Team
Yannick Agnan
environmental biogeochemist

My research activities aim to study dynamics of contaminants, such as trace elements and pesticides, as well as organic matter at the interfaces of terrestrial compartments: atmosphere, pedosphere, hydrosphere, cryosphere, and biosphere. I am interested in contrasting environments, whether natural (temperate forests and polar ecosystems) or anthropogenic (agroecosystems and urban environments). For a better understanding of transfer processes, I use several geochemical tracers, such as stable isotopes and rare earth elements.
Experience
2019 – ... | Assistant professor
Earth and Life Institute, UCLouvain, Louvain-la-Neuve, Belgium

2018 – 2019 | Policy officer
Chambre d'Agriculture de l'Ariège, Pamiers, France

2016 – 2018 | Assistant professor
Métis, Sorbonne Université, Paris, France

2014 – 2016 | Postdoctoral researcher
Desert Research Institute, Reno, NV, USA

2014 | Policy officer
Institut écocitoyen pour la connaissance des pollutions, Fos-sur-Mer, France

2010 – 2013 | PhD student
EcoLab, Université de Toulouse, Toulouse, France

Qualification
2013 | PhD Environmental biogeochemistry
Bioaccumulation et bioindication par les lichens de la pollution atmosphérique actuelle et passée en métaux et en azote en France : sources, mécanismes et facteurs d'influence
EcoLab, University of Toulouse, Toulouse, France

2010 |
MSc Environmental geosciences
University of Toulouse, Toulouse, France

2007 |
BSc Biology and geology
University of Toulouse, Toulouse, France

Publications
(23) Jeannerod L., Carlier A., Schatz B., Daise C., Richel A., Agnan Y., Baude M., Jacquemart A.-L. (2022). Some bee-pollinated plants provide nutritionally incomplete pollen amino acid resources to their pollinators. PLOS ONE, XX: XX–XX. doi: XX

(22)
 Villani M., Mauclet E., Agnan Y., Druel A., Jasinski B., Taylor M., Schuur E.A.G., Opfergelt S. (2022). Mineral element recycling in topsoil following permafrost degradation and a vegetation shift in sub-Arctic tundra. Geoderma, 421: 115915. doi: 10.1016/j.geoderma.2022.115915

(21)
 Mauclet E., Agnan Y., Hirst C., Monhonval A., Pereira B., Vandeuren A., Villani M., Ledman J., Taylor M., Jasinski B.L., Schuur E.A.G., Opfergelt S. (2022). Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling. Biogeosciences, 19: 2333–2351. doi: 10.5194/bg-19-2333-2022

(20)
 Allain A., Alexis M.A., Bridoux M.C., Humbert G., Agnan Y., Rouelle M. (2022). Fingerprinting the elemental composition and chemodiversity of vegetation leachates: consequences for dissolved organic matter dynamics in Arctic environments. Biogeochemistry, XX: XX–XX. doi: 10.1007/s10533-022-00925-9

(19)
 Ayari J., Barbieri M., Agnan Y., Sellami A., Braham A., Dhaha F., Charef A. (2021). Trace element contamination in the mine-affected stream sediments of Oued Rarai in north-western Tunisia: a river basin scale assessment. Environmental Geochemistry and Health, 43: 4027–4042. doi: 10.1007/s10653-021-00887-1

(18) Howard D., Agnan Y., Helmig D., Yang Y., Obrist D. (2020). Environmental controls on ecosystem-scale cold-season methane and carbon dioxide fluxes in an Arctic tundra ecosystem. Biogeosciences, 17: 4025–4042. doi: 10.5194/bg-17-4025-2020

(17) Bouchard F., Agnan Y., Bröder L., Fouché J., Hirst C., Sjöberg Y., and the SPLASH team (2020). The SPLASH Action Group – Towards standardized sampling strategies in permafrost science. Advances in Polar Science, 31 (3): 153–155. doi: 10.13679/j.advps.2020.0009

(16) Jiskra M., Sonke J.E., Agnan Y., Helmig D., Obrist D. (2019). Insights from mercury stable isotopes on terrestrial – atmosphere exchange of Hg(0) in the Arctic tundra. Biogeosciences, 16: 4051–4064. doi: 10.5194/bg-16-4051-2019

(15) Khan T.R., Obrist D., Agnan Y., Selin N.E., Perlinger J.A. (2019). Atmosphere-terrestrial exchange of gaseous elemental mercury: parameterization improvement through direct comparison with measured ecosystem fluxes. Environmental Science: Processes & Impacts, 21: 1699–1712. doi: 10.1039/C9EM00341J

(14) Agnan Y., Courault R., Alexis M.A., Zanardo T., Cohen M., Sauvage M., Castrec-Rouelle M. (2019). Distribution of trace and major elements in subarctic ecosystem soils: sources and influence of vegetation. Science of the Total Environment, 682: 650–662. doi: 10.1016/j.scitotenv.2019.05.178

