Why did many early settlers leave Western Australia by 1832?

Many early settlers left Western Australia by 1832 primarily because they were underprepared for the actual environmental and living conditions of the region, which led them to suffer great privations.12

While the initial establishment of the colony was driven by the "Swan River mania"—a period of enthusiasm following reports that overestimated the fertility of the coastal sand plain—the reality of the settlement proved difficult for the nearly 4,000 people who arrived between 1829 and 1830. As a result of these hardships, the population of the colony dwindled to only 1,500 by 1832.12