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Seasonal Abundance and Activity of Pill Millipedes (Arthrosphaera Magna) in Mixed Plantation and Semi-Evergreen Forest of Southern India

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Seasonal Abundance and Activity of Pill Millipedes (Arthrosphaera Magna) in Mixed Plantation and Semi-Evergreen Forest of Southern India Acta Oecologica 29 (2006) 27–32 www.elsevier.com/locate/actoec Original article Seasonal abundance and activity of pill millipedes (Arthrosphaera magna) in mixed plantation and semi-evergreen forest of southern India Krishna M. Ashwini, Kandikere R. Sridhar * Microbiology and Biotechnology, Department of Biosciences, Mangalore University, Mangalagangotri, Mangalore 574 199, Karnataka, India Received 5 July 2004; accepted 18 July 2005 Available online 29 August 2005 Abstract Seasonal occurrence and activity of endemic pill millipedes (Arthrosphaera magna) were examined in organically managed mixed plan- tation and semi-evergreen forest reserve in southwest India between November 1996 and September 1998. Abundance and biomass of milli- pedes were highest in both habitats during monsoon season. Soil moisture, conductivity, organic carbon, phosphate, potassium, calcium and magnesium were higher in plantation than in forest. Millipede abundance and biomass were about 12 and 7 times higher in plantation than in forest, respectively (P < 0.001). Their biomass increased during post-monsoon, summer and monsoon in the plantation (P < 0.001), but not in forest (P > 0.05). Millipede abundance and biomass were positively correlated with rainfall (P = 0.01). Besides rainfall, millipedes in plan- tation were positively correlated with soil moisture as well as temperature (P = 0.001). Among the associated fauna with pill millipedes, earthworms rank first followed by soil bugs in both habitats. Since pill millipedes are sensitive to narrow ecological changes, the organic farming strategies followed in mixed plantation and commonly practiced in South India seem not deleterious for the endangered pill milli- pedes Arthrosphaera and reduce the risk of local extinctions. © 2005 Elsevier SAS. All rights reserved. Keywords: Saprophagous fauna; Pill millipedes; Arthrosphaera magna; Mixed plantation; Semi-evergreen forest 1. Introduction managed mixed plantation of southern India (Ashwini, 2003; Ashwini, 2002). They can also be found in forests but not in Among saprophagous macrofauna, millipedes, earth- chemically managed plantations. Previous studies revealed worms, woodlice and slugs are of considerable value in soil that Julid pill millipede richness was high in natural hetero- humification (Anderson et al., 1983; Morgan et al., 1989). geneous woodlands than in homogeneous plantations (Dan- Richness and diversity of saprophagous fauna are influenced gerfield, 1990; Dangerfield and Telford, 1992). However, by a wide range of landuse, agricultural, forestry and wildlife similar information is lacking on endemic pill millipedes conservation practices (Curry, 1994; Didham et al., 1996; Arthrosphaera. Thus, the specific objectives of the current Edwards and Bohlen, 1995; Wardle, 1995). Climate and lit- study were to investigate seasonal occurrence of two abun- ter chemistry are the most important factors regulating the dant saprophagous invertebrates, earthworms in general and rates of organic matter decomposition affecting decompos- the pill millipedes A. magna in relation to soil edaphic fac- ers and saprophagous invertebrates (Aerts, 1997; Meentenm- tors and climatic features in a mixed plantation and a semi- eyer, 1978). evergreen forest reserve of southern India. In addition, mixed Pill millipedes belonging to the genus Arthrosphaera plantation land use practices that enhanced the abundance of (Order: Sphaerotheriidae) are endemic to southern India and A. magna have been documented. Sri Lanka (Achar, 1986; Achar, 1987; Attems, 1936; Pocock, 1899) and within this genus, Arthrosphaera magna Attems (Attems, 1936) was found to be very abundant in organically 2. Materials and methods * Corresponding author. Fax: +91 824 2287 367. The survey was carried out for 2 consecutive years from E-mail address: [email protected] (K.R. Sridhar). November 1996 to September 1998. The area surveyed 1146-609X/$ - see front matter © 2005 Elsevier SAS. All rights reserved. doi:10.1016/j.actao.2005.07.005 28 K.M. Ashwini, K.R. Sridhar / Acta Oecologica 29 (2006) 27–32 (12°42′N, 75°E) receives precipitation up to 390 cm per 2.3. Soil analysis annum, most of it occurs during southwest monsoon (June– September). Atmospheric temperature fluctuates between All soil parameters were assessed using the soil excavated 23 and 33 °C, while relative humidity between 84 and 96%. for faunal observation. Soil samples were weighed, oven- Rainfall data were obtained from the meteorological records dried at 80 °C up to 24 h and reweighed to determine the of Central Plantation Crops Research Institute, Vittal, Karna- moisture