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Macrozamia johnsonii

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA CYCADOPSIDA CYCADALES ZAMIACEAE

Scientific Name: Macrozamia johnsonii
Species Authority: D.L.Jones & K.D.Hill

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Bins, B.L. & Meek, P.
Reviewer(s): Donaldson, J.S. & Boösenberg, J.D.
Justification:
Although confined to a relatively small area (220 km²), populations appear to be large and relatively stable and not under immediate threat, it is therefore listed as Least Concern.

The listing is consistent with a decision from the New South Wales Scientific Committee to remove this species from the Threatened Species Conservation Act in April 2010 (see http://www.environment.nsw.gov.au/determinations/macrozamiajohnsoniiPD.htm).
History:
2003 Least Concern (IUCN 2003)
2003 Least Concern
1997 Rare (Walter and Gillett 1998)

Geographic Range [top]

Range Description: This species occurs in the vicinity of Dalmorton on the ranges inland from Grafton on the north coast of New South Wales, Australia. According to Binns and Meek (2008), the minimum convex polygon enclosing all records (extent of occurrence) covers 22,200 ha. On the basis of the number of plots occupied within this area, the area of occupancy is estimated to be 10,100 ha (Bins and Meek 2008).
Countries:
Native:
Australia (New South Wales)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Bins and Meek (2008) sampled plots throughout the range of M. johnsonii. Based on these data, the population was estimated to be ca. 3.5 million mature plants.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: The area in which M. johnsonii occurs comprises an intergrading mosaic of grassy open eucalypt forest and shrubby wet sclerophyll forest, with patches of rainforest in the most sheltered sites (Binns and Meek 2008). Common canopy dominants include Corymbia variegata, Eucalyptus microcorys, Eucalyptus biturbinata, Eucalyptus carnea, Eucalyptus siderophloia and Lophostemon confertus.

Based on a GLM model, Binns and Meek (2008) concluded that the factors that most strongly influenced the occurrence of M. johnsonii were moisture index and slope. Plants are much more likely to be found on sites with high moisture index and steep slopes.
Systems: Terrestrial

Threats [top]

Major Threat(s): The only real threat at present appears to be timber harvesting. However, the timber harvesting only affects a small proportion of the area in which M. johnsonii occurs.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of CITES. Up to 59% of the area where M. johnsonii occurs falls within state forest where timber harvest (the main threat) is not allowed.

Citation: Bins, B.L. & Meek, P. 2010. Macrozamia johnsonii. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 22 September 2014.
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