Studies on species diversity and abundance of ornithofauna in Thirunnavaya Wetland, Malappuram District, Kerala
Srinla KT, TR Sobha
An ecological investigation of the species diversity and abundance of avian community of wetlands in Thirunnavaya, Malappuram district, Kerala state was carried out during July 2014 to June 2015. Thirunnavaya wetlands were winter shelters for variety of migratory birds and suitable habitat for several resident and resident migratory birds. A total of 67 birds belong to 30 families and 16 orders were recorded during the study period. Out of these, 49 were Residents and 12 were Winter Visitors and 6 were Resident Migratory. The total number of birds in the area varied from 232 to 1460 individuals in a month with the lowest during July 2014 and highest being recorded during December 2014. The orders Ciconiiformes and Passeriformes showed maximum species diversity ((22.38%) followed by Charadriformes and Coraciformes (15&9%) respectively. The remaining orders showed a least diversity. The major threats noticed in the study area were destruction by clay mining, pollution, land mining, over fishing, introduction of invasive species and hunting of fauna. It is expected that this study would provide a preliminary account and importance of various water birds of this area and is useful for further research and assessment.