Table Summary of limits of acceptable change Critical ecological Baseline condition and range of Limits of acceptable change* (based Basis of LAC Level of confidence components, processes natural variation where known on baseline and natural variability) and services Critical component and There is a diversity and range of The areal extent of Ramsar wetland Based on aerial Low: process: Ramsar wetland types which are types does not change by ±20%, i.e. photograph Limited confidence in defined by their geomorphology and interpretation and Geomorphology and estimates of aerial estuarine waters (F) ± 20% from hydrology. geomorphological hydrology extent. 200 hectares mapping by Mowling There is an absence of information Limited data on changes intertidal marshes (H) ± 20% from (2007). relating to the variability in extent and to geomorphology, 44 hectares Critical service: types of wetland around the time of hydrology and vegetation coastal brackish/saline lagoons (J Natural or near-natural listing types since time of listing and K) ± 20% from 375 hectares wetland ecosystem (refer to Chapter 7 of intertidal mud sand or salt flats (G) ECD). ± 20% from 55 hectares. Critical component and Hydrology as a critical component and As above, this LAC is linked to the As above As above process: service is linked to the geomorphology geomorphology of the wetland. of the wetland. Hydrology Critical service: Natural or near-natural wetland ecosystem
Table Summary of limits of acceptable change Critical ecological components, processes and services Baseline condition and range of natural variation where known Limits of acceptable change* (based on baseline and natural variability) Basis of LAC Level of confidence Critical component and process: Geomorphology and hydrology Critical service: Natural or near-natural wetland ecosystem There is a diversity and range of Ramsar wetland types which are defined by their geomorphology and hydrology. There is an absence of information relating to the variability in extent and types of wetland around the time of listing The areal extent of Ramsar wetland types does not change by ±20%, i.e. estuarine waters (F) ± 20% from 200 hectares intertidal marshes (H) ± 20% from 44 hectares coastal brackish/saline lagoons (J and K) ± 20% from 375 hectares intertidal mud sand or salt flats (G) ± 20% from 55 hectares. Based on aerial photograph interpretation and geomorphological mapping by Mowling (2007). Low: Limited confidence in estimates of aerial extent. Limited data on changes to geomorphology, hydrology and vegetation types since time of listing (refer to Chapter 7 of ECD). Critical component and process: Hydrology Critical service: Natural or near-natural wetland ecosystem Hydrology as a critical component and service is linked to the geomorphology of the wetland. As above, this LAC is linked to the geomorphology of the wetland. As above As above
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