Data Set (knb-lter-sbc.66.4)

SBC LTER: Nutrient concentrations and algae cover in the Ventura River catchment, California, 2008

  Summary and Data Links People and Organizations Temporal, Geographic and Taxonomic Coverage Methods and Protocols  

These methods, instrumentation and/or protocols apply to all data in this dataset:

Protocols and/or Procedures
Description:

Methods are described in the paper:

Klose, K., Cooper, S. D., Leydecker, A. D. and Kreitler, J. 2012. Relationships among catchment land use and concentrations of nutrients, algae, and dissolved oxygen in a southern California river. Freshwater Science, 2012, 31(3):908-927

Description:
Instrument(s): Lachat QuikChem 8000, Lachat Instruments, Milwaukee, Wisconsin
Instrument(s): Skalar Formacs HT TOC/TN Analyzer, Skalar Incorporated, Buford, Georgia
Instrument(s): inductively-coupled plasma atomic emmision spectrometry (ICP-AES), Thermo Jarrell Ash Corporation, Franklin, Massachusetts
Sampling Area and Study Extent
Sampling Description:

We selected sites along a gradient of percent human land use in the catchment. We chose 15 sites for algal and nutrient surveys, 10 on the main stem of the Ventura River (ST1-10), 3 reference sites above most human influences in the upper catchment (REF11-13), and 2 sites on downstream tributaries (DT1-2). Six mainstem sites (ST1-6) were below the Ojai Valley Wastewater Treatment Plant (WWTP), and 4 mainstem sites (ST7-10) were above the WWTP.

We sampled twice at each site (16 May - 5 June [June] and 31 August - 6 September [September] 2008). We established 10 equally spaced (10 m apart) cross- stream transects at each site and measured macroalgal % cover and chl a, water depth, substratum size, % open canopy, and water velocity along each transect (modified SWAMP Bioassessment Procedures 2007).

Sampling Area And Frequency: