Royston Island

Royston Island

Geography
Location	Spencer Gulf
Coordinates
Highest elevation	38 m (125 ft)
Country
Australia

Royston Island (also known as North Island) is an island in South Australia at the northern end of Pondalowie Bay on the south-west extremity of Eyre Peninsula about north-west of the town of Stenhouse Bay. The island has enjoyed protected area status since 1967 and since 1972, it has been part of the Innes National Park.

Description

Royston Island is an island located on the Yorke Peninsula about north-west of the town of Stenhouse Bay at the northern end of Pondalowie Bay within about of Royston Head. The island is fringed with detritus consisting of eroded calcarenite and granite boulders which a talus slope rises to a “relatively flat, plateau-like summit” at a height of above sea level. The island is connected to Royston Head by a “shallow, partially drying reef.” Access to the island is reported as being “probably most accessible by small boat via the north-eastern coast.”

Formation, geology and oceanography

Royston Island was formed about 7000 years ago following the rise of sea levels at the start of the Holocene. Royston Island consists of a calcarenite upper layer over a “pronounced ridge of Lincoln Complex granite.” Royston Island is fringed partly on its north-west and south-east ends by fringing reefs while the waters surrounding its extent drop to a depth of within a distance of on its westside.

Flora and fauna

Flora

A survey carried out during 1982 on Royston Island recorded a total of nineteen plant species. The island’s summit is dominated by a “low, windswept shrubland” consisting of marsh saltbush and coast daisy-bush accompanied by less abundant species such as southern sea-heath, round-leaved pigface and pointed twinleaf. The talus slopes support shribs of nitre-bush, native juniper, cockies tongue, African boxthorn, yellow-flowering sticky goodenia, Austral stork's bill, coastal lignum and ruby saltbush, while calcrete ledges associated with the island’s upper levels are “festooned with climbing bower spinach.”

Fauna

Vertebrate animals are represented by birds and reptiles. As of 1982, little penguins were observed as being the common bird on the island followed by silver gulls. Both bird species used the island as a breeding colony. As of 2011, the status of the little penguin colony was not known. Also in 1982, the island is reported as supporting a “large population of marbled geckos.”

History

European discovery and use

Royston Island is reported as being named after Lord Royston, eldest son of Lord Hardwicke by Matthew Flinders in 1802. The island is also known as “North Island”.

Protected areas status

Further information: Innes National Park

Royston Island first received protected area status along with Middle Island in Pondalowie Bay in 1967 as a fauna reserve declared under the Crown Lands Act 1929. Since 1972, it has been part of the Innes National Park. Since 2012, the waters adjoining the shoreline of Royston Island have been within a habitat protection zone in the South Spencer Gulf Marine Park. Since at least 2014, Royston Island and the other two islands in Pondalowie Bay (from north to south), Middle Island and South South Island, are closed to access by visitors to the national park.

See also

• List of islands of Australia
• List of little penguin colonies