Jump to Navigation

benthic

To what extent is there excess sediment in the Middle Truckee River that impairs aquatic life use?

Summary: 
Application of benthic macroinvertebrate bioassessment to determine whether there is habitat degradation from deposited sediments in the Middle Truckee River.
Primary Contact: 
Rights: 
Creative Commons - Commercial Use OK
Status: 
Completed
Date Range: 
2014-04-15

Goal:
Provide Biological Guidance for Sediment TMDL: Define deposited sediment guidelines for monitoring, protecting, and improving the biological health of the Middle Truckee River.
Objectives:
Describe patch-scale distribution of fine + sand (FS) deposits along the river at representative reaches below tributary stream confluences
Collect data to measure biotic responses and limiting effects of sediment at the patch-scale for both cover and volume of FS
Compare biological health to other large rivers of eastern Sierra that are less developed than MTR

Environmentalists remove aquatic weeds from Emerald Bay

Environmentalists are declaring victory after a population-growth control technique successfully eradicated most, if not all, remnants of an invasive aquatic plant from part of the floor of Emerald Bay near Swim Beach. Using a similar technique to kill invasive Asian clams, a partnership of local environmental agencies installed large swathes of bottom barriers to curtail the growth of Eurasian watermilfoil in Lake Tahoe.

In June, a partnership including Tahoe Resource Conservation District, California Department of Parks and Recreation and the Tahoe Regional Planning Agency placed more than 8,500 square feet of bottom barriers, according to Kim Boyd, Invasive Species manager at the conservation district.

TMWRF - Benthic Macroinvertebrate Monitoring

Summary: 
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.
Primary Contact: 
Rights: 
Creative Commons - Commercial Use OK
Status: 
Ongoing

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.

Syndicate content