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Filters: Tags: landscape conservation cooperatives (X) > partyWithName: Plains & Prairie Potholes LCC Data Manager (X) > partyWithName: Victoria J Dreitz (X)

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In this thesis I explore a derivation of the MSAM using the DDO survey method to create a multispecies dependent double-observer abundance (MDAM) model. I use this tool to explore how two widely used grazing systems affect the abundance of eight songbird species with varying reliance on grassland vegetation in a sagebrush ecosystem.
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Conservation of biological communities requires accurate estimates of abundance for multiple species. Recent advances in estimating abundance of multiple species, such as Bayesian multispecies N-mixture models, account for multiple sources of variation, including detection error. However, false-positiveerrors (misidentification or double counts), which are prevalent in multispecies data sets, remain largely unaddressed. The dependent-double observer (DDO) method is an emerging method that both accounts for detection error and is suggested to reduce the occurrence of false positives because it relies on two observers working collaboratively to identify individuals. To date, the DDO method has not been combined with...
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Rest-rotation grazing, defined as lack of livestock grazing in a pasture for 15-18 months, is suggested to improve the quality of sagebrush, shrubland, and grassland habitat for a wide range of species. However, little work has been done to evaluate impacts of rest-rotation grazing on migratory avian species which serve as indicators of sagebrush ecosystem integrity. Evaluating the impacts of rest-rotation grazing using indicator species can provide valuable insight into how rest-rotation grazing may affect multiple species in the ecosystem.Our research is focused on how different grazing systems, rest-rotation and traditional, change songbird community structure (e.g., species abundance and richness). Traditional...
    map background search result map search result map Assessing land use practices on the ecological characteristics of sagebrush ecosystems: multiple migratory bird responses A multispecies dependent double-observer model: A new method to for estimating multispecies abundance Assessing changes in Avian Communities Assessing land use practices on the ecological characteristics of sagebrush ecosystems: multiple migratory bird responses A multispecies dependent double-observer model: A new method to for estimating multispecies abundance Assessing changes in Avian Communities