Research Article
Distribution and Diversity of Oligochaetes in Selected Ponds of Thiruvananthapuram District, Kerala, South India
Table 2
Density of oligochaetes (ind. m−3) in selected ponds during the period 2007-2008.
| | Species identified | PM | PRM | MON | | P1 | P2 | P3 | P1 | P2 | P3 | P1 | P2 | P3 |
| | Naididae | | Dero digitata | 160 | 160 | 200 | 120 | 200 | 160 | 120 | 160 | 120 | | Dero nivea | 240 | 240 | — | 160 | 200 | — | 160 | 120 | — | | Dero obtusa | — | 120 | 160 | — | 80 | 120 | — | 120 | 200 | | Chaetogaster spp. | — | 160 | 120 | — | 120 | 160 | — | 200 | 160 | | Aulophorus furcatus | 160 | 240 | 160 | 200 | 120 | 200 | 160 | 160 | 160 | | Pristina longiseta | 120 | — | — | 120 | — | — | 160 | — | — | | Stylaria fossularis | 200 | 160 | 200 | 240 | 160 | 160 | 80 | 120 | 120 |
| | Aeolosomatidae | | Aeolosoma spp. | — | 40 | — | — | 80 | — | — | 80 | — |
| | Tubificidae | | Tubifex tubifex | 240 | 80 | 160 | 160 | 40 | 240 | 200 | 120 | 120 | | Limnodrilus hoffmeisteri | 40 | — | 80 | 80 | — | 40 | 120 | — | 80 |
| | Total density | 1160 | 1200 | 1080 | 1080 | 1000 | 1080 | 1000 | 1080 | 960 | | Species richness | 7 | 8 | 7 | 7 | 8 | 7 | 7 | 8 | 7 |
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