Water, Air, & Soil Pollution

, 224:1697 | Cite as

Leaf Packs in Impaired Streams: The Influence of Leaf Type and Environmental Gradients on Breakdown Rate and Invertebrate Assemblage Composition

  • Riccardo Cabrini
  • Sergio Canobbio
  • Laura Sartori
  • Riccardo Fornaroli
  • Valeria Mezzanotte
Article

Abstract

The presence of different kinds of leaf packs (native or alien) and environmental gradients can affect the composition and abundance of macroinvertebrate assemblages in freshwater ecosystems, but little is known about the interactive effects. Here, we investigated (1) how environmental gradients could influence leaf packs macroinvertebrates and (2) which was the chief factor (among water quality, mass loss of leaf packs, and flow regime) affecting macroinvertebrate assemblages in impaired streams. We analyzed leaf packs in six sites in impaired streams, characterized by wastewater discharges and dominated by pollution-tolerant macroinvertebrate species. Using principal component analysis, we defined two environmental gradients as follows: a water quality gradient, related to anthropogenic alteration, and a hydromorphological gradient, mostly related to the catchment features. Our results pointed out that, in the tested conditions, biological metrics, such as functional groups and taxa richness, were chiefly influenced by the water quality gradient, while different leaf types in packs influenced the total taxa richness, but did not cause significant variation in the distribution and abundance of macroinvertebrate functional groups. On the contrary, the mass loss differed for different leaf types and was related to the stream and catchment features (mainly flow). This work showed that, in impaired streams, macroinvertebrate assemblages colonizing leaf packs are more influenced by water quality than by leaf types. Thus, the improvement of water quality should be the priority in restoration programs and should be achieved before any effort to restore native riparian vegetation.

Keywords

Macroinvertebrates Functional traits Leaf packs Environmental gradients 

Notes

Acknowledgments

Authors are grateful to ARPA Lombardia, IREALP Foundation (now a branch of ERSAF Lombardia) and Regione Lombardia (Direzione Generale Ambiente, Energia e Reti) for funding and supporting this research.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Riccardo Cabrini
    • 1
  • Sergio Canobbio
    • 1
  • Laura Sartori
    • 1
  • Riccardo Fornaroli
    • 1
  • Valeria Mezzanotte
    • 1
  1. 1.DISATUniversità degli Studi di Milano BicoccaMilanItaly

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