scholarly journals Potentially harmful cyanobacteria in oyster banks of Términos lagoon, southeastern Gulf of Mexico

2018 ◽  
Vol 23 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Carlos Antonio Poot-Delgado ◽  
Yuri B. Okolodkov ◽  
Jose Antolin Aké-Castillo ◽  
Jaime Rendón von Osten
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Terminos Lagoon ◽  
Harmful Cyanobacteria ◽  
Anabaena Sp ◽  
Laguna De Terminos

Las cianobacterias habitan en ambientes hipersalinos, marinos y de agua dulce. Algunas especies tóxicas y no tóxicas pueden formar florecimientos nocivos. El objetivo de este estudio fue identificar las especies de cianobacterias potencialmente nocivas en los bancos ostrícolas de laguna de Términos, sureste del Golfo de México. Seis sitios de muestreo (hasta 2 m de profundidad) fueron monitoreados mensualmente de agosto de 2012 a septiembre de 2013. Se midió la temperatura del agua, salinidad, pH, saturación de oxígeno, nutrientes inorgánicos y abundancia de cianobacterias. La temperatura y la salinidad se caracterizaron por marcadas diferencias estacionales (26,8 a 30,6 °C y 6,1 a 19,5, respectivamente). Los valores de pH (de 7,1 a 8,4) y la saturación de oxígeno disuelto (de 88,4 a 118,2 %) sugieren un predominio de la actividad fotosintética en la temporada de nortes (octubre-enero). Las concentraciones elevadas de los nutrientes están asociados al periodo de mayor descarga de los ríos, determinados por la circulación y los procesos biogeoquímicos. Se identificaron 14 taxa, de los cuales Anabaena sp., Merismopedia sp., Oscillatoria sp. y Cylindrospermopsis cuspis formaron florecimientos. Las abundancias de cianobacterias fueron del orden de magnitud de 106 células L-1 en octubre de 2012 en las estaciones S1-S6, con un valor promedio de 3.2x105 células L-1 y un rango de 2000 a 3.1x106 células L-1 a lo largo del periodo de estudio. Sin embargo, mostraron una ausencia notable durante la temporada de nortes (octubre a enero). Anabaena sp. y C. cuspis alcanzaron abundancias de 1.9x106 y 1.3x106 células L-1, respectivamente. Este último causó el cierre temporal de la colecta del ostión Crassostrea virginica durante 15 días en octubre de 2012.

Phages Infecting Vibrio vulnificus Are Abundant and Diverse in Oysters (Crassostrea virginica) Collected from the Gulf of Mexico

1998 ◽  
Vol 64 (1) ◽  
pp. 346-351 ◽  
Author(s):  
Angelo DePaola ◽  
Miles L. Motes ◽  
Amy M. Chan ◽  
Curtis A. Suttle
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Vibrio Vulnificus ◽  
Gulf Coast ◽  
Morphological Evidence ◽  
Broad Host Range ◽  
Oyster Tissue ◽  
Mobile Bay ◽  
Apalachicola Bay ◽  
Transmission Electron

ABSTRACT Phages infecting Vibrio vulnificus were abundant (>104 phages g of oyster tissue−1) throughout the year in oysters (Crassostrea virginica) collected from estuaries adjacent to the Gulf of Mexico (Apalachicola Bay, Fla.; Mobile Bay, Ala.; and Black Bay, La.). Estimates of abundance ranged from 101 to 105 phages g of oyster tissue−1 and were dependent on the bacterial strain used to assay the sample. V. vulnificus was near or below detection limits (<0.3 cell g−1) from January through March and was most abundant (103 to 104 cells g−1) during the summer and fall, when phage abundances also tended to be greatest. The phages isolated were specific to strains of V. vulnificus, except for one isolate that caused lysis in a few strains of V. parahaemolyticus. Based on morphological evidence obtained by transmission electron microscopy, the isolates belonged to the Podoviridae,Styloviridae, and Myoviridae, three families of double-stranded DNA phages. One newly described morphotype belonging to the Podoviridae appears to be ubiquitous in Gulf Coast oysters. Isolates of this morphotype have an elongated capsid (mean, 258 nm; standard deviation, 4 nm; n = 35), with some isolates having a relatively broad host range among strains of V. vulnificus. Results from this study indicate that a morphologically diverse group of phages which infect V. vulnificus is abundant and widely distributed in oysters from estuaries bordering the northeastern Gulf of Mexico.

