Utrecht University has great ambitions for its teaching quality and study success rates. This also applies to its clear research profiles which are centred around four themes: Dynamics of Youth, Institutions, Life Sciences and Sustainability. Utrecht University plays a prominent role in our society and contributes to finding the answers to topical and future societal issues. Everyone deserves to feel at home at our university. We welcome employees with a wide variety of backgrounds and perspectives.

PhD position on Conservation paleobiology of toothed whales of the North Atlantic (4 years)

The Department of Earth Science at Utrecht University looking for a candidate to fill a prospective PhD position in the project Conservation paleobiology of toothed whales of the North Atlantic carried out in collaboration with the Department of Biomolecular Health Sciences (Faculty of Veterinary Medicine). This project will apply geochemical methods to unravel changes in the habitat and ecology of toothed whales in the North Sea during the last millennia, focusing on the anthropogenic impact.

Whales are critical organisms in the Earth's ocean ecosystems. Increased shipping, the construction of off-shore wind farms and rising sea temperatures have decimated their populations. Because whales have long lifespans and migrate over large areas, we do not have an ecological baseline to evaluate their population dynamics and shrinking of habitats. Such information is, however, available in the historical (the last few centuries old) and fossil whale remains in the North Sea. Geoscientific expertise can aid conservation by unlocking environmental and ecological records from these remains. In this project we will focus on whale teeth, as teeth are often the only part of the organism which becomes preserved. Owing to its chemical stability, tooth enamel preserves environmental information of the organism's diet, migrations and temperature.

Objectives of the project:

  1. Identification of the mechanism of alteration of O and Sr isotopic and trace element composition of whale enamel in marine diagenetic conditions?
  2. quantifying changes in the crystallographic texture caused by alteration?
  3. formulating a screening protocol allowing to identify pristine proxy values or correct for altered proxy values in enamel?
  4. reconstructing migrations and trophic and thermal niches of Pleistocene North Atlantic whales using the methodology developed in this project.


Your tasks will be to sample whale teeth from fossil collections in museums and from recently stranded and deceased whales at the Faculty of Veterinary Medicine. The animals keep their teeth throughout their lives. We will target sperm whales and harbour porpoises, as both species are of acute interest in terms of population decline, but they represent different ecologies. You will carry out isotopic, elemental and mineralogical analyses, as well as experimental diagenesis, on modern teeth. In parallel to laboratory work, you will compile information on the distribution and ecology of sperm whales and harbour porpoises in the North Sea to evaluate how well the geochemical proxies reflect this knowledge. Based on the results of experimental diagenesis, you will evaluate whether these proxies can be applied to fossil whale teeth and you will carry out a proxy reconstruction in fossil specimens to compare the ecological information with modern whales. If material from tagged animals can be obtained, it will allow cross-testing our reconstructions.

The position is funded by the Geosciences Strategic Themes programme awarded to Emilia Jarochowska (Geosciences) and Lonneke IJsseldijk (Veterinary Medicine). It includes a work contract for four years, as well as a budget for research, travel and publication expenses to support the PhD project. The project will involve collaboration with Helen King (Raman spectroscopy, biomineralisation), Lubos Polerecky (NanoSIMS) and Philip Riekenberg (Royal NIOZ, whale ecology).

You will be based at Utrecht University, but the project foresees travel for training, research collaboration, and meeting with project partners.


Required qualifications:

  • You must hold a Master's degree in Biology, Earth Sciences, Marine Geology, Marine Ecology, Marine Biology, Ecology, Environmental Science or a closely related field.
  • You must have excellent written and spoken English skills and be highly motivated to work in an international team.
  • You have previous experience in laboratory work.
  • You can demonstrate computer skills related to data analysis, handling and presentation, such as applying basic statistical tests, preparing graphs, reporting quantitative data.

Desired qualifications:

  • You have experience with numerical modelling of non-linear systems and fluid rheology/dynamics
  • You have experience with independent use of multiple programming languages such as Python or Fortran.
  • You can demonstrate familiarity with quantitative methods and concepts in micro-physics, materials science, and material rheology.

Terms of employment:

You will be offered a temporary position initially for one year with an extension to a total of four years upon a successful assessment in the first year, and with the specific intent that it results in a doctorate within this period. The gross salary ranges between €2,541 in the first year and €3,247 in the fourth year of employment (scale P according to the Collective Labour Agreement Dutch Universities) per month for a full-time employment. Filling the position 0.8 FTE is optional.

Salaries are supplemented with a holiday bonus of 8% and an end-of-year bonus of 8,3% per year. Utrecht University offers excellent secondary conditions, including an attractive retirement scheme, (partly paid) parental leave and flexible employment conditions (multiple choice model). For more information, please visit working at Utrecht University. Facilities for childcare and sports are available on campus.

About the organisation:

Utrecht University's Faculty of Geosciences studies the Earth from the Earth's core to its surface, including man's spatial and material utilisation of the Earth, always with a focus on sustainability and innovation. With a population of 3,400 students (BSc and MSc) and 720 staff, the Faculty is a strong and challenging organisation. The Faculty is organised in four Departments: Earth Sciences, Physical Geography, Sustainable Development, and Human Geography & Spatial Planning.

The Department of Earth Sciences conducts teaching and research across the full range of the solid Earth and environmental Earth sciences, with activities in almost all areas of geology, geochemistry, geophysics, biogeology and hydrogeology. The department hosts a highly international tenured staff of about 50 scientists and more than 110 PhD students and postdoctoral researchers. Our research programme spans four intertwined themes: Climate & Life, Earth interior, Earth materials, and Environmental Earth Sciences. We house or have access to a wide variety of world-class laboratories.

About Utrecht:

Utrecht is the fourth largest city in the Netherlands with a population of nearly 360,000 and forms a hub in the middle of the country. Its historic city centre and its modern central station can easily be reached from the Utrecht Science Park by public transport or by a 15-minute bicycle ride. Utrecht boasts beautiful canals with extraordinary wharf cellars housing cafés and terraces by the water, as well as a broad variety of shops and boutiques.

Additional information:

For informal questions, please contact Dr Emilia Jarochowska (project leader) via e.b.jarochowska@uu.nl.

How to apply:

To apply, please follow this link and the guidelines mentioned there. The application deadline is March 31st, 2023. We aim for a quick process of evaluations and online interviews in the first half of April. The intended starting date is May 1st, 2023, but it is flexible.

Please note that international candidates that need a visa/work permit for the Netherlands require at least four months processing time after selection and acceptance. This will be arranged with help of the International Service Desk (ISD) of our university. Finding appropriate housing in or near Utrecht is your own responsibility, but the ISD may be able to advise you therewith. In case of general questions about working and living in The Netherlands, please consult the Dutch Mobility Portal.

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posted: 22 February 2023     Please mention EARTHWORKS when responding to this advertisement.