(13) Osterwalder S., Huang J.-H., Shetaya W. H., Agnan Y., Frossard A., Frey B., Alewell C., Kretzschmar R., Biester H., Obrist D. (2019). Mercury emission from industrially contaminated soils in relation to chemical, microbial, and meteorological factors. Environmental Pollution, 250: 944–952. doi: 10.1016/j.envpol.2019.03.093

(12) Agnan Y., Douglas T.A., Helmig D., Hueber J., Obrist D. (2018). Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace–gas exchanges. The Cryosphere, 12 (6): 1939–1956. doi: 10.5194/tc-12-1939-2018

(11) Dauphin C.-E., Dron J., Austruy A., Agnan Y., Granier V., Chamaret P. (2018). Participation de citoyens volontaires de la population locale dans les mesures de la qualité de l’air autour de la zone industrielle de Fos-sur-Mer. Pollution Atmosphérique, 236. doi: 10.4267/pollution-atmospherique.6502

(10) Obrist D., Agnan Y., Jiskra M., Olson C.L., Colegrove D.P., Hueber J., Moore C.W., Sonke J.E., Helmig D. (2017). Tundra uptake of atmospheric elemental mercury drives Arctic mercury pollution. Nature, 547: 201–204. doi: 10.1038/nature22997

(9) Agnan Y., Probst A., Séjalon-Delmas N. (2017). Evaluation of lichen species resistance to atmospheric metal pollution by coupling diversity and bioaccumulation approaches: a new bioindication scale for French forested areas. Ecological Indicators, 72: 99–110. doi: 10.1016/j.ecolind.2016.08.006

(8) Ayari J., Agnan Y., Charef A. (2016). Spatial assessment and source identification of trace metal pollution in stream sediments of Oued El Maadene basin, northern Tunisia. Environmental Monitoring and Assessment, 188 (7): 397. doi: 10.1007/s10661-016-5402-4

(7) Dron J., Austruy A., Agnan Y., Ratier A., Chamaret P. (2016). Utilisation de la biosurveillance lichénique sur la zone industrialo-portuaire de Fos-sur-Mer : retour sur trois ans de suivi à l'échelle d'un territoire intercommunal. Pollution Atmosphérique, 228. doi: 10.4267/pollution-atmospherique.5392

(6) Agnan Y., Le Dantec T., Moore C.W., Edwards G.C., Obrist D. (2016). New constraints on terrestrial surface-atmosphere fluxes of gaseous elemental mercury using a global database. Environmental Science & Technology, 50 (2): 507–524. doi: 10.1021/acs.est.5b04013

(5) Agnan Y., Séjalon-Delmas N., Claustres A., Probst A. (2015). Investigation of spatial and temporal metal atmospheric deposition in France through lichen and moss bioaccumulation over one century. Science of the Total Environment, 529: 285–296. doi: 10.1016/j.scitotenv.2015.05.083

(4) Gandois L., Agnan Y., Leblond S., Séjalon-Delmas N., Le Roux G., Probst A. (2014). Use of geochemical signatures, including rare earth elements, in mosses and lichens to assess spatial integration and the influence of forest environment. Atmospheric Environment, 95: 96–104. doi: 10.1016/j.atmosenv.2014.06.029

(3) Agnan Y., Séjalon-Delmas N., Probst A. (2014). Origin and distribution of rare earth elements in various lichen and moss species over the last century in France. Science of the Total Environment, 487: 1–12. doi: 10.1016/j.scitotenv.2014.03.132

(2) Agnan Y., Séjalon-Delmas N., Probst A. (2013). Comparing early twentieth century and present-day atmospheric pollution in S-W France: a story of lichens. Environmental Pollution, 172: 139–148. doi: 10.1016/j.envpol.2012.09.008

(1) Civeyrel L., Leclercq J., Demoly J.-P., Agnan Y., Quèbre N., Pélissier C., Otto T. (2011). Molecular systematics, character evolution, and pollen morphology of Cistus and Halimium (Cistaceae). Plant Systematics and Evolution, 295: 23–54. doi: 10.1007/s00606-011-0458-7
Conferences
(70) Vandevoorde N.*, Agnan Y., Barret P.V. (2022). Transition pathways for a pesticide use reduction in the Belgian Luxembourg. ELIday, Louvain-la-Neuve, 19 May 2022 [poster]

(69) Duquenne R.*, Herpoel M., Agnan Y. (2022). Manganese fluxes in European forest ecosystems: a lesson from the ICP Forests network. ELIday, Louvain-la-Neuve, 19 May 2022 [poster]

(68) Bemelmans N.*, Arbalestrie B., Agnan Y. (2022). Dynamics of trace elements in uncontaminated and contaminated soils: influence of glyphosate and AMPA. ELIday, Louvain-la-Neuve, 19 May 2022 [poster]

