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Mammillaria hernandezii 

Scope:Global
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Caryophyllales Cactaceae

Scientific Name: Mammillaria hernandezii
Species Authority: Glass & R.A.Foster
Taxonomic Source(s): Hunt, D., Taylor, N. and Charles, G. (compilers and editors). 2006. The New Cactus Lexicon. dh Books, Milborne Port, UK.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii,v) ver 3.1
Year Published: 2013
Date Assessed: 2009-05-01
Assessor(s): Arias, S. & Martorell, C.
Reviewer(s): Chanson, J.S. & Goettsch, B.K.
Facilitator/Compiler(s): Goettsch, B.K.
Justification:
This species has a restricted extent of occurrence (less than 5,000 km²), its range is severely fragmented and there is a continuing decline in the quality of the habitat and numbers of mature individuals due to the impacts of grazing by goats. Hence, it is listed as Endangered.

Geographic Range [top]

Range Description:This species is a Mexican micro endemic known to occur only in a small area in the Sierra Mixteca in the state of Oaxaca at elevations of ca 2,300 m asl (Pilbeam 1999). It occurs in five isolated sites (Rodríguez-Ortega et al. 2006; S. Arias pers. comm. 2009).
Countries occurrence:
Native:
Mexico (Oaxaca)
Additional data:
Upper elevation limit (metres):2300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species can be very abundant, some subpopulations can have tens of thousands of individuals and more subpopulations continue to be discovered (C. Martorel pers. comm. 2009). Studies from two of the sites of M. hernandezii report a total of 43 reproductive individuals (Rodríguez-Ortega et al. 2006).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:250-499Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:The species grows in open spaces in oak-pine woodland (Arias et al. 1997, Rodríguez-Ortega et al. 2006). It flowers between October and December (Arias et al. 1997). It grows barely above ground, so may be overlooked.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: It is not commonly grown, but is in specialist collections.

Threats [top]

Major Threat(s): The major threat is the change of microhabitats as a result of goat overgrazing which makes it difficult for the establishment of seedlings (Jiménez-Sierra et al. 2007, Ureta 2006 in Jiménez-Sierra et al. 2007).

Conservation Actions [top]

Conservation Actions:

The species is legally protected in Mexico by the national list of species at risk of extinction, NOM-059-SEMARNAT-2010, where it is listed under the category “subject to special protection” (Pr; SEMARNAT 2010). All of the localities occur within the Tehuacán-Cuicatlán Biosphere Reserve (Rodríguez-Ortega et al. 2006). It has been reported that complete exclusion of goats did not help the growth of its populations in a study of a few years, given that over grazing by goats alters the microhabitats and seed establishment is difficult (Ureta 2006 in Jiménez-Sierra et al. 2007, Jiménez-Sierra et al. 2007).


Citation: Arias, S. & Martorell, C. 2013. Mammillaria hernandezii. The IUCN Red List of Threatened Species 2013: e.T152282A618523. . Downloaded on 24 July 2016.
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