El papel del banco de propágulos en el restablecimiento de macrófitos después de la gestión para la recuperación de un lago somero en el sur de Brasil

  • Taiane H. G. Duarte Biological Science Institute, Limnology Laboratory - Federal University of Rio Grande (FURG). Rio Grande, RS, Brazil.
  • Thaís S. Almeida Biological Science Institute, Limnology Laboratory - Federal University of Rio Grande (FURG). Rio Grande, RS, Brazil.
  • Edélti F. Albertoni Biological Science Institute, Limnology Laboratory - Federal University of Rio Grande (FURG). Rio Grande, RS, Brazil. http://orcid.org/0000-0001-5966-4686
  • Cleber Palma-Silva Biological Science Institute, Limnology Laboratory - Federal University of Rio Grande (FURG). Rio Grande, RS, Brazil. http://orcid.org/0000-0002-2301-4961
Palabras clave: lagos someros subtropicales, emergencia de plántulas, macrófitos acuáticos sumergidos, banco de semillas

Resumen

En los lagos someros subtropicales eutróficos, los macrófitos que flotan libremente pueden ocupar toda la superficie del agua. Eliminar esta vegetación favorece la recolonización de macrófitos sumergidos del banco de propágulos. Nuestro estudio presenta la respuesta del banco de propágulos de un lago somero subtropical después del manejo para reducir su hipertrofia. En marzo de 2016 tomamos muestras del sedimento del lago en 15 puntos a lo largo de tres transectas para investigar la riqueza y la densidad del banco de propágulos por emergencia en el laboratorio. Además, durante siete meses monitoreamos las condiciones de agua trófica y la restauración de la vegetación en el campo. En el laboratorio emergieron 1382 plántulas de ocho especies. Stuckenia pectinata y Chara zeylanica dominaron el banco de propágulos. En el campo identificamos las especies S. pectinata, C. zeylanica y Ludwigia peploides. El banco de propágulos fue homogéneo, sin diferencia (P>0.05) entre las regiones del lago y las transectas. La similitud de Sørensen fue del 54% entre el campo y el laboratorio. Cuando los macrófitos sumergidos crecieron en el campo, se redujo la clorofila-a, el agua permaneció clara y el índice de estado trófico se redujo de hipereutrófico a eutrófico. Concluimos que el banco de propágulos en lagos someros es esencial para el rápido restablecimiento de macrófitos sumergidos después de las estrategias de recuperación, ayudando a mejorar la calidad del agua.

Citas

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Role of the propagule bank in reestablishing submerged macrophytes after removal of free-floating plants for recovery of a shallow lake in Southern Brazil
Publicado
2020-06-30