Research Article
Distribution and Diversity of Oligochaetes in Selected Ponds of Thiruvananthapuram District, Kerala, South India
Table 1
Density of oligochaetes (ind. m−3) in selected ponds during the period 2006-2007.
| | Species identified | PM | PRM | MON | | P1 | P2 | P3 | P1 | P2 | P3 | P1 | P2 | P3 |
| | Naididae | | Dero digitata | 160 | 120 | 160 | 200 | 160 | 120 | 160 | 240 | 160 | | Dero nivea | 200 | 280 | — | 160 | 160 | — | 120 | 200 | — | | Dero obtusa | — | 120 | 120 | — | 160 | 80 | — | 160 | 160 | | Chaetogaster spp. | — | 120 | 160 | — | 240 | 240 | — | 160 | 160 | | Aulophorus furcatus | 240 | 120 | 240 | 160 | 160 | 160 | 160 | 200 | 200 | | Pristina longiseta | 320 | — | — | 160 | — | — | 160 | — | — | | Stylaria fossularis | 160 | 160 | 160 | 120 | 80 | 120 | 120 | 120 | 160 |
| | Aeolosomatidae | | Aeolosoma spp. | — | 80 | — | — | 40 | — | — | 80 | — |
| | Tubificidae | | Tubifex tubifex | 200 | 80 | 240 | 160 | 80 | 160 | 120 | 120 | 120 | | Limnodrilus hoffmeisteri | 120 | — | 80 | 160 | — | 80 | 80 | — | 120 |
| | Total density | 1400 | 1080 | 1160 | 1120 | 1080 | 960 | 920 | 1280 | 1080 | | Species richness | 7 | 8 | 7 | 7 | 8 | 7 | 7 | 8 | 7 |
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