The Isoetes Page

Website of the Isoetes Research Group

Isoetes velata

Primary tabs

EOL Text

Range Description:

Isoetes fluitans is an endemic to Galicia, in northwestern Spain, where it is only known in the high basin of the Mio River (particularly in the tributaries Ladra-Parga-Tmoga) and in some localities of the Galician coast (rivers el Xallas and el Castro, A Corua province). This population is probably extinct, because of the destruction of the flooded forest where it developed. The AOO is 12 km and the actual occupied area is 30.5 ha (Romero et al. 2003).

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101

Habitat and Ecology:

Habitat and Ecology

Isoetes fluitans is an amphibious/aquatic Geophyte, growing on siliceous and sandy substrates in river beds where it remains always submerged. It is frequently associated with species of Littorelletea and Potametea, such as Apium inundatum, Juncus heterophyllus, Nymphoides peltata, Potamogeton crispus, P. berchtoldii or Oenanthe crocata (Romero et al. 2003).

Its fronds, which exceed 65-85 cm length, float at the water surface and are relatively persistent after drying.

Systems

  • Freshwater
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101

Barcode data: Isoetes velata:

The following is a representative barcode sequence, the centroid of all available sequences for this species.


Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorSujeevan Ratnasingham, Paul D.N. Hebert, Barcode of Life Data Systems (BOLD)
Sourcehttp://www.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=444427

Statistics of barcoding coverage: Isoetes velata:

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1

Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorSujeevan Ratnasingham, Paul D.N. Hebert, Barcode of Life Data Systems (BOLD)
Sourcehttp://www.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=444427

IUCN Red List Assessment:
Red List Category

EN
Endangered

Red List Criteria

B2ab(iii,iv)

Version

3.1

Year Assessed

2013

Assessor/s

Lansdown, R.V.

Reviewer/s

Bilz, M. & Lutz, M.L.

Contributor/s

Hugot, L., Bagella, S. & Temple, H.J.

Justification

Isoetes fluitans is listed as Endangered as it has a very small area of occupancy (AOO) of 12 km, the distribution is severely fragmented, and there are continuing declines as a result of pollution and eutrophication which are affecting all subpopulations.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101

Population:

Population

Isoetes fluitans occurs in sparse subpopulations in two main areas: There are seven subpopulations in the high basin of the Mio River (estimated around 57,300 individuals) and five unconnected subpopulations on the Galician coast (estimated around 31,000 individuals) (Romero et al. 2003). The species counts as severely fragmented.

Population Trend

Decreasing
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101

Threats:

Major Threats

Isoetes fluitans is threatened in the totality of its distribution area by uncontrolled pollution and eutrophication (chemicals drained from fields). Moreover, the tourism development on rivers, which leads to create fluvial beaches or to clean the river beds, has eliminated or affected several subpopulations.

The subpopulations of the high basin of Mio River are partly included in the planned Spanish Natura 2000 network.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101

Conservation Actions:

Conservation Actions

In Spain, the species is included in the national Red List of Spain as Endangered (EN) B2ab(iii,iv) under the synonym Isoetes longissimum (Moreno 2008). It is found in Natura 2000 sites in the high basin of Mio River.
The following conservation measures are being proposed:
  • Monitoring and protection of the subpopulations
  • Management of water quality and tourism development
  • Study of the biology and ecology of the species
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/164101
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith