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Direct and indirect effects of an invasive omnivore crayfish on leaf litter decomposition

Invasive alien species (IAS) can disrupt important ecological functions in aquatic ecosystems; however, many of these effects are not quantified and remain speculative. In this study, we assessed the effects of the invasive crayfish Procambarus clarkii (Girard, 1852) on leaf litter decomposition (a key ecosystem process) and associated invertebrates using laboratory and field manipulative experiments. The crayfish had significant impacts on leaf decomposition due to direct consumption of leaf litter and production of fine particulate organic matter, and indirectly due to consumption of invertebrate shredders. The invertebrate community did not appear to recognize P. clarkii as a predator, at least in the first stages after its introduction in the system; but this situation might change with time. Overall, results suggested that the omnivore invader P. clarkii has the potential to affect detritus-based food webs through consumption of basal resources (leaf litter) and/or consumers. Recognizing that this IAS is widespread in Europe, Asia and Africa, and may attain high density and biomass in aquatic ecosystems, our results are important to develop strategies for improving stream ecosystem functioning and to support management actions aiming to control the invasive omnivore P. clarkii.
- University of Minho Portugal
- Universidade Lusófona do Porto Portugal
- CENTRO INTERDISCIPLINAR DE INVESTIGACAO MARINHA E AMBIENTAL Portugal
- Universidade do Porto Portugal
Asia, Food Chain, Invasive alien species, Detrital food webs, Astacoidea, Rivers, Animals, Water Pollutants, Biomass, Ecosystem, Science & Technology, Litter decomposition, Procambarus clarkii, Europe, Plant Leaves, Biodegradation, Environmental, Streams, Africa, Introduced Species
Asia, Food Chain, Invasive alien species, Detrital food webs, Astacoidea, Rivers, Animals, Water Pollutants, Biomass, Ecosystem, Science & Technology, Litter decomposition, Procambarus clarkii, Europe, Plant Leaves, Biodegradation, Environmental, Streams, Africa, Introduced Species
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).16 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10% visibility views 9 download downloads 2 - 9views2downloads
Data source Views Downloads Universidade do Minho: RepositoriUM 9 2


