State and trends of species populations and groups

Component
Summary
Grade
Very poor Poor Good Very good
Confidence
In Grade In Trend
Comparability
To previous years

In severe decline due to loss of critical habitat in Australia and overseas.

Year(s): 
2016
1
Deteriorating
Confidence (in grade): 
Somewhat adequate
Confidence (in trend): 
Adequate
Comparability (to previous reports): 
Not assessed

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.

Year(s): 
2016
3
Improving
Confidence (in grade): 
Somewhat adequate
Confidence (in trend): 
Somewhat adequate
Comparability (to previous reports): 
Somewhat comparable

Populations increasing

Year(s): 
2011
4
Improving
Confidence (in grade): 
Adequate
Confidence (in trend): 
Adequate
Comparability (to previous reports): 
Not assessed

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

Year(s): 
2016
2
Deteriorating
Confidence (in grade): 
Somewhat adequate
Confidence (in trend): 
Somewhat adequate
Comparability (to previous reports): 
Somewhat comparable

Populations increasing

Year(s): 
2011
4
Improving
Confidence (in grade): 
Adequate
Confidence (in trend): 
Adequate
Comparability (to previous reports): 
Not assessed

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.

Year(s): 
2016
3
Deteriorating
Confidence (in grade): 
Somewhat adequate
Confidence (in trend): 
Somewhat adequate
Comparability (to previous reports): 
Somewhat comparable

East in poor condition

Year(s): 
2011
4
Stable
Confidence (in grade): 
Limited
Confidence (in trend): 
Limited
Comparability (to previous reports): 
Not assessed

Species composition and abundance are altered in some estuaries due to fishing, nutrient addition (leading to eutrophication), reduced freshwater input, and increased marine influence.

Year(s): 
2016
2
Stable
Confidence (in grade): 
Somewhat adequate
Confidence (in trend): 
Somewhat adequate
Comparability (to previous reports): 
Not assessed

Modified by human activities including invasive species, contamination and disease, although the direction of change is variable.

Year(s): 
2016
2
Deteriorating
Confidence (in grade): 
Limited
Confidence (in trend): 
Limited
Comparability (to previous reports): 
Not assessed

Data poor, but believed to be in good and stable condition in areas away from major human settlements.

Year(s): 
2016
3
Stable
Confidence (in grade): 
Very limited
Confidence (in trend): 
Very limited
Comparability (to previous reports): 
Not assessed

Suffered from historical overexploitation, but are currently stable and restoration trials are underway. At threat from disease in some regions.

Year(s): 
2016
2
Stable
Confidence (in grade): 
Limited
Confidence (in trend): 
Limited
Comparability (to previous reports): 
Not assessed
Clark GF, Johnston EL (2016). Coasts: State and trends of species populations and groups. In: Australia state of the environment 2016, Australian Government Department of the Environment and Energy, Canberra, https://soe.environment.gov.au/assessment-summary/coasts/state-and-trends-species-populations-and-groups, DOI 10.4226/94/58b659bdc758b