Mammillaria berkiana

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
PLANTAE	TRACHEOPHYTA	MAGNOLIOPSIDA	CARYOPHYLLALES	CACTACEAE

Scientific Name:

Mammillaria berkiana

Species Authority:

Lau

Common Name/s:

Spanish

–

Biznaguita

Taxonomic Notes:

Taxonomic Reliability: Considered synonymous with M. mercadensis by cactus specialist Anderson (2001) and by the assessors. It is accepted as a species by cactus specialists Hunt (1999), provisionally, and Pilbeam (1999). The assessors have demonstrated that M. berkiana has no known characteristics that differentiate it from the surrounding M. jaliscana/M. mercadensis apart from the intensity of the flower color.

Assessment Information [top]

Red List Category & Criteria:	Critically Endangered A2a; B1ab(v); C2a(ii) ver 3.1
Year Assessed:	2002
Assessor/s:	Fitz Maurice, W.A. & Fitz Maurice, B.
Reviewer/s:	Stuppy, W. & Taylor, N.P. (Cacti & Succulent Plant Red List Authority)
Justification: Qualifies due to its two known areas of occupancy, considered here to be a single location, where it was decimated by the Dec. 1997 freeze on Mexico’s Altiplano. At the time of the assessors’ first visit to the type locality with Lau in 1994, the population was estimated to be in excess of 5,000 plants. In 1999 the population was estimated to be less than 100 plants. This species is regarded by some to be synonymous with M. jaliscana and/or M. mercadensis.

Geographic Range [top]

Range Description:	Occurs north of San Andreas from two sites about 3 km apart, probably best considered a single location. The estimated total range is 25 km². It is estimated that the total area of occupancy of the two subpopulations is less than 1 km², and with a total population estimated to be less than 100 individuals.
Countries:	Native: Mexico (Jalisco)

Population [top]

Population Trend:	Unknown

Population Trend:

Unknown

Habitat and Ecology [top]

Habitat and Ecology:	Sloping volcanic rocky terrain in semi-desert at about 1,600 m altitude.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	Currently little threatened by collectors. Although the habitat is known to collectors, the trip to the type locality from and back to the nearest rudimentary facilities takes a full day thus discouraging tour groups and casual collectors. Natural disasters seem to be the main cause for concern.

Major Threat(s):

Currently little threatened by collectors. Although the habitat is known to collectors, the trip to the type locality from and back to the nearest rudimentary facilities takes a full day thus discouraging tour groups and casual collectors. Natural disasters seem to be the main cause for concern.

Conservation Actions [top]

Conservation Actions:	Listed on CITES App. II, but need to enforce the laws in the countries of destination.

Conservation Actions:

Listed on CITES App. II, but need to enforce the laws in the countries of destination.

Citation:	Fitz Maurice, W.A. & Fitz Maurice, B. 2002. Mammillaria berkiana. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 10 February 2012.
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