Jonc du New Jersey
Juncus caesariensisCoville
Pays · région · aire protégée · écorégion · biome
Graphe en cours d’indexation
Calcul du tissu écologique de Juncus caesariensis.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
VU · Vulnérablecritères A2c↘Décroissante- Évaluation
- 2016 · v3.1
- Altitude
- – m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
According to a 2009 review by NatureServe (2014), there are approximately 90 extant occurrences of the species across its range (only fourteen occurrences are believed to have excellent or good viability), with an additional 27 considered historical, and three extirpated. It is a rare species, with only a few occurrences containing more than 1,000 species (all in New Jersey where the species reaches its greatest abundance); many occurrences are small and contain fewer than 25 individuals. Its total global population is estimated to be between 15,000 to 30,000, with a "short-term" and "long-term" population trend likely to be declining by more than 30%, and possibly >50% (NatureServe 2014).
In Canada the population was estimated to be between 5,000 and 10,000 in 2004 (which comprises a significant proportion of the global population), and while the species is believed to have been extirpated from one site, surveys in 2002 found no evidence of a decline since previous surveys in 1992 (COSEWIC 2004, 2015). There are a number of historical records for this species in the United States suggesting that it was more widely spread in the past than it is today (COSEWIC 2004). The species is classed as globally 'Imperiled' by NatureServe (2014), and the populations in the USA and Canada are also classed as nationally 'Imperiled'. The Canadian Endangered Species Conservation Council (CESCC) also class the species as 'Sensitive' (for Canada only).
In Canada the population was estimated to be between 5,000 and 10,000 in 2004 (which comprises a significant proportion of the global population), and while the species is believed to have been extirpated from one site, surveys in 2002 found no evidence of a decline since previous surveys in 1992 (COSEWIC 2004, 2015). There are a number of historical records for this species in the United States suggesting that it was more widely spread in the past than it is today (COSEWIC 2004). The species is classed as globally 'Imperiled' by NatureServe (2014), and the populations in the USA and Canada are also classed as nationally 'Imperiled'. The Canadian Endangered Species Conservation Council (CESCC) also class the species as 'Sensitive' (for Canada only).
Menaces identifiées(7 menaces classées CMP-IUCN)
11_1Habitat shifting & alterationUnknownUnknownOngoing1_1Housing & urban areasUnknownUnknownOngoing2_1_4Scale Unknown/UnrecordedUnknownUnknownOngoing2_2_3Scale Unknown/UnrecordedUnknownUnknownOngoing3_2Mining & quarryingUnknownUnknownOngoing4_1Roads & railroadsUnknownUnknownOngoing7_3Other ecosystem modificationsUnknownUnknownOngoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
The species is highly threatened by land-use conversion and habitat fragmentation, and to a lesser degree by forest management practices, and it is especially vulnerable to sedimentation (Southern Appalachian Species Viability Project 2002 in NatureServe 2014). Potential habitat destruction through disruption of hydrologic regime, residential construction, and road building (NatureServe 2014).
The species is sensitive to changes in its hydrological regime such as drainage or prolonged flooding, making it susceptible to road construction, drainage or infilling (for residential development) and logging, all of which are real plausible threats to the species at least in Canada (COSEWIC 2004). The species and its bog/fen habitat are also threatened in Canada by peat mining, pollution (oil and gas) from boats and cars, climate change and cranberry growing (Environment Canada and Parks Canada Agency 2010).
The species is sensitive to changes in its hydrological regime such as drainage or prolonged flooding, making it susceptible to road construction, drainage or infilling (for residential development) and logging, all of which are real plausible threats to the species at least in Canada (COSEWIC 2004). The species and its bog/fen habitat are also threatened in Canada by peat mining, pollution (oil and gas) from boats and cars, climate change and cranberry growing (Environment Canada and Parks Canada Agency 2010).
Habitats préférentiels (classification IUCN)
5_4Wetlands (inland) - Bogs, Marshes, Swamps, Fens, Peatlands★3_4Shrubland - Temperate5_1Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)5_7Wetlands (inland) - Permanent Freshwater Marshes/Pools (under 8ha)5_9Wetlands (inland) - Freshwater Springs and Oases
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
In New Jersey many occurrences are protected from development, where they occur in Natural or Preservation Areas within State Forests, however, the species appears less well-protected outside New Jersey (NatureServe 2014).