(67) Arbalestrie B.*, Falys J., Bemelmans N., Thami A., Agnan Y. (2022). Understanding trace element dynamics in the soil–plant continuum using rare earth elements. ELIday, Louvain-la-Neuve, 19 May 2022 [poster]

(66)
 Vandevoorde N.*, Agnan Y., Barret P.V. (2022). Trajectoires de transitions pour une réduction de l'utilisation des pesticides en Province de Luxembourg. GFP, Namur, 18–20 May 2022 [poster]

(65) Bemelmans N.*, Arbalestrie B., Agnan Y. (2022). Influence du glyphosate et de l’AMPA sur l’extractibilité des éléments traces dans les sols contaminés et non contaminés. GFP, Namur, 18–20 May 2022 [oral]

(64) Vandevoorde N.*, Agnan Y., Barret P.V. (2022). Agriculture de précision et agriculture durable : rêve ou réalité. Arlon Campus environnement, Arlon, 31 Mar.–1 Apr. 2022 [oral]

(63) Bemelmans N.*, Arbalestrie B., Agnan Y. (2022). Influence of glyphosate and AMPA on the extractability of trace elements from contaminated and uncontaminated soils. DYSS, Brussels, 31 Mar. 2022 [poster]

(62) Arbalestrie B.*, Falys J., Bemelmans N., Thami A., Agnan Y. (2022). Use of rare earth elements as tracers for soil–plant transfer of trace elements. DYSS, Brussels, 31 Mar. 2022 [poster]

(61)
 Villani M.*, Mauclet E., Agnan Y., Jasinski B., Taylor M., Schuur E.A.G. (2022). Does vegetation shift in Arctic tundra upon permafrost degradation influence mineral element recycling in the topsoil? EGU, online, 3–8 Apr. 2022 [pico]

(60) Mauclet E.*, Agnan Y., Hirst C., Monhonval A., Ledman J., Taylor M, Schuur E.A.G., Opfergelt S. (2021). Influence of permafrost degradation on foliar mineral element cycling upon changing subarctic tundra vegetation. International Geologica Belgica Meeting, Tervuren, 15–17 Sep. 2021 [oral]

(59) Villani M.*, Mauclet E., Agnan Y., Schuur E.A.G., Opfergelt S. (2021). Influence of permafrost degradation and shift in vegetation on litter and soil properties: case study in Central Alaska. International Geologica Belgica Meeting, Tervuren, 15–17 Sep. 2021 [oral]

(58)
Alexis M.A.*, Bouchard F., Agnan Y., Fouché J., Gandois L., Séjourné A., Shirokova L., Bröder L., Hirst C., Sjöberg Y., and SLPASH members (2021). The SPLASH action group – Towards standardized sampling strategies along the soil-to-hydrosystems continuum in permafrost landscapes. Eurosoil, online, 23–27 Aug. 2021 [oral]

(57) Allain A.*, Alexis M.A., Agnan Y., Parlanti E., Sourzac M., Anquetil C., Aubry E., Guittet A., Vaury V., Castrec-Rouelle M. (2021). Chemical characterization of water extractable organic matter from plants: A better understanding of soil dissolved organic matter sources in permafrost thawing regions. Eurosoil, online, 23–27 Aug. 2021 [oral]

(56) Allain A.*, Alexis M.A., Agnan Y., Humbert G., Parlanti E., Sourzac M., Guittet A., Anquetil C., Aubry E., Vaury V., Castrec-Rouelle M. (2021). Chemical characterization of water extractable organic matter from plants: A better understanding of soil dissolved organic matter sources and path in permafrost thawing regions. EGU, online, 19–30 Apr. 2021 [pico]

(55) Fouché J.*, Shakil S., Hirst C., Bröder L., Agnan Y., Sjöberg Y., Bouchard F. (2021). The SPLASH Action Group – Towards standardized sampling strategies along the soil-to-hydrosystems continuum in permafrost landscapes. EGU, online, 19–30 Apr. 2021 [pico]

(54) Mauclet E.*, Opfergelt S., Hirst C., Agnan Y., Monhonval A., Thomas M., Ledman J., Taylor M., Schuur E.A.G. (2020). Influence of thawing permafrost on soil-plant mineral element transfer: case study in Interior Alaska. AGU, online, 13–17 Dec. 2020 [oral]

(53) Jiskra M.*, Sonke J.E., Agnan Y., Helmig D., Obrist D. (2020). The role of permafrost soils in Arctic mercury cycling. Geochemistry of the Earth’s surface, Zürich, 16–21 Aug. 2020 [oral]

(52) Jiskra M.*, Sonke J.E., Lim A.G., Koiko S.L., Kosykh N., Pokrovsky O., Agnan Y., Helmig D., Obrist D. (2020). The role permafrost soils in Arctic mercury cycling: source tracing with mercury stable isotopes and revised pool estimate. EGU, Vienna, 3–8 May 2020 [oral]

