Earthworm communities of tropical rain forests

Fragoso, Carlos; Lavelle, Patrick

doi:10.1016/0038-0717(92)90124-g

Cited by 160 publications

(108 citation statements)

References 24 publications

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“…Out of seventeen earthworm species, thirteen species were found in managed tea plantation and fifteen species in degraded tea plantation. Occurrence of minimum number of four species in the managed tea plantation, five species in the degraded tea plantation and a maximum of twelve and thirteen species in the managed tea plantation and degraded tea plantation, respectively, are well within the reported range of 4-14 earthworm species in a given community (Fragoso and Lavelle, 1992). In general, eleven earthworm species viz., 1 were common to both managed tea plantation and degraded tea plantation.…”

Section: Resultssupporting

confidence: 66%

“…m ) in managed tea plantation was correlated with its low biodiversity. Species diversity of earthworms in tropical forest ranges from 1.7 to 6.5 (Fragoso and Lavelle, 1992). Thus, earthworm diversity in managed tea plantation (0.66) with anthropogenic interferences is far lower than that of tropical rain forest (Fragoso and Lavelle, 1992;Chaudhuri and Nath, 2011) but close to the value in monoculture pineapple plantation (0.67) (Dey and Chaudhuri, 2014).…”

Section: Resultsmentioning

confidence: 99%

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Species diversity and community characteristics of earthworms in managed and degraded tea plantations of Tripura

Jamatia¹,

Chaudhuri²

2017

JEB

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Aim :Methodology : Results :Interpretation : Tea () is an economically important and intensively managed cash crop in the northeast India. As earthworms represent the highest soil biomass and are good indicators of soil health, the main objective of the study was to find out the impact of conventional management practices (anthropogenic interference) on earthworm biodiversity and relative density of exotic and native species in tea agro-ecosystem.Earthworms were collected adopting TBSF soil monolith (25 cm x 25 cm x 40 cm) by digging and hand-sorting method in the managed tea plantation and degraded tea plantation of Tripura. Physico-chemical parameters of soils (temperature, moisture, organic matter, pH), biological parameters viz., earthworm density, biomass, relative density and ecological parameters (indices of diversity, dominance) were measured.Anthropogenic interferences had greatly influenced the earthworm diversity in tea plantations. Out of total seventeen earthworm species, thirteen and fifteen earthworm species were recorded in the managed tea plantation and degraded tea plantation, respectively. Density (56 ind. m ) and biomass (27 g m ) of exotic species in managed tea plantation were significantly higher (p<0.01) than those of degraded tea plantation (23 ind. m , 17 g m ). Exotic species, and native species, were the dominant species of managed tea plantation and degraded tea plantation. Significantly higher (p<0.01) index of dominance (0.73), lower diversity index (0.66) and lower species richness (0.31) were observed in managed tea plantation compared to those of degraded tea plantation (dominance 0.37, diversity 0.89, species richness 0.77) Low earthworm diversity with high dominance of exotic species in managed tea plantation was due to high anthropogenic activities that favoured the exotic earthworm species over native species. Camelli sinensis Pontoscolex corethrurusDrawida assamensis -2 -2 -2 -2

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Species diversity and community characteristics of earthworms in managed and degraded tea plantations of Tripura

Jamatia¹,

Chaudhuri²

2017

JEB

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“…Likewise, Fragoso and Lavelle (1992) also observed that the Oligochaeta Megadrilli, Coleoptera and Diplopoda were the most abundant taxa. Similar results were found by Ríos de Saluso et al (2001), with the difference that Diplopoda was more numerous than Coleoptera.…”

Section: Discussionmentioning

confidence: 83%

Tillage system does not affect soil macrofauna in southeastern Buenos Aires province, Argentina

Manetti

López

Clemente

et al. 2010

Span. j. agric. res.

