Earthworms (Lumbricus terrestris) Affect Plant Seedling Recruitment and Microhabitat Heterogeneity

1. The effects of the anecic earthworm Lumbricus terrestris L. on plant seedling recruitment and spatial aggregation were investigated in a microcosm glasshouse experiment by varying plant seed size (small and large); functional groups (grasses, legumes, herbs); plant species diversity (1, 3, 6); an...

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Bibliographic Details
Published in:	Functional ecology 2006-04, Vol.20 (2), p.261-268
Main Authors:	Milcu, A., Schumacher, J., Scheu, S.
Format:	Article
Language:	eng
Subjects:	anecic earthworms Animal and plant ecology Animal, plant and microbial ecology Autoecology Biological and medical sciences Earthworms Functional groups Fundamental and applied biological sciences. Psychology General aspects Lumbricidae Lumbricus terrestris Microcosms Plant communities Plants regeneration niche secondary seed dispersal Seed size Seedlings Seeds Soil ecology Species
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Summary:	1. The effects of the anecic earthworm Lumbricus terrestris L. on plant seedling recruitment and spatial aggregation were investigated in a microcosm glasshouse experiment by varying plant seed size (small and large); functional groups (grasses, legumes, herbs); plant species diversity (1, 3, 6); and plant functional group diversity (1, 3). 2. Generally, earthworms buried seeds quickly irrespective of seed size and species. Secondary seed dispersal (phase II dispersal) by earthworms affected plant community composition depending mainly on seed size but less on plant functional group identity and diversity: small-seeded species were repressed whereas large-seeded were promoted. 3. Although, in general, recruitment of seedlings was less in the presence of L. terrestris, recruited seedlings benefited from establishing in the vicinity of earthworm burrows. The strong aggregation of plants in the vicinity of earthworm burrows resulted in plant communities with a more heterogeneous small-scale architecture. Earthworm burrows and middens acted as an important regeneration niche for emergent seedlings by reducing microsite and nutrient limitations. 4. In conclusion, seed dispersal, seed burial, seedling recruitment, and the spatial distribution of seedlings of plant species of different functional groups and with a wide range of seed size are strongly affected by L. terrestris, and this probably affects plant community composition.
ISSN:	0269-8463 1365-2435