End of experiment flume water chemistry

Costello, Kulacki, McCarthy, Tiegs, and Cardinale. 2018. Ranking stressor impacts on periphyton structure and function with mesocosm experiments and environmental-change forecasts. PLOS One. doi: xxx

Contact information:
David Costello
Kent State University
dcostel3@kent.edu

Context: 
Water chemistry (pH, nitrate, ammonium, and soluble reactive phosphorus) at the end of the flume mesocosm experiment. Flume mesocosms were either under control conditions or exposed to one of six stressors along a concentration gradient (elevated temperature, extinction, sediment, nitrogen, phosphorus, or salt). 

Temporal coverage:
The experiment was initiated on October 24, 2011 and ended on December 20, 2011. Data are from samples taken December 19 and 20.

Geographic coverage:
Experiment was completed in the Cardinale Lab experimental flume facility at the University of Michigan (Dana Building, University of Michigan, Ann Arbor, MI, USA). Stream water and algal inoculum for the streams was collected from the Huron River at the University of Michigan Nichols Arboretum in Ann Arbor, MI, USA (42°16′59.32″ N, 83°43′27.89″ W).

Data codes:
Temp - treatments with elevated temperature
Ext - treatments with altered algal inoculum to simulate extinction. Inoculum in control streams had 43 total taxa
Sed - treatments with elevated sedidment
Nitrogen - treatments with elevated nitrogen
Phosphorus - treatments with elevated phosphorus
Cl - treatments with elevated salinity (NaCl)
Control - flumes with no stressors added
SRP - Soluble reactive phosphorus

Attributes:
Name			Definition			Type		Units
FLUME			Unique flume ID			Discrete
TREAT			Stressor treatment of flume	Discrete
pH			Flume water pH			Continuous	Standard pH units
NO3			Nitrate nitrogen concentration	Continuous	µg/L NO3-N
NH4			Ammonium nitrogen concentration	Continuous	µg/L NH4-N
SRP			SRP concentration		Continuous	µg/L P

Detection limits:
NO3 - 20 µg/L
NH4 - 20 µg/L
SRP -  5 µg/L