Inter- and intra-specific interactions of Lumbricus rubellus (Hoffmeister, 1843) and Octolasion lacteum (Örley, 1881) (Lumbricidae) and the implication for C cycling

► Influence of earthworms on soil carbon cycling is species-dependent. ► Epigeic earthworms stimulate soil respiration more than endogeic earthworms. ► Intraspecific competition is more intense than interspecific competition. ► Earthworm effects on litter consumption are non-additive (synergistic).