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Hydrogen stable isotope data for: 'Mechanisms associated with an advance in the timing of seasonal reproduction in an urban songbird'.


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Stricker, C.A., 2017, Hydrogen stable isotope data for 'Mechanisms associated with an advance in the timing of seasonal reproduction in an urban songbird': U.S. Geological Survey data release,


This dataset includes stable hydrogen isotope values of the nonexchangeable hydrogen contained in the outer most secondary feathers of dark-eyed juncos (Junco hyemalis thurberi) collected from the University of California San Diego campus in La Jolla, California in 2014. Hydrogen isotope values in feathers have become a powerful tool for inferring the breeding grounds of a wide variety of avian species. In most of these migratory species, feathers are molted prior to departing the breeding grounds for more overwintering regions to the south. These data were used in tandem with morphological and genetic data for the classification of resident and migrant birds. There are two files in this dataset: 1) A tab delimitated machine readable [...]


Point of Contact :
Craig A Stricker
Process Contact :
Craig A Stricker
Originator :
Craig A Stricker
Metadata Contact :
Craig A Stricker
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
SDC Data Owner :
Fort Collins Science Center

Attached Files

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junco_dH2_timing of reproduction following urbanization.csv 5.01 KB
junco_dH2_timing of reproduction following urbanization_data_dictionary.csv 821 Bytes
junco_dH2_timing of reproduction following urbanization.csv.xml
Original FGDC Metadata

13.08 KB


Urban, sedentary bird populations are known to breed earlier than related migratory populations, but the cues that alter reproductive phenology are not well known. The hypothalamic-pituitary-gonadal (HPG) axis plays an important role in the seasonal regulation of reproduction in birds. This study contrasted populations of resident and migratory dark-eyed juncos that are sympatric during the breeding season to determine whether differences in the timing of reproduction result from differential activation of the HPG in early spring and whether this is linked to sensitivity in day length. Two experiments were conducted to meet this goal, one using free-living juncos on the shared overwintering grounds, and a second using juncos held in a captive common-garden.



  • Fort Collins Science Center (FORT)
  • USGS Data Release Products



Additional Information


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DOI doi:10.5066/F78P5Z1X

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