The Benthic Macrofaunal Community in Agricultural Ditches in Kole Paddy Fields, Vembanad Kole Wetlands, India
DOI:
https://doi.org/10.53555/nnpbs.v2i11.699Keywords:
Agricultural ditches, benthic fauna, Vembanad Kole, paddy wetlandsAbstract
Paddy fields are connected by drainage ditches (channels),that are considered as drivers of biodiversity in agricultural areas. The macrobenthic community structure in agricultural ditches of Kole paddy fields, a part of the Ramsar site Vembanad kole wetlands during a complete crop season was analyzed. The macrobenthic fauna belonged to phyla Annelida, Arthropoda and Mollusca and classes Oligochaeta (60.39%), Insecta (39.31%), Mollusca (0.15%) and Hirudinae (0.15%). The class Oligochaeta was represented by Tubificidae, Naididae, Lumbriculidae; Insecta by Diptera, Coleoptera, Odonata; Mollusca by Bivalvia, Gastropoda. Composition of macrobenthos resembled to that of fresh water wetlands and paddy fields. The average number of macrobenthos was 1475±2064 ind./m2. There was an unusually high abundance in May (5155 ind./m2); but the environmental parameters remained usual. The abundance of good quality food or some specific, localized condition acting on a microscale which could not be recorded in the environmental analysis would have resulted in the unusual distribution of the fauna. Highest diversity (3.17) and species richness (1.95) was observed during May 2011 , during the unusual abundance. Predominant functional feeding group was collector gatherers indicating the abundance of fine organic particulate matter (FPOM) in the substrate. No significant correlation emerged between macrobenthic abundance and environmental parameters.
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