EDISP

Edisp was a project funded by the French Agency for Research (ANR 2008-2012) aiming at determining the patterns and drivers of Earthworm dispersal.

Dispersal is a central process that has overwhelmingly important implications in species ecology and evolution. Surprisingly, despite earthworms’ dominant action on ecosystem functioning and their tendency to be invasive, their dispersal capacities have been poorly documented.

In the project Edisp we used a combination of direct and indirect observation techniques of earthworms to evaluate their capacities of movements.We performed direct measurement of earthworms’ dispersal capacities by quantifying the distance they can travel away from releasing points in the field, during various length of time. In this approach we used a recent technique based on fluorescent tags to retrieve the individuals that were inoculated in the releasing points. We also performed lab experiments to identify the key factors that trigger earthworms’ active dispersal, such as habitat quality or density of conspecifics.

The indirect approach entailed using the genetic structure of populations to infer the patterns of earthworms’ dispersal in the landscape. This approach required the development of new molecular tools to depict individuals’ genotypes, which lead us to reconsider and update the systematic of the species on which we worked, Allolobophora chlorotica. We sampled individuals following a multiscale sampling design, using highly accurate global position system (differential GPS). This allowed us to link the genotype of the individuals to their position in the landscape and to landscape features.

Major Results
Earthworms display some unusual characteristics regarding their dispersal behavior. While the dispersal capacity of the great majority of animals decreases with distance – the further, the harder to reach – earthworms are capable of colonizing remote areas due to their capacity to be transported by external agents, cattle and tractors especially. As a result, their distribution appears closely bond to human activities. Besides, the modifications they bring to their environment - the soil – loop backs with their own dispersal behavior. This feedback suggests that earthworm behavior evolves partly in response to selection pressure modified by the activity of earthworms themselves

Summary of the project (mostly in french).


Publications and communications (see section Publications on the left for the pdfs of the papers)

Articles
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Fine-scale spatial genetic structure and dispersal constraints in two earthworm species. Dupont L., Grésille Y., Richard B., Decaëns T. and Mathieu J.  Biological Journal of the Linnean Society, in press 

Impact of soil engineering by two contrasting species of earthworms on their dispersal rates. Caro G., Hartmann C., Decaëns T., Barot S., Mora P., Mathieu J. , Applied Soil Ecology, 2014, 84:223-230.

Genetic Structure of Earthworm Populations at a Regional Scale: Inferences from Mitochondrial and Microsatellite Molecular Markers in Aporrectodea icterica (Savigny 1826). M. Torres-Leguizamon, J. Mathieu, T.Decaens, and L. Dupont, . PlosOne, 2014, e101597

Glaciation as an historical filter of below-ground biodiversity. Mathieu J., Davies J.T,Journal of Biogeography, 2014, 41:1204-1214

The dispersal of the earthworm Aporrectodea giardi responds faster to habitat quality than to cumulative use of habitat in experimental conditions Caro G., Decaens T., Mathieu J., Applied Soil Ecology

Are dispersal behaviours of earthworms related to their functional group? Caro G., Decaens
T., Lecarpenter C., Mathieu J., Soil Biology and Biochemistry,2012 58: 181-187

Spatial organization of earthworm assemblages in pastures of northwestern France, Richard B.Legras, M. Margerie P., Mathieu J., Barot S., Caro G., Desjardins T., Dubs F., Dupont L., Decaëns T., European Journal of Soil Biology, 2012 53: 62-69

Is earthworms' dispersal facilitated by the ecosystem engineering activities of conspecifics? Caro G., Abourachid A., Decaëns T., Buono L., Mathieu J., Biology and Fertility of Soils, 2012 48: 961-965

New molecular tools for population genetics of earthworms:Isolation of polymorphic microsatellite markers in Aporrectodea icterica (Savigny 1826) Torres-Leguizamon M., Mathieu J., Livet A., Decaëns T., Dupont L. Soil Biology & Biochemistry 2012  51: 16-19

New insight into the genetic structure of the Allolobophora chlorotica aggregate in Europe using microsatellite and mitochondrial data. Dupont L., Lazrek F., Porco D., King R.A., Rougerie R., Symondson W.O.C., Livet A., Richard B., Decaëns T., Butt K.R., Mathieu J.. Pedobiologia 2011 54: 217-224

- Habitat quality, conspecific density, and habitat pre-use affect the dispersal behaviour of two earthworm species, Aporrectodea icterica and Dendrobaena veneta, in a mesocosm experiment. Mathieu J., Barot S., Blouin M, Caro G., Decaëns T.,Dubs F., Dupont L., Jouquet P., Nai P., Soil Biology and Biochemistry, 2010. 42: 203-209

- Perspectives on the application of molecular genetics to earthworm ecology, Dupont L., Pedobiologia, 2009. 52(3): 191-205


Communications
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Edisp : résultats d'un projet ANR sur la dispersion et le maintien de la biodiversité des vers de terre en agroécosystèmes, J. Mathieu, S. Barot, M. Blouin, G. Caro, T. Decaens, L. Dubois, F. Dubs, L. Dupont, A. Husté, N. Loeuille, B. Richard, M. Torres, IALE 2014, Dijon

Lessons learned frome a four years project on earthworm dispersal, Mathieu J., Barot S., Caro G., Decaens T., Dubs F., Dupont L., Husté A., Richard B., Torres M. GSBI (Global Soil Biodiversity Initiative), 2014, Dijon

Dispersal of ecosystem engineers: do general rules hold true? Insights from earthworms, Mathieu J., Organisms on the move, Lund, Sweden, 2013

Evidences of conspecific facilitation of earthworms’ dispersal ecology, Caro, G., Abourachid, A.,Rouland-Lefbvre C., Decaëns T., Mathieu J.,7th Ecology & Behaviour Meeting, Rennes, France, May 2011

Some basic aspects of conditional dependent dispersal of earthworms, Organisms on the move: On the ecology and evolution of dispersal, Mathieu J., 4th meeting of the International Dispersal workgroup, Ghent, September 2009

Projet Edisp : combiner génétique des populations, écologie et modélisation pour inférer les modalités de dispersion des vers de terre, Mathieu J., Dupont D., Decaëns T., Barot S., Blouin S., Dubs F., Loeuille N., Margerie P., XXXème Colloque Petit Pois Déridé, Rennes, August 2008



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Jérôme Mathieu,
Mar 13, 2016, 8:12 AM
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Jérôme Mathieu,
Mar 13, 2016, 8:12 AM
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Jérôme Mathieu,
Mar 13, 2016, 8:13 AM
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Jérôme Mathieu,
Mar 13, 2016, 8:13 AM
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Jérôme Mathieu,
Mar 13, 2016, 8:32 AM
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Jérôme Mathieu,
Mar 13, 2016, 8:28 AM
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GSBI.pdf
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Jérôme Mathieu,
Mar 13, 2016, 8:15 AM
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