Data doesn't back conclusion on acid rain

Straits Times 24 Sep 09;

WE REFER to the report, 'Native species may be wiped out by acid rain' (Sept 14).

We are puzzled by the report's suggestion that 20 species of animals in Bukit Timah Nature Reserve may be wiped out by acid rain. We have spoken to Associate Professor David Higgitt from the National University of Singapore, and he equally does not share the article's conclusion.

Some tropical streams are naturally acidic. The National Parks Board has embarked on a collaboration with Prof Higgitt to study the cause of acidification of the streams in our nature reserves and to help us better manage the freshwater habitats.

However, the study is in its early stages and it is premature to suggest that acidity of the streams is caused by acid rain, and whether biodiversity has been affected.

The National Environment Agency's monitoring also does not show any increasing trends in rainfall acidity.

We hope this clarifies the facts in this matter.

Sharon Chan (Ms)
Assistant Director
(Central Nature Reserve)
National Parks Board