Relationship between phytoplankton and bacterioplankton production in vegetated humic shallow lakes

Alex Aguilar Zurita; Patricia Rodríguez

doi:10.25260/EA.16.26.3.0.223

Autores/as

Alex Aguilar Zurita Defense against desertification and land conservation office (DSyLCD), Ministry of Environment and Sustainable Development (MayDS). Ciudad de Buenos Aires, Argentina (current address). Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires.
Patricia Rodríguez Centro Austral de Investigaciones Científias (CADIC-CONICET)

DOI:

https://doi.org/10.25260/EA.16.26.3.0.223

Resumen

En este trabajo se muestra que la producción primaria del fitoplancton (PP) puede exceder la producción bacteriana (BP) en cuerpos de agua húmicos vegetados, dando como resultado una columna de agua autotrófica, a pesar de ser ambientes restringidos lumínicamente y con alta concentración de carbono orgánico disuelto, sustrato de la producción bacteriana. Intuitivamente, estas condiciones favorecerían el desarrollo de una columna de agua heterótrofa. Por el contrario, en este estudio la BP representó entre 1.3 y 5% de la PP durante la mayor parte de los muestreos.Sólo una vez, durante el verano tardío, BP llegó al 71% de la PP. Si bien no podemos determinar el mecanismo detrás de estos resultados, sí podemos hipotetizar acerca de ellos basados en experimentación y estudios previos en el mismo humedal. De este modo, las condiciones de autotrofia se ven favorecidas principalmente por: i) la naturaleza somera de las lagunas, que amortigua el efecto de la atenuación lumínica al considerar tasas integradas de producción en toda la columna de agua, ii) la presencia de bacterias fotosintéticas anaeróbicas y anoxigénicas bajo la cobertura macrofítica, y iii) tasas elevadas de depredación sobre el bacterioplancton por parte de nanoflagelados heterotróficos.

Biografía del autor/a

Patricia Rodríguez, Centro Austral de Investigaciones Científias (CADIC-CONICET)

Investigadora Adjunta CONICET

Profesora Adjunta Universidad Nacional de Tierra del Fuego (Instituto de Ciencias Polares, Ambiente y Recursos Naturales)

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