None of the sites in Canada fall within a protected area, 17 sites are on private land and eight on state owned land. The species is is listed under the Nova Scotia Endangered Species Act (Vulnerable) and therefore as a “species at risk” requires a management plan within three years of designation (see Environment Canada and Parks Canada Agency 2010), however, destroying either the plants themselves or their habitat is not illegal (COSEWIC 2004). The species is also listed on the Canadian Species at Risk Act (SARA) on Schedule 1/Annexe 1 Status: SC (2005), by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as Special Concern (2004). More information on the species recent (post 2004) population and habitat trends and status is needed.
None of the sites in Canada fall within a protected area, 17 sites are on private land and eight on state owned land. The species is is listed under the Nova Scotia Endangered Species Act (Vulnerable) and therefore as a “species at risk” requires a management plan within three years of designation (see Environment Canada and Parks Canada Agency 2010), however, destroying either the plants themselves or their habitat is not illegal (COSEWIC 2004). The species is also listed on the Canadian Species at Risk Act (SARA) on Schedule 1/Annexe 1 Status: SC (2005), by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as Special Concern (2004). More information on the species recent (post 2004) population and habitat trends and status is needed.
Actions de conservation (3)Conservation Actions Classification Scheme — IUCNExpert
1_2Resource & habitat protection2_1Site/area management4_3Awareness & communications
Stress écologiques (12)Stresses Classification — IUCNExpert
1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation
Priorités de recherche (6)Research Needed Classification — IUCNExpert
1_1Taxonomy1_2Population size, distribution & trends1_3Life history & ecology1_5Threats3_1Population trends3_4Habitat trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Nearctic
Systèmes (terrestre/eau douce/marin)
TerrestrialFreshwater (=Inland waters)
Formes de croissance
Graminoid
Références bibliographiques (8)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 30 June 2016).
- eMonocot Team. 2015. eMonocot. Available at: <a href="http://e-monocot.org">http://e-monocot.org</a>. (Accessed: December 2015).
- COSEWIC (Committee on the Status of Endangered Wildlife in Canada). 2015. COSEWIC - Wildlife species search. Available at: <a href="http://www.cosewic.gc.ca/eng/sct1/index_e.cfm">http://www.cosewic.gc.ca/eng/sct1/index_e.cfm</a>.
- NatureServe. 2014. NatureServe Explorer: An Online Encyclopedia of Life. Arlington, Virginia. Available at: <a href=" http://explorer.natureserve.org"> http://explorer.natureserve.org</a>. (Accessed: July 18, 2014).
- CFIA and NRCan/CFS. 2011+. Plants of Canada Database. Ottawa Available at: <a href="www.plantsofcanada.info.gc.ca">www.plantsofcanada.info.gc.ca</a>.
- Environment Canada and Parks Canada Agency. 2010. Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada. Species at Risk Act Recovery Strategy Series. Environment Canada and Parks Canada Agency, Ottawa.
- eFloras. 2006. Flora of North America. Vol. 4. Available at: <a href="http://www.efloras.org/flora_page.aspx?flora_id=1">http://www.efloras.org/flora_page.aspx?flora_id=1</a>. (Accessed: 25 October 2016).
- COSEWIC. 2004. COSEWIC assessment and update status report on the New Jersey rush Juncus caesariensis in Canada. Committee on the Status of Endangered Wildlife in Canada, Ottawa.
Évaluateurs & contributeurs (2)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Smith, K.
evaluator
Bilz, M., Kraus, D. & Gould, J.
Smith, K. 2016. Juncus caesariensis. The IUCN Red List of Threatened Species 2016: e.T64315594A67729852. Accessed on 05 May 2026.
Distribution mondiale
Calcul de la distribution GBIF· ~10–60 s
Phénologie
Calcul du calendrier d'apparition· ~5–30 s
Consulter sur les bases externes
Note nomenclaturale & synonymesDétails taxonomiques + synonymes CoLExpert
Note nomenclaturale
TAXREF v18 — INPN/MNHNSynonymes (2)— redirigent vers cette page
- Juncus asperEngelm.
- Verojuncus caesariensis(Coville) Záv.Drábk. & Proćków
Sources : Catalogue of Life Cross-References (synonymes) · TAXREF v18 INPN/MNHN (commentaires FR).