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Submersed aquatic vegetation, dominated by Vallisneria americana Michx., declined dramatically in Lake Onalaska (Navigation Pool 7, on the Upper Mississippi River) following drought conditions in the late 1980s. Coinciding with the decline were marked increases in the abundance of phyllum spicatum L., particularly in areas vacated by A. americana. Recent evidence indicates that much of the lake has remained unvegetated, but that since 1994, beds of V. americana have made a partial recovery. While the production of vegetative propagules may largely account for increases in populations of both species, the extent to which seed production may contribute to their expansion in the lake is unknown. To assess the germination...
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The effects of chlorpyrifos, an organophosphorus insecticide, were examined on the activity of the nervous system enzyme acetylcholinesterase (AChE) in the threeridge mussel Amblema plicata in a 24-day laboratory test. Thirty-six mussels in each of seven treatments (18 mussels per duplicate) were exposed to chlorpyrifos (0.1, 0.2, 0.3, 0.6, and 1.2 mg/L), a solvent (acetone), and a solvent-free (well water) control for 12, 24, or 96 h. The activity of AChE was measured in the anterior adductor muscle of eight mussels from each treatment after exposure. To assess potential latent effects, six mussels from each treatment were removed after 24 h of exposure and transferred to untreated water for a 21-day holding period;...
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Laboratory tests of nine species of fish as hosts for glochidia of Lampsilis higginsi Lea indicated that four species were fully suitable: largemouth bass (Micropterus salmoides Lacepede), smallmouth bass (M. dolomieui Lacepede), walleye (Stizostedion vitreum vitreum Mitchill), and yellow perch (Perca flavescens Mitchill). Juvenile L. higginsi also developed on green sunfish (Lepomis cyanellus Rafinesque) but some fish sloughed their infections prematurely.
Categories: Publication; Types: Citation; Tags: Malacological Review
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The selection of a distributional assumption suitable for modelling macroinvertebrate density data is typically challenging. Macroinvertebrate data often exhibit substantially larger variances than expected under a standard count assumption, that of the Poisson distribution. Such overdispersion may derive from multiple sources, including heterogeneity of habitat (historically and spatially), differing life histories for organisms collected within a single collection in space and time, and autocorrelation. Taken to extreme, heterogeneity of habitat may be argued to explain the frequent large proportions of zero observations in macroinvertebrate data. Sampling locations may consist of habitats defined qualitatively...
Categories: Publication; Types: Citation; Tags: Ecological Modelling
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Like other large rivers, the Upper Mississippi River System (UMRS) serves a diversity of roles. The UMRS provides commercial and recreational fishing, floodplain agriculture, drinking water for many communities, an important bird migration pathway, a variety of recreational activities, and a navigation system that transports much of the country's agricultural exports. These multiple roles present significant management challenges. Regular assessment of the condition of the river is needed to improve management plans and evaluate their effectiveness. This report provides a summary of the recent status (mean and range of conditions) and trends (change in direction over time) for 24 indicators of the ecological condition...
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Water quality monitoring is invaluable to ensure compliance with regulations, detect trends or patterns, and advance ecological understanding. However, monitoring typically measures only a few characteristics in a small fraction of a large and complex system, and thus the information contained in monitoring data depends upon which features of the ecosystem are actually captured by the measurements. Difficulties arise when these data contain something other than intended, but this can be minimized if the purpose of the sampling is clear, and the sampling design, measurements, and data interpretations are all compatible with this purpose. The monitoring program and data interpretation must also be properly matched...
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American wildcelery, Vallisneria americana Michx. is an ecologically important component of aquatic communities in the Upper Mississippi River (UMR). We conducted a study in 2002 to determine the association of several abiotic factors on the vegetative growth of Vallisneria in Navigation Pool 8 (Pool 8) of the UMR. We measured turbidity, percent light absorbance, surface water ammonium, surface water nitrate, current velocity, conductivity, pH and water depth throughout one growing season at 56 stratified sites based on where Vallisneria occurred in previous years. Sediment and aboveground biomass samples were collected during peak growth. Sediment was analysed for organic content, particle size, pore water nitrate...
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Glochidia of the endangered unionid mussel Lampsilis higginsi (Lea) are morphologically similar to those of several other species in the upper Mississippi River. Life history details, such as the timing of reproduction and identity of host fish, can be readily studied if the glochidia of L. higginsi can be distinguished from those of related species. Authors used light and scanning electron microscopy and statistical analyses of three shell measurements, shell length, shell height, and hinge length, to compare the glochidia of L. higginsi with those of L. radiata siliquoidea (Barnes), L. ventricosa (Barnes), and Ligumia recta (Lamarck). Glochidia of L. higginsi were differentiated by scanning electron microscopy...
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The association of young-of-the-year northern pike (Esox lucius) with different aquatic plant types (e.g., submerged, emergent, floating) was studied to evaluate the impacts of a potential loss of backwaters on available fish nursery habitats in the upper Mississippi River. Eight biweekly collections were made at each of six representative lentic habitats in Navigation Pool 7. In the spring, average catches of northern pike from areas with submerged vegetation were nearly three times greater than from areas with emergent vegetation, and more than 10 times greater than from an area with no vegetation. This pattern was consistent until late summer, when the young became more common in the more highly oxygenated, less...
