title: Microbial activity in surface sediments of Chacopata-Bocaripo lagoon axis, Sucre State, Venezuela.
abstract: The aim of this work was to evaluate the microbial activity of the surface sediments (0-10 cm) of the Chacopata-Bocaripo lagoon axis (Ch-BLA) through microbiological parameters: microbial biomass (Cmic) dehydrogenase activity (DHS), fluorescein diacetate hydrolysis (HFDA), arginine ammonification (AA) and biochemical parameters: phosphatase (PHa) and urease (URa) activity. They were determined during transition (July 2010) and upwelling (March 2011) periods. Total organic carbon (TOC) did not vary significantly (p⩾0.05) between climatic periods. All the parameters studied were higher in upwelling season: Cmic (191.79 mg Cmic kg(-1)), DHS (228.70 μg TFF g(-1) 24 h(-1)), HFDA (204.09 μg fluorescein g(-1) 24 h(-1)), AA (13.09 μg NH4-N g(-1) h(-1)), PHa (132.31 μg pNF g(-1) h(-1)), URa (12.90 μg NH4-N g(-1) h(-1)). They appear to be controlled by the availability and quality of nutrients in each climatic period, and were useful tools for evaluating changes in microbial activity in marine sediments.
authors.affiliation: Departamento de Biologia Marina, Instituto Oceanografico de Venezuela, Universidad de Oriente, Nucleo de Sucre, Venezuela. Electronic address: msegnini@gmail.com.
authors.forename: Mary Isabel
authors.initials: MI
authors.lastname: Segnini de B
authors.affiliation: Laboratorio de Investigaciones Biologicas, Departamento de Ciencias, Nucleo de Anzoategui, Universidad de Oriente, Venezuela.
authors.forename: Irma
authors.initials: I
authors.lastname: Gómez
authors.affiliation: Departamento de Biologia Marina, Instituto Oceanografico de Venezuela, Universidad de Oriente, Nucleo de Sucre, Venezuela.
authors.forename: Leonor
authors.initials: L
authors.lastname: Brito
authors.affiliation: Departamento de Biologia, Escuela de Ciencias, Núcleo de Sucre, Universidad de Oriente, Venezuela.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Acosta
authors.affiliation: Instituto de Investigaciones Cientificas Boca de Rio, Nucleo de Nueva Esparta, Universidad de Oriente, Venezuela.
authors.forename: Luis
authors.initials: L
authors.lastname: Troccoli
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis; D005452:Fluoresceins / Q000378:metabolism; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology*; D006868:Hydrolysis; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D012621:Seasons; D014510:Urease / Q000378:metabolism; D014687:Venezuela; D014871:Water Microbiology
chemical_list: D005452:Fluoresceins; D002244:Carbon; D010744:Phosphoric Monoester Hydrolases; D014510:Urease; C018506:diacetylfluorescein
keywords: Chacopata-Bocaripo-Venezuela; Microbiological parameters; Sediments