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Ecological Research

, Volume 33, Issue 5, pp 927–934 | Cite as

Effects of the density of the invasive macrophyte Hydrilla verticillata and root competition on growth of one native macrophyte in different sediment fertilities

  • Márcio José Silveira
  • Diego Corrêa Alves
  • Sidinei Magela Thomaz
Original Article
  • 133 Downloads

Abstract

The occurrence of non-native species at high densities may generate competition for resources and possibly exclude native species in various environments. We evaluated the effects of increased densities of the non-native invasive macrophyte Hydrilla verticillata on the growth of the native species Egeria najas in different sediment types and with only root interactions or root + shoot interactions. We tested the hypothesis that the effect of the invasive on the native species is density dependent and that it is greater when competition for light and nutrients occurs (root + shoot interactions). The results of these experiments demonstrated that increased density of the invasive species H. verticillata significantly decreased the growth of the native species independent of sediment type (sand or mud sediments). When plants competed for water and sediment resources (root + shoot interactions), the native species was more impacted by the invasive than when they competed only for water resources (only shoots interacting). Our results show that E. najas is probably unable to colonize sites highly colonized by hydrilla, and this applies to both sand and mud sediments. This outcome suggests that H. verticillata is a threat for E. najas and likely other native submerged species in South America.

Keywords

Submerged macrophytes Exotic species Non-native species Invasions 

Notes

Acknowledgements

We acknowledge with appreciation the comments provided by two reviewers and the handling editor, which improved the quality of our manuscript. We also acknowledge the “Parque Tecnológico da Itaipu” (PDTA/FPTI-BR) for providing a scholarship to MJ Silviera. SM Thomaz is especially thankful to the National Council for Scientific and Technological Development (CNPq) for providing continuous funding through a Research Productivity Grant. Finally, we thank Roberta Becker Rodrigues for helping in laboratory analyses. This research was partially funded by Itaipu Binacional.

Supplementary material

11284_2018_1602_MOESM1_ESM.pdf (152 kb)
Supplementary material 1 (PDF 151 kb)

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Copyright information

© The Ecological Society of Japan 2018

Authors and Affiliations

  1. 1.Department of Biology, Nucleus of Research in Limnology, Ichthyology and AquacultureUniversidade Estadual de MaringáMaringáBrazil
  2. 2.Department of StatisticsUniversidade Estadual de MaringáMaringáBrazil

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