Comparison of three shredders response to acute stress induced by eucalyptus leaf leachates and copper: single and combined exposure at two distinct temperatures

Gama, Mafalda; Guilhermino, Lúcia; Canhoto, Cristina

doi:10.1051/limn/2014006

Cited by 13 publications

(4 citation statements)

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“…Our study showed that 1) fungal colonization was lower in exotic than in the native leaf litter and 2) the contribution of macroinvertebrates to leaf decomposition (as reflected by k C : k F ) was more important in native than in exotic leaves, although no differences were found in the macroinvertebrate density. In accordance with the NWH, fungi may better colonize the litter from those species they have co-evolved with, and macroinvertebrates may lower the effect on exotic leaves because they are not pre-adapted to their secondary compounds (Callaway & Ridenour, 2004; Gama et al, 2014). Moreover, the greater fungal colonization may also explain the greater ef-fect of macroinvertebrates on native leaves than on exotic leaves because macroinvertebrates usually prefer more leaves preconditioned by microorganisms (Wright & Covich, 2005).…”

Section: Discussionmentioning

confidence: 91%

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Decomposition and biological colonization of native and exotic leaf litter in a Central Spain stream

Medina-Villar¹,

Alonso²,

Aldana³

et al. 2015

Limnetica

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Decomposition and biological colonization of native and exotic leaf litter in a Central Spain streamRiparian invasion by exotic trees may lead to changes in the quality of leaf-litter inputs to freshwater ecosystems. Leaflitter inputs are especially important in headwater streams, where aquatic food webs largely depend on the organic matter provided by the terrestrial vegetation. In a headwater stream of Central Spain, North of Guadalajara Province (Tagus basin) we compared the decomposition and biological colonization of leaf litter among two exotic (Ailanthus altissima Mill. Swingle and Robinia pseudoacacia L.) and two native trees (Fraxinus angustifolia Vahl. and Populus alba L.) co-existing in riparian zones. We hypothesized a lower biological colonization of exotic leaves due to organisms have not co-evolved with the exotic trees according to the Novel Weapons Hypothesis (NWH) and, consequently, lower decomposition rates of exotic leaves. To test our hypothesis, litter bags with different mesh sizes (coarse (C) and fine (F)), were used to distinguish between the total and microbial decomposition. The litter bags were placed in the stream and recovered after 2, 20, 39, 62 and 82 days of incubation. After each collection, we assessed the amount of remaining litter, analysed the nitrogen (N) and phosphorous (P) in the litter, identified the macroinvertebrates and quantified the fungal biomass. Consistent with our hypothesis, we found greater fungal biomass buildup on native leaves than on exotic leaves. However, decomposition rates (k) were species-specific, being the ranking in C-bags (A. altissima = F. angustifolia > P. alba > R. pseudoacacia) slightly different than in F-bags (A. altissima > F. angustifolia > P. alba > R. pseudoacacia). The k in both the C-bags and F-bags were correlated with leaf traits, such as lignin, acid detergent fibre (ADF) and lignin:P. There was not a clear effect of the exotic species on macroinvertebrate variables, but the contribution of macroinvertebrates to litter decomposition was lower in exotic litter than in native litter, as shown by a lower ratio between k in C-bags and k in F-bags (k C : k F ). Our results supported that invasive species might impact both biological colonization and decomposition rates in stream ecosystems by the addition of different quality leaf litter when compared to native vegetation. The differences in the biological colonization may be explained by the NWH, but differences in the decomposition rates were better explained by litter quality.

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Section: Discussionmentioning

confidence: 91%

“…The density and diversity of invertebrates may be directly affected by exotic trees bearing leaves with high secondary compounds, as is the case of Eucalyptus spp. (Larrañaga et al, 2009;Gama et al, 2014). However, in the Eucalyptus spp.…”

Section: Introductionmentioning

confidence: 99%

Decomposition and biological colonization of native and exotic leaf litter in a Central Spain stream

Medina-Villar¹,

Alonso²,

Aldana³

et al. 2015

Limnetica

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“…; Gama et al . ). Top‐down effects (due to predation risk and predation per se) have been observed in temperate aquatic systems, but there is little information about tropical aquatic environments (for more, see Boyero et al .…”

