Trophic interactions in changing landscapes: responses of soil food webs

Hedlund, Katarina; Griffiths, Bryan S.; Christensen, Søren; Scheu, Stefan; Setälä, Heikki; Tscharntke, Teja; Verhoef, H.A.

doi:10.1016/j.baae.2004.09.002

Cited by 110 publications

(81 citation statements)

References 57 publications

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“…The responses of the soil food webs to different tillage may depend on changes in the soil microenvironment, which provides feedback that regulates the structure of the food webs (Hedlund et al, 2004;Scharroba et al, 2012). The SEM analysis highlighted that soil food web structure was closely correlated with the WCS and NO 3 --N (Fig.…”

Section: Effects Of Tillage On the Structure Of Soil Food Websmentioning

confidence: 97%

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Zhang

Lü

et al. 2015

Soil and Tillage Research

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Section: Effects Of Tillage On the Structure Of Soil Food Websmentioning

confidence: 97%

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Zhang

Lü

et al. 2015

Soil and Tillage Research

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“…Intensive tillage exposes bare soil to erosive forces, and also disrupts soil structure reducing microsite diversity reduced along with the structural and functional diversity of their associated microbial communities (Welbaum et al 2004). The disruption of complex food webs in soils can contribute to reduced disease suppressive ability, loss of arbuscular mycorrhizal associations and reduced efficiency of microbially mediated processes such as nutrient recycling, degradation of toxic residues, maintenance of soil structure and aggregation (Hedlund et al 2004;Welbaum et al 2004;Garbeva et al 2006). The bacterial organic matter decomposition pathway is more resistant to disturbance than the fungal pathway and becomes more dominant in highly disturbed systems ( Hedlund et al 2004).…”

Section: The Effects Of Disturbancementioning

confidence: 99%

“…The disruption of complex food webs in soils can contribute to reduced disease suppressive ability, loss of arbuscular mycorrhizal associations and reduced efficiency of microbially mediated processes such as nutrient recycling, degradation of toxic residues, maintenance of soil structure and aggregation (Hedlund et al 2004;Welbaum et al 2004;Garbeva et al 2006). The bacterial organic matter decomposition pathway is more resistant to disturbance than the fungal pathway and becomes more dominant in highly disturbed systems ( Hedlund et al 2004). The effects of disturbance are illustrated by a study that followed the bacterial and fungal communities during the course of one year in a wheat field (Girvan et al 2004).…”

Section: The Effects Of Disturbancementioning

confidence: 99%

Biotic interactions, ecological knowledge and agriculture

Shennan

2007

Phil. Trans. R. Soc. B

179

126

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This paper discusses biotic interactions in agroecosystems and how they may be manipulated to support crop productivity and environmental health by provision of ecosystem services such as weed, pest and disease management, nutrient cycling and biodiversity conservation. Important elements for understanding biotic interactions include consideration of the effects of diversity, species composition and food web structure on ecosystem processes; the impacts of timing, frequency and intensity of disturbance; and the importance of multitrophic interactions. All of these elements need to be considered at multiple scales that depend in part on the range of the movement of the organisms involved. These issues are first discussed in general, followed by an examination of the application of these concepts in agricultural management. The potential for a greater use of ecological management approaches is high; however, owing to the nature of complex interactions in ecosystems, there is some inherent unpredictability about responses to management interventions under different conditions. Such uncertainty needs to be accommodated in the development of recommendations for farm management. This requires an increased emphasis on the effective synthesis of complex and often apparently contradictory information and on field-based adaptive research, monitoring and social learning by farmer/researcher collaborations.

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“…Increased connectance is expected to promote food web structural Robustness to species loss (Dunne et al 2002). On the other hand, disturbance-induced changes in community composition and organization can lead to alternative food web configurations with reduced ability to face additional stressors, depending on the identity and traits of species recovering after disturbance and the distribution of trophic interactions within the food web (Montoya and Solé 2003, Hedlund et al 2004, Jonsson et al 2006, O'Gorman et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Effect of multiple disturbances on food web vulnerability to biodiversity loss in detritus‐based systems

2015

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Citation: Calizza, E., M. L. Costantini, and L. Rossi. 2015. Effect of multiple disturbances on food web vulnerability to biodiversity loss in detritus-based systems. Ecosphere 6(7):124. http://dx.doi.org/10.1890/ES14-00489.1Abstract. Global biodiversity is affected by human pressure and climate change, and the present rate of biodiversity loss is probably higher than ever before. Community composition is also changing, and interspecific interactions are under severe pressure. The extinction of one species within a food web can result in further secondary extinctions, due to bottom-up effects that can be even more intense and less predictable than the direct effects of disturbance, undermining our capacity for ecosystem management and conservation. Here we investigated a metric for assessing the structural stability of food webs in the face of species loss, referred to as ''Resistance'', based on two fundamental web properties: (1) the proportion of key species in the web, a ''key'' species being one whose deletion leads to at least one secondary extinction, and (2) the mean number of secondary extinctions observed per key species deletion. We compared web Resistance with web Robustness (Dunne et al. 2002) based on 12 detritus-based riverine food webs under four species extinction scenarios on various temporal and spatial scales. We investigated the effect of multiple disturbances (extreme flood and river basin urbanization) on community vulnerability to biodiversity loss, assessing the behavior of Robustness and Resistance under the applied species extinction scenarios and testing their dependence on web topology. We estimated the contribution of the rarest and the most dominant species, and that of the most and least connected species, to web Resistance.Urbanization negatively affected community vulnerability to biodiversity loss. Only food web Resistance showed a significant flood effect and interaction between flood and urbanization. The most connected species contributed the most to food web resistance, whereas the rarest and the most abundant species had a similar, intermediate structural importance. Both food web Resistance and the role of selected key species varied across web description scales. Food web Resistance values were coherent across species extinction scenarios, demonstrating the suitability of the proposed approach for quantifying community vulnerability to species loss and the importance of considering food webs in monitoring and impact assessment programs. The approach is thus seen to be a promising research pathway supporting ecosystem management.

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Trophic interactions in changing landscapes: responses of soil food webs

Cited by 110 publications

References 57 publications

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Biotic interactions, ecological knowledge and agriculture

Effect of multiple disturbances on food web vulnerability to biodiversity loss in detritus‐based systems

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