Dietary and taxonomic controls on incorporation of microbial carbon and phosphorus by detritivorous caddisflies

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• 作者：Halvor M. Halvorson ; Grant White ; J. Thad Scott ; Michelle A. Evans-White
• 关键词：Detritivores ; Leaf type ; Nutrient enrichment ; Ecological stoichiometry ; Radioisotopes
• 刊名：Oecologia
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：180
• 期：2
• 页码：567-579
• 全文大小：890 KB
• 参考文献：American Public Health Association (2005) Standard methods for the examination of water and wastewater. American Public Health Association, Washington
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• 作者单位：Halvor M. Halvorson (1)
  Grant White (1)
  J. Thad Scott (2)
  Michelle A. Evans-White (1)
  
  1. Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA
  2. Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

Heterotrophic microbes on detritus play critical roles in the nutrition of detritivorous animals, yet few studies have examined factors controlling the acquisition of microbial nutrients toward detritivore growth, which is termed “incorporation". Here, we assessed effects of detrital substrate identity (leaf type), background nutrients, and detritivore species identity on detritivore incorporation of microbial carbon (C) and phosphorus (P) in leaf litter diets. We fed oak and maple litter conditioned under two nutrient concentrations (50 or 500 µg P L−1) to the detritivorous caddisfly larvae Ironoquia spp., Lepidostoma spp., and Pycnopsyche lepida and used the radioisotopes 14C as glucose and 33P as phosphate to dually trace incorporation of microbial C and P by caddisflies. Incorporation efficiencies of microbial C (mean ± SE = 12.3 ± 1.3 %) were one order of magnitude higher than gross growth efficiencies for bulk detrital C from recent studies (1.05 ± 0.08 %). Litter type did not affect incorporation of microbial nutrients; however, caddisflies incorporated microbial P 11 % less efficiently when fed litter from the higher P concentration. Two lower body C:P species (Pycnopsyche and Ironoquia) exhibited 9.9 and 7.1 % greater microbial C and 19.0 and 17.7 % greater microbial P incorporation efficiencies, respectively, than the higher body C:P species (Lepidostoma). Our findings support ecological stoichiometry theory on post-ingestive regulation that animals fed lower C:P diets should reduce P incorporation efficiency due to excess diet P or alleviation of P-limited growth, and that lower C:P species must incorporate dietary C and P more efficiently to support fast growth of P-rich tissues. Keywords Detritivores Leaf type Nutrient enrichment Ecological stoichiometry Radioisotopes