Contact Information

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Function and attachment

Professor assistant at the Laboratory of  Benthic Ecogeochemistry UMR 8222 (Observatory of Oceanology of Banyuls sur Mer (Sorbonne University –CNRS)
Laboratoire d'écogéochimie des environnements benthiques (LECOB/CNRS-Sorbonne Université UMR 8222) Observatoire Océanologique de Banyuls.


Research interests:
- Biodiversity of meiofauna (morphological and meta-genetics/barcoding approaches)
- Ecology of meiofauna (distribution patterns, functional diversity, community structure)
- Role of meiofauna in energy and organic matter transfers in benthic food webs

Keywords: meiofauna, metabarcording, molecular approach, free-living–marine nematodes, marine biodiversity, biotic indices

Teaching field:
Ecology and biology of benthic animals, ecology and diversity of meiofauna and macrofauna (soft-bottom, coralligeneus and posidonia  meadows), biotic indices.

 Co-Coordinator of the courses:
- Ecology and biology of marine organisms (ECOBIOM)- Licence 2 / Sciences de la Vie/ Sorbonne University
- Mediterranean ecology (ECOMED) – Master 1 / Sciences de la Mer / Sorbonne University
- Concepts and practices in biological oceanography  2 - Biodiversity and Taxonomy (CPOB2) –  Master 1/Sciences de la Mer / Sorbonne University/ International Master of Sciences in Marine Biodiversity and Conservation (IMBRSea).
- Concepts and practices in biological oceanography 3- Ecology and methodology (CPOB3) –Master 1/ Master 1 Sciences de la Mer / Sorbonne University/ International Master of Sciences in Marine Biodiversity and Conservation (IMBRSea).
- Coastal ecosystem, ecology and functioning – Master 2 / Sciences de la Mer / Sorbonne University/ International Master of Sciences in Marine Biodiversity and Conservation (IMBRSea).
- Ecology of coastal communities (E2C) – Master 2 / Sciences de la Mer / Sorbonne University/ International Master of Sciences in Marine Biodiversity and Conservation (IMBRSea).

  • Associate Editors  in « Vie et Milieu »

PROMETHEE Project "Determination of the structure of the prokaryotic and micro-eukaryotic communities of the Lacaze-Duthiers canyon using an environmental genomic based approach (P.I., funder: APEGE-INEE CNRS).
- VERMEILLECOTOX Project (2012-2014) "Study of the spatio-temporal variations of trace elements flows and of the ecotoxicological quality of the Vermeille coast" (co. P.I., funders : UPMC/CNRS, AAMP, FEP, Agence de L'Eau).
- CHAIRE - Environnement marin extrême, biodiversité et changement global. (UPMC-Fondation TOTAL)
- TEMPO - Synchronisation des dynamiques temporelles des réseaux trophiques en milieu marin méditerranéen. (projet 80PRIME CNRS)
- IMPEC : Impact de la pêche sur les écosystèmes benthiques du large : Evaluation de l’impact de la pêche sur les habitats benthiques du circalittoral du large dans le Golfe du Lion : approche multi-indicateurs. (Agence Française pour la Biodiversité)


Present position since 2008: Assistant professor at Sorbonne University and at Laboratory of Benthic Ecogeochemistry UMR (Banyuls Marine Station, Sorbonne University –CNRS.
2006-2007: Research, Postdoctoral Investigator, National Museum of Natural History in Paris, France. Trophic sources of meiofauna.
2004 – 2005: Research and Teaching, Assistant professor (ATER), Pierre and Marie Curie University, France
2003-2004: Research and Teaching, Assistant professor (ATER), University of La Rochelle, France



Van der der Heijden LH, Graeve M, Asmus R, Rzeznik-Orignac J, Niquil N, Bernier Q, Guillou G, Asmus H, Lebreton B. 2019. Trophic importance of microphytobenthos and bacteria to meiofauna in soft-bottom intertidal habitats: A combined trophic marker approach. Marine Environmental Research 149:50–66. DOI: 10.1016/j.marenvres.2019.05.014.

Van der Heijden LH., Rzeznik-Orignac J., Asmus RM., Fichet D., Bréret M., Kadel P., Beaugeard L., Asmus H., Lebreton B. 2018. How do food sources drive meiofauna community structure in soft-bottom coastal food webs? Marine Biology 165. DOI: 10.1007/s00227-018-3419-7.

Rzeznik-Orignac J., Puisay A., Derelle E., Peru E., Le Bris N., Galand PE. 2018. Co-occurring nematodes and bacteria in submarine canyon sediments. PeerJ 6:e5396. DOI: 10.7717/peerj.5396.

Rzeznik-Orignac J., Kalenitchenko D., Mariette J., Bodiou J-Y., Le Bris N., Derelle E. 2017. Comparison of meiofaunal diversity by combined morphological and molecular approaches in a shallow Mediterranean sediment. Marine Biology 164. DOI: 10.1007/s00227-017-3074-4.

Charles F., Nozais C., Lantoine F., Rzeznik-Orignac J., Labrune C., Coston-Guarini J. 2016. Trophic ecology of coastal soft bottoms: a dive into the stew of marine sediment. Vie Milieu:8.