Section: Discussionmentioning

confidence: 97%

Effects of density and predation risk on leaf litter processing by Phylloicus sp.

et al. 2015

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The allochthonous detritus that accumulates in the substrate of streams is used by aquatic invertebrate shredders for shelter and food. Shredders are considered rare in tropical systems, and little information is available about the role of density effects and predation risk (associated with the perception of predators by prey) in relationship to the resources used by these organisms. The aim of this study was to examine experimentally the effects of increased predation risk and of the density of Phylloicus sp. (i.e. of two types of biological relationships) on the processing of the leaf litter of Nectandra megapotamica (Spreng.) Mez. Phylloicus sp. can use leaf litter for case building and as a food resource. The density effect was measured using four treatments that differed only in the number of individuals (one, two, three or four). A second experiment with five treatments was performed to test the risk of non-lethal predation on detritus consumption (shelter and food) by Phylloicus sp. (T1: Caddisfly; T2: Mayfly; T3: Astyanax sp./fish; T4: Damselflies; T5: Stonefly). A single Phylloicus and one other organism (a potential predator blocked with 0.5 mm fine mesh) were placed in each tank (0.002 m 3 volume). We observed a negative effect of density on per capita litter consumption (experiment 1). The low density of Phylloicus may be a natural factor that decreases intraspecific competition. In the presence of fish, Phylloicus showed the lowest amount of litter processing observed in the experiment, indicating top-down control (experiment 2). In treatments that involved the presence of invertebrates (non-predatory and predatory), Phylloicus showed the highest amount and an intermediate amount of leaf litter processing, respectively (experiment 2). This observation also suggests that the predation effect is more probable for specific predatorprey pairs. Population density and predation risk in Phylloicus may be important factors controlling leaf litter processing.

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“…Unfortunately, further exploitation of these resources could negatively impact streams and consequently aquatic organisms by increased deforestation, erosion, streambed modification and associated disturbances. It is therefore important to preserve these water resources and maintain their good ecological status (Gama et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Diversity, distribution and habitat requirements of aquatic insect communities in tropical mountain streams (South-eastern Guinea, West Africa)

Edia

Castella

Konan

et al. 2016

Ann. Limnol. - Int. J. Lim.

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Considering that knowledge of the biodiversity of a region is the first step toward its conservation and given the paucity of studies on aquatic insects from the Simandou streams, the diversity of these communities was assessed. Aquatic insects were sampled with a hand-net (mesh size: 250 mm) on four occasions between March 2011 and September 2012 at 27 sites. Environmental variables were also recorded. Overall, 129 taxa belonging to 51 families and eight orders were recorded. Multivariate analyses gathered sites into three clusters in regard to aquatic insect composition. The rarefied taxonomic richness showed decreases in association with increasing levels of human impact. Cluster 1 that contained most disturbed sites displayed low taxonomic richness compared with the two others. The highest taxonomic richness was registered in cluster 2 that contained a mixture of upland and lowland sites; the latter remained minimally disturbed. These sites could be considered as reference sites in studies for assessing water quality. Generalised additive models calculated for the most frequent taxa showed that water temperature, dissolved oxygen, conductivity and pH were the incorporated explanatory variables. Therefore, further anthropogenic activities should preserve the surrounding forest in order to preserve the quality of Simandou streams and consequently aquatic biodiversity.Key words: West Africa / mountain streams / generalized additive models / taxonomic diversity / aquatic insects for the apparent popularity of these communities as bioindicators are that they are ubiquitous, species-rich and long-lived. Given their ability to integrate temporal conditions, they provide evidence of environmental conditions over long periods of time (Imoobe and Ohiozebau, 2009).

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Comparison of three shredders response to acute stress induced by eucalyptus leaf leachates and copper: single and combined exposure at two distinct temperatures

Cited by 13 publications

References 80 publications

Decomposition and biological colonization of native and exotic leaf litter in a Central Spain stream

Decomposition and biological colonization of native and exotic leaf litter in a Central Spain stream

Effects of density and predation risk on leaf litter processing by Phylloicus sp.

Diversity, distribution and habitat requirements of aquatic insect communities in tropical mountain streams (South-eastern Guinea, West Africa)

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