Caladenia saggicola (Sagg Spider-orchid)

Advice to the Minister for the Environment and Heritage from the Threatened Species Scientific Committee (TSSC) on Amendments to the list of Threatened Species under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act)

1. Scientific name, common name (where appropriate), major taxon group

Caladenia saggicola (Sagg Spider-orchid)

2. National Context

The species is endemic to Tasmania. The species is currently listed as endangered under the EPBC Act and the Tasmanian Threatened Species Protection Act 1995.

3. How judged by TSSC in relation to the EPBC Act criteria.

TSSC judges the species to be eligible for listing as critically endangered under the EPBC Act. The justification against the criteria is as follows:

Criterion 1 - Decline in numbers

There is no quantitative data available against this criterion.

Criterion 2 - Geographic distribution

The geographic distribution of the species is precarious for the survival of the species and is very restricted. The area of occupancy is 4ha and extent of occurrence is 0.04km2. The species is known from a single population. Continuing decline in the area, extent and quality of habitat is projected due to agricultural development, and fire regimes.

Therefore, the species is eligible for listing as critically endangered under this criterion.

Criterion 3 - Population size and decline in numbers or distribution

The total number of mature individuals is very low, dedicated field surveys having identified a total of 200 individuals in a single population. As continuing decline in the area, extent and quality of habitat is projected due to agricultural development, and fire regimes, the population size and geographic distribution is precarious for the survival of the species.

Therefore, the species is eligible for listing as critically endangered under this criterion.

Criterion 4 - Population size

The number of mature individuals is very low with the total population recorded to number 200 mature individuals.

Therefore, the species is eligible for listing as endangered under this criterion.

Criterion 5 - Probability of extinction in the wild

There is no quantitative data available against this criterion.

4. Conclusion

The species exists in very low numbers (200) in a single population. The geographic distribution, area of occupancy being 4ha and extent of occurrence, 0.04km2, is precarious for the survival of the species in the face of projected declines in the area, extent and quality of habitat due to agricultural development and fire regimes. The species is eligible for listing as critically endangered under criteria 2 and 3.

5. Recommendation

TSSC recommends that the list referred to in section 178 of the EPBC Act be amended by
transferring from the endangered category to the critically endangered category:

Caladenia saggicola (Sagg Spider-orchid)