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Filters: Tags: DAKOTA (X) > partyWithName: Brian R Gray (X) > Types: OGC WMS Layer (X) > Types: OGC WFS Layer (X) > Types: OGC WMS Service (X)

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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 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