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Abstract has not been submitted
Categories: Publication; Types: Citation; Tags: Science
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We evaluated the potential loss of target benthic macroinvertebrates from coarse-mesh field wash down of samples through a 1.18-mm mesh sieve nested on a 0.60-mm mesh sieve. Visible target organisms (midges, mayflies, and fingernail clams) in the 1.18-mm mesh sieve were removed from the sample and enumerated in the field. The entire contents of both sieves were preserved for subsequent laboratory enumeration under 4X magnification. Percent recoveries from each treatment were based on total intact organisms found in all sieves. Percent recovery for fingernail clams found in the field (31%) was lower than for mayflies (79%) and midges (88%). Laboratory enumeration of organisms retained by the 1.18-mm sieve yielded...
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Weed shiners are listed as endangered in Iowa. In the spring of 1990, one weed shiner (Notropis texanus) was collected from the Crooked Slough Complex, Pool 13 (river mile 554.3) of the Upper Mississippi River System. Prior to this study, there is no record of weed shiners collected in Pool 13. After the initial collection, a follow-up search for weed shiners was undertaken during fall 1990, and during late summer and fall 1991, to estimate relative abundance at this site. The Crooked Slough collection site was seined on three separate occasions, and 1,840 fish were collected. No additional weed shiners were captured. Therefore, the collection efforts do not support the hypothesis that the Crooked Slough collection...
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The annual variability in mayflies (Ephemeroptera), fingernail clams (Sphaeriidae), and midges (Chironomidae) in six study areas of the Upper Mississippi River System from 1992 to 1995 was examined. Spatial distribution is also discussed for these organisms along with the Asiatic clam (Corbicula fluminea) and the zebra mussel (Dreissena polymorpha). Sample allocation within each reach was based on a stratified random design where strata were aquatic areas. No significant linear trends across years were found in estimated reachwide mean number of organisms. However, the overall test for differences in intercepts among study areas was statistically significant (P < 0.05) for mayflies, fingernail clams, and midges....
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Satellite images offer an alternative to aerial photography in mapping applications where large area coverage at brief time intervals is required. Their digital format allows either visual or automated interpretation, with immediate incorporation into a geographic information system. Their primary disadvantage is a coarser spatial resolution. This study combined the benefits of (1) the 10-m spatial resolution of SPOT panchromatic (PAN) images, (2) the added spectral information of Landsat Thematic Mapper's (TM) mid-infrared bands, and (3) digital classifications to map terrestrial and aquatic cover types in the Mississippi and Illinois River floodplains. The PAN and the six non-thermal TM bands were combined using...
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A depth-integrated finite-element model (RMA-2V) was applied on a section of the Upper Mississippi River to study the hydraulic characteristics of the floodplain-river system. The area that has been modeled is called "Montrose Flats." Aquatic vegetation is abundant at this location, and the flow structure needs to be evaluated in order to study the nutrient transport conditions within this area. The present study focused on a large oval eddy that was observed to form in this area near the downstream end of the Devil's Creek delta. Causative factors for this eddy were examined by using this numerical model. Results indicate that the eddy can be simulated by this model and that numerical study is a feasible way to...
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Macrophyte populations have recently decreased in the Upper Mississippi River (UMR). This decline may be due to abiotic factors, such as a reduction in nutrients; however, biotic factors are also suspect. The common carp Cyprinus carpio has been reported to affect submerged macrophyte populations in other systems but not in the UMR. This study was conducted to determine if common carp can directly or indirectly reduce submerged macrophyte biomass. Twelve enclosures (25 m2) and four reference sites were constructed in Lawrence Lake, a backwater in the UMR, and stocked with one of three densities (0, 1, 10) of common carp. High densities of common carp (10/enclosure or approximately 7000 kg/ha) significantly reduced...


map background search result map search result map Two-dimensional hydrodynamic modeling of a reach of the Mississippi River in Pool 19 The status of the weed shiner (Notropis texanus) in Pool 13 of the Upper Mississippi River Geospatial application:  Assessment of merged Landsat TM and SPOT panchromatic data for Pool 26, Upper Mississippi River System Effects of common carp (Cyprinus carpio) on submerged macrophytes and water quality in a backwater lake on the Upper Mississippi River Temporal analyses of select macroinvertebrates in the Upper Mississippi River System, 1992-1995 Unusual coloration in a red-eared slider, Trachemys scripta elegans Long Term Resource Monitoring Program Procedures: Water quality monitoring Modeling fingernail clam (Family: Sphaeriidae) abundance-habitat associations at two spatial scales using hierarchical count models Geospatial application:  Assessment of merged Landsat TM and SPOT panchromatic data for Pool 26, Upper Mississippi River System The status of the weed shiner (Notropis texanus) in Pool 13 of the Upper Mississippi River Two-dimensional hydrodynamic modeling of a reach of the Mississippi River in Pool 19 Effects of common carp (Cyprinus carpio) on submerged macrophytes and water quality in a backwater lake on the Upper Mississippi River Temporal analyses of select macroinvertebrates in the Upper Mississippi River System, 1992-1995 Unusual coloration in a red-eared slider, Trachemys scripta elegans Long Term Resource Monitoring Program Procedures: Water quality monitoring Modeling fingernail clam (Family: Sphaeriidae) abundance-habitat associations at two spatial scales using hierarchical count models