Omnivores add "connectedness" to the food web by feeding on more than one food source (Coleman et al., 1983). Omnivorous nematodes, such as some Doryla-midae, make up only a small portion of the total nematodes in agricultural ecosystems (Wasilewska, 1979; Neher and Campbell, 1996). They may feed on algae, bacteria, fungi, and other nematodes. Collembolans are often microbial feeders, but may also be facultative predators of nematodes (Snider et al., 1990). Mites that feed on both microbes and decaying plant material can be found in the oribatid mite families Nothridae, Camisiidae, Liacaridae, Oribatulidae, and Galumnidae. Coprophages, which ingest dung and carrion, including dead insects, are found among the oribatid families Euphthiracaridae, Phthiracaridae, Galumnidae, and Oppiidae.
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