new jersey department of environmental protection  
Water Monitoring & Standards

NJDEP Bureau of Freshwater and Biological Monitoring Home Page

 
AMNET reports
reports

- AMNET -
Benthic Macroinvertebrate Sampling

 

site AN0043, Pequest River @ Rt 625, White Twp.
map of AMNET sampling sites
map
 

 

In 1992, the Bureau of Freshwater & Biological Monitoring reactivated its Ambient Biomonitoring Network (AMNET) which, at the time of its last sampling in 1988, consisted of only 18 sampling sites statewide. The old network was determined to be inadequate to support the department's 305(b) [water quality inventory report], 303(d) [list of impaired waters] and watershed programs, so bureau staff designed a new program.

The new AMNET program established sampling stations in each of the 20 freshwater Water Management Areas, statewide, where the health of instream benthic macroinvertebrate (sometimes called bottom-dwelling "bugs") communities are evaluated using a USEPA-developed statistical methodology referred to as Rapid Bioassessment Protocol (RBP). Under AMNET, each of the State's five major Water Regions are sampled for benthic macroinvertebrates (bottom dwelling organisms visible to the naked eye) on a rotational schedule of once every five years. Visual observations, Stream Habitat Assessments and limited physical/chemical parameters are performed on each site. To date, all of the major drainage basins have been biologically monitored for the third time with over 760 non-tidal sampling sites established. A video of our sampling procedure for a southern stream can be found on DEP's Barnegat Bay Sampling Videos web page. The Chapter 3 video shows an example of sampling a Pinelands stream.

The AMNET results have been incorporated into the National Environmental Performance Partnership System (NEPPS) as a primary environmental indicator of water quality impairment. Statewide AMNET monitoring is a commitment in the NEPPS PPA with EPA Region 2, and a key element of NJ's Long-term Water Monitoring and Assessment Strategy. Other uses of the AMNET data include:

AMNET reports of results are published by the bureau as analysis of each Water Region is completed; copies are available from this web site. The biological and habitat ratings are also available from this web site for Round 1, Round 2, Round 3, and Round 4 (in part) data. The chemical and biological data will also soon be available from STORET, EPA's computerized data system. GIS data shapefiles cans be found at this address: http://dep-inet2.dep.state.nj.us/gis/stateshp.html#AMNET

 

New Metrics:

AMNET employs a multimetric index approach for assessment of biological condition, and regulatory thresholds for use attainment. New Jersey benthic macroinvertebrate communities can be statistically grouped into three distinct structures based on geographical regions: high gradient (above the Fall Line), low gradient (Coastal Plain excluding the Pinelands), and Pinelands. To accurately assess biological condition, an index was developed for each distinct region using guidelines outline in USEPA's Rapid Bioassessment Protocols (RBP) for Use in Wadeable Streams and Rivers. The indices assess sites from two perspectives: the condition of the macroinvertebrate community and the regulatory use attainment. An assessment framework was outlined to address both concerns, and a development report was prepared for each index: High Gradient Macroinvertebrate Index (HGMI), Coastal Plain Macroinvertebrate Index (CPMI), and the Pinelands Macroinvertebrate Index (PMI).

A Standard Operating Procedure (SOP) is available for all aspects of the AMNET program including sampling, analysis, assessment, and a summary of the index development and scoring criteria.


contact us privacy notice legal statement

 

http://www.state.nj.us/dep/wms/bfbm

wms: wms home | bfbm home | what's new | table of contents | contact us

department: njdep home | about dep | index by topic | programs/units | dep online
statewide: njhome | my new jersey | people | business | government | departments | search

Copyright © State of New Jersey, 1996-2013
Department of Environmental Protection
P. O. Box 402
Trenton, NJ 08625-0402

Last Updated: June 18, 2014

njdep homeabout depindex by topicprograms and unitsdep online nj homemy new jerseynj peoplenj businessnj governmentdepartments