Pediocactus bradyi - L. Benson
Brady's Pincushion Cactus
Other Common Names: Brady's pincushion cactus
Taxonomic Status: Accepted
Related ITIS Name(s): Pediocactus bradyi L. Benson (TSN 19770)
Unique Identifier: ELEMENT_GLOBAL.2.128223
Element Code: PDCAC0E010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Cactus Family
Image 21760

Public Domain

 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Caryophyllales Cactaceae Pediocactus
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Pediocactus bradyi
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 06Apr2015
Global Status Last Changed: 01Jan1996
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G1 - Critically Imperiled
Reasons: Restricted to a specific and limited limestone soil type and known only from the Marble Gorge area of northern Arizona. Threats include off-road vehicle traffic, livestock grazing, highway construction and maintenance, illegal collection, climate change, rodent depredation, and invasive exotic plant species.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Arizona (S1), Navajo Nation (S1)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (26Oct1979)
U.S. Fish & Wildlife Service Lead Region: R2 - Southwest

NatureServe Global Conservation Status Factors

Range Extent Comments: Coconino County, in northern Arizona, along Marble Canyon. The species' range comprises an area approximately 23 kilometers (km) in length, north to south, and varies in width from 1.6 km to 4.58 km (USFWS 2012).

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 1 - 20
Number of Occurrences Comments: Scattered populations throughout its limited range. There are approximately 8 extant occurrences in Arizona (EO data in the NatureServe central database as of August 2013).

Population Size Comments: There are less than 2500 individuals (Butterworth and Porter 2013). "Navajo Nation populations are typically found in small widely scattered groups of 2 to 15 cacti. In 2004, only one population contained over 100 plants" (Roth 2004).

Overall Threat Impact: Very high - high
Overall Threat Impact Comments: Threatened by off-road vehicles, livestock grazing, and highway construction and maintenance (USFWS 2012; Butterworth and Porter 2013). The threat of illegal collection has been greatly reduced (USFWS 2012). Additional threats that are becoming more apparent include climate change, rodent depredation, and invasive exotic plant species (USFWS 2012). Other potential threats include pesticides and mining.

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: "Over the past 24 years of monitoring, the BLM population has shown resilience and the potential to rebound after a significant decrease in population size from environmental or natural factors. However, the last five years document a decline in the population that is likely attributed to a continuation of lower than average annual precipitation and snowfall rates, and increased temperatures that began in the late 1990s. If these environmental trends continue, recruitment is likely to decrease, ultimately driving the population towards a downward trend that may not be recoverable" (USFWS 2012). According to Laurenzi and Spence (2012), the trend is decreasing.

Intrinsic Vulnerability Comments: "Long-lived and exhibits relatively low fecundity, which would increase the potential for a genetic bottleneck in conjunction with its isolated and restricted distribution, and limited micro-habitat" (USFWS 2012).

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Restricted to a unique and very localized soil type, subject to root rot.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Coconino County, in northern Arizona, along Marble Canyon. The species' range comprises an area approximately 23 kilometers (km) in length, north to south, and varies in width from 1.6 km to 4.58 km (USFWS 2012).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AZ, NN

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AZ Coconino (04005)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
14 Lower Lake Powell (14070006)+*, Paria (14070007)+*
15 Lower Colorado-Marble Canyon (15010001)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: An inconspicuous, spiny succulent with a (usually solitary) rounded stem, 3.8-6.2 cm tall. The plants often retract into the ground during the dry season. A pale yellow flower blooms on top of the stem in April.
Duration: PERENNIAL, Long-lived
Reproduction Comments: Members of Pediocactus produce dry, dull-colored fruit which are presumed not to be dispersed by birds or rodents, but rather wind or water. Little variation exists within populations. These populations can be separated by distances of several miles even when there is suitable habitat. Further, dispersal within populations appears to be staggered throughout the growing season from shortly after seeds are produced in June to fall. This dispersal strategy may be disadvantageous for the species, however, populations in the genus when left undisturbed seem to be healthy with all age classes represented (Heil et al. 1981).
Terrestrial Habitat(s): Desert, Shrubland/chaparral
Habitat Comments: Navajoan Desert on benches and terraces made up of Kaibab limestone chips overlying Moenkopi shale and sandstone-derived soils. 1170-1370 m elevation. Associated plants include shadscale (Atriplex confertifolia), snakeweed (Gutierrezia sarothrae), and Mormon tea (Ephedra viridis).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 16Sep2013
NatureServe Conservation Status Factors Author: Roth, E., rev. Maybury (1996), rev. S. Schuetze (2012), rev. A. Tomaino (2013). rev. A. Treher (2015)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Arizona Game and Fish Department. 2001. Pediocactus bradyi. Unpublished abstract compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, AZ. 6 pp. [http://www.azgfd.gov/w_c/edits/documents/Pedibrad.fo_000.pdf]

  • Arizona Rare Plant Committee. 2001. Arizona rare plant field guide: a collaboration of agencies and organizations. U.S. Government Printing Office, Washington. Online. Available: http://www.aznps.com/rareplants.php (Accessed 2013).

  • Benson, L. 1982. The Cacti of the United States and Canada. Stanford University Press, Stanford, California. 1044 pp.

  • Butterworth, C., and J.M. Porter. 2013. Pediocactus bradyi. IUCN Red List of Threatened Species. Version 2013.1. Online. Available: http://www.iucnredlist.org (accessed 11 July 2013).

  • Flora of North America Editorial Committee. 2003b. Flora of North America North of Mexico. Vol. 4, Magnoliophyta: Caryophyllidae, part 1. Oxford University Press, New York. 559 pp.

  • Heil, K., B. Armstrong and D. Schleser. 1981. A review of the genus Pediocactus. Cactus and Succulent Journal 53:17-39.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Laurenzi, A. and J.R. Spence. 2012. Conservation priority setting for Arizona G1 and G2 plant species: A regional assessment.

  • Roth, D. 2004. Pediocactus bradyi status report. Unpublished report prepared for the U.S. Fish and Wildlife Service, Tucson, Arizona. Navajo Natural Heritage Program, Window Rock, Arizona. [http://nnhp.nndfw.org/docs_reps/pebr_rpt.pdf]

  • Roth, D. 2008. Monitoring report. Pediocactus bradyi, Marble Canyon, Coconino County, AZ. Unpublished annual update prepared for the Navajo Natural Heritage Program, Window Rock, Arizona. [http://nnhp.nndfw.org/docs_reps/monitor_pebr_marble08.pdf]

  • Rutman, S. 1992. Handbook of Arizona's endangered, threatened, and candidate plants. U.S. Fish and Wildlife Service. Phoenix, AZ. 30 pp.

  • U.S. Fish and Wildlife Service. 2012. Brady Pincushion Cactus (Pediocactus bradyi). 5-year review: summary and evaluation. Arizona Ecological Services Office, U.S. Fish and Wildlife Service, Phoenix, AZ.

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