Food- and density-dependent dispersal : Evidence from a soil collembolan
- Department of Biology
2. Experiments were designed for a release of collembolans in two types of soil in a physical arrangement of distinct patches represented by vials connected by tubings to cover a distance of 40 cm. Dispersal distances of individuals were determined, and theoretical and observed distributions compared.
3. Dispersal rates, estimated from transfer rate constants, ranged from 0 020 to 1 42 day-1, suggesting that an average 0. armatus moved less than 10 cm day -1. The probability to leave a patch varied between 0 10 and 0 50.
4. Dispersal was dependent on population density, soil type and length of fungal mycelium; it was almost twice as high at a high than at a low density (90 000 and 30000 individuals m-2) in a mor soil and four times as high in a sandy compared with a mor soil. Dispersal rate decreased as the mycelial length increased, especially in a sandy soil.
5. Collembolans in a feeding phase had a higher tendency to disperse than those that were moulting.
6. Enriching the soil patch at 40 cm distance from the release point with a favoured food item, the fungal species Mortierella isabellina, increased dispersal rate by more than four times in a mor soil, suggesting that fungal odour can attract collembolans from a large distance and enhance their rate of movement more than a three-fold increase of their population density does.
- ISSN: 0021-8790
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Previous research projects
- Effects of farming methods on organic carbon content of arable soils - Systematic Review (Mistra EviEM)
- Valuation of ecosystem services
- Functional Diversity of Carbon Cycling Microbes in Soil through Metagenomics
- Agriculture and global change, BECC
- Governance and economics of natural resources, BECC
- Conservation and animal movement, CAnMove
- Dispersal & speciation, CAnMove