Comparative studies on odonata diversity in mangroves and paddy field ecosystems of Malappuram district, Kerala, South India.

Authors

K. T. Sidheek

Abstract

Abundance and diversity of odonates were studied in two different ecosystems of Malappuram district, Kerala, in varying seasons, pre-monsoon, monsoon, and postmonsoon, during March 2019 to February 2020. The ecosystems studied were paddy field and mangrove ecosystem. Paddy field was located in Kottakkal and mangrove ecosystem was located in Kadalundi. In both ecosystems a total of 34 species of odonata including 15 Anisoptera (Dragonflies) and 19 species of Zygoptera (Damselflies) were recorded, which accounts 22.07% of total species of odonates found in kerala. The Libellulidae is the dominant family among Anisoptera. Among Zygoptera the dominant family was Coenagrionidae. The study was carried out by recording dragonflies observed using the line transect method. The study mainly aims the extent of pollution in two different ecosystems because odonates act as indicator of pollution. In two study areas, Kottakkal is more urbanised than Kadalundi. From this study we can observe that 66.6% species (Damselflies and Dragonflies) are observed from Kadalundi and 33.3% are observed from Kottakkal. This study shows the effect of environmental pollution and other human interferences on odonates.