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Open AccessArticle

Structural and Functional Variations of the Macrobenthic Community of the Adige Basin along the River Continuum

1
Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
2
Soil and Water Resources Institute, Hellenic Agricultural Organization—Demeter, 57001 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Christophe Piscart
Water 2021, 13(4), 451; https://doi.org/10.3390/w13040451
Received: 27 December 2020 / Revised: 31 January 2021 / Accepted: 5 February 2021 / Published: 9 February 2021
Since the publication of the River Continuum Concept (RCC), the capacity of the longitudinal dimension to predict the distribution of species and ecological functions in river networks was discussed by different river theories. The taxonomic structures and functional attributes of macrobenthic communities were investigated along the river continuum in the river Adige network (Northern Italy), with the aim to test the reliability of RCC theory and clarify the relation between structural and functional features in lotic systems. Distance from the spring was found to be most representative proxy among environmental parameters. The analysis highlighted the decrease of biodiversity levels along the river continuum. The decrease of taxonomic diversity corresponded to the loss in functional richness. The abundances of predator and walker taxa, as well as semelparous organisms, declined along the longitudinal gradient, suggesting variations in community complexity and granulometry. Regression models also depicted the presence of disturbed communities in the central section of the basin, where intensive agricultural activities occur, that affected environmental gradients. Overall, results offered evidences that the river continuum may predict macrobenthic community structures in terms of taxonomic diversity, thus confirming the general validity of RCC. Nonetheless, the functional analysis did not provide equally clear evidences to support the theory. After four decades from its postulation, the RCC is still a reliable model to predict the general macroinvertebrates distribution. However, community functions may respond to a number of local factors not considered in RCC, which could find a declination in other theories. The relations between structural and functional features confirmed to be complex and sensitive to disturbances and local conditions. View Full-Text
Keywords: river continuum concept; longitudinal gradient; functional traits; functional indexes; diversity indexes; river theories; macroinvertebrates river continuum concept; longitudinal gradient; functional traits; functional indexes; diversity indexes; river theories; macroinvertebrates
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MDPI and ACS Style

Gaglio, M.; Aschonitis, V.; Muresan, A.N.; Vincenzi, F.; Castaldelli, G.; Fano, E.A. Structural and Functional Variations of the Macrobenthic Community of the Adige Basin along the River Continuum. Water 2021, 13, 451. https://doi.org/10.3390/w13040451

AMA Style

Gaglio M, Aschonitis V, Muresan AN, Vincenzi F, Castaldelli G, Fano EA. Structural and Functional Variations of the Macrobenthic Community of the Adige Basin along the River Continuum. Water. 2021; 13(4):451. https://doi.org/10.3390/w13040451

Chicago/Turabian Style

Gaglio, Mattias; Aschonitis, Vassilis; Muresan, Alexandra N.; Vincenzi, Fabio; Castaldelli, Giuseppe; Fano, Elisa A. 2021. "Structural and Functional Variations of the Macrobenthic Community of the Adige Basin along the River Continuum" Water 13, no. 4: 451. https://doi.org/10.3390/w13040451

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