(51) Bouchard F.*, Alexis M.A.*, Fouché J., Agnan Y., Gandois L., Séjourné A., Shirokova L. (2019). The interdisciplinary network on permafrost ecosystems: biogeochemical dynamics from soils to rivers in permafrost environments. Arctic Week, Paris, 9–13 Dec. 2019 [oral]

(50) Allain A.*, Alexis M.A., Agnan Y., Parlanti E., Sourzac M., Anquetil C., Aubry E., Guittet A., Alliot F., Castrec-Rouelle M. (2019). Chemical characterization of water extractable organic matter from plants: a better understanding of dissolved organic matter sources in permafrost thawing regions. Arctic Week, Paris, 9–13 Dec. 2019 [poster]

(49) Agnan Y.*, Courault R., Alexis M.A., Zanardo T., Cohen M., Sauvage M., Castrec-Rouelle M. (2019). Metal and organic matter dynamics in permafrost environments. Arctic Week, Paris, 9–13 Dec. 2019 [poster]

(48) Agnan Y.*, Alexis M.A., Kohli A., Parlanti E., Derenne S., Sourzac M., Anquetil D., Obrist D., Castrec-Rouelle M. (2019). Arctic soil organic matter under climate change: a key component for environmental processes. Arctic Week, Paris, 9–13 Dec. 2019 [oral]

(47) Agnan Y.*, Lorrillière R., Turcati L.* (2019). Premiers résultats Lichens GO! Rencontres Lichens GO!, Paris, 26 Nov. 2019 [oral]

(46) Khan T.R.*, Obrist D., Agnan Y., Selin N.E., Perlinger J.A. (2019). Use of ecosystem-level flux measurements to improve atmosphere-surface exchange parameterization of elemental mercury in chemical transport models. NADP, Boulder, 4–8 Nov. 2019 [poster]

(45) Agnan Y., Alexis M.A.*, Kohli A., Parlanti E., Derenne S., Sourzac M., Anquetil D., Obrist D., Castrec-Rouelle M. (2019). Characterization and evolution of soil organic matter in Arctic environments: from bulk to dissolved organic matter. SOM, Adelaide, 6–11 Oct. 2019 [oral]

(44) Fouché J.*, Agnan Y., Alexis M.A., Bouchard F., Gandois L., Séjourné A., Castrec-Rouelle M., Shirokova L. (2019). Biogeochemical dynamics from soils to rivers in permafrost environments. 4/1000 initiative new tangible global challenges for the soil, Poitiers, 17–20 Jun. 2019 [poster]

(43) Agnan Y.*, Alletto L., Boithias L., Budzinski H., Giuliano S., Deswarte C., Pelletier A. (2019). Suivis pluriannuels des transferts verticaux de pesticides dans des sols de vallée alluviale en monoculture de maïs irriguée. GFRP, Montpellier, 21–24 May 2019 [oral]

(42) Castrec-Rouelle M., Alexis M.A.*, Agnan Y., Gasparini J., Frantz A., Cabassa C., Cohen M., Courault R., Turcati L. (2018). Projet ITE : TRAC3S « Dégel des sols arctiques : contrôle de la dynamique des éléments traces par la matière organique dissoute ». Journées Climat et Impacts, Orsay, 29–30 Nov. 2018 [poster]

(41) Agnan Y.*, Courault R., Alexis M.A., Cohen M., Castrec-Rouelle M. (2018). Distribution spatiale des éléments traces dans les sols des écosystèmes subarctiques : quelle est l’influence de la végétation ? Journées Climat et Impacts, Orsay, 29–30 Nov. 2018 [oral]

(40) Agnan Y., Alexis M.A.*, Kohli A., Parlanti E., Derenne S., Anquetil C., Obrist D., Castrec-Rouelle M. (2018). Contrôle de la production de matière organique dissoute dans les sols de toundra arctique. Journée Scientifique Métis, Paris, 15 Nov. 2018 [poster]

(39) Obrist D.*, Howard D., Jiskra M., Khan T.R., Agnan Y., Perlinger J.A. (2018). Gaseous deposition of atmospheric elemental mercury in ecosystems – what we know and what is missing? NADP, Albany, 5–9 Nov. 2018 [invited]

(38) Agnan Y.*, Alexis M.A., Castrec-Rouelle M. (2018). Dynamics of trace elements in the Arctic: role of soil organic matter. EUCOP, Chamonix, 23 Jun.–1 Jul. 2018 [poster]

(37) Howard D.*, Agnan Y., Helmig D., Edward G.C., Richter L., Obrist D. (2018). Wintertime contributions to annual carbon exchange budgets in a high Arctic tundra ecosystem. AFM, Boise, 14–18 May 2018 [poster]

(36) Agnan Y.*, Alexis M.A., Kohli A., Pinta L., Anquetil C., Aubry E., Derenne S., Castrec-Rouelle M. (2018). Contrôle de la dynamique des éléments traces par la matière organique dissoute dans les sols arctiques en dégel. ResMO, Trégastel, 4–7 Feb. 2018 [oral]

