Effects of invertebrate patch use behaviour and detritus quality on reed leaf decomposition in aquatic systems: A modelling approach

Alemanno, Sara; Mancinelli, Giorgio; Basset, Alberto

doi:10.1016/j.ecolmodel.2007.03.009

Cited by 19 publications

(3 citation statements)

References 68 publications

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“…Changes in the proportion of terrestrial versus autotrophic organic matter may thus influence litter breakdown dynamics. Generally, litter breakdown involves microbial decomposers and detritivorous animals (Alemanno, Mancinelli & Basset, 2007; Gessner et al. , 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental shading alters leaf litter breakdown in streams of contrasting riparian canopy cover

et al. 2011

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1. Headwater stream ecosystems are primarily heterotrophic, with allochthonous organic matter being the dominant energy. However, sunlight indirectly influences ecosystem structure and functioning, affecting microbial and invertebrate consumers and, ultimately, leaf litter breakdown. We tested the effects of artificial shading on litter breakdown rates in an open-canopy stream (high ambient light) and a closed-canopy stream (low ambient light). We further examined the responses of invertebrate shredders and aquatic hyphomycetes to shading to disentangle the underlying effects of light availability on litter breakdown. 2. Litter breakdown was substantially slower for both fast-decomposing (alder, Alnus glutinosa) and slow-decomposing (beech, Fagus sylvatica) leaf litters in artificially shaded stream reaches relative to control (no artificial shading) reaches, regardless of stream type (open or closed canopy). 3. Shredder densities were higher on A. glutinosa than on F. sylvatica litter, and shading had a greater effect on reducing shredder densities associated with A. glutinosa than those associated with F. sylvatica litter in both stream types. Fungal biomass was also negatively affected by shading. Results suggest that the effects of light availability on litter breakdown rates are mediated by resource quality and consumer density. 4. Results from feeding experiments, where A. glutinosa litter incubated under ambient light or artificial shade was offered to the shredder Gammarus fossarum, suggest that experimental shading and riparian canopy openness influenced litter palatability interactively. Rates of litter consumption by G. fossarum were decreased by experimental shading in the open-canopy stream only. 5. The results suggest that even small variations in light availability in streams can mediate substantial within-stream heterogeneity in litter breakdown. This study provides further evidence that changes in riparian vegetation, and thus light availability, influence organic matter processing in heterotrophic stream ecosystems through multiple trophic levels.

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Section: Introductionmentioning

confidence: 99%

Experimental shading alters leaf litter breakdown in streams of contrasting riparian canopy cover

et al. 2011

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“…Food response parameters yielded from strategy M3 (application of laboratory temperature response parameters) suggest that food requirements differed between the mesocosms, possibly because the metabolic rate increases with increasing temperature (Enquist et al, 2003;Gillooly et al, 2001). Considering a time-dependent food conditioning process (Alemanno et al, 2007), this process would reach the required level for the coldest mesocosms first and for all others consecutively thereafter. With respect to food shortage at the end of the experiments, two aspects might cancel each other out.…”

Section: Can Temperature Response Parameters Derived From Laboratory mentioning

confidence: 99%

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

Moenickes

Schneider

Mühle

et al. 2011

Journal of Experimental Biology

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SUMMARYPopulation-level effects of global warming result from concurrent direct and indirect processes. They are typically described by physiologically structured population models (PSPMs). Therefore, inverse modelling offers a tool to identify parameters of individual physiological processes through population-level data analysis, e.g. the temperature dependence of growth from size-frequency data of a field population. Here, we make use of experiments under laboratory conditions, in mesocosms and field monitoring to determine the temperature dependence of growth and mortality of Gammarus pulex. We found an optimum temperature for growth of approximately 17°C and a related temperature coefficient, Q 10 , of 1.5°C -1 , irrespective of whether we classically fitted individual growth curves or applied inverse modelling based on PSPMs to laboratory data. From a comparison of underlying data sets we conclude that applying inverse modelling techniques to population-level data results in meaningful response parameters for physiological processes if additional temperature-driven effects, including within-population interaction, can be excluded or determined independently. If this is not the case, parameter estimates describe a cumulative response, e.g. comprising temperature-dependent resource dynamics. Finally, fluctuating temperatures in natural habitats increased the uncertainty in parameter values. Here, PSPM should be applied for virtual monitoring in order to determine a sampling scheme that comprises important dates to reduce parameter uncertainty. Supplementary material available online at

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“…A decomposição em ecossistemas aquáticos é um processo quase que essencialmente microbiológico envolvendo especialmente fungos e bactérias e é dividido em três fases distintas: a lixiviação, sendo uma rápida perda de peso devido à lavagem de componentes solúveis das folhas mortas; o condicionamento, isto é, a modificação da matriz de folha por micro-organismos como resultado das atividades enzimáticas e a fragmentação, ou seja, o desmembramento físico da matéria orgânica particulada grossa, mediada pela alimentação do invertebrado triturador [3]. No processo de condicionamento microbiano destacamse os fungos, que inicialmente colonizam a matéria orgânica iniciando a decomposição foliar através de um ataque aos polissacarídeos estruturais com a produção de enzimas extracelulares, com papel relevante no aumento da palatabilidade foliar para os macroinvertebrados fragmentadores [4].…”

Section: Introductionunclassified

Fungos associados ao processo de decomposição foliar: 2 anos de estudo

Marques

Silva

Armiato

et al. 2015

J. Bioen. Food Sci.

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Effects of invertebrate patch use behaviour and detritus quality on reed leaf decomposition in aquatic systems: A modelling approach

Cited by 19 publications

References 68 publications

Experimental shading alters leaf litter breakdown in streams of contrasting riparian canopy cover

Experimental shading alters leaf litter breakdown in streams of contrasting riparian canopy cover

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

Fungos associados ao processo de decomposição foliar: 2 anos de estudo

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