CO State University - Natural Resource Ecology Lab - CO River Basin - Tamarix - 2014 and 2017

Latest version published by United States Geological Survey on Jan 4, 2023 United States Geological Survey
Publication date:
4 January 2023
CC0 1.0

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Data as a DwC-A file download 1,575 records in English (59 KB) - Update frequency: not planned
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Tamarisk occurrence records in the Colorado River Basin.

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 1,575 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Evangelista, Paul, Young, Nicholas, Vorster, Tony, West, Amanda, Hatcher, Emma, Woodward, Brian, Anderson, Ryan, Girma, Rebecca, and Colorado State University. Natural Resource Ecology Laboratory. Mapping Native and Non-native Riparian Vegetation in the Colorado River Watershed (2018): Riparian Habitat and Invasive Species in the Colorado River Basin – Data Collection.


Researchers should respect the following rights statement:

The publisher and rights holder of this work is United States Geological Survey. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 9af34855-acaf-4d5e-8953-fb5912d09fd9.  United States Geological Survey publishes this resource, and is itself registered in GBIF as a data publisher endorsed by U.S. Geological Survey.


Metadata; Colorado River Basin; Tamarix; Metadata


Paul Evangelista
  • Metadata Provider
  • Originator
  • Point Of Contact
Research scientist
Natural Resource Ecology Laboratory
1499 Campus Delivery
80524-1499 Fort Collins
Catherine Jarnevich
  • Distributor
United States Geological Survey
2150 Centre Avenue Bldg C
80526 Fort Collins
Annie Simpson
  • Publisher
biologist and information scientist
U.S. Geological Survey
12201 Sunrise Valley Dr, MS 302
20192 Reston
+1 703 648 4281

Geographic Coverage

Select U.S. tributaries to the Colorado Rivier.

Bounding Coordinates South West [31.905, -114.725], North East [39.251, -108.238]

Taxonomic Coverage

No Description available

Genus Tamarix (salt cedar)

Temporal Coverage

Start Date / End Date 2014-01-01 / 2017-12-31

Project Data

Occurrences of the genus Tamarix along some tributaries of the Colorado River Basin, in 2014 and 2017.

Title Tamarisk Occurrences in Select Tributaries of theColorado River Basin
Funding This project was funded by the Walton Family Foundation. Walton Family Foundation P.O. Box 2030 Bentonville, AR 72712 Phone: 479-464-1570 Fax: 479-464-1580
Study Area Description The study area encompasses the US portion of the Colorado River Basin. Data for this area were collected during fall 2014 and summer 2017.
Design Description [blank]

The personnel involved in the project:

Paul Evangelista
  • Principal Investigator

Sampling Methods

The 2014 data were collected from generated points using stratified random sampling with locations placed a minimum distance of 30 meters between them. A 7.32 meters radius circular plot was established at each of these locations where all vegetation was identified and the percent cover of each species was cataloged. The 2017 data were collected using high-resolution imagery on a digital collection interface along the Animas, Colorado, Dolores, Escalante, Fremont, Gila, Paria, San Juan, San Miguel, San Pedro, San Rafael, Verde, Virgin, Little Colorado, and Santa Clara Rivers and McElmo Creek. Most of the sampling was done from vehicles, so determination of dominance was based on ocular estimates from a distance. Dominance of data collected was defined as occupying greater than 50% of the canopy within a roughly 7 m radius circle. This plot size was selected based on its use across a broad range of agencies, and its utility in training models fit with remotely sensed imagery.

Study Extent Data were restricted to the Colorado River Basin extent. Data were collected in select tributaries of the Colorado River located in Arizona, California, Colorado, Nevada, New Mexico, and Utah. They were collected during fall 2014 and summer 2017.
Quality Control To eliminate some errors/bias from spatial autocorrelation, points were generated within a 30 meters (one Landsat pixel) minimum distance from each other. All vegetation types were identified and percent cover of each type was recorded in detail within each plot.

Method step description:

  1. [step description text]

Additional Metadata

This work is licensed under a Creative Commons CCZero 1.0 License