Ruth, J.M., 2017, Life history attributes data for Arizona Grasshopper Sparrow (Ammodramus savannarum ammolegus) in Arizona 2013: U.S. Geological Survey data release, https://doi.org/10.5066/F7C53JCF.
Summary
Ammodramus savannarum ammolegus (commonly referred to as the Arizona Grasshopper Sparrow) occurs in the desert and plains grasslands of southeastern Arizona, southwestern New Mexico, and northern Sonora, Mexico. Although a subspecies of conservation concern, this data was produced as part of the first intensive study of its life history and breeding ecology, providing baseline data and facilitating comparisons with other North American Grasshopper Sparrow subspecies. This study is described in the publication listed in the larger work citation of this metadata record. In 2011 through 2013, I took nest measurements within a week of nest failure or fledgling. However, in 2011, the first year of nest monitoring, I measured 17 nests more [...]
Summary
Ammodramus savannarum ammolegus (commonly referred to as the Arizona Grasshopper Sparrow) occurs in the desert and plains grasslands of southeastern Arizona, southwestern New Mexico, and northern Sonora, Mexico. Although a subspecies of conservation concern, this data was produced as part of the first intensive study of its life history and breeding ecology, providing baseline data and facilitating comparisons with other North American Grasshopper Sparrow subspecies. This study is described in the publication listed in the larger work citation of this metadata record. In 2011 through 2013, I took nest measurements within a week of nest failure or fledgling. However, in 2011, the first year of nest monitoring, I measured 17 nests more than 7 days after nest completion. Measurements included: nest opening, inside diameter, inside depth, nest height, orientation of nest opening, length of tunnel, and nest concealment.
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ARCHIVE AZ GRSP Nest Dimensions.csv.xml Original FGDC Metadata
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ARCHIVE AZ GRSP Nest Dimensions.csv
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Purpose
The primary objective of this study was to provide baseline data that would address the information gap for this subspecies of conservation concern. Specifically, I estimated basic life history attributes of ammolegus including male mass and morphometric measurements, territory size, and return rates, as well as nest placement and orientation, nest and egg dimensions, clutch size, and nest parasitism rates. The secondary objective of this study was to compare ammolegus morphometric and mass estimates with available data for other Grasshopper Sparrow subspecies.
