Complex taxonomy and global phylogeography of the well-known tropical earthworm Pontoscolex corethrurus

Taheri S., James S., Roy Virginie, Decaëns Thibaud, Williams B.W., Anderson F., Rougerie Rodolphe, Chang C.H., Brown George G., Cunha L., Stanton D.W.G., da Silva E., Chen J.H., Lemmon A.R., Bartz Marie L.C., Baretta D., Barois Isabelle, Lapied E., Coulis Mathieu, Dupont Lise. 2018. Complex taxonomy and global phylogeography of the well-known tropical earthworm Pontoscolex corethrurus. In : Challenges in tropical ecology and conservation - global perspectives. Forget Pierre-Michel (ed.), Reeb Catherine (ed.), Migliore Jérémy (ed.), Kuhlmann Heïke (ed.). Frankfurt am Main : gtö, Résumé, 149-150. ISBN 978-3-00-059300-0 European conference of tropical ecology. Annual meeting of the society for tropical ecology (GTÖ), Paris, France, 26 Mars 2018/29 Mars 2018.

Résumé : Few earthworm species are peregrine and among them, Pontoscolex corethrurus is the most well-known. Probably native from the Guyana shield, this earthworm is nowadays distributed worldwide, in the tropical and sub-tropical zones. It is found in a wide range of habitats, from apparently pristine to any kind of human-disturbed environments. P. corethrurus presents several characteristics of a successful invader: r-strategy, parthenogenesis reproduction and ecological and reproductive plasticity. Although its ecological interactions with the environment were well documented, the taxonomic status of this earthworm was unclear. We investigated the phylogenetic relationships within the genus Pontoscolex at a global scale (25 countries), focusing on morphologically indistinguishable lineages using the mitochondrial COI and 16S markers, the nuclear ITS 2 and 28S markers and a large-scale multilocus sequence data matrix obtained using the Anchored Hybrid Enrichment (AHE) phylogenomic method. Four cryptic species were discovered within the P. corethrurus species complex and one of them, P. corethrurus L1 was particularly widespread. Although sympatry between L1, L3 and L4 was observed, no case of hybridization was detected between L1 and the two other cryptic species, confirming the status of species of P. corethrurus L1. A population genetics study of this species using COI sequences and AFLP data revealed a low mitochondrial genetic diversity and a high proportion of clones in some populations, in accordance with the principal mode of reproduction of the species (i.e., parthenogenesis). However, variable levels of genetic diversity among populations and results of gametic disequilibrium analysis suggesting recombination in several populations, confirmed a mixed-mating strategy (sexual reproduction and parthenogenesis).

Auteurs et affiliations

• Taheri S., Université Paris-Est Créteil Val-de-Marne (FRA)
• James S., University of Iowa (USA)
• Roy Virginie, Université Paris-Est Créteil Val-de-Marne (FRA)
• Decaëns Thibaud
• Williams B.W., Illinois State University (USA)
• Anderson F., Illinois State University (USA)
• Rougerie Rodolphe, MNHN (FRA)
• Chang C.H., Université John Hopkins (USA)
• Brown George G., EMBRAPA (BRA)
• Cunha L., EMBRAPA (BRA)
• Stanton D.W.G., University of Wales College of Cardiff (GBR)
• da Silva E., EMBRAPA (BRA)
• Chen J.H., National Taiwan University (TWN)
• Lemmon A.R., University of Florida (USA)
• Bartz Marie L.C., Universidade Positivo (BRA)
• Baretta D., UDESC (BRA)
• Barois Isabelle, INECOL (MEX)
• Lapied E., Norwegian University of Life Sciences (NOR)
• Coulis Mathieu, CIRAD-PERSYST-UPR GECO (MTQ) ORCID: 0000-0001-5895-8519
• Dupont Lise, Université Paris-Est Créteil Val-de-Marne (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/595054/)

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