Macrozamia johnsonii
D.L.Jones & K.D.Hill
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Pays · région · aire protégée · écorégion · biome
Graphe en cours d’indexation
Calcul du tissu écologique de Macrozamia johnsonii.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
VU · Vulnérablecritères B1ab(iii,v)+2ab(iii,v)↘Décroissante- Évaluation
- 2022 · v3.1
- Altitude
- 575 – 625 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
Bins and Meek (2008) sampled plots throughout the range of Macrozamia johnsonii. Based on these data, the population was estimated to be ca. 3.5 million mature plants.
The Scientific Committee, established by the Threatened Species Conservation Act in Australia noted that approximately 59% of the total population of Macrozamia johnsonii is thought to occur in State Forest, 30% in National Park, and 11% on private land (Binns and Meek 2008). Of the population present in State Forests 44% is estimated to be contained within logging exclusion zones (E. Robinson in litt. Jan 2011), resulting in an estimated 33% of the total population of M. johnsonii being potentially harvestable from State Forests and 11% from private land. Due to physical and economic constraints the actual area harvested is usually less than the potential harvest area, with modelling of previous forestry activity predicting that between 21% and 32% of M. johnsonii habitat in State Forests will be logged in the next 100 years (E. Robinson in litt. Jan 2011). The overall estimates for decline across the entire population ranged between 5% and 13%.
The Scientific Committee, established by the Threatened Species Conservation Act in Australia noted that approximately 59% of the total population of Macrozamia johnsonii is thought to occur in State Forest, 30% in National Park, and 11% on private land (Binns and Meek 2008). Of the population present in State Forests 44% is estimated to be contained within logging exclusion zones (E. Robinson in litt. Jan 2011), resulting in an estimated 33% of the total population of M. johnsonii being potentially harvestable from State Forests and 11% from private land. Due to physical and economic constraints the actual area harvested is usually less than the potential harvest area, with modelling of previous forestry activity predicting that between 21% and 32% of M. johnsonii habitat in State Forests will be logged in the next 100 years (E. Robinson in litt. Jan 2011). The overall estimates for decline across the entire population ranged between 5% and 13%.
Menaces identifiées(1 menace classée CMP-IUCN)
5_3_3Unintentional effects: (subsistence/small scale) [harvest]Negligible declinesMinority (<50%)Ongoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
The only real threat at present appears to be timber harvesting.
Habitats préférentiels (classification IUCN)
1_5Forest - Subtropical/Tropical Dry1_6Forest - Subtropical/Tropical Moist Lowland2_1Savanna - Dry
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
This species is listed in Appendix II of CITES. Up to 59% of the area where Macrozamia johnsonii occurs falls within state forest where timber harvest (the main threat) is not allowed. Subpopulations are also found in the Chaelundi National Park. An education and awareness programme as well as the long-term monitoring of populations will support the conservation of this species.
Actions de conservation (1)Conservation Actions Classification Scheme — IUCNExpert
4_3Awareness & communications
Stress écologiques (1)Stresses Classification — IUCNExpert
1_2Ecosystem degradation
Usage & commerce (1)Use & Trade — IUCNExpert
13Pets/display animals, horticultureinternationalnational
Priorités de recherche (1)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Australasian
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
CycadTree - small
Références bibliographiques (10)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2023. The IUCN Red List of Threatened Species. Version 2023-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 07 December 2023).
- IUCN. 2022. The IUCN Red List of Threatened Species. Version 2022-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 21 July 2022).
- Binns, D.L. and Meek, P. 2008. Population size, habitat and conservation status of an Endangered species, <i>Macrozamia johnsonii</i> (Zamiaceae). <i>Cunninghamia</i> 10: 373-380.
- Osborne, R., Randall, L. and Chemnick, J. 2006. Focus on <i>Macrozamia johnsonii</i>. <i>Encephalartos</i> 85: 9-14.
- Donaldson, J.S. (ed.). 2003. <i>Cycads. Status Survey and Conservation Action Plan</i>. IUCN/SSC Cycad Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.
- Whitelock, L.M. 2002. <i>The Cycads</i>. Timber Press, Portland, Oregon.
- Hill, K. and Osborne, R. 2001. <i>Cycads of Australia</i>.
- Hill, K.D. and Stevenson, D.W. 1998-2006. The Cycad Pages. Available at: <a href="http://plantnet.rbgsyd.gov.au/PlantNet/cycad/">http://plantnet.rbgsyd.gov.au/PlantNet/cycad/</a>.
- Jones, D.L. 1993. <i>Cycads of the World</i>. Reed, New Holland, Frenchs Forest, N.S.W., Australia.
- Jones, D.L. and Hill, K.D. 1992. <i>Macrozamia johnsonii</i>, a new species of <i>Macrozamia</i> section <i>Macrozamia</i> (Zamiaceae) from northern New South Wales. <i>Telopea</i> 5(1): 31-34.
Évaluateurs & contributeurs (3)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Bösenberg, J.D.
contributor
Binns, B.L. & Meek, P.
evaluator
Donaldson, J.S.
⚠ 1 erratum publié après l'évaluation.
Bösenberg, J.D. 2022. Macrozamia johnsonii (errata version published in 2023). The IUCN Red List of Threatened Species 2022: e.T42008A243391551. Accessed on 05 May 2026.
Distribution mondiale
Calcul de la distribution GBIF· ~10–60 s
Phénologie
Calcul du calendrier d'apparition· ~5–30 s
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Observations & statuts
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