Macrozamia johnsonii 


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.
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
Previously published Red List assessments:
2003 Least Concern (LC)
1998 Rare (R)

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 occurrence:
Australia (New South Wales)
Estimated area of occupancy (AOO) - km2: 100
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.
Current Population Trend: Stable
Additional data:
Population severely fragmented: No

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
Generation Length (years): 60

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 2010: e.T42008A10620094. . Downloaded on 30 November 2015.
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