(35) Gandois L.*, Agnan Y., Probst A. (2017). Quel impact et quel devenir des pollutions métalliques en forêt ? Colloque Renecofor, Beaune, 11–13 Oct. 2017 [oral]

(34) Alexis M.A., Agnan Y.*, Castrec-Rouelle M., Courault R., Anquetil C., Derenne S. (2017). Characterization of the dissolved organic matter from arctic soils under climate change. Goldschmidt, Paris, 13–18 Aug. 2017 [poster]

(33) Agnan Y.*, Alexis M.A., Castrec-Rouelle M., Anquetil C., Obrist D., Derenne S. (2017). Thawing of Arctic soils: control of trace element dynamics by organic matter. Goldschmidt, Paris, 13–18 Aug. 2017 [oral]

(32) Jiskra M.*, Sonke J., Obrist D., Agnan Y., Hedge C., Moore C.W., Paxton D., Hueber J., Helmig D. (2017). A mercury isotope study on terrestrial–atmosphere mercury exchange in the Arctic tundra. ICMGP, Providence, 16–21 Jul. 2017 [oral]

(31) Hedge C.*, Agnan Y., Jiskra M., Moore C.W., Biester H., Obrist D. (2017). Hg storage and mobility in Arctic tundra ecosystems of northern Alaska. ICMGP, Providence, 16–21 Jul. 2017 [oral]

(30) Obrist D.*, Agnan Y., Jiskra M., Paxton D., Hedge C., Hueber J., Moore C.W., Sonke J., Helmig D. (2017). A mass balance of atmospheric mercury deposition in the Arctic tundra: gaseous elemental mercury uptake drives a globally-important mercury sink. ICMGP, Providence, 16–21 Jul. 2017 [oral]

(29)
Howard D.*, Agnan Y., Harvey A., Yang Y., Obrist D. (2017). Investigating greenhouse gas fluxes from tundra soils during freeze and thaw cycles using GC-MS flux chambers. Toolik Field Station Science meeting, Portland, 27–28 Jan. 2017 [poster]

(28) Agnan Y.*, Rouelle M., Alexis M.A. (2017). Dégel des sols arctiques : contrôle de la dynamique des éléments traces par la matière organique dissoute. Journée Scientifique METIS, Paris, 13 Jan. 2017 [oral]

(27) Obrist D.*, Agnan Y., Hedge C., Moore C.W., Helmig D., Hueber J., Paxton D. (2016). Two-year record of trace gas (CO2, CH4, O2, and Hg0) concentrations and dynamics in arctic tundra soils of northern Alaska: non-linear temperature controls and impacts of diffusivity. AGU, San Francisco, 12–16 Dec. 2016 [oral]

(26) Khan T.R.*, Agnan Y., Obrist D., Perlinger J.A. (2016). Improvements in mercury atmosphere–surface exchange parameterizations for incorporation into chemical transport models. AGU, San Francisco, 12–16 Dec. 2016 [poster]

(25) Hedge C.*, Obrist D., Agnan Y., Moore C.W., Biester H., Jiskra M., Helmig D. (2016). Soil and plant mercury dynamics in the arctic tundra. ICHMET, Ghent, 12–15 Sep. 2016 [oral]

(24) Agnan Y., Crews J., Hedge C.*, Pearson C., Hoberg J., Obrist D. (2016). Canopy influence on trace metal dynamics of snowfall, snowpack, and snowmelt. ICHMET, Ghent, 12–15 Sep. 2016 [poster]

(23) Agnan Y., Edwards G., Obrist D.* (2016). Methane emissions throughout the year in arctic tundra, northern Alaska. Goldschmidt, Yokohama, 26 Jun.–1 Jul. 2016 [poster]

(22) Obrist D.*, Agnan Y., Zheng W., Bergquist B., Helmig D. (2016). Terrestrial mercury biogeochemistry: a need to constrain the role of dry deposition of elemental mercury. Goldschmidt, Yokohama,  26 Jun.–1 Jul. 2016 [oral]

(21) Dauphin C.-E.*, Dron J., Austruy A., Agnan Y., Granier V., Chamaret P. (2016). Implication de citoyens volontaires de la population locale dans les mesures de la qualité de l’air autour de la zone industrielle de Fos-sur-Mer / Étang de Berre. Interdisciplinary workshop on air quality, Lille, 2–3 Feb. 2016 [oral]

(20) Agnan Y.*, Obrist D., Edwards G., Moore C.W., Hedge C., Helmig D., Paxton D., Hueber J. (2015). Spatial and temporal variability of methane mole fractions and exchanges in and between soil, snow, and the atmosphere in a tundra system in northern Alaska. AGU, San Francisco, 14–18 Dec. 2015 [poster]

(19) Obrist D., Helmig D., Agnan Y.*, Hedge C., Moore C.W., Paxton D., Hueber J. (2015). Mercury dynamics of a tundra ecosystem in northern Alaska and feedback controls on atmospheric concentrations. AGU, San Francisco, 14–18 Dec. 2015 [oral]

