

State and trends of species populations and groups
State and trends of species populations and groups
In severe decline due to loss of critical habitat in Australia and overseas.
Crocodiles - Saltwater
This component has changed from 2011.
- 'Crocodiles' has been moved from Marine environment to Coasts
- 'Crocodiles' has been split into 'Crocodiles - Freshwater' and 'Crocodiles - Saltwater'
The original 2011 summary, grade, trend and confidence levels have been replicated here to assist comparison of changes between reporting cycles.
Populations are healthy and growing under protection from hunting, particularly in the Northern Territory.
Populations increasing
Crocodiles - Freshwater
This component has changed from 2011.
- 'Crocodiles' has been moved from Marine environment to Coasts
- 'Crocodiles' has been split into 'Crocodiles - Freshwater' and 'Crocodiles - Saltwater'
The original 2011 summary, grade, trend and confidence levels have been replicated here to assist comparison of changes between reporting cycles.
Major populations in the Northern Territory are declining because of impacts of cane toads
Populations increasing
Dugongs
This component has changed from 2011.
- The component has been moved from Marine environment to Coasts
The original 2011 summary, grade, trend and confidence levels have been replicated here to assist comparison of changes between reporting cycles.
Good in Torres Strait, and likely good in most of the remote regions of northern Australia, with the likely exception of the northern Great Barrier Reef. Poor and deteriorating in the southern Great Barrier Reef region (south of Cooktown). Stable in south-east Queensland. Declines because of habitat loss, gill netting and extreme weather events in past 5 years.
East in poor condition
Species composition and abundance are altered in some estuaries due to fishing, nutrient addition (leading to eutrophication), reduced freshwater input, and increased marine influence.
Modified by human activities including invasive species, contamination and disease, although the direction of change is variable.
Data poor, but believed to be in good and stable condition in areas away from major human settlements.
Suffered from historical overexploitation, but are currently stable and restoration trials are underway. At threat from disease in some regions.
Assessment Summary Key
Grades
Very good
Human activities or declining environmental conditions have had no or only minor impacts on habitats, species/taxa groups, physical, biogeochemical, biological or ecological processes.
Good
Human activities or declining environmental conditions have had some significant impacts on habitats, species/taxa groups, physical, biogeochemical, biological or ecological processes, but effects are not persistent or substantial on overall habitats, species/taxa groups or processes.
Poor
Human activities or declining environmental conditions have caused substantial changes to habitats, species/taxa groups, physical, biogeochemical, biological or ecological processes, resulting in persistent and substantial effects on habitats, species groups or processes.
Very poor
Human activities or declining environmental conditions have caused widespread changes to habitats, species or processes resulting in loss of habitat, species/taxa groups and ecosystem functioning.
Recent Trends
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Improving
-
Stable
-
Deteriorating
-
Unclear
Confidence
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Adequate: Adequate high-quality evidence and high level of consensus
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Somewhat adequate: Adequate high-quality evidence or high level of consensus
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Limited: Limited evidence or limited consensus
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Very limited: Limited evidence and limited consensus
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Low: Evidence and consensus too low to make an assessment
Comparability
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Comparable: Grade and trend are comparable to the previous assessment
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Somewhat comparable: Grade and trend are somewhat comparable to the previous assessment
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Not comparable: Grade and trend are not comparable to the previous assessment
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Not previously assessed
Comments
Nil.