Hipótesis: la agrupación Microcystis aeruginosa Kütz.-Nitzschia palea (Kütz.) W. Sm.-bacterias en la laguna Alalay, Cochabamba, Bolivia es de tipo simbiótico
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RevActaNova.
Abstract
Se reporta una floración de Microcystis aeruginosa Kütz. en el plancton de la laguna Alalay, un ecosistema salobre urbano, altamente eutrófico. Las colonias de la cianobacteria estaban a su vez colonizadas por la diatomea Nitzschia palea (Kütz.) W. Sm., una co-ocurrencia que ha sido reportada anteriormente solo dos veces en la literatura. Como parte de la agrupación también se observaron bacterias pleomorfas cuya identidad no se ha establecido. Observaciones de campo y laboratorio, así como una revisión bibliográfica extensa, sugieren que la unión de los tres tipos de organismos es simbiótica, asegurando un suministro constante de nutrientes de origen exógeno y endógeno. Nitzschia palea, además de obtener nutrientes, también se beneficia al mantenerse suspendida en la parte superior de la zona fótica donde la disponibilidad de luz y nutrientes es mayor. En este manuscrito se exploran diversos argumentos para dar sustento a la hipótesis de la simbiosis, como un primer paso hacia la investigación fisiológica y molecular de la asociación.
A bloom of Microcystis aeruginosa Kütz. is reported from the plankton of Alalay Pond, a brackish, urban and highly eutrophic ecosystem. The cyanobacterial colonies were in turn colonized by the diatom Nitzschia palea (Kütz.) W. Sm. This co-occurrence has been previously reported only twice in the literature. As part of the grouping, pleomorphic bacteria were also observed, but their identity could not be established. Field and laboratory observations, as well as a literature revision, suggest that the association of the three types of organisms is symbiotic, assuring a continuous supply of nutrients of exogenous and endogenous origin. Besides obtaining nutrients, Nitzschia palea also benefits from suspension in the upper part of the photic zone, where availability of light and nutrients is higher. In this manuscript, diverse arguments to support the symbiosis hypothesis are explored as a first step towards the physiological and molecular investigation of the association.
A bloom of Microcystis aeruginosa Kütz. is reported from the plankton of Alalay Pond, a brackish, urban and highly eutrophic ecosystem. The cyanobacterial colonies were in turn colonized by the diatom Nitzschia palea (Kütz.) W. Sm. This co-occurrence has been previously reported only twice in the literature. As part of the grouping, pleomorphic bacteria were also observed, but their identity could not be established. Field and laboratory observations, as well as a literature revision, suggest that the association of the three types of organisms is symbiotic, assuring a continuous supply of nutrients of exogenous and endogenous origin. Besides obtaining nutrients, Nitzschia palea also benefits from suspension in the upper part of the photic zone, where availability of light and nutrients is higher. In this manuscript, diverse arguments to support the symbiosis hypothesis are explored as a first step towards the physiological and molecular investigation of the association.
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Vol. 7, No. 2