01954nas a2200181   4500008004100000245005600041210005400097300001400151490000600165520144900171653001901620653001301639653001501652653001201667100001801679700001601697856005901713       2016                        eng d00aNitrogen, phosphorus, and eutrophication in streams0 aNitrogen phosphorus and eutrophication in streams  a155 - 1640 v63 a<p>Flowing waters receive substantial nutrient inputs, including both nitrogen (N) and phosphorus (P), in many parts of the world. Eutrophication science for rivers and streams has unfortunately lagged behind that for lakes, and results from lakes might inform those interested in stream eutrophication. A key controversy in lake eutrophication science is the relative importance of controlling P and N in water quality management, and we are interested how the science of this controversy transfers to flowing waters. A literature review indicates (1) stream benthic chlorophyll is significantly correlated to both total N and total P in the water column, with both nutrients explaining more variance than either considered alone; (2) nutrients have increased substantially in many rivers and streams of the United States over reference conditions, and strong shifts in N and P stoichiometry have occurred as well; (3) bioassays often indicate N responses alone or in concert with P responses for autotrophic (primary production and chlorophyll) and heterotrophic (respiration) responses; (4) both heterotrophic and autotrophic processes are influenced by the availability of N and P; and (5) N-fixing cyanobacteria usually do not seem to be able to fully satisfy N limitations in rivers and streams when P is present in excess of N. These data suggest both N and P control should be considered in the eutrophication management of streams.</p>10aeutrophication10anitrogen10aPhosphorus10astreams1 aDodds, W., K.1 aSmith, V.H.  uhttps://www.tandfonline.com/doi/abs/10.5268/IW-6.2.90901988nas a2200145   4500008004100000245008800041210006900129300001300198490000700211520145900218100001801677700001601695700001501711856011601726       2002                        eng d00aNitrogen and phosphorus relationships to benthic algal biomass in temperate streams0 aNitrogen and phosphorus relationships to benthic algal biomass i  a865 -8740 v593 aKnowledge of factors limiting benthic algal (periphyton) biomass is central to understanding energy flow in stream ecosystems and stream eutrophication. We used several data sets to determine how water column nutrients and nonnutrient factors are linked to periphytic biomass and if the ecoregion concept is applicable to nutrientperiphyton relationships. Literature values for seasonal means of biomass of periphyton, nutrient concentrations, and other stream characteristics were collected for almost 300 sampling periods from temperate streams. Data for benthic chlorophyll and nutrient concentrations from a subset of 620 stations in the United States National Stream Water-Quality Monitoring Networks were also analyzed. The greatest portion of variance in models for the mean and maximum biomass of benthic stream algae (about 40%) was explained by concentrations of total N and P. Breakpoint regression and a two-dimensional KolmogorovSmirnov statistical technique established significant breakpoints of about 30 µg total P·L1 and 40 µg total N·L1, above which mean chlorophyll values were substantially higher. Ecoregion effects on nutrientchlorophyll relationships were weak. Ecoregion effects were cross-correlated with anthropogenic effects such as percent urban and cropland area in the watershed and population density. Thus, caution is necessary to separate anthropogenic effects from natural variation at the ecoregion level.1 aDodds, W., K.1 aSmith, V.H.1 aLohman, K.  uhttp://lter.konza.ksu.edu/content/nitrogen-and-phosphorus-relationships-benthic-algal-biomass-temperate-streams