ความหลากชนิดและการกระจายตัวของตัวอ่อนแมลงปอในแม่น้ำพอง

Abstract

Approximately 314 species of adult odonates were recorded their distribution in Thailand. But it is unfortunately, we can not identify them from the immature stage. The present study aimed to investigate species diversity of odonate larvae in the Pong river. Larvae of odonate were collected by pond net in 18 stations from Tad Hong waterfall Loie province to Mahasarakhram wier, Mahasarachram province. The study was conducted once a month during August 2006 to January 2007. The larvae were brought back for rearing in the laboratory. They were fed on mosquitoes larvae and midge larvae. The emerged adults were identified. Twenty two species and 3 unknown species of 20 genera and 10 families occurred in the Pong river. Odonates were more diverse in upland stations where water depth is less than one meter. Dissolved oxygen, water velocity, stream width and altitude from sea level were crucial factors to distribution of the larvae.