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Amsterdam-Zuidoost, Netherlands

Rijsdijk K.F.,Institute of Biodiversity and Ecosystem Dynamics | Kroon I.C.,Applied Scientific Research | Meijer T.,WMC Kwartair Consultants | Meijer T.,Netherlands Center for Biodiversity | And 5 more authors.
Journal of Quaternary Science | Year: 2013

Mapping the Middle to Upper Pleistocene Rhine-Meuse sequence in the southern North Sea based on new core and seismic data has allowed a detailed palaeoenvironmental re-assessment. An integrated seismo-lithostratigraphic and malacological biostratigraphic framework is correlated with the optically stimulated luminescence-dated Rhine-Meuse sequence onshore. The data point to a dynamic interplay of fluvial and marine systems in the southern part of the North Sea driven by longer-term (>100 ka) tectonic and epeirogenic processes and shorter-term (<10 ka) climatic processes. The final permanent breaching of the Cretaceous chalk at the Strait of Dover during the Saalian (Marine Isotope Stage 6, MIS 6) ice age led to the formation of the 'Eurogeul' belt, a gravelly sand belt that represents the largest concentration of gravelly fluvial sediments in the southern North Sea. The formation and preservation of the Rhine-Meuse sequence is related to long-term (>100 ka) uplift of the Wealden-Artois synclinorium and compaction-driven subsidence of Tertiary shales within the Voorne Trough. The dominant erosive sedimentary signatures within the Rhine-Meuse sequence resulted through shorter-term (<10 ka) interplay of Pleistocene transgressions, glaciations and the permanent breaching of the Cretaceous chalk at the Strait of Dover by the Palaeo-Channel river during the Saalian (MIS 6). © 2013 John Wiley & Sons, Ltd. Source

Heinrichs G.,RWTH Aachen | De Hoog G.S.,Centraalbureau voor Schimmelcultures Fungal Biodiversity Center | De Hoog G.S.,Institute of Biodiversity and Ecosystem Dynamics | Haase G.,RWTH Aachen
Journal of Clinical Microbiology | Year: 2012

Herpotrichiellaceous black yeasts and relatives comprise severe pathogens flanked by nonpathogenic environmental siblings. Reliable identification by conventional methods is notoriously difficult. Molecular identification is hampered by the sequence variability in the internal transcribed spacer (ITS) domain caused by difficult-to-sequence homopolymeric regions and by poor taxonomic attribution of sequences deposited in GenBank. Here, we present a potential solution using short barcode identifiers (27 to 50 bp) based on ITS2 ribosomal DNA (rDNA), which allows unambiguous definition of species-specific fragments. Starting from proven sequences of ex-type and authentic strains, we were able to describe 103 identifiers. Multiple BLAST searches of these proposed barcode identifiers in GenBank revealed uniqueness for 100 taxonomic entities, whereas the three remaining identifiers each matched with two entities, but the species of these identifiers could easily be discriminated by differences in the remaining ITS regions. Using the proposed barcode identifiers, a 4.1-fold increase of 100% matches in GenBank was achieved in comparison to the classical approach using the complete ITS sequences. The proposed barcode identifiers will be made accessible for the diagnostic laboratory in a permanently updated online database, thereby providing a highly practical, reliable, and cost-effective tool for identification of clinically important black yeasts and relatives. Copyright © 2012, American Society for Microbiology. All Rights Reserved. Source

Van Maanen R.,Institute of Biodiversity and Ecosystem Dynamics | Van Maanen R.,Vilentium University of Applied science | Broufas G.,Democritus University of Thrace | De Jong P.,Institute of Biodiversity and Ecosystem Dynamics | And 4 more authors.
Ecological Entomology | Year: 2015

1. To reduce the risk of being eaten by predators, prey alter their morphology or behaviour. This response can be tuned to the current danger if chemical or other cues associated with predators inform the prey about the risks involved. 2. It is well known that various prey species discriminate between chemical cues from predators that fed on conspecific prey and those that fed on heterospecific prey, and react stronger to the first. It is therefore expected that generalist predators are more successful in capturing a given prey species when they are contaminated with chemical cues from another prey species instead of cues from the same prey species. 3. Here, a generalist predatory mite was studied that feeds on thrips larvae as well as on whitefly eggs and crawlers. Mites were marked with cues (i.e. body fluids) of one of these two prey species and were subsequently offered thrips larva. 4. Predators marked with thrips cues killed significantly fewer thrips than predators marked with whitefly cues, even though the predator's tendency to attack was the same. In addition, more thrips larvae sought refuge in the presence of a predatory mite marked with thrips cues instead of whitefly cues. 5. This suggests that generalist predators may experience improved attack success when switching prey species. © 2014 The Royal Entomological Society. Source

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