Author: Jennifer S. Sauer
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 0
Book Description
In 1992, macroinvertebrate sampling was initiated in Pools 4, 8, 13, 26, and the Open River reach of the Mississippi River, and La Orange Pool of the Illinois River as part of the Long Term Resource Monitoring Program. Long-term monitoring is needed to detect population trends and local changes in aquatic ecosystems. Mayflies (Ephemeridae), fingernail clams (Sphaeriidae), and the exotic Asiatic clam (Corbicula) were selected for monitoring. Midges (Chironomidae) were added to the sampling design in 1993 and zebra mussels (Dreissena polymorpha) in 1995. Mayflies, fingernail clams, and midges, members of the soft-substrate community, were chosen because they play an important ecological role in the Upper Mississippi River System. Sampling was based on a stratified random design and was conducted at about 125 sites per study area. Mean densities of taxa were weighted by strata for extrapolation purposes. Pool 8 had the highest estimated mean densities of mayflies and fingernail clams (215 and 505 per m2, respectively). Pool 13 had the highest estimated mean number of midges (234 per m2). Overall, the impounded areas (including Lake Pepin) and the contiguous backwaters tended to support the highest mean densities of mayflies, fingernail clams, and midges. Substrates with predominantly a silt clay constituent supported the highest mean densities of mayflies, fingernail clams, and midges.
Long Term Resource Monitoring Program Annual Status Report, 1999
Author: Jennifer S. Sauer
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 0
Book Description
In 1992, macroinvertebrate sampling was initiated in Pools 4, 8, 13, 26, and the Open River reach of the Mississippi River, and La Orange Pool of the Illinois River as part of the Long Term Resource Monitoring Program. Long-term monitoring is needed to detect population trends and local changes in aquatic ecosystems. Mayflies (Ephemeridae), fingernail clams (Sphaeriidae), and the exotic Asiatic clam (Corbicula) were selected for monitoring. Midges (Chironomidae) were added to the sampling design in 1993 and zebra mussels (Dreissena polymorpha) in 1995. Mayflies, fingernail clams, and midges, members of the soft-substrate community, were chosen because they play an important ecological role in the Upper Mississippi River System. Sampling was based on a stratified random design and was conducted at about 125 sites per study area. Mean densities of taxa were weighted by strata for extrapolation purposes. Pool 8 had the highest estimated mean densities of mayflies and fingernail clams (215 and 505 per m2, respectively). Pool 13 had the highest estimated mean number of midges (234 per m2). Overall, the impounded areas (including Lake Pepin) and the contiguous backwaters tended to support the highest mean densities of mayflies, fingernail clams, and midges. Substrates with predominantly a silt clay constituent supported the highest mean densities of mayflies, fingernail clams, and midges.
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 0
Book Description
In 1992, macroinvertebrate sampling was initiated in Pools 4, 8, 13, 26, and the Open River reach of the Mississippi River, and La Orange Pool of the Illinois River as part of the Long Term Resource Monitoring Program. Long-term monitoring is needed to detect population trends and local changes in aquatic ecosystems. Mayflies (Ephemeridae), fingernail clams (Sphaeriidae), and the exotic Asiatic clam (Corbicula) were selected for monitoring. Midges (Chironomidae) were added to the sampling design in 1993 and zebra mussels (Dreissena polymorpha) in 1995. Mayflies, fingernail clams, and midges, members of the soft-substrate community, were chosen because they play an important ecological role in the Upper Mississippi River System. Sampling was based on a stratified random design and was conducted at about 125 sites per study area. Mean densities of taxa were weighted by strata for extrapolation purposes. Pool 8 had the highest estimated mean densities of mayflies and fingernail clams (215 and 505 per m2, respectively). Pool 13 had the highest estimated mean number of midges (234 per m2). Overall, the impounded areas (including Lake Pepin) and the contiguous backwaters tended to support the highest mean densities of mayflies, fingernail clams, and midges. Substrates with predominantly a silt clay constituent supported the highest mean densities of mayflies, fingernail clams, and midges.
1999 Annual Status Report
Author: Randy William Burkhardt
Publisher:
ISBN:
Category : Fish surveys
Languages : en
Pages :
Book Description
The Long Term Resource Monitoring Program (LTRMP) completed 2,692 collections of fishes from stratified random and permanently fixed sampling locations in six study reaches of the Upper Mississippi River System during 1999 Collection methods included day and night electrofishing, hoop netting, fyke netting (two net sizes), gill netting, seining, anchored trammel netting, and bottom trawling in selected aquatic area classes The six LTRMP study reaches arc Pools 4 (excluding lake Pepin), 8, 13, and 26 of the Upper Mississippi River, an unimpounded reach of the Mississippi River near Cape Girardeau, Missouri, and the La Grange Pool of the Illinois River. A total 66-76 fish species were detected in each study reach. For each of the six LTRMP study reaches, this report contains summaries of (1) sampling efforts for each combination of gear type and aquatic area class, (2) total catches of each species from each gear type, (3) mean catch-per-unit of effort statistics and standard errors for common species from each combination of a aquatic area class and selected gear type, and (4) length distributions of common species from selected gear types.
Publisher:
ISBN:
Category : Fish surveys
Languages : en
Pages :
Book Description
The Long Term Resource Monitoring Program (LTRMP) completed 2,692 collections of fishes from stratified random and permanently fixed sampling locations in six study reaches of the Upper Mississippi River System during 1999 Collection methods included day and night electrofishing, hoop netting, fyke netting (two net sizes), gill netting, seining, anchored trammel netting, and bottom trawling in selected aquatic area classes The six LTRMP study reaches arc Pools 4 (excluding lake Pepin), 8, 13, and 26 of the Upper Mississippi River, an unimpounded reach of the Mississippi River near Cape Girardeau, Missouri, and the La Grange Pool of the Illinois River. A total 66-76 fish species were detected in each study reach. For each of the six LTRMP study reaches, this report contains summaries of (1) sampling efforts for each combination of gear type and aquatic area class, (2) total catches of each species from each gear type, (3) mean catch-per-unit of effort statistics and standard errors for common species from each combination of a aquatic area class and selected gear type, and (4) length distributions of common species from selected gear types.
Annual Status Report, 1999
Author: Jennifer S. Sauer
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 21
Book Description
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 21
Book Description
Monthly Catalog of United States Government Publications
1996 Annual Status Report
Pipestone National Monument (N.M.), General Management Plan
CALFED Bay-Delta Program Programmatic EIS, Long-Term Comprehensive Plan to Restore Ecosystem Health and Improve Water Management, San Francisco Bay - Sacramento/San Joaquin River Bay-Delta D,Dsum; Program Goals and Objectives, Dapp1; No Action Alternative,
Mark Twain National Wildlife Refuge Complex
Author:
Publisher:
ISBN:
Category : Comprehensive conservation plans
Languages : en
Pages : 456
Book Description
Publisher:
ISBN:
Category : Comprehensive conservation plans
Languages : en
Pages : 456
Book Description
The Long-term Illinois River Fish Population Monitoring Program, F-101
Author: Michael A. McClelland
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 100
Book Description
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 100
Book Description
Scientific Investigations Report
Author: Sharon E. Kroening
Publisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 122
Book Description
Publisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 122
Book Description