Document Details

A Review of Biological Assessment of Fresh Water Ecosystems in Thailand  

A Review of Biological Assessment of Fresh Water Ecosystems in Thailand

A number of studies concerning biological assessment and monitoring have been carried out in the last ten years. The study sites include shallow streams, medium sized rivers, and reservoirs, mostly around the northern and northeastern parts of Thailand. Several biological assessment techniques have been tested, along with various physico-chemical parameters. The community structure appears to result in slightly more detailed assessments than the BMWP/ASPT scoring system (with adjustments to local fauna) because it takes into account numbers of individuals. The diversity indices system appears to be a good indicator for detecting changes of water qualities. However, the EPT index is limited by sampling technique and habitat types, while Shannon-Weiner's index requires species level identification. An indicator species is often utilised in lentic systems, where plankton is abundant and seasonal succession must be considered. Chironomid pupal exuvia, and fluctuating asymmetry techniques, have also been proposed. Although many biological assessment and monitoring studies have been carried out in Thailand, overall knowledge is fragmented due to a lack of planning and institutional collaboration. More work needs to be carried out in headwaters and deeper rivers, areas where little is known and many problems occur. Combinations of methods will be needed to assess the entire basin.

Published by: Mekong River Commission (MRC) -
Uploaded on: Sep 2008
File size: 461 KB - Language: English
Keyword(s): Environment
Category: Environment

Download