| Jocks Lagoon | |
|---|---|
  Jocks Lagoon Location inTasmania | |
| Coordinates | 41°20′24″S148°18′00″E / 41.34000°S 148.30000°E /-41.34000; 148.30000 |
| Type | Dystrophic |
| Basin countries | Australia |
| Designation | Ramsar site |
| Max. length | 650 m (2,130 ft) |
| Max. width | 150 m (490 ft) |
| Surface area | 18 hectares (44 acres) |
| Max. depth | 2–3 m (6 ft 7 in – 9 ft 10 in) |
| Designated | 16 November 1982 |
| Reference no. | 258[1] |
Jocks Lagoon is an 18-hectare (44-acre) freshwater coastal lagoon in north-easternTasmania,Australia. In 1982, it was designated as a wetland of international importance under theRamsar Convention.[2]
The lagoon is located approximately 5 kilometres (3.1 mi) south-east of the town ofSt Helens. It lies partly on private land and partly at the southern end of the St Helens Pointconservation area. One of a chain of wetlands along St Helens Point, it is 200 to 300 metres (660 to 980 ft) inland from the coast, near adunefield. About 650 metres (2,130 ft) long and 150 metres (490 ft) wide, it isdystrophic, withtannin-stained, low-nutrient, and acidic waters. Water levels fluctuate with rainfall and reach a depth of 2 to 3 metres (6 ft 7 in to 9 ft 10 in).
While the northern half of the lagoon is mainly open water, the southern half is mostly covered with emergentrushes andsedges. Threatened plants recorded from the site, or suspected to be present, includejointed twigsedge,slender twigsedge,zigzag bogsedge,yellow onion orchid anderect marshflower.[3]
A total of 51vascular plant species were recorded from the lagoon by a recent study. Of that total, half were species that grow in swamps or damp areas; vegetation common to dry areas, coastal woodland andMelaleuca forest made up the remainder of the list. The lagoon's aquatic flora is equally rich. Several rare species occur there.[3]
Although Jocks Lagoon is listed as aRamsar Site, it does not meet all four criteria that determine a site as a Ramsar Site. The lagoon does not meet criterion four, which states that a Ramsar Site is one that "supports species at critical stages or provides refuge in adverse conditions."[3]
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41°20′40″S148°18′30″E / 41.34444°S 148.30833°E /-41.34444; 148.30833
