritae Beauger sp. nov. A second observed during routine biomonitoring project Flanders: flandriae Van de Vijver & A.Mertens nov.. The are formally described using light and scanning electron microscopy. Both present unique set morphological characters including structure central raphe endings, striation pattern, valve dimensions outline, which allows their...
Since 1926, the subalpine Lake Orta has become acidified through nitrification of ammonia released by a cupro-ammonia rayon factory. The present pH is ca 5.2 and copper concentrations are 35 μg 1−1. In 1987–8 most abundant epilithic diatoms at two stations were Eunotia exigua Achnanthes minutissima, which known to be tolerant heavy metals, Pinnularia subcapitata var. hiheana; average inferred from assemblages 4.9. Critical examination published accounts diatom flora, taking into account...
During a routine biomonitoring project of the water quality in rivers and brooks Flanders, Belgium, an unusual Ulnaria taxon was found that could not be identified using currently available literature. Based on detailed light scanning electron microscopy observations, unknown is described as new to science: verhaegeniana sp. nov. The can distinguished by its parallel margins, abruptly tapering valve apices, relatively modest dimensions with width < 6 µm very large, apically elongated,...
Despite being one of the dominant groups in diatom flora our rivers and lakes, correct taxonomic identity several Fragilaria Lyngb. taxa (formerly genus Synedra Ehrenb.) is often blurred by insufficient knowledge different morphological types. The present paper illustrates discusses former using both light scanning electron microscope observations. Based on analysis, deformis W.Sm. transferred to as (W.Sm.) Van de Vijver & Ector, comb. nov. A second species, S. vaucheriae var. Grunow,...
During an extensive analysis of the diatom flora Port Antwerp (Belgium) in 2008, unknown naviculoid taxon was observed. Detailed morphological investigations using light, scanning electron and transmission microscopy resulted description this as Olifantiella elisabethiana Van de Vijver sp. nov. This new small-celled, biraphid species is characterized having a typical internal process named buciniportula, opening externally by pore or slit, unseriate striae composed one single transapically...
A new cymbelloid diatom species, Encyonopsis neerlandica sp. nov., is described from several moorland pools The Netherlands. species belongs to the complex of around E. microcephala. Based on light and detailed scanning electron microscopy, morphology discussed compared similar this complex. characterized by its rather large valve dimensions, narrowly clearly lanceolate outline with convex weakly margins rostrate subcapitate apices. distal raphe fissures are ventrally deflected. There a...
Eunotia paludosa is an abundant and frequent diatom species in ombrotrophic, Sphagnum-dominated bog ponds Europe. Analysis of the type material from Mandling, Austria, revealed that our currently accepted concept E. paludosa, based on morphology, was incorrect. The valves population possess distinct, relatively large, acute spines dorsal margin, which are not present what understood under paludosa. Based comparison with material, three new described. sphagnicola encompasses all European...
Abstract Background Diatoms are present in all waters and highly sensitive to pollution gradients. Therefore, they ideal bioindicators for water quality assessment. Current indices used these applications based on identifying diatom species counting their abundances using traditional light microscopy. Several molecular techniques have been developed help automate different steps of this process, but obtaining reliable estimates community composition abundance remains challenging. Results...
Abstract In contrast to surveys based on a few genes that often provide limited taxonomic resolution, transcriptomes wealth of genomic loci can resolve relationships among taxonomically challenging lineages. Diatoms are diverse group aquatic microalgae includes important bioindicator species and many such One example is Nitzschia palea , widespread complex with several morphologically varieties, some which critical pollution indicators. Morphological differences the varieties subtle...
Abstract Background: Diatoms are present in all waters and highly sensitive to pollution gradients. Therefore, they ideal bioindicators for water quality assessment. Current indices used these applications based on identifying diatom species counting their abundances using traditional light microscopy. Several molecular techniques have been developed help automate different steps of this process, but obtaining reliable estimates community composition abundance remains challenging. Results:...