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Full-Text Articles in Social and Behavioral Sciences
Habitat Associations Of Migrating And Overwintering Grassland Birds In Southern Texas, Lawrence Igl, Bart Ballard
Habitat Associations Of Migrating And Overwintering Grassland Birds In Southern Texas, Lawrence Igl, Bart Ballard
USGS Northern Prairie Wildlife Research Center
We report on the habitat associations of 21 species of grassland birds overwintering in or migrating through southern Texas, during 1991-1992 and 1992-1993. Ninety percent of our grassland bird observations were made during winter and spring, and only 10% occurred during fall. Grassland species made up a high proportion of the total bird densities in grassland and shrub-grassland habitats, but much lower proportions in the habitats with more woody vegetation. Fewer grassland species were observed in grassland and woodland than in brushland, parkland, and shrub-grassland habitats. Grassland birds generally were found in higher densities in habitats that had woody canopy …
Habitat Associations Of Migrating And Overwintering Grassland Birds In Southern Texas, Lawrence D. Igl, Bart M. Ballard
Habitat Associations Of Migrating And Overwintering Grassland Birds In Southern Texas, Lawrence D. Igl, Bart M. Ballard
USGS Northern Prairie Wildlife Research Center
We report on the habitat associations of 21 species of grassland birds over- wintering in or migrating through southern Texas, during 1991-1992 and 1992-1993. Ninety percent of our grassland bird observations were made during winter and spring, and only 10% occurred during fall. Grassland species made up a high proportion of the total bird densities in grassland and shrub-grassland habitats, but much lower proportions in the habitats with more woody vegetation. Fewer grassland species were observed in grassland and woodland than in brushland, parkland, and shrub-grassland habitats. Grassland birds generally were found in higher densities in habitats that had woody …
The Insignificance Of Statistical Significance Testing, Douglas H. Johnson
The Insignificance Of Statistical Significance Testing, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
Despite their wide use in scientific journals such as The Journal of Wildlife Management, statistical hypothesis tests add very little value to the products of research. Indeed, they frequently confuse the interpretation of data. This paper describes how statistical hypothesis tests are often viewed, and then contrasts that interpretation with the correct one. I discuss the arbitrariness of P-values, conclusions that the null hypothesis is true, power analysis, and distinctions between statistical and biological significance. Statistical hypothesis testing, in which the null hypothesis about the properties of a population is almost always known a priori to be false, is …
Effects Of Fire Retardant Chemical And Fire Suppressant Foam On Shrub Steppe Vegetation In Northern Nevada, Diane L. Larson, Wesley E. Newton, Patrick J. Anderson, Steven J. Stein
Effects Of Fire Retardant Chemical And Fire Suppressant Foam On Shrub Steppe Vegetation In Northern Nevada, Diane L. Larson, Wesley E. Newton, Patrick J. Anderson, Steven J. Stein
USGS Northern Prairie Wildlife Research Center
The objectives of this study were to determine the effects of fire retardant chemical (Phos-Chek G75-F*) and fire suppressant foam (Silv-Ex) application, alone and in combination with fire, on Great Basin shrub steppe vegetation. We measured growth, resprouting, flowering, and incidence of galling insects on Chrysothamnus viscidiflorus and Artemisia tridentata. These characteristics were not affected by any chemical treatment. We measured community characteristics, including species richness, evenness, and diversity, and number of stems of woody and herbaceous plants in riparian and upland plots. Of these characteristics, only species richness and number of stems/m2 clearly responded to the chemical …