Scientific Name: Eleocharis tuberculosa
Taxonomy Group: Vascular Plants
Range: Nova Scotia
Last COSEWIC Assessment: April 2010
Last COSEWIC Designation: Special Concern
SARA Status: Schedule 1, Special Concern
Image of Tubercled Spike-rush
The Tubercled Spike-rush is a grass-like plant with stiffly erect, flattened stems and much-reduced leaves. It grows from 10 to 40 cm high. The individual flowers are tiny and inconspicuous but they are clustered into a distinct oval spike at the top of the stem. The plant is stiff and grows in dense clumps, which helps to distinguish it from other species of Spike-rush.
Distribution and Population
This Atlantic Coastal Plain species ranges from Nova Scotia southward along the Atlantic seaboard as far as Florida, and west along the coast of the Gulf of Mexico to Texas. The Canadian population is widely separated from the closest American population and is probably genetically distinct from the US populations. In Canada, the species is known to occur at only five lakes in southwestern Nova Scotia. The total known area occupied by this species in Nova Scotia is approximately 200 to 300 square meters. An estimated 3000 to 4000 clumps have been documented with 60 to 70% of them occurring on a single lake. Evidence suggests that the population size fluctuates dramatically on a yearly basis and the species' presence or absence at sites also tends to vary from year to year. Long-term population trends are unknown.
The Tubercled Spike-rush occurs in a portion of Nova Scotia that tends to have a hot, dry growing season. It grows on sandy or stony lake shores, gravel bars and on the fringes of peat layers or mats that are either floating or have been washed up or pushed up by ice onto shorelines. It is also found on the edges of peaty wetlands bordering lakes.
Little is known about the biology of this species. Listed by some sources as an annual, the Tubercled Spike-rush is also listed as a perennial. It can reproduce vegetatively and form clumps. The Nova Scotia populations flower in August, and the plants are pollinated by wind. The seeds mature in September and October and are dispersed by wind or water.
In Canada, the Tubercled Spike-rush occurs in a very restricted area at the northern edge of its range and is presumably limited by climatic conditions and the availability of suitable habitat. It occurs in areas where there is limited or no competition from other plant species. Its habitat is affected by adverse environmental factors, such as severe storms, flooding, and ice-scouring (pushing of ice against shoreline), and by inadvertent destruction of lake shoreline by the recreational activities of local residents (use of all-terrain vehicles, boat landing, construction of docks and wharves). Cottage development and other similar activities in the area in which the species grows could pose additional threats.
Federal ProtectionMore information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
Tubercled Spike-rush is protected by the Nova Scotia Endangered Species Act. Under this Act, it is prohibited to kill, harm, or collect this species.
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada
Status Final posting on SAR registry
Name Amended Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada
Status First posting on SAR registry
Atlantic Coastal Plain Flora Recovery Team
Sherman Boates - Chair/Contact - Government of Nova Scotia
Phone: 902-679-6146 Fax: 902-679-6176 Send Email
Samara Eaton - Chair/Contact - Environment Canada
Phone: 506-364-5060 Fax: 506-364-5062 Send Email
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
11 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- COSEWIC Assessments (1 record(s) found.)
- Response Statements (1 record(s) found.)
- Recovery Strategies (1 record(s) found.)
- Management Plans (1 record(s) found.)
- Orders (2 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Residence Description (1 record(s) found.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
COSEWIC Annual Report - 2010 (2010)Under Canada’s Species At Risk Act (SARA), the foremost function of COSEWIC is to “assess the status of each wildlife species considered by COSEWIC to be at risk and, as part of the assessment, identify existing and potential threats to the species”. During the past year, COSEWIC held two Wildlife Species Assessment Meetings and reviewed the status of 79 wildlife species (species, subspecies, populations). During the meeting of November 2009, COSEWIC assessed or reviewed the classification of the status of 28 wildlife species. COSEWIC assessed or reviewed the classification of an additional 51 wildlife species (species, subspecies and populations) during their April 2010 meeting. For species already found on Schedule 1 of SARA, the classification of 32 species was reviewed by COSEWIC and the status of the wildlife species was confirmed to be in the same category (extirpated - no longer found in the wild in Canada but occurring elsewhere, endangered, threatened or of special concern). The wildlife species assessment results for the 2009-2010 reporting period include the following: Extirpated: 6 Endangered: 39 Threatened: 16 Special Concern: 17 Data Deficient: 1 This report transmits to the Minister the status of 46 species newly classified as extirpated, endangered, threatened or of special concern, fulfilling COSEWIC’s obligations under SARA Section 24 and 25. A full detailed summary of the assessment for each species and the reason for the designation can be found in Appendix I of the attached report. Since its inception, COSEWIC has assessed 602 wildlife species in various risk categories, including 262 Endangered, 151 Threatened, 166 Special Concern and 23 Extirpated. In addition, 13 wildlife species have been assessed as Extinct. Also, to date, 46 wildlife species have been identified by COSEWIC as Data Deficient and 166 wildlife species were assessed as Not at Risk. This year has been a particularly productive year for COSEWIC’s Aboriginal Traditional Knowledge (ATK) Subcommittee. In April 2010 COSEWIC approved the Aboriginal Traditional Knowledge Process and Protocol Guidelines, providing clear and agreed principles for the gathering of Aboriginal Traditional Knowledge to carry out COSEWIC functions as required under Section 15(2) of SARA (See Appendix III of the attached report). We are grateful for the rich and enthusiastic contribution made by community elders and experts in helping the ATK Subcommittee prepare the ATK protocols.
Recovery Document Posting Plans
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