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Personal profile

Personal information

Department of Ecological Science
Faculty of Science
Vrije Universiteit
De Boelelaan 1085
1081 HV Amsterdam
Office: W&N-H147
E-mail: joris.koene@vu.nl
Departmental website
Research group website


The main interest of my research group revolves around reproduction in simultaneous hermaphrodites. Many of the questions we address focus on issues of sperm competition and sexual conflict and attempt to integrate different biological levels (e.g., behaviour, evolution, ecology, physiology, neuro-endocrinology). We make use of a range of different techniques, among which quantification of behaviour and resource investment, molecular phylogeny reconstruction, paternity analysis, biochemical and genetic identification and analysis of pheromones and allohormones, immunohistochemistry, micro-surgery, neuroanatomy and physiological experiments. For many of our experiments we use the model species (great pond snail Lymnaea stagnalis), but we also use these findings in comparative approaches within freshwater snails. We also explore sexual conflicts caused by some of the more bizarre reproductive behaviours found in hermaphrodites, such as love darts and other strange sexual attributes. The latter includes the use of the model species Cornu aspersum and other land snails. Our aim is to integrate our findings into a complete and general picture of why and how sexual selection - in this case including sperm competition and sexual conflict - affects simultaneous hermaphrodites. Such a broad synthesis is expected to significantly contribute to a full understanding of hermaphroditism as a reproductive strategy.

Ancillary activities

  • Naturalis | Leiden | Research Associate | 2013-10-27 - present
  • Naturalis | Leiden | Research Associate | 2017-11-28 - present

Ancillary activities are updated daily

Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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Research Output 1997 2019

Increased copulation duration does not necessarily reflect a proportional increase in the number of transferred spermatozoa

Weggelaar, T. A., Commandeur, D. & Koene, J. M., 2019, In : Animal Biology. 69, 1, p. 95-115 21 p.

Research output: Contribution to JournalArticleAcademicpeer-review

sexual selection

Female behaviour prior to additional sperm receipt in the hermaphroditic pond snail Lymnaea stagnalis

Moussaoui, R., Verdel, K., Benbellil-Tafoughalt, S. & Koene, J. M., Apr 2018, In : Invertebrate Reproduction and Development. 62, 2, p. 82-91 10 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Lymnaea stagnalis

Intra-specific morphological variation of the spermatheca in the simultaneously hermaphroditic land snail Helix aperta

Abdelli, M., Benbellil-Tafoughalt, S. & Koene, J. M., Mar 2018, In : Zoomorphology. 137, 1, p. 51-61 11 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Helix (Snails)
sperm competition

Sexual Conflict in Nonhumans

Koene, J., 2018, Encyclopedia of Evolutionary Psychological Science. Shackelford, T. & Weekes-Shackelford, V. (eds.). Cham: Springer International Publishing Switzerland, p. 1 19 p.

Research output: Chapter in Book / Report / Conference proceedingChapterAcademicpeer-review

Open Access

The long and the short of it - a perspective on peptidergic regulation of circuits and behaviour

Jékely, G., Melzer, S., Beets, I., Kadow, I. C. G., Koene, J., Haddad, S. & Holden-Dye, L., 8 Feb 2018, In : Journal of Experimental Biology. 221, 3, p. 1-14 14 p., 166710.

Research output: Contribution to JournalReview articleAcademicpeer-review

Activities 2009 2009

  • 1 Editorial work

Animal Biology (Journal)

J.M. Koene (Reviewer)

Activity: Peer review and Editorial workEditorial workAcademic


Buschbaum Prize

J.M. Koene (Recipient), 2005


Dutch Zoology Prize

J.M. Koene (Recipient), 2008


Friedrich Wilhelm Bessel Research Award

J.M. Koene (Recipient), 2010


Jessup-McHenry Award

J.M. Koene (Recipient), 1999


Love darts of land snails

J.M. Koene (Recipient), 2005