Biodiversity

Species Profile and Threats Database


For information to assist proponents in referral, environmental assessments and compliance issues, refer to the Policy Statements and Guidelines (where available), the Conservation Advice (where available) or the Listing Advice (where available).
 
In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.

EPBC Act Listing Status Listed as Endangered as Trithuria occidentalis
Listing and Conservation Advices Commonwealth Conservation Advice on Hydatella dioica (Threatened Species Scientific Committee, 2008abx) [Conservation Advice].
 
Recovery Plan Decision Recovery Plan not required, included on the Not Commenced List (1/11/2009).
 
Adopted/Made Recovery Plans
Federal Register of
    Legislative Instruments
Declaration under s178, s181, and s183 of the Environment Protection and Biodiversity Conservation Act 1999 - List of threatened species, List of threatened ecological communities and List of threatening processes (Commonwealth of Australia, 2000) [Legislative Instrument] as Hydatella dioica.
 
Amendment to the list of threatened species under section 178, 181 and 183 of the Environment Protection and Biodiversity Conservation Act 1999 (Cth) (160) (Commonwealth of Australia, 2014h) [Legislative Instrument] as Trithuria occidentalis.
 
State Listing Status
WA: Listed as Critically Endangered (Wildlife Conservation Act 1950 (Western Australia): September 2013 list) as Trithuria occidentalis
Scientific name Trithuria occidentalis [42224]
Family Hydatellaceae:Hydatellales:Liliopsida:Magnoliophyta:Plantae
Species author Benth.
Infraspecies author  
Reference Flora Australiensis 7 (2330 Mar. 1878) 199.
Other names Hydatella dioica [4898]
Distribution map Species Distribution Map

This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.

Illustrations Google Images
http://florabase.calm.wa.gov.au/browse/profile/32658

The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.

Threat Class Threatening Species References
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition and/or habitat degradation by weeds Commonwealth Conservation Advice on Hydatella dioica (Threatened Species Scientific Committee, 2008abx) [Conservation Advice].
Natural System Modifications:Dams and Water Management/Use:Changes in hydrology including habitat drainage Commonwealth Conservation Advice on Hydatella dioica (Threatened Species Scientific Committee, 2008abx) [Conservation Advice].
Residential and Commercial Development:Housing and Urban Areas:Habitat loss, modification and fragmentation due to urban development Hydatella dioica in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006ly) [Internet].

Brown, A., C. Thomson-Dans & N. Marchant, eds. (1998). Western Australia's Threatened Flora. Como, Western Australia: Department of Conservation and Land Management.

Cooke, D.A. (1987). Hydatellaceae. In: Flora of Australia. 45:1-5. Canberra: AGPS.

Council of Heads of Australian Botanic Gardens (CHABG) (1994). Census of plants in botanic gardens. [Online]. Canberra: Australian National Botanic Gardens. Available from: http://www.anbg.gov.au/chabg/census/census.html.

Kelly, A.E., A. Taylor, M.A. Langley, A. Spooner & D.J. Coates (1993). Declared Rare Flora and Other Plants in Need of Special Protection in the Metro Area. Como, Western Australia: Department of Conservation and Land Managment.

Paczkowska, G. & A.R. Chapman (2000). The Western Australian Flora, A Descriptive Catalogue. The Wildflower Society of Western Australia (Inc.), the Western Australian Herbarium, Department of Conservation and Land Management and the Botanic Gardens & Parks Authority.

EPBC Act email updates can be received via the Communities for Communities newsletter and the EPBC Act newsletter.

This database is designed to provide statutory, biological and ecological information on species and ecological communities, migratory species, marine species, and species and species products subject to international trade and commercial use protected under the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). It has been compiled from a range of sources including listing advice, recovery plans, published literature and individual experts. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. Individuals and organisations should consider all the available information, including that available from other sources, in deciding whether there is a need to make a referral or apply for a permit or exemption under the EPBC Act.

Citation: Department of the Environment (2014). Trithuria occidentalis in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Wed, 30 Jul 2014 08:24:37 +1000.