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Soil degradation increased incessantly in the Pampas region of Argentina, due to the intensification of agricultural activities, when carried out with conventional tillage (CT) systems. No-tillage system was adopted as conservation practices by the farmers. The objectives of this study were: a) to determine the macrofauna taxa and their relative abundance under CT and NT in two different seasons; and b) to evaluate soil tillage and seasonal effects on the density of the main macrofauna taxa. The study was conducted from 2002 to 2004 in 46 production farms, in Balcarce, Argentina. Ten soil monoliths (25.2 cm side; 30 cm depth) ramdomly directed field at July-August; and at OctoberNovember to determine the number of individuals of macrofauna and Enchytraeidae. Soil macrofauna density did not differ between tillage systems. Oligochaeta Megadrilli density was generally not affected by the tillage system (P > 0.05) except in 2004 when it was greater under CT in July-August (P = 0.0002). Chilopoda density was greater in soils under NT, with significant differences in 2002 in October-November (P = 0.0070). In July-August of 2003 it was higher in CT (P = 0.0109). Diplopoda were more abundant only under NT in July-August 2004 (P = 0.0010). In July-August a significantly (P < 0.05) higher density of Enchytraeidae was found in CT than NT fields. No differences were observed in the taxonomic composition and the relative abundance of the macrofauna when comparing CT and NT. It can be then concluded that in the study region tillage systems affected slightly soil macrofauna and significantly Enchytraeidae.Additional key words: abundance, conventional tillage, no-tillage, soil invertebrates. ResumenEl sistema de labranza no afecta a la macrofauna en el sudeste de la provincia de Buenos Aires, ArgentinaEn la región pampeana argentina se ha producido una creciente degradación del suelo debido a la intensificación de las actividades agrícolas llevadas a cabo con sistemas de labranza convencionales (LC). Los agricultores, como práctica conservacionista, han adoptado la siembra directa (SD). Los objetivos de este estudio fueron determinar los taxa de la macrofauna y su abundancia relativa bajo LC y SD en dos estaciones diferentes y evaluar los efectos de los sistemas de labranza y estaciones sobre la densidad de los principales taxa de la macrofauna. El estudio fue llevado a cabo desde 2002 hasta 2004 en 46 lotes de producción en Balcarce, Argentina. En cada lote se tomaron diez muestras de suelo al azar (de 25,2 cm de ancho y 30 cm de profundidad) en julio-agosto y octubre-noviembre para determinar el número de individuos de la macrofauna y de los Enchytraeidae. La densidad de la macrofauna no difirió entre sistemas de labranza. La densidad de Oligochaeta Megadrilli no fue afectada por el sistema de labranza (P > 0,05), excepto en 2004 cuando fue mayor bajo LC en julio-agosto (P = 0,0002). La densidad de Chilopoda fue mayor bajo SD, aunque solo se observaron diferencias significativas en octubre-noviembre de 2002 (P = 0,007...

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“…In Puerto Rico (as in many other tropical regions), when present, earthworms compose the highest biomass among the soil macrofauna [1]; and thus play important roles in regulating soil processes [20]. The density of macroarthropods (such as myriapodans and crustaceans) is higher at LEF than in tropical sites elsewhere; ants are also an important component of the litter invertebrate community with densities ranging from 500 to 1200 m −2 [13,21].…”

Section: Latitudinal Gradientsmentioning

confidence: 99%

Soil Biology Research across Latitude, Elevation and Disturbance Gradients: A Review of Forest Studies from Puerto Rico during the Past 25 Years

González

Lodge

2017

Forests

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Progress in understanding changes in soil biology in response to latitude, elevation and disturbance gradients has generally lagged behind studies of above-ground plants and animals owing to methodological constraints and high diversity and complexity of interactions in below-ground food webs. New methods have opened research opportunities in below-ground systems, leading to a rapid increase in studies of below-ground organisms and processes. Here, we summarize results of forest soil biology research over the past 25 years in Puerto Rico as part of a 75th Anniversary Symposium on research of the USDA Forest Service International Institute of Tropical Forestry. These results are presented in the context of changes in soil and forest floor biota across latitudinal, elevation and disturbance gradients. Invertebrate detritivores in these tropical forests exerted a stronger influence on leaf decomposition than in cold temperate forests using a common substrate. Small changes in arthropods brought about using different litterbag mesh sizes induced larger changes in leaf litter mass loss and nutrient mineralization. Fungi and bacteria in litter and soil of wet forests were surprisingly sensitive to drying, leading to changes in nutrient cycling. Tropical fungi also showed sensitivity to environmental fluctuations and gradients as fungal phylotype composition in soil had a high turnover along an elevation gradient in Puerto Rico. Globally, tropical soil fungi had smaller geographic ranges than temperate fungi. Invertebrate activity accelerates decomposition of woody debris, especially in lowland dry forest, but invertebrates are also important in early stages of log decomposition in middle elevation wet forests. Large deposits of scoltine bark beetle frass from freshly fallen logs coincide with nutrient immobilization by soil microbial biomass and a relatively low density of tree roots in soil under newly fallen logs. Tree roots shifted their foraging locations seasonally in relation to decaying logs. Native earthworms were sensitive to disturbance and were absent from tree plantations, whereas introduced earthworms were found across elevation and disturbance gradients.

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Earthworm communities of tropical rain forests

Cited by 160 publications

References 24 publications

Species diversity and community characteristics of earthworms in managed and degraded tea plantations of Tripura

Species diversity and community characteristics of earthworms in managed and degraded tea plantations of Tripura

Tillage system does not affect soil macrofauna in southeastern Buenos Aires province, Argentina

Soil Biology Research across Latitude, Elevation and Disturbance Gradients: A Review of Forest Studies from Puerto Rico during the Past 25 Years

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