期刊
JOURNAL OF ANIMAL ECOLOGY
卷 87, 期 3, 页码 790-800出版社
WILEY
DOI: 10.1111/1365-2656.12782
关键词
community structure; degree; likelihood; motifs; species role; stochastic blockmodel
资金
- NSF GRFP
- U.S. Department of Education [P200A150101]
- NSF [DEB-1148867, DEB-0553768]
- National Center for Ecological Analysis and Synthesis
- Division Of Environmental Biology
- Direct For Biological Sciences [1148867] Funding Source: National Science Foundation
1. Parasites are ubiquitous and have been shown to influence macroscopic measures of ecological network structure, such as connectance and robustness, as well as local structure, such as subgraph frequencies. Nevertheless, they are often under-represented in ecological studies due to their small size and often complex life cycles. 2. We consider whether or not parasites play structurally unique roles in ecological networks; that is, can we distinguish parasites from other species using network structure alone? 3. We partition the species in a community statistically using the group model, and we test whether or not parasites tend to cluster in their own groups, using a measure of imbalance. 4. We find that parasites form highly imbalanced groups, and that concomitant predation, in which a predator consumes a prey and its parasites, but not the number of interactions, improves the group model's ability to distinguish parasites from non-parasites. 5. This work demonstrates that parasites and non-parasites interact in networks in statistically distinct ways, and that these differences are partly, but not entirely, due to the existence of concomitant predation.
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