The most recent restoration project occurred on
Penguin Island, in Western Australia in 2014.
Malva preissiana is an essential native plant due to its almost symbiotic relationship with the local seabirds such as the
bridled tern and the
little penguin. The study had two main aims: "to determine if native vegetation cover could be re-established around bridled tern nesting boxes by planting tubestock of berry salt bush (Rhagodia baccata) and bower spinach (Tetragonia implexicoma)", and "to determine if the Australian hollyhock could be grown from seeds around bridled tern nesting boxes”. Berry saltbush (
Atriplex semibaccata) is also known as "creeping saltbush"; it was an important plant in this study because it is also an Australian native plant much like
Malva preissiana and so can be used to help rebuild the habitat that allows
Malva preissiana to grow. It also produces flowers in the form of red berries, which help to sustain a number of native animals and birds, and is typically described as a dense shrub-like bush. It is also an Australian native plant that is common to Australian coastlines, so it flourished in conditions that also benefit
Malva preissiana. They rely on
Malva preissiana to build their nests and prefer to nest on exposed and/or open areas that are close to water so that they can easily hunt for food and watch out for predators. For a large portion of the year, the birds are absent from Penguin Island due to their migration patterns and nomadic nature. The volunteers planted over fifty "nest-tubes" that were designed to support seedling-growth and thus, create a comfortable nesting site for the native birds during breeding season. To create these tubes,
PVC pipes were cut and painted so that they would blend in with the surrounding environment and were then inserted into the ground. When the study began, a large portion of the island had been taken over by introduced species of weeds, and like the project on Seal Island and Middle Shag Island, was also plagued by an introduced Tree Mallow species. A similar project took place on
Seal Island and Middle Shag Island in 2000, whereby the eradication of the introduced
tree mallow species was found to help promote the growth of
Malva pressiana on the islands, thus simultaneously helping support the local bird populations. There was concern that the habitat that allows the native
Malva preissiana to flourish was being negatively impacted by the presence of "thickets of European Tree Mallow" (
Malva arborea), which was introduced to Australia. This
Malva arborea originated in the coastal regions of the
Mediterranean, where it relied on the salty water, "high levels of phosphorus", and consistent winds to grow and propagate. Thus, it is well suited to grow on areas such as Seal Island and Middle Shag Island, which both have similar climates and habitats as Penguin Island. The main concern with the large population and high rate of growth of the European tree mallow was that when this plant died, it left the soil in a damaged state, and also left the ground largely exposed, meaning that the native
Malva preissiana were exposed to the elements and as such, had less chance of successful growth. The report also found that the presence of the native
Malva preissiana played a key role in protecting other native shrubs that also sustain the
soil quality: "the loss of native perennial shrubs which are constantly green and stabilise and maintain the shallow sandy topsoil". ==References==