Journal of Marine and Coastal Sciences <div id="journalDescription"> <p><strong>WELCOME</strong><br><br><strong>REVISTA CIENCIAS MARINAS Y COSTERAS (<em>REVMAR</em>)</strong><br><br></p> <p>The purpose of this journal is to publish original papers related to marine science, including biology, geology and marine ecology, oceanography, evolution, systematics and taxonomy of marine organisms, pollution, fisheries, mariculture, marine biotechnology, conservation and integrated management of coastal and marine resources.</p> </div> Universidad Nacional, Costa Rica. en-US Journal of Marine and Coastal Sciences 1659-455X <p>Desde el Volumen 1, Año 2009 hasta el Volumen 8, Número 1, Año 2016</p> <p><a href="" rel="license"><img style="border-width: 0;" src="" alt="Licencia de Creative Commons"></a><br><a href="/revmar%20">Revista Ciencias Marinas y Costeras</a> se encuentra bajo una <a href="" rel="license">licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 3.0 Costa Rica</a>.</p> <p>&nbsp;</p> <p>A partir del Volumen 8, Número 2, Año 2016</p> <p><img style="border-width: 0;" src="" alt="Creative Commons License"></p> <p><a href="/index.php/revmar">Revista Ciencias Marinas y Costeras</a> se encuentra bajo una <a href="">Licencia Creative Commons Atribución-NoComercial-CompartirIgual 4.0 Internacional</a>.</p> Characterization of culturable bacteria isolated from mesophotic reef sites in Cuba <p>The bacterial communities of mesophotic reef sites constitute genetic information of interest due to the particular conditions of temperature, pressure, salinity and availability of organic matter and nutrients in the environment in which they develop. The present work aimed to evaluate the bacterial diversity in waters surrounding the mesophotic reefs of Cuba during the period May-June 2017; as well as some of its biotechnological potentialities. Bacterial cultures were isolated on marine agar medium for two water column depth levels at 10 sampling sites.&nbsp; Subsequently, the metabolic capacities of the isolates were evaluated and related to the assimilation of different carbon sources and the production of bioactive metabolites.&nbsp; The results allowed the characterization of 30 bacterial cultures from subsurface-level and 32 from deep-sea waters.&nbsp; The highest percentage corresponds to Gram positive (G+) sporulated bacilli and Gram negative (G-) bacilli.&nbsp; Likewise, it was shown that 85.5% of the isolates degrade carbohydrates of different nature and 96.8% produce hydrolytic enzymes with caseinase, gelatinase, lipase or amylase activity.&nbsp; The ability to degrade petroleum oil and phenolic compounds indistinctly was detected in 61.3% of the isolates.&nbsp; Among the potentialities of biomedical and industrial interest, surfactant and L-asparaginase activity was detected in 53% and 32% of the cultures, respectively.&nbsp; For its part, the taxonomic characterization of 40 cultures selected for their metabolic potentials showed that the genus <em>Bacillus</em> presented greater biological activity.&nbsp; These results constitute the first approach to the characterization of bacterial diversity in mesophotic reef sites of Cuba.</p> Eudalys Ortiz-Guilarte María Victoria Iglesias-Rodríguez Roberto Rafael Núñez-Moreira Valia Caballero Barreto Daymarlen González-Tamayo Gladys Margarita Lugioyo-Gallardo ##submission.copyrightStatement## 2021-04-23 2021-04-23 9 26 10.15359/revmar.13-1.1 Effect of metal concentration on growth and luminescence of luminous bacteria strains isolated from golfo de Nicoya, Costa Rica <p>Luminescence in bacteria is catalyzed by luciferase. When these microorganisms are exposed to toxic substances, the bioluminescent enzyme system can be inhibited. The objective of this study was to analyze the potential that these microorganisms offer as native bioindicators of coastal marine pollution. The dynamics of luminescence intensity by visual classification and the effect of metal concentration on the growth and luminescence of 25 strains of luminescent bacteria, isolated during 2016 from seawater samples from the gulf of Nicoya, Costa Rica, was evaluated by the disk diffusion method. The sensitivity of each strain to different concentrations (0.1, 0.5 and 1 mg mL<sup>-1</sup>) of Cd, Cu, Cr, Pb and Zn was determined by its bioluminescent phenotype. In susceptible strains, a range of metal concentrations less than the growth inhibitory concentration affected the expression of luminescence. Strains with intense luminescence and defined zones of luminescence inhibition were considered to have greater potential as native bioindicators for monitoring environmental toxicity. More studies are required to determine the minimum concentrations that inhibit growth and luminescence with respect to the tested metals and other potentially toxic substances for the coastal marine ecosystems of Costa Rica.</p> Luis Vega-Corrales Carolina Marín-Vindas ##submission.copyrightStatement## 2021-04-23 2021-04-23 27 38 10.15359/revmar.13-1.2