Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia
The structure and seasonal changes of earthworm communities were evaluated in a natural savanna and in a improved grass-legume pasture in a Colombian oxisol over a period of 18 months. One plot of 90×90 m was isolated in each of the systems and each month five samples of 1 m2×0.5 m and ten of 20×20×...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer
1998
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| Online Access: | https://hdl.handle.net/10568/42761 |
| _version_ | 1855522152729542656 |
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| author | Jiménez Jaén, J.J. Moreno, Alonso Decaëns, Thibaud Lavelle, Patrick M. Fisher, Myles J. Thomas, Richard J. |
| author_browse | Decaëns, Thibaud Fisher, Myles J. Jiménez Jaén, J.J. Lavelle, Patrick M. Moreno, Alonso Thomas, Richard J. |
| author_facet | Jiménez Jaén, J.J. Moreno, Alonso Decaëns, Thibaud Lavelle, Patrick M. Fisher, Myles J. Thomas, Richard J. |
| author_sort | Jiménez Jaén, J.J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The structure and seasonal changes of earthworm communities were evaluated in a natural savanna and in a improved grass-legume pasture in a Colombian oxisol over a period of 18 months. One plot of 90×90 m was isolated in each of the systems and each month five samples of 1 m2×0.5 m and ten of 20×20×20 cm were randomly selected from a stratified block design. Species richness was similar in the two evaluated plots (seven species), whereas diversity measured by the index, H (Shannon and Weaver 1949) was clearly different, i.e. H=2.89 in natural savanna and H=1.29 in pasture. This is explained by differences in earthworm community structure. The average annual density in the savanna was 49.8, ranging from 10.8 to 135.8 individuals (ind) m–2, and biomass was 3.3 g m–2 (hand-sorting method), ranging from 0.9 to 11.5 g m–2. In the man-made pasture, density was 80.1 ind m–2 on average, ranging from 24 to 215.8 ind m–2 and biomass was more than tenfold higher, ranging from 29.2 to 110.4 g m–2. This was especially due to the presence of a large glossoscolecid anecic species, Martiodrilus carimaguensis Jiménez and Moreno, which has been greatly favoured by conversion of savanna to pasture. Endogeic species were dominant in the natural savanna whereas the anecic species accounted for 88% of total earthworm biomass in the pasture. Total earthworm density and biomass were significantly different in the two systems studied (t-test). The results indicate a clearly positive response of earthworm communities to improved pastures, a type of land use that is being increasingly adopted in moist neotropical savannas. |
| format | Journal Article |
| id | CGSpace42761 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1998 |
| publishDateRange | 1998 |
| publishDateSort | 1998 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace427612024-08-27T10:35:37Z Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia Jiménez Jaén, J.J. Moreno, Alonso Decaëns, Thibaud Lavelle, Patrick M. Fisher, Myles J. Thomas, Richard J. oligochaeta savannas ferralsols sabanas ferralsoles biomasa The structure and seasonal changes of earthworm communities were evaluated in a natural savanna and in a improved grass-legume pasture in a Colombian oxisol over a period of 18 months. One plot of 90×90 m was isolated in each of the systems and each month five samples of 1 m2×0.5 m and ten of 20×20×20 cm were randomly selected from a stratified block design. Species richness was similar in the two evaluated plots (seven species), whereas diversity measured by the index, H (Shannon and Weaver 1949) was clearly different, i.e. H=2.89 in natural savanna and H=1.29 in pasture. This is explained by differences in earthworm community structure. The average annual density in the savanna was 49.8, ranging from 10.8 to 135.8 individuals (ind) m–2, and biomass was 3.3 g m–2 (hand-sorting method), ranging from 0.9 to 11.5 g m–2. In the man-made pasture, density was 80.1 ind m–2 on average, ranging from 24 to 215.8 ind m–2 and biomass was more than tenfold higher, ranging from 29.2 to 110.4 g m–2. This was especially due to the presence of a large glossoscolecid anecic species, Martiodrilus carimaguensis Jiménez and Moreno, which has been greatly favoured by conversion of savanna to pasture. Endogeic species were dominant in the natural savanna whereas the anecic species accounted for 88% of total earthworm biomass in the pasture. Total earthworm density and biomass were significantly different in the two systems studied (t-test). The results indicate a clearly positive response of earthworm communities to improved pastures, a type of land use that is being increasingly adopted in moist neotropical savannas. 1998-11-16 2014-09-24T07:58:32Z 2014-09-24T07:58:32Z Journal Article https://hdl.handle.net/10568/42761 en Limited Access Springer |
| spellingShingle | oligochaeta savannas ferralsols sabanas ferralsoles biomasa Jiménez Jaén, J.J. Moreno, Alonso Decaëns, Thibaud Lavelle, Patrick M. Fisher, Myles J. Thomas, Richard J. Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title | Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title_full | Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title_fullStr | Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title_full_unstemmed | Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title_short | Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia |
| title_sort | earthworm communities in native savannas and man made pastures of the eastern plains of colombia |
| topic | oligochaeta savannas ferralsols sabanas ferralsoles biomasa |
| url | https://hdl.handle.net/10568/42761 |
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