Spatial dissociation between two endogeic earthworms in the Colombian “Llanos”

Jiménez, Juan J.; Rossi, Jean‐Pierre

doi:10.1016/j.ejsobi.2006.07.032

Cited by 35 publications

(11 citation statements)

References 27 publications

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“…(Jiménez et al 2011). The spatial co‐occurrence of these competitive savanna endogeic species that display opposite spatial distributions by occupying different patches (Jiménez and Rossi 2006) is allowed in the GF. Our results agree with the ‘coexistence aggregation model’ (Hanski 1981, Inouye 1999) which suggests that spatial aggregation of competitors at patchily distributed resources (environment) can facilitate coexistence without species having to avoid one another other by spatial segregation or reduced body‐size overlap (Ives 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Spatial segregation of earthworms can be the result of species‐specific differential preference for soil conditions rather than by interspecific competition process. Valckx et al (2009) reported that patches occupied by endogeic species were not associated to clusters were anecic species were present, and Jiménez and Rossi (2006) found that the spatial segregation observed in patches of endogeic earthworms may result from interspecific competition. Our findings do not support the hypothesis of inter‐specific competition in the earthworm community of the GF, unlike other studies in the area (Jiménez et al 2006, Decaëns et al 2009), and other deterministic processes (soil environmental heterogeneity) explained earthworm species co‐occurrence.…”

Section: Discussionmentioning

confidence: 99%

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Soil environmental heterogeneity allows spatial co‐occurrence of competitor earthworm species in a gallery forest of the Colombian ‘Llanos’

Jiménez

Decaëns

Rossi

2012

Oikos

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Disentangling how communities of soil organisms are deterministically structured by abiotic and biotic factors is of utmost relevance, and few data sets on co-occurrence patterns exist in soil ecology compared to other disciplines. In this study, we assessed species spatial co-occurrence and niche overlap together with the heterogeneity of selected soil properties in a gallery forest (GF) of the Colombian Llanos. We used null-model analysis to test for non-random patterns of species co-occurrence and body size in assemblages of earthworms and whether the pattern observed was the result of environmental heterogeneity or biotic processes structuring the community at small scales by means of co-inertia analysis (CoIA). Th e results showed that earthworm species co-occurred more frequently than expected by chance at short distances, and CoIA highlighted a signifi cant specifi c relationship between earthworm species and soil variables. Th e eff ect of soil environmental heterogeneity on one litter-feeding species but also the impact of soil-feeding species on soil physical properties was revealed. Correlogram analysis on the fi rst axis extracted in the CoIA showed the scale of the common structure shared by the fauna and soil variable tables. Th e earthworm community was not deterministically structured by competition and co-occurrence of competing species was facilitated by soil environmental heterogeneity at small scales in the GF. Our results agreed with the coexistence aggregation model which suggests that spatial aggregation of competitors at patchily distributed resources (environment) can facilitate species coexistence.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Soil environmental heterogeneity allows spatial co‐occurrence of competitor earthworm species in a gallery forest of the Colombian ‘Llanos’

Jiménez

Decaëns

Rossi

2012

Oikos

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“…Finally, the importance of competitive exclusion and ecological complementarity in explaining the patchy distribution of species assemblages has been pointed out in the case of earthworm communities (Jiménez & Rossi, 2006; Jiménez et al. , 2006; Decaëns et al.…”

Section: Spatial Patterns At the Community Scalementioning

confidence: 99%

“…, 2009). In the last group, species segregated in distinct patches (see discussion on local spatial patterns) have been found to have a high degree of niche overlap, whereas species coexisting in a given patch display limiting similarity patterns (Jiménez & Rossi, 2006; Jiménez et al. , 2006; Decaëns et al.…”

Section: Spatial Patterns At the Community Scalementioning

confidence: 99%

Macroecological patterns in soil communities

Decaëns

2010

Global Ecology and Biogeography

392

294

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Aim To review published evidence regarding the factors that influence the geographic variation in diversity of soil organisms at different spatial scales. Location Global.Methods A search of the relevant literature was conducted using the Web of Science and the author's personal scientific database as the major sources. Special attention was paid to include seminal studies, highly cited papers and/or studies highlighting novel results.Results Despite their significant contribution to global biodiversity, our taxonomic knowledge of soil biota is still poor compared with that of most aboveground organisms. This is particularly evident for small-bodied taxa. Global patterns of soil biodiversity distribution have been poorly documented and are thought to differ significantly from what is reported above-ground. Based on existing data, it appears that microorganisms do not respond to large-scale environmental gradients in the same way as metazoans. Whereas soil microflora seem to be mainly represented by cosmopolitan species, soil animals respond to altitudinal, latitudinal or area gradients in the same way as described for above-ground organisms. At local scales, there is less evidence that local factors regulate above-and below-ground communities in the same way. Except for a few taxa, the humpbacked response to stress and disturbance gradients doesn't seem to apply underground. Soil communities thus appear weakly structured by competition, although competitive constraints may account for assembly rules within specific taxa. The main factor constraining local soil biodiversity is the compact and heterogeneous nature of soils, which provides unrivalled potential for niche partitioning, thus allowing high levels of local biodiversity. This heterogeneity is increased by the impact of ecosystem engineers that generate resource patchiness at a range of spatio-temporal scales.

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“…Spatial analysis by distance indices, SADIE, a methodology helping to unravel spatial association or dissociation of patches of any two parameters (Perry, 1998;Winder et al, 2005;Jimenez & Rossi, 2006), turned out to be a suitable tool in the analysis of spatial avoidance of polluted patches by soil-living invertebrates. In our data, patches of total abundance of soil invertebrates were not influenced by patches of metal concentrations in the soil.…”

Section: Discussionmentioning

confidence: 99%

Spatial avoidance of patches of polluted chernozem soils by soil invertebrates

et al. 2009

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Soil invertebrates and heavy metal concentrations are heterogeneously distributed in the soil of steppe plots surrounding an iron mining enterprise in southern Russia. This study assesses whether patches of high soil invertebrate abundance coincide with patches of low concentrations of pollutants. For this aim, spatial analysis by distance indices (SADIE) was applied. Three valleys in Belogorye Nature Reserve were chosen. One valley faced the tailing pond to the north and the other two faced south-east or south-west. Two sampling plots were chosen in each valley, 60 m apart from each other. On every plot 16 soil cores were collected from a grid of 4 × 4 units with a 5-m distance between each sample unit. Each soil core had an area of 76 cm 2 and was 12-15 cm deep. All macroinvertebrates were hand-sorted and identified to family. Abundance of soil invertebrates was not controlled by patches of metal concentration in the soil. Epigaeic groups, like insects and other invertebrates inhabiting the litter layer, were not directly associated with local parameters of the soil. On the contrary, belowground invertebrate abundance (elaterid larvae and earthworms) showed significant dissociation with some heavy metal (Fe, Pb, Zn) concentrations in the soil. The patchiness of soil pollution may act as a leading factor of belowground soil invertebrate distribution. The spatial structure of animal populations in industrially transformed soils needs further research.

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Spatial dissociation between two endogeic earthworms in the Colombian “Llanos”

Cited by 35 publications

References 27 publications

Soil environmental heterogeneity allows spatial co‐occurrence of competitor earthworm species in a gallery forest of the Colombian ‘Llanos’

Soil environmental heterogeneity allows spatial co‐occurrence of competitor earthworm species in a gallery forest of the Colombian ‘Llanos’

Macroecological patterns in soil communities

Spatial avoidance of patches of polluted chernozem soils by soil invertebrates

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