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INSECTS IN THE DETRITUS FOOD WEB

Return to Entomology schedule

Read: T&J Chap. 4 pp 92-93

REFERENCES:

Anderson, J. 6 Oct. 1983. Life in the soil is a ferment of little rotters. New Scientist 29- 37

Barth, D. et al. 1994. Colonization and degradation of cattle dung: aspects of sampling.... Environ. Entomol. 23: 571-578.

Boyd, Howard P. 1995. Arthropods taken in pitfall traps in the pine barrens of New Jersey. Entomological News 106: 45-56.

Crossley, D. and M. Hoglund. 1962. A litter-bag method for the study of microarthropods inhabiting leaf litter. Ecology 43: 571-573.

Cummins, K. and M. Klug. 1979. Feeding Ecology of Stream Invertebrates. Annual Review of Ecology and Systematics 10: 147-172

Heard, S.. 1994. Pitcher-plant midges and mosquitoes: a processing chain commensalism. Ecology 75: 1647-1660.

Heinrich, B. and G. Bartholomew. 1979 Nov. The ecology of the African dung beetle. Sci. Am. 241(5): 146

Hohn, F. and J. Wagner. 2000. Larval substrates of Herminiine Noctuids...macrodecomposers of temperate leaf litter. Environ Entomol 29: 207-212.

Lenczewski, B. 1987. Natural history, colonization, and survival in a northern fungus-gardening ant, Trachymyrmex septentrionalis (Attini). Thesis, Florida State Univ.

Martin, M. and J. Martin. 1978. Cellulose digestion in the midgut of the fungus-growing termite…: The role of acquired digestive enzymes. Science 199: 1453-1455.

Merritt, Richard W. & J. Bruce Wallace. 1981. Filter-feeding insects. Scientific American. 244 (4): 132

Milne, L. and M. Milne. 1976 Aug. The social behavior of burying beetles. Sci. Am. 235(2): 84

Paquin, P. and D. Coderre. 1996. Sampling technique for soil macroarthropods inhabiting forest floors. Entomological News 107: 165-172.

Ribera, I. et al. 1999. Morphological diversity of ground beetles.... J Zool Lond 247: 1-18.

Snider, R. and R. Snider. 1997. Efficiency of arthropod extraction from soil cores. Entomological News 108: 203-208.

Tauber, M. et al. 1998. Moisture...in the seasonal ecology of insects.... Environ Entomol 27: 523-530.

Zimmerman, P. et al. 1982. Termites: a potentially large source of atmospheric methane.... Science 218: 563-565.

THE DETRITUS FOOD WEB

Most net primary productivity in terrestrial ecosystems is ultimately consumed via the detritus foodweb

Microbes and fungi are the primary consumers of plant detritus (leaves, flowers, fruits, stems, roots)

Animals graze on these and on the products they produce

Particles are crushed and further colonized by fresh microbial flora

The animals are in turn preyed on by others

Animal detritus (dung, excreta, carrion) also important

 

FOOD SOURCES IN THE DETRITUS CHAIN

  1. Plant debris

  2. Leaves

  3. Wood

  4. Fruit

  5. Fungi

  6. Dung

  7. Animal hair, skin, feathers, etc.

  8. Carrion

  9. Particulate organic matter in water

EXAMPLES OF DETRITUS FEEDING STRATEGIES

Leaves

  1. fungus gardens of ants, eg. Trachymyrmex septentrionalis

  2. so-called "compost-flies" (mainly acalypterate muscoid diptera)

  3. caterpillars of several groups of noctuid moths

8 genera studied (Hohn and Wagner 2000) including Idia, Renia, Zanclognatha

most can develop on air dried white oak leaves

larvae skeletonize leaves

experiments suggest they may not depend on epiphytic bacteria and fungi (Hohn and Wagner 2000)

Wood

  1. termites use symbiotic bacteria or protozoans may process 28% of terrestrial net production (see Zimmerman et al. 1982) Macrotermes are fungus gardeners in elaborates mound nests.

  2. bark beetles assisted by fungi to attack live wood

  3. sawflies, like the Alder Woodwasp from the film, Insect Parasitism

Fruit

Drosophila - yeasts a major source of nutrition

Fungi

  1. Diptera: Mycetophilidae and Sciaridae, can be pests of mushrooms

  2. numerous groups of fungus beetles

Dung

  1. Scarabeidae (some subfamilies) provision nest with ball of dung

  2. Muscoid flies, eg.Musca domestica

Animal debris

  1. Siphonaptera (flea larvae)

  2. Mallophaga

  3. some Diptera associated with bats

  4. clothes moths

  5. skin beetles - Dermestidae

  6. dust mites

Carrion

  1. Phoridae (coffin-flies)

  2. Silphidae (burying beetles)

  3. Dermestidae (skin beetles) pests in museums

  4. Sarcophagidae, Calliphoridae (Muscoidea, blow-flies)

Aquatic detritus

  1. Shredders - ingest coarse debris

  2. Plecoptera

    Trichoptera

    Tipulidae - crane flies

  3. Collectors

Chironomidae (midges, Diptera) often very abundant in polluted waters

Simulidae (blackflies)

Ephemeroptera

Trichoptera (net spinning)