• Proposed
  • Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Niebla ramosissima Spjut

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Scientific name
Niebla ramosissima
Author
Spjut
Common names
 
IUCN Specialist Group
Lichens
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Lecanorales
Family
Ramalinaceae
Assessment status
Under Assessment
Proposed by
Rikke Reese Naesborg
Assessors
Rikke Reese Naesborg

Assessment Notes

Justification

Very limited known area of occupancy (AOO) of 16 km2 and extent of occupancy (EOO) of 7.65 km2. Threatened by invasive species such as Mesobryanthemum.  Climate change could affect the species through decreased fog regime and potentially sea level rise.


Taxonomic notes

In 1996, N. ramosissima was separated from N. homalea (Ach.) Rundel & Bowler (Spjut 1996). Subsequently, it was lumped back into N. homalea (Bowler and Marsh 2004), but the broad interpretation has since been disputed. The species has morphological features and habitat differences that separates it from N. homalea (Knudsen & Wheeler 2015).


Why suggested for a Global Red List Assessment?

This species is a narrow endemic to San Nicolas Island, California, USA.


Geographic range

This species is a narrow endemic to San Nicolas Island, California. All observations are from the south-south east end of the island, but it could have a slightly wider distribution on the island.


Population and Trends

The species is common on San Nicolas Island, where it can dominate large patches of soil on the south-southeast end of the island. Currently, it appears to be stable.

Population Trend: Stable


Habitat and Ecology

Niebla ramosissima is a terricolous species growing on calcareous soil rich in gypsum.  It is an asexual, clonal species spreading by fragmentation. Wind or erosion easily break off branches that then form a new individual. San Nicolas has a semi-arid climate with Mediterranean characteristics. CAN’T FIND THE RIGHT IUCN CLASSIFICATION SCHEME!

Temperate Grassland

Threats

Several invasive plants (e.g. Mesobryanthemum) have established on the island, and could pose a threat in the future. Climate change could affect the species through decreased fog regime and potentially through sea level rise.

Unspecified speciesHabitat shifting & alterationDroughtsStorms & flooding

Conservation Actions

The island is owned by the Navy and are not open to the general public.  Some areas of the island, including areas where the species occurs, are off limit to most Navy personnel. The species is currently not officially protected. Federal protection would require the Navy to take protective actions.
The species would greatly benefit from removal of invasive plants such as Mesobryanthemum that tends to dominate areas where it establishes.  This may prove to be extremely difficult because of the very rugged terrain on the island.

Site/area managementInvasive/problematic species controlNational level

Research needed

More accurate estimates of population size and trend would inform threat assessment.

Population size, distribution & trends

Use and Trade


Bibliography


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted