Author: K. Nasira and S. Shamim
Publishing Date: 2018
E-ISSN: 0255-7576
Volume 36 Issue 1
ABSTRACT:
Present study provides the information and estimation on fresh water nematode community structure from various water sources (river, lakes, canals, ponds, reservoirs and irrigation sources: tube well and tanks) and evaluation of feeding categories at eight collecting sites of Sindh. After analysis it was found that different parameters of community structure of fresh water nematodes varied considerably at different surveyed sites. Nematode community analysis revealed that frequency (absolute frequency, relative frequency), density (relative density) and prominence value were variable for nematode population within localities. Relative density of fresh water nematode species of studied sites ranged between 0.7-10.4 % while absolute frequency and relative frequency ranged between 15-98% and 0.86-8.8%, respectively. Analysis of overall occurrence percentage of feeding groups revealed that predators dominated the entire nematode community (35%) followed by bacterivores (32.5%), herbivores (20%), algal feeders and fungivores shared the same occurrence percentage (5%) while the least occurrence percentage was of omnivores (2.5%). These studies add to the knowledge of diversity of fresh water nematodes and evidence on their categorization of the basis of feeding habits and the community structure.Present study provides the information and estimation on fresh water nematode community structure from various water sources (river, lakes, canals, ponds, reservoirs and irrigation sources: tube well and tanks) and evaluation of feeding categories at eight collecting sites of Sindh. After analysis it was found that different parameters of community structure of fresh water nematodes varied considerably at different surveyed sites. Nematode community analysis revealed that frequency (absolute frequency, relative frequency), density (relative density) and prominence value were variable for nematode population within localities. Relative density of fresh water nematode species of studied sites ranged between 0.7-10.4 % while absolute frequency and relative frequency ranged between 15-98% and 0.86-8.8%, respectively. Analysis of overall occurrence percentage of feeding groups revealed that predators dominated the entire nematode community (35%) followed by bacterivores (32.5%), herbivores (20%), algal feeders and fungivores shared the same occurrence percentage (5%) while the least occurrence percentage was of omnivores (2.5%). These studies add to the knowledge of diversity of fresh water nematodes and evidence on their categorization of the basis of feeding habits and the community structure.
Keywords: Fresh water nematodes, Community structure, feeding groups, Sindh, Pakistan