gravimetrically. Soil temperature was measured by taka State, located about 10 km away from the study sites. mercury thermometer at a depth of 15 cm in each sampling point. Soil and distilled water were mixed (1:2.5, w/v), shaken 2.1. Study sites (15 min) and pH was detected using pH meter (Systronics, India; Model 335). The soil–water suspension prepared for Our two study sites include a mixed plantation and an adja- pH determination was used to measure conductivity (Systron- cent forest reserve. The plantation (1 ha) is about 30-year-old ics, India; Model 304). Walkley and Black’s rapid titration and the crops cultivated include: areca (Areca catechu), cocoa method was employed to quantify the organic carbon in soil (Theobroma cacao), banana (Musa paradisiaca) and coco- (Jackson, 1973). Available phosphorus was determined spec- nut (Cocos nucifera). During post-monsoon season (Octo- trophotometrically (Systronics, India; Model 106) based on ber), each tree basin receives 20 kg organic manure (3 months the method outlined by Jackson (Jackson, 1973). Available composted coconut coir pith, coffee husk and poultry manure, potassium was detected using flame photometer (Systronics, 2:2:1 ratio, w/w) and 10 kg farmyard manure (leaf litter and India; Make MK1/MK3) (Jackson, 1973). Exchangeable cal- green leaves seasoned at cattle shed up to 2 months with urine cium and magnesium were determined based on Versenate and dung). In addition, leaf litter generated from the planta- method (Jackson, 1973). tion was heaped at the basin. Plantation receives irrigation through sprinklers (equivalent to 2.5 cm rain) from Decem- 2.4. Statistical analysis ber through May. The interspaces do not receive organic manure, but receive uniform sprinkling of water. The canopy Difference in the biomass of A. magna of plantation and cover of plantation partially allows sunlight. The soil texture forest was assessed by paired t-test and one-wayANOVAwas of plantation is categorized as sandy loam (Kanwar and employed to assess the difference in biomass of Arthrosphaera Chopra, 1981). during post-monsoon, summer and monsoon seasons in plan- The semi-evergreen forest reserve (6 ha) is located adja- tation and forest (Stat Soft Inc., 1995). Pearson correlation cent to the mixed plantation. This forest has thick canopy, was used to investigate the relationship between millipede possesses a large amount of litter on the floor and devoid of abundance and biomass vs. climatic and soil edaphic features human interference. The texture of soil is sandy loam. The (Stat Soft Inc., 1995). Difference in soil edaphic features major tree species of the forest include: Acacia auriculifor- between plantation and forest was evaluated by paired t-test mis, Cinnamomum malabatrum, Dalbergia latifolia, Entanda (Stat Soft Inc., 1995). sp., Holigarna ferruginea, Lagerstroemia microcarpa, Mangifera indica, Mimusops elengi, Piper spp., Sapium sp., Syzygium caryophyllatum, Terminalia chebula and Ziziphus 3. Results mauritiana. Rainfall and soil temperature were seasonal with rain 2.2. Population density occurring during June–December (maximum in July) (Fig. 1). Soil temperature fluctuated between 23 °C (November) and Sampling of A. magna was performed every 2 months from 29 °C (June). Table 1 reveals the seasonal fluctuations of soil November 1996 to September 1998 in the plantation and the edaphic features. Soil moisture, conductivity, organic car- forest. Five replicate samples on each occasion from each bon, phosphate, potassium, calcium and magnesium were site were randomly collected. In the plantation, sampling was higher at plantation than forest. Soil pH was more acidic in restricted to one sample per tree basin, whereas in the forest, forest (5.8) than in plantation (6.3). one sample per plant was collected at a distance of 1–2 m Abundance of pill millipedes in mixed plantation was high- away from tree base. Macrofauna was sampled by forcing est during September 1997, while biomass during July 1997 steel frames (30 × 30 × 30 cm) into the soil, excavated soil (Fig. 2). They were significantly more abundant and had a along with litter (27,000 cm3) was transferred to trays. Bio- higher biomass in the plantation (P < 0.05) than in the forest masses (fresh weight) of millipedes (A. magna, non- (P > 0.05). Millipede biomass was also significantly differed Arthrosphaera spp.) and earthworms were determined to the during post-monsoon, summer and monsoon seasons in the nearest 0.01 g on the sampling spot (Mettler Toledo, Switzer- plantation (P < 0.001), but not in the forest (P > 0.05). In the land; Model PB 303DR). The epigeic (litter-dwelling) and forest, maximum of 2.2 individuals were seen per sample, endogeic (soil-dwelling) macrofauna were enumerated. As while in plantation the values reached up to 26.2 (Fig. 2). ants and termites were numerous, number of colonies per Values for highest biomass in forest and plantation were sample
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