Stream nutrient enrichment has a greater effect on coarse than on fine benthic organic matter Tant, Cynthia J. Rosemond, Amy D. First, Matthew R. 2013-12-30T15:59:04Z 2014-10-22T08:57:20Z 2013-09-17
dc.description Author Posting. © Society for Freshwater Science, 2013. This article is posted here by permission of Society for Freshwater Science for personal use, not for redistribution. The definitive version was published in Freshwater Science 32 (2013): 1111-1121, doi:10.1899/12-049.1. en_US
dc.description.abstract Nutrient enrichment affects bacteria and fungi associated with detritus, but little is known about how biota associated with different size fractions of organic matter respond to nutrients. Bacteria dominate on fine (<1 mm) and fungi dominate on coarse (>1 mm) fractions, which are used by different groups of detritivores. We measured the effect of experimental nutrient enrichment on fungal and bacterial biomass, microbial respiration, and detrital nutrient content on benthic fine particulate organic matter (FPOM) and coarse particulate organic matter (CPOM). We collected FPOM and CPOM from 1 reference and 1 enriched stream. CPOM substrates consisted of 2 litter types with differing initial C:nutrient ratios (Acer rubrum L. and Rhododendron maximum L.). Fungal and bacterial biomass, respiration, and detrital nutrient content changed with nutrient enrichment, and effects were greater on CPOM than on FPOM. Fungal biomass dominated on CPOM (99% total microbial biomass), whereas bacterial biomass dominated on FPOM (95% total microbial biomass). These contributions were unchanged by nutrient enrichment. Bacterial and fungal biomass increased more on CPOM than FPOM. Respiration increased more on CPOM (up to 300% increase) than FPOM (50% increase), indicating important C-loss pathways from these resources. Microbial biomass and detrital nutrient content were positively related. Greater changes in nutrient content were observed on CPOM than on FPOM, and changes in detrital C:P were greater than changes in detrital C:N. Threshold elemental ratios analyses indicated that enrichment may reduce P limitation for shredders and exacerbate C limitation for collector-gatherers. Changes in CPOM-dominated pathways are critical in predicting shifts in detrital resource quality and C flow that may result from nutrient enrichment of detritus-based systems. en_US
dc.description.embargo 2014-09-17 en_US
dc.description.sponsorship This study and preparation of this manuscript were supported by National Science Foundation grants DEB-0318063 (to ADR, K. Suberkropp, B. Wallace, and M. Black) and DEB-0918894 (to ADR, J. Benstead, V. Gulis, and J. Maerz) and an Odum School of Ecology Graduate Research grant to CJT. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Freshwater Science 32 (2013): 1111-1121 en_US
dc.identifier.doi 10.1899/12-049.1
dc.language.iso en_US en_US
dc.publisher Society for Freshwater Science en_US
dc.subject Nitrogen en_US
dc.subject Phosphorus en_US
dc.subject Headwater stream en_US
dc.subject Carbon en_US
dc.subject Detritus en_US
dc.subject Shredder en_US
dc.subject Fungi en_US
dc.subject Bacteria en_US
dc.subject Aquatic en_US
dc.subject Freshwater en_US
dc.subject Coweeta Hydrologic Laboratory en_US
dc.subject Southern Appalachian Mountains en_US
dc.title Stream nutrient enrichment has a greater effect on coarse than on fine benthic organic matter en_US
dc.type Article en_US
dspace.entity.type Publication
relation.isAuthorOfPublication 125e6f59-9270-4b22-becc-cfb0286be637
relation.isAuthorOfPublication 86d29f3e-ff92-42ae-8651-72827e33ae93
relation.isAuthorOfPublication 5c05ec33-c132-4ff7-bb84-9397001a2073
relation.isAuthorOfPublication.latestForDiscovery 125e6f59-9270-4b22-becc-cfb0286be637
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