• Proposed
  • Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
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Haloaleurodiscus mangrovei N. Maek., Suhara & K. Kinjo

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Scientific name
Haloaleurodiscus mangrovei
Author
N. Maek., Suhara & K. Kinjo
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Russulales
Family
Incertae sedis
Assessment status
Under Assessment
Proposed by
Catia Canteiro
Assessors
Susana P. Cunha, Susana C. Gonçalves
Comments etc.
Catia Canteiro

Assessment Notes

I chose DD because of the lack of records and possibility of a larger distribution, but now I wonder if I should consider a threat category due to the global sea level rise even with the lack of information. However, I’m having trouble getting an estimate for population decline. This was done for Scleroderma bermudense using A3c (not sure if there are more species), but they had data that related projected increase in sea level rise (SLR) and loss of area in the Caribbean.

NASA has compiled information (from IPCC report) for SLR for Japan and Ishigaki, a neighboring island of Iriomote, but I haven’t found projections for changes in area.
Specifically for loss of Mangrove in Asia, there is one study for Vietnam (https://doi.org/10.1007/s10113-022-01925-z) which predicts loss of 0.22% or 0.54% per year by 2100, despendin on the surface elevation change scenario. Assuming this loss is constant for 50 years in the future this would give at most 27% (NT) or 11% (LC). For the SLR scenario they consider more reasonable, they also mention a prediction of total area loss of 15.74% - 45.84% between 2013 and 2100, depending on the surface elevation change scenario. This corresponds at most to -29,7% in 50yrs with a exponential decline, so NT would most likely be more appropriate. Authors also mention that annual rates they predict are similar to studies done for other regions (Pacific Islands and Caribbean)

For past changes, criterion A2 gives at most NT using data from “Global Forest Resources Assessment 2020 Main report”, by FAO (Table 31 gives data on Mangrove area between 1990 and 2020) with a decline of approximately 20% in 50yrs for all of Asia. However, if considering data for only East Asia then net change is positive, with an increase in Mangrove area, so assessment would fall on LC using A2.

Justification

Haloaleurodiscus mangrovei is a corticioid mangrove species found in Japan. It is only known from one site, but DNA sequencing suggests that it may have a wider distribution. More research is needed to estimate population size and distribution, so the species is assessed as Data Deficient (DD).


Taxonomic notes

Haloaleurodiscus mangrovei is the type species of the monotypic genus Haloaleurodiscus. It was described in 2005, based on its morphological characteristics and phylogenetic analysis (Maekawa et al., 2005).


Why suggested for a Global Red List Assessment?


Geographic range

Fructifications have only been documented in one site in the Iriomote Island in Japan (Maekawa et al., 2005). However, DNA sequencing records in sediments from Brazil, Germany, Canada, Vietnam and China (GBIF.org, 2023) suggest that it may have a wider distribution.


Population and Trends

H. mangrovei fruit bodies have only been documented in one site in Japan but its inconspicuous fruiting and need for microscopy in identification likely limit the number of observations. More research is needed to estimate distribution and population size.

Population Trend: Uncertain


Habitat and Ecology

H. mangrovei is an annual resupinate fungi that causes white pocket-rot. It was found growing on a decaying branches and trunks of Sonneratia alba in a Mangrove forest, both above and below the high tide mark. (Maekawa et al., 2005)

Subtropical/Tropical Mangrove Forest Vegetation Above High Tide LevelMangrove Submerged Roots

Threats

The major threat for H. mangrovei is the increasing sea level rise resulting from climate change, to which mangroves are particularly vulnerable to (Gilman et al. 2008). A decrease in habitat area and quality is expected in the future.

Habitat shifting & alteration

Conservation Actions


Research needed

Targeted search efforts in areas of appropriate habitat are needed to estimate population size and distribution.

Population size, distribution & trendsLife history & ecology

Use and Trade


Bibliography

 


Country occurrence

Regional Population and Trends

Country Trend Redlisted