(18) Moore C.W.*, Steffen A., Dastoor A., Nghiem S. V., Agnan Y., Obrist D. (2015). Using existing arctic atmospheric mercury measurements to refine global and regional scale atmospheric transport models. AGU, San Francisco, 14–18 Dec. 2015 [oral]

(17) Hedge C.*, Obrist D., Agnan Y., Moore C.W., Biester H., Helmig D. (2015). Soil and plant mercury concentrations and pools in the Arctic tundra of northern Alaska. AGU, San Francisco, 14–18 Dec. 2015 [oral]

(16) Khan T.R.*, Agnan Y., Obrist D., Selin N., Urban N., Wu S., Perlinger J.A. (2015). Preliminary assessment of mercury atmosphere-surface exchange parameterizations for incorporation into chemical transport models. AGU, San Francisco, 14–18 Dec. 2015 [poster]

(15) Agnan Y.*, Moore C.W., Edwards G., Le Dantec T., Obrist D. (2015). A global analysis of surface-atmosphere exchange of gaseous elemental mercury (Hg0). ICMGP, Jeju, 14–19 Jun. 2015 [oral]

(14) Obrist D., Helmig D., Agnan Y.*, Hueber J., Hedge C., Moore C.W., Kretzschmar R., Wiederhold I., Biester H., Chow J., Steffen A., Brooks S. (2015). Mercury dynamics of an inland tundra ecosystem in northern Alaska: an attempt for a first mass balance. ICMGP, Jeju, 14–19 Jun., 2015 [oral]

(13) Hedge C.*, Obrist D., Kretzschmar R., Wiederhold I., Biester H., Chow J., Moore C.W., Agnan Y., Helmig D. (2015). Soil and plant mercury concentrations and pools in the Arctic tundra of northern Alaska. ICMGP, Jeju, 14–19 Jun. 2015 [oral]

(12) Obrist D.*, Hedge C., Agnan Y., Moore C.W., Helmig D., Hueber J. (2015). Comparisons of terrestrial mercury (Hg) accumulation and dynamics across temperate forests and an Arctic tundra site. AGU-GAC-MAC-CGU Joint Assembly, Montréal, 1 May 2015 [invited]

(11) Agnan Y.*, Moore C.W., Le Dantec T., Obrist D. (2014). A global analysis of surface-atmosphere exchange of gaseous elemental mercury (Hg0). AGU, San Francisco, 15–19 Dec. 2014 [oral]

(10) Obrist D.*, Moore C.W., Le Dantec T., Agnan Y., Pearson C. (2014). Soil mercury sequestration and re-mobilization: importance for the global cycling of mercury. SSSA, Long Beach, 2–5 Nov. 2014 [oral]

(9) Le Dantec T., Agnan Y.*, Obrist D., Moore C.W. (2014). A comprehensive database of global soil-atmosphere flux studies of mercury. SSSA, Long Beach, 2–5 Nov. 2014 [oral]

(8) Dron J.*, Austruy A., Agnan Y., Giraudeau P., Chamaret P. (2014). Utilisation de la biosurveillance lichénique sur la zone industrialo-portuaire de Fos-sur-Mer : retour sur trois ans de suivi à l'échelle d'un territoire intercommunal. Workshop APPA, Lille, 13–14 Oct. 2014 [oral]

(7) Agnan Y.* (2014). Les lichens : témoins de la pollution atmosphérique actuelle et passée. Colloque Cataenat, Quillan, 9–10 Apr. 2014 [oral]

(6) Agnan Y.*, Séjalon-Delmas N., Probst A. (2013). An historical investigation of atmospheric pollution in France using lichens herbaria. SEGH, Toulouse, 8–12 Jul. 2013 [oral]

(5) Gandois L.*, Agnan Y., Leblond S., Le Roux G., Séjalon-Delmas N., Probst A. (2013). Biomonitoring of trace metal atmospheric deposition in forest ecosystems by mosses and lichens: relative influence of local environment. SEGH, Toulouse, 8–12 Jul. 2013 [oral]

(4) Claustres A.*, Agnan Y., Séjalon-Delmas N., Le Roux G., Probst A. (2013). Origin of atmospheric trace elements using rare earth elements and lead isotopes: lichens monitoring in a mountain volcanic area (the Puy-de-Dôme, France). SEGH, Toulouse, 8–12 Jul. 2013 [poster]

(3) Agnan Y.*, Séjalon-Delmas N., Claustres A., Probst A. (2012). Large-scale atmospheric contribution of trace elements registered in foliose lichens in remote French areas. ICHMET, Rome, 23–27 Sep. 2012 [oral]

(2) Agnan Y.*, Séjalon-Delmas N., Probst A. (2011). Are lichens good indicators of present-day and past atmospheric pollution of metals? Journée Écologie Toulouse, Toulouse, 11 Nov. 2011 [oral]

