State of the Environment Report 2009
Indicators
Extent and Condition of Lakes and Waterbodies


Indicator description

The extent, condition and trend of lakes and other waterbodies in each bioregion.

Why is it indicative?

Lakes and other waterbodies have an important ecological function and are essential to many species, such as fish and waterbirds. The extent and condition of lakes in IBRA bioregions is basic information for inventory and other managerial purposes. Catchment disturbance, regulation and other land uses have impacted upon lake condition.

Data availability and limitations

  • The Tasmanian Conservation of Freshwater Ecosystem Values (CFEV) Project (Internal linkDPIW 2006) provides an assessment of the comprehensiveness, adequacy and representativeness of waterbodies (lakes) in Tasmania, including their naturalness (condition), which is reported here.
     
  • A comprehensive statewide condition assessment of lakes and waterbodies in Tasmania had not been conducted prior to CFEV, therefore it is not possible to report on the trends and changes in their condition to date.
     

Data

Statewide lake naturalness

Lake naturalness is derived by CFEV using the variables detailed in the Internal linktable.

Lake and waterbody naturalness score (CFEV)internal SOE link to larger image

Statewide measures of lake naturalness

High Medium Low Total
Number of lakes 580 646 120 1346
Percentage total (no.) 43.1 48.0 8.9 100
Area of lakes (ha) 6,176 20,591 110,274 137,042
Percentage total (area) 4.5 15.0 80.5 100

Internal linkCFEV Naturalness Categories

High: lake is in natural or near-natural condition.

Medium: lake has been significantly altered from natural condition.

Low: lake has been severely altered from natural condition.

Bioregions are from IBRA version 5.

Source: Internal linkDPIW 2006 and Internal linkCFEV database, v1.0 2005


Bioregional lake naturalness

Lake naturalness is assessed for each of the IBRA bioregions through the following map links and tables.

Interim Bioregionalisation of Australia (IBRA version 5) — Tasmaniainternal SOE link to larger image

Interactive maps are available through the links below (requires Adobe SVG Viewer).

Number of lakes by CFEV naturalness score in each bioregion

Bioregion High Medium Low Total
No. % No. % No. % No. %
Ben Lomond 4 66.7 0 0 2 33.3 6 100
Central Highlands 411 45.5 470 52.0 22 2.4 903 100
Flinders 7 6.6 87 82.1 12 11.3 106 100
King 4 12.5 10 31.3 18 56.3 32 100
Northern Midlands 1 7.7 3 23.1 9 69.2 13 100
Northern Slopes 4 36.4 1 9.1 6 54.5 11 100
South East 0 0 34 58.6 24 41.4 58 100
Southern Ranges 66 67.3 15 15.3 17 17.3 98 100
West 83 69.7 26 21.8 10 8.4 119 100

View Interactive Excel Table Version

Internal linkCFEV Naturalness Categories

High: Lake is in natural or near-natural condition.

Medium: Lake has been significantly altered from natural condition.

Low: Lake has been severely altered from natural condition.

Bioregions are from IBRA version 5.

Source: Internal linkDPIW 2006 and Internal linkCFEV database, v1.0 2005


Area of lakes by CFEV naturalness score in each bioregion (ha)

High

Medium

Low

Total

Bioregion

Area

%

Area

%

Area

%

Area

%

Ben Lomond

24

11.2

0

0.0

190

88.8

214

100

Central Highlands

3,959

7.0

14,243

25.2

38,282

67.8

56,484

100

Flinders

910

27.3

2,329

70.0

90

2.7

3,329

100

King

8

2.6

65

20.4

247

77.0

320

100

Northern Midlands

6

1.4

73

15.7

383

82.9

462

100

Northern Slopes

260

9.6

44

1.6

2,401

88.7

2,705

100

South East

0

0.0

248

6.8

3,400

93.2

3,649

100

Southern Ranges

529

4.5

3,208

27.5

7,927

68.0

11,663

100

West

480

0.8

380

0.7

57,355

98.5

58,215

100


View Interactive Excel Table Version

Internal linkCFEV Naturalness Categories

High: Waterbody is in natural or near-natural condition.

Medium: Waterbody has been significantly altered from natural condition.

Low: Waterbody has been severely altered from natural condition.

Bioregions are from IBRA version 5.

Source: Internal linkDPIW 2006 and Internal linkCFEV database, v1.0 2005


Related Indicators

Lake and Waterbody ReservationInternal link

Extent and Condition of WetlandsInternal link

River NaturalnessInternal link

Related Issues

An indicator can show trends or changes that apply to one or more environmental issues. The data within an indicator is used to inform an issue report and any related recommendations. A summary of the indicator's relevance to a particular issue can be found within the 'Indicator' section of each of the linked issue reports below.

Aquatic HealthInternal link

Acknowledgment

Information sourced from the Conservation of Freshwater Ecosystem Values Project, Department of Primary Industries and Water (Internal linkCFEV database, v1.0 2005 and Internal linkDPIW 2008).

  External linkTasmanian Planning Commissioninternal SOE link to larger image

  Contact the Commission on:

email: External linksoe@justice.tas.gov.au
Phone: (03) 6233 2795 (within Australia)
Fax: (03) 6233 5400 (within Australia)
Or mail to: Tasmanian Planning Commission, GPO Box 1691, Hobart, TAS, 7001, Australia

 


Last Modified: 1 Mar 2010
URL: http://soer.justice.tas.gov.au/2009/indicator/67/index.php
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