- Development of individual differences
- Ontogeny of Migratory routines
- Tracking local and migratory movements
- Wadden Sea, Red Knots
Eva Kok
Research Interests
I am a behavioural ecologist with a passion for birds and marine ecosystems. I’m fascinated with understanding why individuals behave the way they do. Known causes of intraspecific variation in behaviour include previous exposure to varying environmental factors and differences in internal state (both the physiologically and psychological state). Understanding an individual’s motivation to act may play a key role in predicting a species response to change.
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My research primarily focusses on unraveling causes and consequences of consistent among-individual variation in migratory behaviour in Red Knots (Calidris canutus). Red knots are shorebirds that annually migrate between their arctic breeding grounds and their southern intertidal wintering areas. A major axis of my research is focused on understanding intraspecific variation of their migratory routines. I am especially interested in the role of experience (= a developmental cognitive process) in shaping individual variation in behaviour. Because, understanding the influence of experience in the shaping individual migratory routines may play a key role in predicting the species response to Global Change. To unravel underlying mechanisms leading to individual variation in behaviour I combine experimental work, field observation and satellite tracking of individuals.
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Postdoc: ‘Phenological and behavioural responses to climate change in migratory shorebirds’
In my current postdoc project, I joined Jan van Gils and his team to investigate how global warming affects red knots from their Arctic breeding grounds to their tropical wintering areas and back.
All too briefly: Due to global warming, which is especially strong at higher latitudes, the Arctic summer has advanced by almost a month in the past decades. As a result, the emergence of insects (the main prey for red knot chicks) has also advanced and this seems to induce a so-called ‘tropic mismatch’, with red knot chicks growing up after the peak food supply. Read more about this VICI-funded project.
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I recently received my PhD from the University of Groningen. The aim of my thesis ('Why Knot? Exploration of Variation in Long-Distance Migration) was to increase understanding of the development of individual migratory routines. To that extend I first explored individual variation in migratory behaviour present in wild red knots (Calidris canutus) using a novel solar-powered satellite transmitter. Second, I investigated how differences in experience effect the development of physiological and behavioural traits in birds temporarily held in captivity. By combining these results I show that environmental conditions play a key role in shaping individual migratory routines.
This work was done at NIOZ under supervision of Theunis Piersma and Kimberley Mathot. A pdf of my thesis can be downloaded here.
Functions
2020-current: Postdoctoral researcher at NIOZ
2014-2020: PhD student at NIOZ and University of Groningen (click here for more information).
Key-publications
Please find my complete list of NIOZ-publications at the bottom of this webpage. You can also find all my publications on Research Gate.
Professional education
Awards and Prizes
2016: Poster Price at the International Wader Study Group conference in Cork, Ireland
Links
Media
2023: TV programma BinnensteBuiten
2021: De trekvogel als vliegende spion. Lezing voor Studium Generale (Universiteit Utrecht) in de Botanische Tuinen van Utrecht.
2020: Bioscoop film Silence of the Tides
2018: De Eilanden Het Wad, met Midas Dekkers
Blogs
2021: Eos blog: Hoe we twee trekvogels volgden van Sahara tot Noordpool
2018: Tracking Red Knots in the East Asian - Australasian Flyway in NW Australia
Linked news
Linked blogs
NIOZ publications
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2023
Nuijten, R.J.M.; Katzner, T.E.; Allen, A.M.; Bijleveld, A.I.; Boorsma, T.; Börger, L.; Cagnacci, F.; Hart, T.; Henley, M.A.; Herren, R.M.; Kok, E.M.A.; Maree, B.; Nebe, B.; Shohami, D.; Vogel, S.M.; Walker, P.; Heitkönig, I.M.A.; Milner-Gulland, E.J. (2023). Priorities for translating goodwill between movement ecologists and conservation practitioners into effective collaboration. Conservation Science and Practice 5(1): e12870. https://dx.doi.org/10.1111/csp2.12870
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2021
Piersma, T.; Kok, E.M.A.; Hassell, C.J.; Peng, H.-B.; Verkuil, Y.I.; Lei, G.; Karagicheva, J.; Rakhimberdiev, E.N.; Howey, P.W.; Tibbitts, T.L.; Chan, Y.-C (2021). When a typical jumper skips: itineraries and staging habitats used by Red Knots (Calidris canutus piersmai) migrating between northwest Australia and the New Siberian Islands. Ibis 163(4): 1235-1251. https://doi.org/10.1111/ibi.12964
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2020
Kok, E.M.A. (2020). Why Knot? Exploration of variation in long-distance migration. PhD Thesis. University of Groningen: Groningen. 281 pp. https://hdl.handle.net/11370/7124b7a7-5eb2-4513-8299-ddff071b069bKok, E.M.A.; Hogan, J.A.; Piersma, T. (2020). Experimental tests of a seasonally changing visual preference for habitat in a long‐distance migratory shorebird. Ethology 126(7): 681-693. https://dx.doi.org/10.1111/eth.13036Kok, E.M.A.; Tibbitts, T.L; Douglas, D.C.; Howey, P.W.; Dekinga, A.; Gnep, B.; Piersma, T. (2020). A red knot as a black swan: how a single bird shows navigational abilities during repeat crossings of the Greenland Icecap. J. Avian Biol. 51(8). https://dx.doi.org/10.1111/jav.02464Mathot, K.J.; Kok, E.M.A.; van den Hout, P.J.; Dekinga, A.; Piersma, T. (2020). Red knots (Calidris canutus islandica) manage body mass with dieting and activity. J. Exp. Biol. 223(21): jeb231993. https://doi.org/10.1242/jeb.231993
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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). https://dx.doi.org/10.1086/704593Mathot, 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. https://dx.doi.org/10.1098/rspb.2019.0518
Linked projects
