David Marius Kroeck

David Marius Kroeck
Université de Lille · Evo-Eco-Paléo

Doctor of Philosophy

About

16
Publications
2,488
Reads
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58
Citations
Citations since 2017
16 Research Items
58 Citations
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
Additional affiliations
June 2016 - July 2016
NIOZ Royal Netherlands Institute for Sea Research
Position
  • Trainee
Description
  • Internship in marine geology lab: study of deep marine sediment cores from a submarine canyon, including: - X-radiography - X-ray fluorescence analysis with XRF corescanner - bulk particle size analysis with laser diffraction particle sizer - dating with radio-isotope 210Pb measured via alpha spectrometry - trace metal analysis by ICP-MS additional work: assistance in culturing experiments of shallow-marine benthic foraminifera
Education
October 2013 - March 2016
University of Bonn
Field of study
  • Geosciences
October 2010 - September 2013
University of Bonn
Field of study
  • Geosciences

Publications

Publications (16)
Article
In our recent publication on the biodiversity of Paleozoic phytoplankton (Kroeck et al., 2022) we cited several works of Martin (Martin, 1996; Martin and Quigg, 2012; Martin and Servais, 2020) to present the hypothesis that during the late Paleozoic nutrient availability in the oceans increased significantly from a rather (super-) oligotrophic earl...
Article
The oldest reported occurrence of cryptospores supposed to derive from land plants (embryophytes) is currently considered to be in the Middle Ordovician. The two genera Virgatasporites and Attritasporites, described in the 1960ʹs from the Early Ordovician (Tremadocian) of Algeria, are morphologically close to the miospores, and therefore pose a dil...
Article
Phytoplankton form the base of most marine trophic chains and studying their past diversity at regional and global scales can provide valuable insights into the evolution of marine ecosystems and climate history. Using a new database of more than 4000 species of acritarchs and prasinophytes, a comprehensive investigation of the taxonomic diversity...
Article
Diversification is a key property of life. Building on John Phillips' (1860) classic, iconic curve, Phanerozoic biodiversity trajectories have been based, subsequently, on the availability of additional and renewed sets of data and increasingly sophisticated analytical methods. Using relatively few single sources of data from global databases, the...
Article
Investigation of large populations of peteinoid acritarchs recovered from Middle Ordovician strata of the Hälludden and Horns Udde quarry sections (Öland, Sweden) allows for statistical analyses based on morphometric measurements. The results indicate the presence of assemblages with a continuous variability of morphotypes, thus a distinction of di...
Article
Full-text available
The latitudinal diversity gradient (LDG) — the decline in species richness from the equator to the poles — is classically considered as the most pervasive macroecological pattern on Earth, but the timing of its establishment, its ubiquity in the geological past, and explanatory mechanisms remain uncertain. By combining empirical and modeling approa...
Article
The oldest sediments of the Traras Mountains in northwestern Algeria have been analyzed palynologically. Several levels of the 'Formation des Psammites bioturbés' provide few specimens of poorly preserved acritarchs, that nevertheless allow a stratigraphic attribution of the investigated section to the Middle to Upper Ordovician, due to the presenc...
Article
After its first description in Cambrian–Ordovician boundary strata from Gondwana, the acritarch genus Vulcanisphaera Deunff, 1961 has been found subsequently on most other paleocontinents, with total 32 species assigned to this genus. A comprehensive revision of the published literature indicates that the genus contains only three species that are...
Article
The acritarch genus Orthosphaeridium Eisenack 1968 is one of the most frequently recorded acritarch taxa in the Ordovician. The taxonomy of this easily recognizable genus is revised herein based on a detailed literature review and on new investigations of palynological material from northeastern Iran and South China. The review confirms that Baltis...
Thesis
The phytoplankton play a major part in Earth’s ecosystems. They constitute a large part of the base of marine foodchains and therefore represent the starting point for most biological activity in the oceans. Moreover, phytoplanktic organisms are responsible for most photosynthetic activity on Earth, producing at least half the amount of oxygen, and...
Article
There are few publications on the precise age and palaeogeography of the Palaeozoic rocks of Colombia. In the present study the Pluspetrol Paisa-1 well, located in the central part of the Colombian Llanos Orientales Basin, is investigated palynologically, in order to determinate the age, the palaeoenvironment and the palaeogeography of the sediment...
Conference Paper
Full-text available
The classification of acritarchs remains a major problem concerning the study of this group, which is considered as representing a major part of the organic-walled phytoplankton of the Palaeozoic. It can be assumed that a large part of the taxa described in literature are not real biological entities but rather represent different (eco-) phenotypes...

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