Royal Netherlands Institute for Sea Research
Royal Netherlands
Institute for Sea Research
Phone number
+31 (0)222 369 452
Guest researcher
Rijksuniversiteit Groningen
Theunis Piersma

Eva Kok

Guest researcher


  • Development of individual differences
  • Ontogeny of Migratory routines
  • Tracking local and migratory movements
  • Wadden Sea, Red Knots

Research Interests

I am a PhD student at the University of Groningen and Royal Netherlands Institute for Sea Research (NIOZ). I am based at the Coastal Systems group at NIOZ where I work under the supervision of Theunis Piersma. In my project I focus on the role of development in shaping of individuals in Red Knots Calidris canutus.

During my Biology studies at the UvA (Amsterdam) I got involved with the shorebird work when I joined an expedition to Mauritania during one of my master projects in 2012. Since then I’ve been enchanted by migratory birds and the extreme performances they display while migrating long distances and inhabit inhospitable areas.

In 2014 I started my PhD research at NIOZ. Building on a great amount of knowledge gained by my predecessors studying Red Knots, I’m working on the ontogeny of different physiological and behavioural traits including the development of migratory routes.








Professional education



Awards and Prizes

2016: Poster Price at the International Wader Study Group conference in Cork, Ireland




2018: De Eilanden Het Wad, met Midas Dekkers 


2018: Tracking Red Knots in the East Asian - Australasian Flyway in NW Australia


Linked news

Tuesday 11 June 2019
Trekvogel kanoet verandert wel zijn maag, niet zijn gedrag
Het gezegde dat een vos wel zijn haren maar niet zijn streken verliest, lijkt enigszins van toepassing op kanoeten, trekvogels die in voor- en najaar de Waddenzee bezoeken om zich er vol te eten. Onderling verschillen de individuele vogels vooral in…
Tuesday 20 September 2016
Eva Kok wins poster prize at Wader Study Group Symposium
Paula the Pioneer: One tagged knot commutes from the Wadden Sea to its Canadian Arctic breeding ground and finally shows us the details of its migration route.
Wednesday 20 July 2016
From Canadian breeding grounds to Wadden Sea
On Friday morning, 'Paula', a red knot mounted with a very small satellite transmitter, landed on de Boschplaat on the island of Terschelling, The Netherlands. She did so after leaving the most northerly breeding grounds on Earth in a non-stop flight…

Linked blogs

Monday 21 August 2017
Waddentrekkers | Wadden Flyways 8 | Paula is weer thuis
Er gaat niets boven een visuele waarneming. De afgelopen weken heeft de zender van kanoet Paula signalen verstuurd vanuit Canada, Groenland, het noorden van Schotland en de Duitse Waddeneilanden Sylt en Borkum. Uiteindelijk kwamen de signalen deze…
Thursday 03 August 2017
Waddentrekkers | Wadden Flyways 7
De gezenderde kanoet 'Paula' is weer 'gezien', dat wil zeggen de zender heeft weer signalen uitgezonden. Wat is er allemaal gebeurd sinds het laatste contact? | Knot 'Paula' has been 'seen' again, that is her transmitter has transmitted signals .…
Wednesday 07 June 2017
Waddentrekkers | Waddenflyways 5
Knot Paula: Ellesmere Island, touch down!

NIOZ publications

  • 2019
    Kok, E.M.A.; Burant, J.B.; Dekinga, A.; Manche, P.; Saintonge, D.; Piersma, T.; Mathot, K.J. (2019). Within-individual canalization contributes to age-related increases in trait repeatability: a longitudinal experiment in red knots. American Naturalist 194(4).
    Mathot, K.J.; Kok, E.M.A.; Burant, J.B.; Dekinga, A.; Manche, P.; Saintonge, D.; Piersma, T. (2019). Evolutionary design of a flexible, seasonally migratory, avian phenotype: why trade gizzard mass against pectoral muscle mass? Proc. - Royal Soc., Biol. Sci. 286(1903): 20190518.