期刊
ECOLOGY LETTERS
卷 21, 期 6, 页码 896-904出版社
WILEY
DOI: 10.1111/ele.12957
关键词
Community assembly; ecosystem development; mutualist network; mycorrhizal symbiosis; preferential attachment; retrogression; succession
类别
资金
- NZ's Biological Heritage National Science Challenge funding
- New Zealand Ministry of Business, Innovation and Employment's Science and Innovation Group
- Bio-protection Research Centre
- Rutherford Discovery Fellowship
The processes whereby ecological networks emerge, persist and decay throughout ecosystem development are largely unknown. Here we study networks of plant and arbuscular mycorrhizal fungal (AMF) communities along a 120000year soil chronosequence, as they undergo assembly (progression) and then disassembly (retrogression). We found that network assembly and disassembly were symmetrical, self-reinforcing processes that together were capable of generating key attributes of network architecture. Plant and AMF species that had short indirect paths to others in the community (i.e. high centrality), rather than many direct interaction partners (i.e. high degree), were best able to attract new interaction partners and, in the case of AMF species, also to retain existing interactions with plants during retrogression. We then show using simulations that these non-random patterns of attachment and detachment promote nestedness of the network. These results have implications for predicting extinction sequences, identifying focal points for invasions and suggesting trajectories for restoration.
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