GROWTH OF TROPICAL HELOPHYTE Echinochloa polystachya (H.B.K.) HITCHCOCK IN JURUMIRIM RESERVOIR (SAO PAULO, BRAZIL)

Autores/as

  • Marcelo Luiz Martins Pompéo Departamento de Zoologia - Instituto de Biociéncias, UNESP, C.P. 510, 18618-000 - Botucatu - SP
  • Viviane Moschini-Carlos Departamento de Zoologia - Instituto de Biociéncias, UNESP, C.P. 510, 18618-000 - Botucatu- SP
  • Raoul Henry Departamento de Zoologia - Instituto de Biociéncias, UNESP, C.P. 510, 18618-000 - Botucatu-SP

Palabras clave:

macrophyte, Echinochloa polystachya, growth, production

Resumen

The growth of emergent macrophyte Echinochloa  polystachya (H.B.K.) Hitchcock in the mouth of Paranapanema River at Jurumirim Reservoir (Sao Paulo, Brazil) was studied  during one year, throughout periodical measurements of  living blades and internodes. Two observations were carried to estimate the
absolute (AGR) and relative growth rate (RGR) and dry matter productivity. The RGR determined in observation two (0.0146 g g/day) was biggest than in observation one (0.0039 g g/day). Its bigger growth attained 2 cm/day, to avoid the stem being drown, particularly at the time of rising water. E. polystachya showed a growth pattern that suggests allocation of resources for rapid stem elongation.

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Número

Vol. 19 Núm. 4 (1999)

Sección

Artículos y Revisiones