Mammillaria thornberi - Orcutt
Thornber's Fishhook Cactus
Taxonomic Status: Accepted
Related ITIS Name(s): Mammillaria thornberi Orcutt (TSN 19789)
Unique Identifier: ELEMENT_GLOBAL.2.128379
Element Code: PDCAC0A0C0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Cactus Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Caryophyllales Cactaceae Mammillaria
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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: Mammillaria thornberi
Conservation Status
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NatureServe Status

Global Status: G4
Global Status Last Reviewed: 13May1999
Global Status Last Changed: 24Jan1991
Rounded Global Status: G4 - Apparently Secure
Reasons: Small population size, about 600 plants in 2 population areas. Limited distribution increases the species vulner- ability to natural and man-made stresses.
Nation: United States
National Status: N4

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 (S4)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Avra Valley/Saguaro National Monument and on the Papago Indian Reservation, Pima and Pinal Cos., Arizona. Possibly in northern Sonora, Mexico.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: 2 major population areas.

Population Size Comments: Appox. 600 plants: Saguaro Natl. Monument- 73 and Avra Val- ley- 332, Papago Indian Reservation- 195 at 24 locations.

Overall Threat Impact Comments: Habitat loss to urbanization, agriculture and utility pro- jects; collectors; grazing; pumping of ground water.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Avra Valley/Saguaro National Monument and on the Papago Indian Reservation, Pima and Pinal Cos., Arizona. Possibly in northern Sonora, Mexico.

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

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AZ Pima (04019), Pinal (04021)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 Rillito (15050302)+, Lower Santa Cruz (15050303)+*, Brawley Wash (15050304)+, Santa Rosa Wash (15050306)+, Rio Sonoyta (15080102)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Reproduction Comments: Mammillaria is dispersed by a wide array of vertebrate animals (van Rheede van Ousdtshorn and van Rooyen 1999). Serotiny, or delayed seed dispersal, is documented in Mammillaria as a bet-hedging strategy that is used when environmental conditions are favorable. Seeds are intially retained and then dispersed when precipitation is adequate for seed germination (Peters et al. 2009).

Ecology Comments: This species inhabits remote desert habitats where it is known to associate with nurse plants to exploite favorable microhabitat conditions.
Habitat Comments: It grows in deep, gravelly, arid soils on flood plains, alluvial fans and deeply dissected uplands, 240-720 m.
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: 17Jun1987
NatureServe Conservation Status Factors Author: Roth, E.

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

  • 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.

  • Peters, E. M., C. Martorell, and E. Ezcurra. 2009. The adaptive value of cued seed dispersal in desert plants: seed retention and release in Mammillaria pectinifera (Cactaceae), a small globose cactus. American Journal of Botany 96(2): 537-541.

  • Suzan, H., G.P. Nabhan, and T. P. Duncan. 1996b. The importance of Olneya tesota as a nurse plant in the Sonoran Desert. Journal of Vegetation Science 7(5): 635-644.

  • Valiente-Banuet, A., and H. Godinez-Alvarez. 2002. Population and Community Ecology. Pages 91-108. in: P. Nobel, editor. Cacti: Biology and Uses. University of California Press, Berkeley, CA.

  • van Rheede van Ousdtshoorn, K., and M. W. van Rooyen. 1999. Dispersal biology of desert plants. Berlin, Germany. Springer-Verlag. 242 pp.

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Citation for Bird Range Maps of North America:
Ridgely, R.S., T.F. Allnutt, T. Brooks, D.K. McNicol, D.W. Mehlman, B.E. Young, and J.R. Zook. 2003. Digital Distribution Maps of the Birds of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

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Patterson, B.D., G. Ceballos, W. Sechrest, M.F. Tognelli, T. Brooks, L. Luna, P. Ortega, I. Salazar, and B.E. Young. 2003. Digital Distribution Maps of the Mammals of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

Acknowledgement Statement for Mammal Range Maps of North America:
"Data provided by NatureServe in collaboration with Bruce Patterson, Wes Sechrest, Marcelo Tognelli, Gerardo Ceballos, The Nature Conservancy-Migratory Bird Program, Conservation International-CABS, World Wildlife Fund-US, and Environment Canada-WILDSPACE."

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