Rzeznik-Orignac J., Fichet D. 2012. Experimental estimation of assimilation rates of meiofauna feeding on 14C-labelled benthic diatoms. Journal of Experimental Marine Biology and Ecology 432–433:179–185. DOI: 10.1016/j.jembe.2012.06.019.

Rzeznik-Orignac J, Boucher G, Fichet D, Richard P (2008) Stable isotope analysis of food source and trophic position of intertidal nematodes and copepods. Mar Ecol Prog Ser 359:145-150.

Pascal, P.Y., Dupuy, C., Richard, P., Rzeznik-Orignac, J., Niquil, N.  2008. Bacterivory of a mudflat nematode community under different environmental conditions. Marine Biology. 154, 671–682.

Degré D. Leguerrier D. Armynot du Chatelet E. Rzeznik-Orignac J. Auguet J.C. Dupuy C. Marquis E. Fichet D. Struski C. Joyeux E. Sauriau P-G. & Niquil N. 2006. Comparative analysis of the food webs of two intertidal mudflats during two seasons using inverse modelling: Aiguillon Cove and Brouage Mudflat (France). Estuarine Coastal and Shelf Sciences, 69: 107-124

Rzeznik-Orignac J., Fichet D. & Boucher G. 2004. Extracting massive number of nematodes from muddy marine deposits: efficiency and selectivity. Nematology, 6: 605-616

Rzeznik-Orignac J. Fichet D. & Boucher G. 2003. Spatio-temporal structure of the nematode associations of the Brouage mudflat (Marennes Oléron). Estuarine Coastal and Shelf Sciences 58 : 77-88

Leguerrier D. Niquil N. Boileau N. Rzeznik-Orignac J. Sauriau P.-G. Le Moine O. & Bacher C. 2003. Numerical analysis of the food web of an intertidal mudflat ecosystem on the Atlantic coast of France. Marine Ecology Progress Series 246: 17-37

Skora K. E. & Rzeznik J. 2001. Observation on diet composition of Neogobius melanostomus Pallas 1811 (Gobiidae, Pisces) in in the Gulf of Gansk (Baltic Sea). Journal of Great Lakes Research. 27: 290-299.

Oral presentations:

Luuk van der Heijden, R. Asmus, M. Graeve, J. Rzeznik-Orignac, N. Niquil, M. Haraldsson, B.Saint-Béat, S. Pacella, D. Fichet, Q. Bernier, G. Guillou, P. Kadel, H. Asmus and B. Lebreton. Importance of the microphytobenthos-meiofauna pathway in soft-bottom intertidal food webs highlighted by trophic markers and food web modeling. . SeventIMCO,  17th International Meiofauna Conference, 7-12th July 2019, MARE-Marine Environmental Sciences Centre, Portugal

J. Rzeznik-Orignac. Specific and functional diversity of meiofauna in marine sediments.  Marine biodiversity, Ecosystem dynamics and Conservation. Observatoire Océanographique de Banyuls-sur-Mer.  2019, July 8-12

J. Rzeznik‐Orignac, D. Kalenitchenko, Antoine Puisay, E. Peru, J. Mariette, J‐Y Bodiou, N. Le Bris, E. Derelle, P. Galand. Molecular inventories of meiofaunal diversity and its application in ecological benthic studies ICES BEWG, Observatoire Océanographique de Banyuls-sur-Mer.  14-18 May 2018 

Le Bris N., Galand P., Kalenitcheko D., Lartaud F., Meistertzheim A. L., Rzeznik-Orignac J., Péru E., Pruski A.M., Rivière B., Vétion G. (2016). The Lacaze-Duthiers canyon: a natural laboratory to study deep-sea ecosystem dynamics and functions in a climate change context. 3rd INCISE International Submarine Canyon Symposium. 25-27 July 2016 Victoria, BC Canada.

Le Bris N., Galand P., Lartaud F., Rzeznik-Orignac J., Peru E., Kalenitchenko D., Pruski A., Rivière B., Vétion G. (2015). Climate sensitive deep-sea ecosystems. The Lacaze-Duthiers canyon : first steps toward the long-term study of ecosystem dynamics and functions. Our Common Future Under Climate Change, July 7-10, 2015, Paris, France.

Charles F., Nozais C., Pruski A., Lantoine F., Rzeznik-Orignac J. (2013). Trophic ecology of coastal soft bottoms: a dive into the stew of marine sediment. ASLO 2013 AQUATIC SCIENCES MEETING, February 17-22, 2013. New Orleans Louisiana, USA.

Rzeznik-Orignac J., Derelle E., Kalenitchenko D., Mariette J. (2012). Environmental genomic approach to assess richness of marine benthic micro-metazoans. Ecole Thématique Expert Génomique Environnementale (ETEGE). April 23-27,2012. Aussois. France.

French and foreign diplomas
- 2000-2004 Ph.D. Biological Oceanography, University of La Rochelle, France / University of Gdansk, Poland. Thesis title: Contribution of meiofauna to the transfer of metals through the foodwebs in the Bay of Marennes-Oléron and in the Bay of Gdansk. Supervisor: Professors P. Miramand and M. Wolowicz
- 1999 M.Sc. degree, Biological Oceanography, University of Bordeaux I, France.
- 1997 M.Sc. degree, Biological Oceanography, University of Gdansk, Poland.