Agave delamateri - W.C. Hodgson & L. Slauson
Tonto Basin Agave
Taxonomic Status: Accepted
Related ITIS Name(s): Agave delamateri W.C. Hodgson & L. Slauson (TSN 564991)
Unique Identifier: ELEMENT_GLOBAL.2.144129
Element Code: PMAGA010W0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Century-Plant Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Liliales Agavaceae Agave
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Concept Reference
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Concept Reference: Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Agave delamateri
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 18May2015
Global Status Last Changed: 16Aug1999
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Agave delamateri is known only from in and around archaeological sites in the Tonto Basin and Verde Valley in the Sonoran Desert in Arizona.  It was cultivated during pre-Columbian times when various traits were selected for by the people managing the crop which lead to divergence from its closest wild ancestor (Parker et al. 2007). Referred to as a 'cultigen' this species is only from approximately 90 clones, does not reproduce sexually and has lower genetic diversity compared to other Agaves.  It is threatened by urban sprawl, creation of reservoirs, recreation activities and a fungus transported by the snout agave weevil.
Nation: United States
National Status: N2

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 (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to a narrow range in central Arizona in the Tonto Basin and the Verde Valley (Parker et al. 2007).

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments: Estimated to occur in approximately 13, 4x4 sq. km. grid cells (NatureServe Element Occurrence data 2015).

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Parker et al. (2007) report 10 populations in their genetics study.  NatureServe and Natural Heritage data report 65 element occurrences as of 2015; presumably more than one element occurrence make up what Parker et al. (2007) refer to as a population.

Population Size Comments: Population size is not a useful metric in the evaluation of this species given that it does not reproduce sexually, but asexually by producing 'offsets' at the base of the parent plants.  90 clones are known (AZGFD 2003).

Overall Threat Impact Comments: The arid conditions of May and June can cause physiological stress. Another threat is the snout agave weevil which spreads a fungus which can damage plants (AZGFD 2003). Other threats include the lack of asexual reproduction and low genetic diversity (Parker et al. 2007) which can be problems in among themselves but also make the species more vulnerable to climate change as it occurs in the desert. Additional threats include urban sprawl, roads, recreation (off road vehicles), expansion of reservoirs, and other recreation activities (AZGFD 2003).

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: Tuzigoot population will probably die off (Arizona ranking form 1/99).

Intrinsic Vulnerability Comments: The only remaining populations of this species are found near pre-Columbian archaeological sites in the Tonto Basin and near Verde Valley in Arizona.  The genetic diversity in this Agave species is low compared with other Agaves and it does not reproduce sexually (Parker et al. 2007). 

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to a narrow range in central Arizona in the Tonto Basin and the Verde Valley (Parker et al. 2007).

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 Gila (04007), Maricopa (04013)*, Yavapai (04025)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 Upper Salt (15060103)+, Tonto (15060105)+, Lower Salt (15060106)+*, Upper Verde (15060202)+, Lower Verde (15060203)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Terrestrial Habitat(s): Desert, Forest/Woodland, Savanna, Shrubland/chaparral, Woodland - Conifer
Habitat Comments: Usually found atop high benches, which are often south- or southwest-facing, or on open hilly slopes, which can be more gentle and are sometimes northeast-facing. Sites often overlook major drainage systems and perennial streams. Soils are gravelly or cobbly, deep, and well-drained; underlying substrate is often conglomerate, sometimes limestone. Plant community is usually Sonoran desert scrub, occasionally Interior Chaparral, Great Basin Conifer (pinyon-juniper) Woodland, or juniper-grassland. Associated species include Carnegiea gigantea, Prosopis sp., Juniperus sp., Gutierrezia sp., Fouquieria¿ splendens, Calliandra eriophylla, Menodora scabra, Echinocereus fasciculatus var. fasciculatus, Echinocereus fasciculatus var. bonkerae, Erodium cicutarium, and occasionally Rhus trilobata, Opuntia engelmannii, Canotia holacantha, Yucca baccata, and Psilostrophe sp. Often found in or near archeological features of the Mogollon, Salado, and Hohokam cultures, including multi-room foundations, and also above check dams and linear alignments. 670 - 1600 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: 18May2015
NatureServe Conservation Status Factors Author: Oliver, L.

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
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  • Arizona Game and Fish Department. 2003. Agave delamateri. Unpublished abstract compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, AZ. 6 pp.

  • Arizona Rare Plant Committee. circa 2001. Arizona rare plant field guide: A collaboration of agencies and organizations. Arizona Rare Plant Committee, Phoenix.

  • Flora of North America Editorial Committee. 2002a. Flora of North America North of Mexico. Vol. 26. Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York. xxvi + 723 pp.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Parker, K. C., J. L. Hamrick, W. C. Hodgson, D. W. Trapnell, A. J. Parker, and R. K. Kuzoff. 2007a. Genetic consequences of pre-Columbian cultivation fo Agave murpheyi and A. delamateri (Agavaceae). American Journal of Botany 94(9): 1479-1490.

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

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