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Consumer-resource stoichiometry in detritus-based streamsAuthor(s): Wyatt F. Cross; Jonathan P. Benstead; Amy D. Rosemond; J. Bruce Wallace
Source: Ecology Letters. 6: 721-732
Publication Series: Miscellaneous Publication
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DescriptionStoichiometric relationships between consumers and resources in detritus-based ecosystems have received little attention, despite the importance of detritus in most food webs. We analysed carbon (C), nitrogen (N), and phosphorus (P) content of invertebrate consumers, and basal food resources in two forested headwater streams (one reference and the other nutrient-enriched). We found large elemental imbalances between consumers and food resources compared with living plant-based systems, particularly in regard to P content, which were reduced with enrichment. Enrichment significantly increased nutrient content of food resources (consistent with uptake of N and P by detritus-associated microbes). P content of some invertebrates also increased in the enriched vs. reference stream, suggesting deviation from strict homeostasis. Nutrient content varied significantly among invertebrate functional feeding groups, orders and, to some extent, size classes. Future application of stoichiometric theory to detritus-based systems should consider the potential for relatively large consumer-resource elemental imbalances and P storage by insect consumers.
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CitationCross, Wyatt F.; Benstead, Jonathan P.; Rosemond, Amy D.; Wallace, J. Bruce. 2003. Consumer-resource stoichiometry in detritus-based streams. Ecology Letters. 6: 721-732
KeywordsCarbon, nitrogen, phosphorus, detritus, ecological stoichiometry, experimental enrichment, food web, insect, invertebrate, stream
- Whole-system nutrient enrichment increases secondary production in a detritus-based ecosystem
- Variation in Detrital Resource Stoichiometry Signals Differential Carbon to Nutrient Limitation for Stream Consumers Across Biomes
- Convergence of detrital stoichiometry predicts thresholds of nutrient-stimulated breakdown in streams
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