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Filters: Types: OGC WMS Service (X) > partyWithName: Brian R Gray (X)

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Net sedimentation rates were obtained for backwaters of the Upper Mississippi River in Pools 4, 8, and 13 by measuring annual bed elevation changes along transects between 1997 and 2001. Average sedimentation rates (cmּyr�1) during the 5-yr period were lower than most previously reported rates in backwaters of the River, with means of –0.08 (standard error [SE] = 0.18) in Pool 4, 0.21 (SE = 0.10) in Pool 8, and 0.47 (SE = 0.26) in Pool 13.�Poolwide estimated mean sedimentation rates in the terrestrial areas adjacent to backwaters appeared higher, ranging from 0.32 (SE = 0.14) to 0.78 (SE = 0.25) cmּyr�1, but were not significantly different than rates in aquatic areas.�When averaged over the study period, sedimentation...
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We sampled vegetation and breeding birds in Upper Mississippi River floodplain forest edge and interior areas to (1) measure Phalaris cover and (2) evaluate if the breeding bird assemblage responded to differences in Phalaris cover or other forest structure variables. Data are counts of birds collected during 3 surveys within 50m at each site using 10 minute point count methods. Vegetation was sampled using a releve technique at the bird count point within 10m of the point.
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Detailed point center quarter sampling (Mueller-Dombois and Ellenberg 1974) was conducted during late June along a 150-m long transect that started at a bird survey point. Four plots were sampled corresponding to the start, 50m, 100m and end points of each transect. At each of these four sample plots, species, diameter at breast height (dbh) and distance from the center of the plot were recorded tor trees (>8cm dbh) and saplings (≤8cm dbh). Number of standing snags (>8cm dbh and over 2 m tall) within 25m of the plot center were counted. Total basal area of each plot was estimated using a size 10 angle gauge and averaged over the four plots in each transect. As well, height of a representative canopy tree and understory...


    map background search result map search result map Rates and patterns of net sedimentation in backwaters of Pools 4, 8, and 13 of the Upper Mississippi River Cumulative effects of restoration efforts on ecological characteristics of an open water region within the Upper Mississippi River Modeling fingernail clam (Family: Sphaeriidae) abundance-habitat associations at two spatial scales using hierarchical count models Selecting a distributional assumption for modelling relative abundances of benthic macroinvertebrates Evaluation of aquatic macrophyte community response to island construction in the Upper Mississippi River Comparing the effects of local, landscape, and temporal factors on forest bird nest survival using logistic-exposure models Vermillion/Cannon River Bottoms Important Bird Area Raw Breeding bird survey data Vermillion/Cannon River Bottoms raw vegetation data from transect data Vermillion/Cannon River Bottoms raw vegetation data from transect data Vermillion/Cannon River Bottoms Important Bird Area Raw Breeding bird survey data Rates and patterns of net sedimentation in backwaters of Pools 4, 8, and 13 of the Upper Mississippi River Cumulative effects of restoration efforts on ecological characteristics of an open water region within the Upper Mississippi River Modeling fingernail clam (Family: Sphaeriidae) abundance-habitat associations at two spatial scales using hierarchical count models Selecting a distributional assumption for modelling relative abundances of benthic macroinvertebrates Evaluation of aquatic macrophyte community response to island construction in the Upper Mississippi River Comparing the effects of local, landscape, and temporal factors on forest bird nest survival using logistic-exposure models