Species Richness, Community Organization, and Spatiotemporal Distribution of Earthworms in the Pineapple Agroecosystems of Tripura, India

Table 1

Ecological categories, habitat, and morphological and population characteristics of the earthworm species of pineapple plantation in Tripura.

Family and earthworm species	Ecological categories	Habitat	Size () mm	Biomass (g·m^−2)	Density (ind·m^−2)	Relative abundance (%)	Frequency (%)
Megascolecidae
M. houlleti	Epianecic	Surface soil	5–7 × 190–220	1.09 ± 0.50	3.68 ± 0.87	2.52 ± 0.43	14.72 ± 4.64
M. posthuma	Endogeic	0–10 cm	3–5 × 85–90	0.06 ± 0.01	0.16 ± 0.05	0.12 ± 0.09	0.56 ± 1.07
Kanchuria sp.	Endogeic	0–20 cm	4-5 × 180–210	0.32 ± 0.09	0.64 ± 0.06	0.49 ± 0.30	2.78 ± 0.83
K. sumerianus	Endogeic	0–15 cm	2-3 × 70–140	0.05 ± 0.01	0.05 ± 0.03	0.03 ± 0.01	0.28 ± 0.03
Octochaetidae
E. gigas	Endoanecic	0–30 cm, in vertical burrows	8–12 × 195–290	0.72 ± 0.01	0.48 ± 0.02	0.37 ± 0.02	2.78 ± 0.02
E. scutarius	Endogeic	0–15 cm	7–11 × 220–310	0.10 ± 0.03	0.09 ± 0.02	0.06 ± 0.01	0.56 ± 0.05
E. comillahnus	Endogeic	0–15 cm	3–5 × 120–255	0.27 ± 0.06	0.40 ± 0.04	0.28 ± 0.01	1.94 ± 0.07
Eutyphoeus sp.	Endogeic	0–15 cm, in horizontal burrow	4-5 × 160–210	0.09 ± 0.01	0.16 ± 0.07	0.12 ± 0.05	1.11 ± 0.05
E. gammiei	Endoanecic	0–30 cm, in vertical burrows	8–12 × 210–320	0.01 ± 0.03	0.05 ± 0.01	0.03 ± 0.02	0.28 ± 0.08
Moniligastridae
D. assamensis	Endogeic	0–10 cm	3–5 × 50–80	27.29 ± 0.39	115.52 ± 4.96	81.23 ± 1.12	96.94 ± 3.01
D. papillifer papillifer	Epianecic	0–10 cm	2–4 × 50–110	1.33 ± 0.48	4.32 ± 0.93	2.99 ± 0.41	17.78 ± 4.17
D. nepalensis	Endogeic	0–15 cm	4–6 × 70–130	0.25 ± 0.02	0.64 ± 0.35	0.46 ± 0.21	1.67 ± 1.44
Glossoscolecidae
P. corethrurus	Endogeic	0–15 cm soil	3–5 × 50–70	5.61 ± 2.27	16.16 ± 0.93	11.39 ± 0.48	72.22 ± 7.12
Total				37.19 ± 1.97	142.35 ± 4.43

Values represent mean ± standard error (SE); exotic species.