Marcel Polling

Wageningen University & Research | WUR · Wageningen Enviromental Research

Pollen classification is considered an important task in palynology. In the Netherlands, two genera of the Urticaceae family, named Parietaria and Urtica, have high morphological similarities but induce allergy at a very different level. Therefore, distinction between these two genera is very important. Within this group, the pollen of Urtica membr...

Biological particles suspended in the atmosphere have a crucial role in the dynamics of the biosphere underneath. Although much attention is paid for the chemical and physical properties of these particles, their biological taxonomic identity, which is relevant for ecological research, remains little studied. We took air samples at 300 meters above...

Op de hogere zandgronden treedt verminderde vitaliteit en sterfte van eikenbomen op, vooral door verzuring en vermesting. Toediening van steenmeel zou kunnen helpen tegen de nadelige effecten van verzuring. Daarom zijn in 2016 in Het Nationale Park De Hoge Veluwe en in het Mastbos (Breda) experimenten gestart met steenmeeltoediening. Na zes jaar on...

The study of faecal samples to reconstruct the diets and habitats of extinct megafauna has traditionally relied on pollen and macrofossil analysis. DNA metabarcoding has emerged as a valuable tool to complement and refine these proxies. While published studies have compared the results of these three proxies for sediments, this comparison is curren...

Airborne pollen monitoring is of global socio-economic importance as it provides information on presence and prevalence of allergenic pollen in ambient air. Traditionally, this task has been performed by microscopic investigation, but novel techniques are being developed to automate this process. Among these, DNA metabarcoding has the highest poten...

Monitoring of airborne pollen concentrations provides an important source of information for the globally increasing number of hay fever patients. Airborne pollen is traditionally counted under the microscope, but with the latest developments in image recognition methods, automating this process has become feasible. A challenge that persists, howev...

Monitoring of airborne pollen concentrations provides an important source of information for the globally increasing number of hay fever patients. Airborne pollen are traditionally counted under the microscope, but with the latest developments in image recognition methods, automating this process has become feasible. A challenge that persists, howe...

Several studies indicate that North Atlantic Deep Water (NADW) formation might have initiated during the globally warm Eocene (56–34 million years ago; Ma). However, constraints on Eocene surface ocean conditions in source regions presently conducive to deep‐water formation are sparse. Here we test whether ocean conditions of the middle Eocene Labr...

What combination of DNA metabarcoding primers works best to reconstruct changing species composition of Arctic vegetation over time? How do pollen, macro-fossil and DNA results from Pleistocene coprolites compare?

Recent data shows increasing numbers of hay fever patients, with approximately 10-30% of the population affected worldwide (Pawankar et al. 2011). This increase is most likely caused by prolonged and intensified pollen seasons which in turn have been linked to increased CO 2 concentrations (Ziska et al. 2003, D'Amato et al. 2007, Albertine et al. 2...

Hydrocarbon exploration in the deep-water GoM (Gulf of Mexico) has fuelled increased investment into the potential for palynology to answer fundamental stratigraphic and depositional problems offshore especially since the calcareous nanno- and microfossils are sparse in these plays. Pollen and spore floras are abundant and rich in the Midway, Wilco...

Recent studies have shown that the Early Eocene Climatic Optimum (EECO) was preceded by a series of short-lived global warming events, known as hyperthermals. Here we present high-resolution benthic stable carbon and oxygen isotope records from ODP Sites 1262 and 1263 (Walvis Ridge, SE Atlantic) between ~ 54 and ~ 52 million years ago, tightly cons...

Recent studies have shown that the Early Eocene Climatic Optimum (EECO) was preceded by a series of short-lived global warming events, known as hyperthermals. Here we present high-resolution benthic stable carbon and oxygen isotope records from ODP Sites 1262 and 1263 (Walvis Ridge, SE Atlantic) between ~54 and ~52 million years ago, tightly constr...

The Paleocene–Eocene Thermal Maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean–atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean w...

The Late Paleocene- Early Eocene warming trend (55-50 Ma) is marked by a series of short-lived global warming events, known as hyperthermals. The Paleocene-Eocene Thermal Maximum, (PETM), is the most pronounced, followed by the ETM2 (Elmo) and the ETM3 ("X-event") up to the Early Eocene Climatic Optimum (EECO). These transient greenhouse episodes a...

The Paleocene-Eocene thermal maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean-atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean w...

The Paleocene-Eocene thermal maximum (PETM) represents a ~170kyr episode of anomalous global warmth ~55.8 Myr ago, with the onset being marked by a geologically abrupt negative carbon isotope excursion (CIE) in both marine and continental sedimentary components. Reflecting the massive release of 13C-depleted carbon into the ocean and atmospheric sy...

Increasingly high resolution isotope- and novel organic geochemical proxy records have revealed that the long-term cooling trend of the middle Eocene was interrupted by a warming phase designated the Middle Eocene Climatic Optimum (MECO). It is suggested to represent an increase in sea surface temperatures of about 4°C, lasting approximately 400 k...