(1) Agnan Y.*, Séjalon-Delmas N., Probst A. (2011). Comparing early twentieth century and present-day atmospheric pollution in S-W France: a lichen story. Acid Rain, Pékin, 15–18 Jun. 2011 [oral]

* speaker
Projects
2022 – 2027 | NUTRIBEE – Pollen nutritional quality as a critical link between landscape, biodiversity, and bee health
Jacquemart A.-L. (PI), Agnan Y., Defourny P., Radoux J. (co-PI) / ARC UCLouvain / €915,000

2021 – 2023 | INCEPTION – Interactions between nitrogen and carbon cycles in ecosystems across permafrost in transition
Alexis M. (PI) / CNRS EC2CO / €41,000

2019 – 2020 | ROASTY – Release of organic matter from abrupt and slow thermokarst sources in central Yakutia, eastern Siberia
Séjourné A. (PI) / IPSL / €6,000

2019 – 2021 | DYNAMOET-TK – Contrôle de la dynamique des éléments traces par la matière organique dissoute dans des lacs thermokarstiques de Sibérie occidentale
Castrec-Rouelle M. (PI) / CNRS EC2CO / €35,000


2018 – 2022 | TRAC3S – Éléments traces en Arctique, conséquences du changement climatique
Alexis M., Castrec-Rouelle M. (PI) / Sorbonne Université ITE / €20,000


2015 – 2017 | GEOTRACES Arctic Section: Determination of atmospheric wet and dry deposition and air-sea exchange of mercury species from coastal and offshore waters
Mason R. (PI), Moore C.W., Brooks S., Agnan Y. (Co-PI) / NSF Division of Ocean Sciences / $266,000


2014 – 2016 | Systematic investigation of the biogeochemical stability of iron oxide-bound organic carbon: linking redox cycles and carbon persistence
Yang Y. (PI), Roden E.E., Obrist D., Kersting A.B., Gu B. (Co-PI) / DOE Office of Science Program Office / $1,500,000

2014 – 2017 | Building capacity in interdisciplinary snow sciences for a changing world
Obrist D. (PI), Tyler S., Hausrath L., Ferrell G. (Co-PI) / NASA EPSCoR / $1,125,000


2013 – 2017 | Managing impacts of global transport of atmosphere-surface exchangeable pollutants in the context of global change
Perlinger J. (PI), Norman E., Obrist D., Selin N., Wu S. (Co-PI) / NSF Dynamics of Coupled Natural-Human Systems / $1,500,000

2013 – 2017 | Soil-snow-atmosphere exchange of mercury in the interior Arctic tundra
Obrist D. (PI), Helmig D. (Co-PI) / NSF Division of Polar Programs / $833,000

2010 – 2013 | BIOMALIN – Bioaccumulation des métaux et de l’azote par les lichens : évolution historique et comparaison avec les mousses et les écorces
Probst A. (PI) / Ademe Département Surveillance de la Qualité de l’Air / €180,000
Collaborations
Supervision
PhD STUDENTS

Noé Vandevoorde (2021–2025)
State of the art and trajectories for a reduction in the use of pesticides in the Belgian Province of Luxembourg [co-sup. P. Baret]
Funding: Province de Luxembourg

Romain Duquenne (2020–2027)
Influence of manganese recycling on soil organic matter fate in forested ecosystems [co-sup. P. Delmelle]
Funding: UCLouvain teaching assistant

Nathan Bemelmans (2020–2024)
Control of trace element mobility by pesticides in the soil–plant system
Funding: FNRS–FRIA

Bryan Arbalestrie (2020–2024)
Influence of organic matter on trace element dynamics in agroecosystems: stable isotopes and rare earth elements as tracing approach
Funding: FNRS–FRIA

MSc STUDENTS

Alyssa Croquet (2023)
Geochemistry of major and trace elements in Arctic vegetation [co-sup. S. Opfergelt]

Apolline Delvaux (2023)
Impact of microorganism inoculation on soil quality and physicochemical properties [co-sup. M. Javaux]

Inès Braquenier (2023)
Influence of eutrophication on floral resources in agricultural soils [co-sup. A.-L. Jacquemart]

Sami Royer (2023)
Comparison of carbon cycle in innovative cultural systems [co-sup. B. Hardy]

Nicolas Lamine (2023)
Soil and plant nutrient status in contrasted agricultural systems in terms of fertility [co-sup. B. Hardy]

Louis André (2023)

Chemistry of atmospheric deposition in European forest ecosystems: variables influencing manganese fluxes [co-sup. R. Duquenne]

Rosalie Dejardin (2023)
Influence of pesticide application on trace element transfer in agroecosystems [co-sup. N. Bemelmans]

Marie Dedoyard (2023)
Influence of organic matter input on rare earth element transfer in agroecosystems [co-sup. B. Arbalestrie]

