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Code and data files to construct an Integral Projection Model for Giant Gartersnakes (Thamnophis gigas) in the Sacramento Valley, California, 1995-2017


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Rose, J.P., and Halstead, B.J., 2020, Code and data files to construct an Integral Projection Model for Giant Gartersnakes (Thamnophis gigas) in the Sacramento Valley, California, 1995-2017: U.S. Geological Survey data release,


This dataset includes data on the growth, fecundity, and survival of Giant Gartersnakes (Thamnophis gigas) in the Sacramento Valley of California from 1995-2017. In addition, the dataset includes R code to replicate the Integral Projection Model construction and analysis presented in the paper "Demographic drivers of population growth in a threatened snake" by Rose et al. published in Journal of Wildlife Management in 2019. These data support the following publication: Rose, J.P., Ersan, J.S., Wylie, G.D., Casazza, M.L. and Halstead, B.J., 2019. Demographic factors affecting population growth in giant gartersnakes. The Journal of Wildlife Management, 83(7), pp.1540-1551.

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Point of Contact :
Jonathan P Rose
Originator :
Jonathan P Rose, Brian J Halstead
Metadata Contact :
Jonathan P Rose
USGS Mission Area :
SDC Data Owner :
Western Ecological Research Center
Distributor :
U.S. Geological Survey - ScienceBase

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These data were collected to better understand the demography of Giant Gartersnakes in the Sacramento Valley. The Integral Projection Model was constructed to identify which life-stage transitions (e.g., survival, fecundity) have the greatest influence of the growth rate of Giant Gartersnake populations.


The authors of these data require that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.


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ScienceBase WMS


  • USGS Data Release Products
  • USGS Western Ecological Research Center



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Input directly

Additional Information


Type Scheme Key
DOI doi:10.5066/P9IBSR18

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