Journal of Marine Biology and Aquaculture
Study of Virioplankton Abundance and Morphological Diversity in a Brazilian Coastal Region Influenced by Upwelling System
- 1Laboratory of Molecular Virology, Departament of Biology Cell and Molecular, Biology Institute, Institute of Biology, Fluminense Federal University, Niterói, Brazil
- 2Laboratory of Biogeochemistry Aquatic Environments, Department of Marine Biology, Institute of Biology, Fluminense Federal University, Niterói, Brazil
- 3Marine Microbiology Laboratory, Department of Marine Biology, Institute of Biology, Fluminense Federal University, Niterói, Brazil
- 4Laboratory of Molecular Biology, Institute of Microbiology Paulo de Goes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Juliana Eymara Fernandes Barbosa, Laboratory of Molecular Virology, Department of Biology Cell and Molecular, Biology Institute, Institute of Biology, Fluminense Federal University, Niterói, Brazil-CEP: 24020150, Tel: 55 212629-2342/2629-2280; E-mail: firstname.lastname@example.org
Barbosa, J.E.F., et al. Study of Virioplankton Abundance and Morphological Diversity in a Brazilian Coastal Region Influenced by Upwelling System.(2016) J Marine Biol Aquacult 2(1): 1- 10.
© 2016 Barbosa, J.E.F. This is an Open access article distributed under the terms of Creative Commons Attribution 4.0 International License
KeywordsVirioplankton; Bacterioplankton; Abundance; Morphological diversity; Environmental factors; Upwelling system; Arraial do Cabo
Marine viruses are among the most common, abundant and diverse biological entities in seawater columns. Despite this, little is yet know about virus abundance and distribution in tropical aquatic ecosystems. Here, we evaluated virus abundance and their relationship to host and environment variables within Arraial do Cabo upwelling system, Rio de Janeiro State, Southeast of Brazil. Seawater samples were collected in four seasonal campaigns from five sampling sites including different areas of human settlement characterized by anthropogenic activity (sewage disposal/port activity) and upwelling phenomena. Virioplankton abundance ranged from 0.79 to 7.95 x 108.part.mL-1, whereas bacterioplankton abundance ranged from 2.6 to 13.4 x 10 7 . cell. mL -1 . Viruses distribution was evaluated in relation to their possible hosts, and viral abundance positively correlated with both bacteria (r = 0.65; p < 0.01) and chlorophyll-a (r = 0.61; p < 0.01). Additionally, a method of concentration using adsorption/elution into electronegative membrane combined to electron microscopy, revealed the presence of bacteriophages, belonging to Myoviridae and Podoviridae families. Principal component analysis showed clear evidence that there is a seasonal influence between Arraial do Cabo biotic and abiotic variables, and that the high abundance of viruses was correlated mainly with nitrogen inorganic forms (NO2- and NO3-), PO43-, chlorophyll-a and bacteria. Thus, our study indicated that viral abundance in Arraial do Cabo coastal region depends on host cell abundance, which appears to be controlled mainly by nutrient availability.