The role of ciliates within the microbial food web in the eutrophicated part of Kaštela Bay (Middle Adriatic Sea)

Natalia Bojanic; Mladen Šolic; Nada Krstulovic; Stefanija Šestanovic; Živana Nincevic Gladan; Ivona Marasovic; Igor Brautovic

doi:10.3989/scimar.2006.70n3431

Autores/as

Natalia Bojanic Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Mladen Šolic Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Nada Krstulovic Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Stefanija Šestanovic Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Živana Nincevic Gladan Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Ivona Marasovic Institute of Oceanography and Fisheries, S?etalis?te I. Mes?trovic´a
Igor Brautovic University of Dubrovnik, Institute of Marine and Coastal Research

DOI:

https://doi.org/10.3989/scimar.2006.70n3431

Palabras clave:

protistas ciliados, factores bióticos y abióticos, redes tróficas microbianas, mar Adriático

Resumen

Las interacciones entre fitoplancton, bacterioplancton, nanoflagelados heterótrofos (HNF), ciliados y nauplios de copepodos fueron estudiadas en una zona eutrófica de la bahía de Kas?tela desde Mayo de 1998 hasta Noviembre de 1999. Se dedicó una atención especial a la relación entre distintas clases de tamaños de ciliados no loricados (NLC) y otros componentes de las redes tróficas microbianas. Las biomasas de fitoplancton y bacterioplancton estaban principalmente influenciadas por parámentros abióticos. La temperatura de forma indirecta controlaba la variación de la biomasa de HNF, a través de cambios en la biomasa bacteriana y de la fracción de menor tamaño de fitoplancton. Aparte de los nanoflagelados heterótrofos, la biomasa bacteriana estaba afectada por los NLC <103 μm³, longitud celular <20 μm). Pequeños NLC (de una clase de tamaño <104 μm³, LC< 40 μm) podrían limitar el crecimiento de los HNF compitiendo por las bacterias y también por depredación directa sobre ellos. Los NLC >104 μm³ (LC>40 μm) estaban fuertemente correlacionados con los anteriores y presuntamente son los que controlan la fracción de fitoplancton. Durante el período frío del año, la abundancia de HNF estaba regulada por la depredación de ciliados. El importante impacto de los ciliados en verano de 1998 podría estar influenciado por cambios en la composición taxonómica de la comunidad de fitoplancton, como también cuanto mas alto era el factor de eutrofización del área investigada. La depredación por nauplios de copépodo sobre ciliados y su transferencia de carbono a niveles tróficos superiores, parece ser de relativa importancia sólo en el período donde se alcanzan las máximas abundancias. Este trabajo incide en las relaciones que dominan dentro de las redes tróficas microbianas y sugiere que una parte importante de la producción bacteriana, de la biomasa de fitoplancton y HNF podría ser transferida a niveles tróficos superiores a través de las redes tróficas microbianas

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