DOI: 10.6073/pasta/833deb8efc4e6ecefba516212e37175c
title: Water Quality Data (Grab Samples) from the Shark River Slough, Everglades National Park (FCE LTER), Florida, USA, May 2001 - ongoing

description: Water quality samples are being collected using ISCO autosamplers at all Florida Coastal Everglades Long Term Ecological Research (FCE LTER) Program wetland sites (that is, all sites except TS/Ph-9, 10, and 11). The autosamplers contain 24 1L bottles. Water is sampled by programming the autosamplers to take composite samples once every 3 days. These samples are a composite of four 250mL subsamples drawn every 18 hours (a sampling scheme that captures a dawn, noon, dusk, and midnight sample in every three day composite). The samples are collected every 3-4 weeks and analyzed for total phosphorus (TP), total nitrogen (TN), and salinity. When sites are visited to collect these samples, we also collect a grab sample that is immediately put on ice. A portion of these grab samples is filtered through a filter (Whatman GF/F from 2000 to 2017 and Whatman polydisc GW from 2017 to ongoing) immediately upon return to the lab, and the filtered samples are analyzed for inorganic nutrients such as NO2-, NO3-, NH4+, SRP, and DOC. The unfiltered fraction of these grab samples is analyzed for TP and TN. We use these monthly grab samples to generate relationships between TP and SRP, and between TN and NO2- + NO3- + NH4+. Dissolved nutrients are measured using standard rapid flow analyzer (RFA) techniques. TP is analyzed with a modified Solorzano and Sharp (1980) technique. TN is measured with an ANTEK 9000N analyzer, TOC and DOC are quantified on a Shimadzu TOC Analyzer, and salinity is measured with a YSI conductivity meter or refractometer. In January 2007 a 6 days interval began for SRS1d, SRS2 & SRS3; the ISCOs did not change their sampling scheduled, they kept collecting water sample every 18 hours and switching bottles every three days; once in the lab, the 3 days was turned into 6 days by combining two bottles into 2 liters container. In addition to the regular water quality monitoring, we use the rain level actuators at all freshwater sites to trigger water sampling after rain events exceed a given threshold of duration and/or intensity. As currently programmed, when the threshold of = 2.5 cm of rain per hour is passed, the autosampler at that site collects a 1000mL sample 30 minutes after the threshold has been reached. Rain event samples are collected, treated, and analyzed as all other water quality samples.
 
 Related Shark River Slough water quality data packages:
 ISCO extensive water quality (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1072)
 Rainfall-driven autosampler water quality (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1253)
 Related Taylor Slough water quality data packages:
 ISCO extensive water quality from TS/Ph1a, TS/Ph1b (inactive), TS/Ph2, and TS/Ph3 (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1079)
 ISCO extensive water quality from TS/Ph6a, TS/Ph7a, and TS/Ph8 (inactive) (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1074)
 Grab sample water quality from TS/Ph1a, TS/Ph1b (inactive), TS/Ph2, and TS/Ph3 (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1080)
 Grab sample water quality from TS/Ph6a, TS/Ph7a, and TS/Ph8 (inactive) (https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-fce&identifier=1075)