With regard to flora, the human interference on Pulau Ubin has led to semi-natural vegetation dominated by relatively few early successional species and 21% of alien species.
The Ubin flora represents about one eighth of the total flora recorded for Singapore and is made up largely of common weed, secondary forest and mangrove species.
In a recent survey (Turner, 1993), only one real rainforest tree was discovered. The author states that from a Singapore standpoint, the patches of belukar and mangrove are of value in a country with so little natural vegetation remaining.
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