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TMWRF - Benthic Macroinvertebrate Monitoring

Four sites on mainstem Truckee River are monitored for benthic macroinvertebrates: three below TMWRF discharge point, and one above. Riffle habitat is sampled in 10-15 inches of water, with substrate between fines and four inch cobble size.
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Equipment used: Hess sampler with 500 mesh netting. Area sampled: 0.256 m2 per sample, and three replicate samples are taken at each site. Subsampling: approx. 10-15% of samples must be halved due to richness, but counts over 200 are maintained whenever possible. Taxonomic level:  to genus and species, except for Diptera chironomids, which are identified to subfamily or tribe level. Oligochaetes are identified to family level.

QA: Type specimens are confirmed by Idaho State University, Stream Ecology Center; Type specimen collection established and archived to demonstrate past id's and for future verification of specimens. Library of general and taxon specific texts and monographs for sample handling, collection and identification. Bibliography of texts, keys, monographs, etc. are available.

Analysis/metrics: Idenfication and enumeration of invertebrates and invertebrate biomass determinations. No metrics are applied.

Data Availability and Mode of Storage: TMWRF FoxPro database and hard copies of quarterly data for past 23 years.

Purpose of monitoring: NPDES permit for TMWRF.

Geographic Coverage: Four sites: GPS coordinates.
#3 at East McCarren bridge, grabs downstream side of bridge, benthics downstream side in river. Sonde was removed around 2008. 39 deg/ 31'02" x 119 deg 44'23"
#4 Below Lockwood at the old bridge for grab samples. BMI samples in river upstream of the bridge. 39 deg/ 30'33" x 119 deg 38'58"
#5 Old Clark bridge at USA Parkway (Benthics in river, grabs downstream side of bridge). Sonde monitoring is performed at the old Tracy bridge at Powerplant. 39 deg. 33'80" x 119 deg 29'29"
#7 Dead Ox, benthic sampling only 39 deg. 44'44" x 119 deg 19'20" (permit states Wadsworth but site was switched).

Date Range: 1985 - 9/2013

TMWRF bensamid.xls38.5 KB
TMWRF benthid.xls32 KB
TMWRF benvalu.xls188.5 KB
2010 Benthic Macroinvertebrate Data.xls244 KB
2011 Benthic Macroinvertebrate Data.xls161.5 KB
2012 Benthic Macroinvertebrate Data.xls127 KB
tmwrfdataDRI2013BMIAdj.xlsx892.46 KB