Olivier Steisel (2022)
Chemical composition of tree growth rings to detect root asphyxiation issues, and analyze their impact on the vitality of beech trees in Wallonia [co-sup. Q. Ponette, H. Titeux]

Lorane Jans (2022)
Benefits and risks related to the application of biochar in agricultural soils in Wallonia: results of on-farm surveys concerning the effects of pre-industrial charcoal kiln sites on soils and cultivated plants [co-sup. B. Hardy]

Matthieu Herpoel (2022)
Manganese recycling in European forest ecosystems: influence of tree species on throughfall and litterfall manganese fluxes [co-sup. R. Duquenne]

Adil Thami (2022)
Transfer of trace elements in the soil-plant system: influence of organic matter input in uncontaminated and contaminated agricultural soils [co-sup. B. Arbalestrie]


Hugo Counoy (2022)
Establishment of air quality monitoring using lichens in Louvain-la-Neuve, Belgium: a citizen science approach

Benjamin Canut (2021)

First data investigation from Lichens GO! citizen science network [co-sup. L. Turcati, R. Lorrillière, S. Turpin, S. Benateau]

Maëlle Villani (2021)
Influence of permafrost degradation and vegetation change on litter and soil properties [co-sup. S. Opfergelt]

Julie Falys (2021)
Transfer of rare earth elements in the soil–plant system of a winter cover crop

Linda Seggi (2018)

Factors influencing the lichen distribution in urban environment [co-sup. L. Turcati]

Tony Zanardo (2018)
Spatial distribution of trace elements in arctic ecosystems

Lancelot Pinta (2017)

Distribution and dynamics of trace elements in high latitude environments

Tariq Demmou (2012)

Establishment of experimental protocol to evaluate the lichen biosorption mechanisms

Adrien Claustres (2012)
Lichen monitoring of present-day and past trace metals atmospheric deposition in Auvergne, France: origin of elements and influence of environmental factors
Teaching
Pedology
Soil sciences (LBIR1336)
Applied pedology (LBIRE2104)
Plant production (LBIRA2108)

Environment
Environmental pollution (LENVI2012)
Climate change: impacts and solutions (LENVI2005)
Human and environmental toxicology (LBRTE2201)
Introduction to the challenges of sustainable development (MOOC)

Projects
Integrated project in environmental assessment (LBIR1270)
Evaluation of environmental impact: project and introduction to database management (LBIRE2130)
Integrated project in pollution management (LBIRE2231)
Citizen science
2018 – ... | Lichens GO! network
Sorbonne Université, Paris, France
2014 | VOCE network
Institut Écocitoyen, Fos-sur-Mer, France
Outreach
2022 – ... | Printemps des sciences
2021 | Webinare Téla Conférences
Lichens as indicators of air quality
2014 | Futura-Science
Lichens: witnesses of atmospheric pollution
2012 – 2014 | Les étoiles brillent pour tous
Media
8 Mar. 2018 | La Libre Belgique [journal]
Le sous-sol de l’Arctique gavé de mercure
18 Dec. 2017 | Scientific American [online]
Mercury from industrialized nations is polluting the Arctic
16 Aug. 2017 | Le Figaro [journal]
La toundra, passeur de mercure pour l'océan Arctique
30 Jul. 2017 | La Croix [online]
La toundra stocke le mercure atmosphérique avant de le relâcher dans les fleuves et mers arctiques
13 Jul. 2017 | RTS La 1ère | CQFD [radio]
Quand la toundra sert de passeur
12 Jun. 2017 | The Washington Post [online]
The Arctic is full of mercury, and scientists think they know how it’s getting there
Evaluation
PhD jury
François Gaspard (UCLouvain, 9 Nov. 2020)
Élisabeth Mauclet (UCLouvain, 17 May 2022)
Richard Osei (UCLouvain, 8 Jun. 2022)

PhD committee
Kamarou-Dine Seydou (UCLouvain, 2022–2026)
Joachim Lopez (UCLouvain–KU Leuven, 2022–2026)
Maëlle Villani (UCLouvain, 2021–2025)
Arnaud Denis (UCLouvain, 2020–2024)
Manon Ferdinand (UCLouvain, 2019–2023)
Maxime Thomas (UCLouvain, 2019–2025)

Laboratory
ECODIV (Rouen, France, 2021)

Journals
Environmental Science & Technology / Science of the Total Environment / Environmental Pollution / Chemosphere / Biogeosciences / Environmental Science and Pollution Research / Communications Earth & Environment / Scientific Report / Critical Reviews in Environmental Science and Technology / Chemical Geology / Ecological Indicators / Journal of Ecology / Environmental Research / Ecological Engineering / Ecotoxicology and Environmental Safety / Agricultural and Forest Meteorology / Arctic Science / Atmospheric Pollution Research
[~8 articles per year]
Awards
2020 | Prix Graines d’innovation
Lichen biomonitoring protocol (ONF, Paris)


2014 | Prix Léopold Escande
Doctoral dissertation (INPT, Toulouse)