Role of macroinvertebrates in nitrogen dynamics of a desert stream

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Abstract

Organismal N budgets were constructed for collector-gatherer macroinvertebrates and grazing snails of a Sonoran Desert Stream. Some 27% of ingested N was utilized in insect tissue production, 9-31% was excreted as ammonia, and the remainder (42-64%) was egested. Of N utilized in production, only 26% resulted in increased standing stock during a 20 d successional period. The remainder was lost to predation and non-predatory mortality (70%) or as emergent adult insects (4%). Snail excretion was 9-13%, and egestion was 26-39% of ingestion. Of N ingested by snails 50-68% was used in tissue production. As a percentage of N retained by the stream ecosystem, increased storage of N in insect biomass was 10%, insect emergence was 1%, and excretion recycled up to 70% of that amount back to the dissolved N compartment. Collector-gatherer macroinvertebrate influence on N dynamics, especially via recycling of excreted ammonia, increased over successional time. -from Author

Original languageEnglish (US)
Pages (from-to)1884-1893
Number of pages10
JournalEcology
Volume69
Issue number6
StatePublished - 1988

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macroinvertebrates
macroinvertebrate
snails
deserts
desert
insect
snail
collectors
insects
nitrogen
ammonia
excretion
Sonoran Desert
imagos
recycling
eclosion
biomass
ingestion
grazing
predation

ASJC Scopus subject areas

  • Ecology

Cite this

Role of macroinvertebrates in nitrogen dynamics of a desert stream. / Grimm, Nancy.

In: Ecology, Vol. 69, No. 6, 1988, p. 1884-1893.

Research output: Contribution to journalArticle

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