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Seasonal multi-annual trends in energy densities of the midges (genus Chironomus) in a Mediterranean temporary wetland (Natural Regional Reserve of the Isonzo River Mouth, Northeast Italy)

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Abstract

The present study is an attempt to deepen the knowledge about energy patterns in a detritus-based ecosystem located within a temporary wetland, where changes of water level can affect productivity, turnover of organic matter and the flow-through energy. Energy density was directly measured using an adiabatic bomb calorimeter in samples collected in autumn, spring and summer. Dipterans belonging to the genus Chironomus were the most common and representative invertebrates within the study area. Starting from these measures, a predictive model based on the relationship between energy density and percentage of dry weight was developed, validated and applied to build a multi-annual dataset. This model was used to investigate seasonal energy density trends on longer time-scale, in relation to physical and chemical features, weather conditions and decomposition dynamics. The used approach allowed to build a 3-year dataset and to identify clear seasonal trends; moreover, the application of the model highlighted patterns in relation to precipitation regime, decomposition dynamics and the effects due to variations of these features in the investigated temporary detritus-based system over a multi-annual scale.

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Reproduced with permission from Bertoli et al. (2016)

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Acknowledgements

We would like to thank Dr. Fabio Perco and the entire staff of the Natural Regional Reserve of the Isonzo River Mouth for the help. Thanks to Mr. Valter Mian (Municipality of Staranzano) for the data regarding rainfall.

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  1. Department of Life Science, University of Trieste, Via Giorgieri 10, 34127, Trieste, Italy

    Marco Bertoli, Giacomo Brichese, Paolo Pastorino & Elisabetta Pizzul

  2. Zooprophylaxis Experimental Institute of Piemonte, Liguria and Valle D’AOSTA, Via Bologna 148, 10154, Turin, Italy

    Paolo Pastorino & Marino Prearo

  3. Department of Biological and Environmental Science and Technologies, University of Salento, Via Prov.le Lecce, Monteroni, 73100, Lecce, Italy

    Fabio Vignes & Alberto Basset

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Bertoli, M., Brichese, G., Pastorino, P. et al. Seasonal multi-annual trends in energy densities of the midges (genus Chironomus) in a Mediterranean temporary wetland (Natural Regional Reserve of the Isonzo River Mouth, Northeast Italy). Hydrobiologia 823, 153–167 (2018). https://doi.org/10.1007/s10750-018-3703-z

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