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A number of statistical approaches have been developed to quantify the overall trend in river water quality, but most approaches are not intended for reporting separate trends for different flow conditions. We propose an approach called FN2Q, which is an extension of the flow-normalization (FN) procedure of the well-established WRTDS (“Weighted Regressions on Time, Discharge, and Season”) method.
Suárez CF, Paez-Vasquez M, Trujillo F, Usma JS, Thieme M, Bassi AM, Naranjo LG, Costanzo S, Manrique O, Pallaske G, and Flechas J ·
The Orinoco river basin is the third largest river in the world by volume. Its catchment encompasses 27 major sub-basins including the Bita with a catchment area of about 825,000 ha, which originates in the Colombian high plains in the Llanos ecoregion.
The Chesapeake Bay Program maintains an extensive nontidal monitoring network, measuring nitrogen and phosphorus (nutrients) at more than 100 locations on rivers and streams in the watershed. Data from these locations are used by USGS to assess the ecosystem’s response to nutrient-reduction efforts.
Dennison WC, Bracken MES, Brown M, Bruno JF, Carlton JT, Carpenter RC, Carruthers TJB, Dethier MN, Duarte CM, Fisher TR, Fourqurean JW, Grosberg RK, Hamdan LJ, Heck KL, Howard DJ, Hughes AR, Hughes BB, Kendrick GA, Kenworthy WJ, Mars F, McRoy CP, Naylor RL, Nyden B, Ogden JC, Olyarnik S, Orth RJ Short FT, Sorte CJB, Stachowicz JJ Strong DR, Sur C, Waycott M ·
Susan Lynn Williams (1951–2018) was an exceptional marine ecologist whose research focused broadly on the ecology of benthic nearshore environments dominated by seagrasses, seaweeds, and coral reefs. She took an empirical approach founded in techniques of physiological ecology. Susan was committed to applying her research results to ocean management through outreach to decision-makers and resource managers.
Understanding the temporal and spatial roles of nutrient limitation on phytoplankton growth is necessary for developing successful management strategies. Chesapeake Bay has well-documented seasonal and spatial variations in nutrient limitation, but it remains unknown whether these patterns of nutrient limitation have changed in response to nutrient management efforts.
El presente documento contiene los principales conceptos, notas, procesos y consideraciones necesarias para emprender una tarjeta de reporte. Debido a que las tarjetas de reporte involucran diversas etapas y actividades, resulta necesario conocer cada una de ellas a profundidad para tener claridad en este proceso.
Keisman J, Murphy RR, Devereux OH, Harcum J, Karrh R, Lane M,
Perry E, Webber J, Wei Z, Zhang Q, Petenbrink M ·
The Potomac Tributary Report summarizes change over time in a suite of monitored tidal water quality parameters and associated potential drivers of those trends for the time period 1985 – 2018, and provides a brief description of the current state of knowledge explaining these observed changes.
Anthropogenic inputs of nutrients via river runoff are the primary drivers of ecosystem degradation in Chesapeake Bay (CB) and the northern Adriatic Sea (NAS). The annual cycle of river flow is typically unimodal in CB (seasonal peak during spring) and bimodal in the NAS (peaks during April–June and October–December). Dissolved inorganic nitrogen accounts for most of the total nitrogen (TN) in both systems.
Nutrient and sediment transport exhibit strong spatial and temporal inequality, with a small percentage of locations and events contributing to the vast majority of total annual loads. The processes for determining how to reduce total annual loads at a watershed scale often target spatial, but not temporal, components of inequality.
