Nota de esclarecimento.

Quinta-feira, 11/10/2018 ocorreu um problema no sistema de periódicos da UEM. Em virtude disso, foi necessário restaurar um backup de 10/10/2018, quarta-feira 08h00.

Assim, solicitamos aos editores que revejam as atividades deste dia, pois elas foram perdidas e devem ser refeitas. Antecipadamente pedimos desculpas pelos transtornos, mas o problema foi alheio as nossas atividades.

Biological interactions in the co-occurrence of Eichhornia azurea and free-floating macrophytes - DOI: 10.4025/actascibiolsci.v31i4.5577

Giuliani Grazyella Marques-Silva, Sidinei Magela Thomaz

Resumo


The dynamic of plant communities is strongly influenced by biological interactions. We studied the effects of Eichhornia azurea on the growth of the free-floating macrophytes Eichhornia crassipes, Salvinia minima, Salvinia auriculata and Limnobium laevigatum. The experiments were carried out in three lakes of the upper Paraná river floodplain. We used 0.5 m side squares where these species grew for 11 days (S. auriculata and L. laevigatum) and 17 days (E. crassipes and S. minima), in the presence and absence of E. azurea. There were no significant differences between the relative growth rates of macrophytes growing in the absence and presence of E. azurea. The relative interaction index showed the existence of competition between E. azurea and L. laevigatum, and neutrality with the other three species. There was no evidence of facilitation related to the improvement of physico-chemistry characteristics that could enhance macrophytes growth. However, we do not discard a ‘mechanical’ facilitation between E. azurea, which offers protection against wind and waves, and the other species of macrophytes

Palavras-chave


positive interactions; free-floating macrophytes; facilitation; competition; plant communities

Texto completo:

PDF PDF (English) (baixado


DOI: http://dx.doi.org/10.4025/actascibiolsci.v31i4.5577





ISSN 1679-9283 (impresso) e ISSN 1807-863X (on-line) e-mail: actabiol@uem.br

 

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