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Thai) 1:
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The aim of this study was to disentangle the effect of seedingestion from the effect of earthworm casts as a germinationsubstrate. To do so, germination and seedling growth of four plantspecies were monitored in artificial casts made of soil coming from12 treatment combinations: 3 soil types(casts from 3 earthwormspecies + no-worm control casts) (see Clause et al., 2014). The effectof ingestion was tested through the comparison between seedsthat were ingested and excreted, and seeds that were not ingestedby earthworms. Thereby, we tested whether (i) cast substratumobtained from various earthworm species and soil types facilitatesseedling growth when seeds have not been ingested but does notalter germination rate, (ii) seedling growth is greater in castshaving higher nutrient contents, and (iii) seed ingestion byearthworms increases seed germination success
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