Geocrinia vitellina extent of occurrence is calculated to be 6km2 with an area of occupancy based on suitable habitat estimated at 0.08km2 (Conroy 2001) (Figure 1). The entire range of G. vitellina lies within the Blackwood River National Park, an area managed by Department of Parks and Wildlife and relatively free from major modification. Figure 1: Extent of occurrence for Geocrinia alba (left) and Geocrinia vitellina (right). Status of populations All known populations of both species are considered important. The recognition of discrete populations is however difficult because the of isolation is small and there is an implied consecutiveness along drainage systems (Wardell-Johnson et al. 1995). For the purpose of this plan the following definitions apply: Discrete populations represent discrete management – defined cautiously given the high probability of limited dispersal and the low likelihood of natural dispersal. Discrete populations often occur on separate creek systems, but can also occur on the same creek line (or connecting tributaries) if any one of three factors exist: A physical barrier, such as a road. Given the low dispersal ability of both species, roads may be an effective barrier to population connection. A change in land use. If the land use adjacent to an area of occupancy changes along the creek line this may have a local impact on immediately adjacent frog populations (e.g. water use by adjacent blue gum plantations; spray drift from vineyards). A lack of survey in intervening If calling frogs have been recorded at two places but surveys have not been undertaken in the intervening area, then they are considered discrete populations (also refer to Appendix 1 in Wardell-Johnson et al. 1995 for more details). The uncertainty about presence/absence in the unsurveyed gap is a cautious approach to population definition. A subpopulation is delineated within a population by a distance of 50m along the same creek line but not separated by a physical barrier, change of land use or lack of survey. The known and predicted range of G. alba was surveyed in the early 1990s. This resulted in the number of known populations increasing from 26 recorded in 1991 to 54 in 1993. The definition of a population
Site Name Land Tenure Monitoring Method Extinct Site Name Land Tenure Monitoring Method Extinct GA10 PP PC X GA38 PP PC X GA102 SF/UCL PC GA39a PP PC GA11 PP PC GA39b PP PC PP PC GA39c PP PC X GA12a PP PC GA40 PP PC GA12b PP PC GA41 NP PC GA12c PP PC GA41b NP PC GA12d PP PC GA42 SF/UCL PC X GA12e PP PC, Ex GA42b2010 SF/UCL PC, SC GA13 PP PC GA43 SF/UCL PC, Ex GA14 PP PC, Ex GA44 PP PC, Ex GA15 PP PC, Ex GA45a PP PC, T GA16 PP PC GA45b PP PC, Ex PP PC GA46 NP PC X GA17b PP PC GA47a NP PC X GA17c PP PC GA47a_20 NP PC GA17d RR PC X GA47b NP PC X GA18 PP PC X GA47c NP PC GA19 PP PC X GA47d NP PC X GA1a SF/UCL PC, T GA47e NP PC X GA1b PP PC GA47f NP PC GA2 PP PC X GA47g NP PC GA20 PP PC X GA48 NP PC, Ex GA21 PP PC X GA49 NP PC X GA22 PP PC X GA4a PP PC GA23a RR PC X GA4b PP PC X GA23b PP PC X GA4j PP PC GA24a NP PC GA5 PP PC X GA24b PP PC GA50a NP PC GA24c PP PC GA50b NP PC GA24d PP PC GA50c NP PC X GA24e PP PC GA51 NP PC GA25a NP PC X GA53 PP PC X GA25b PP PC X GA54 NP PC X NP PC X GA55a PP PC GA26a PP PC X GA55b NP PC GA26b PP PC X GA55c NP PC, Ex GA27 PP PC PP PC, Ex GA28 PP PC X PP PC X GA29 PP PC GA56 PP PC GA3 PP PC X GA57 NP PC X GA30 PP PC GA6a NP PC X