Crassostrea virginica glutathione S-transferase activity as biomarker of environmental contamination in terminos lagoon, Campeche, Mexico

2006 ◽  
Vol 164 ◽  
pp. S160
Author(s):  
Jaime Rendón-von Osten ◽  
Alejandro Ortiz Arana ◽  
Martin Memije-Canepa ◽  
Guillermo Villalobos ◽  
Jorge Benítez
Keyword(s):  
Crassostrea Virginica ◽  
Environmental Contamination ◽  
Transferase Activity ◽  
Glutathione S Transferase ◽  
Terminos Lagoon

scholarly journals Biogeochemical cycling and phyto- and bacterioplankton communities in a large and shallow tropical lagoon (Términos Lagoon, Mexico) under 2009–2010 El Niño Modoki drought conditions

2017 ◽  
Vol 14 (4) ◽  
pp. 959-975 ◽  
Author(s):  
Pascal Conan ◽  
Mireille Pujo-Pay ◽  
Marina Agab ◽  
Laura Calva-Benítez ◽  
Sandrine Chifflet ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Gulf Of Mexico ◽  
El Niño ◽  
El Nino ◽  
Organic Phosphorus ◽  
Phytoplankton Productivity ◽  
El Niño Modoki ◽  
Terminos Lagoon ◽  
Bacterioplankton Communities

Abstract. The 2009–2010 period was marked by an episode of intense drought known as the El Niño Modoki event. Sampling of the Términos Lagoon (Mexico) was carried out in November 2009 in order to understand the influence of these particular environmental conditions on organic matter fluxes within the lagoon's pelagic ecosystem and, more specifically, on the relationship between phyto- and bacterioplankton communities. The measurements presented here concern biogeochemical parameters (nutrients, dissolved and particulate organic matter [POM], and dissolved polycyclic aromatic hydrocarbons [PAHs]), phytoplankton (biomass and photosynthesis), and bacteria (diversity and abundance, including PAH degradation bacteria and ectoenzymatic activities). During the studied period, the water column of the Términos Lagoon functioned globally as a sink and, more precisely, as a nitrogen assimilator. This was due to the high production of particulate and dissolved organic matter (DOM), even though exportation of autochthonous matter to the Gulf of Mexico was weak. We found that bottom-up control accounted for a large portion of the variability of phytoplankton productivity. Nitrogen and phosphorus stoichiometry mostly accounted for the heterogeneity in phytoplankton and free-living prokaryote distribution in the lagoon. In the eastern part, we found a clear decoupling between areas enriched in dissolved inorganic nitrogen near the Puerto Real coastal inlet and areas enriched in phosphate (PO4) near the Candelaria estuary. Such a decoupling limited the potential for primary production, resulting in an accumulation of dissolved organic carbon and nitrogen (DOC and DON, respectively) near the river mouths. In the western part of the lagoon, maximal phytoplankton development resulted from bacterial activity transforming particulate organic phosphorus (PP) and dissolved organic phosphorus (DOP) to available PO4 and the coupling between Palizada River inputs of nitrate (NO3) and PP. The Chumpan River contributed only marginally to PO4 inputs due to its very low contribution to overall river inputs. The highest dissolved total PAH concentrations were measured in the El Carmen Inlet, suggesting that the anthropogenic pollution of the zone is probably related to the oil-platform exploitation activities in the shallow waters of the southern of the Gulf of Mexico. We also found that a complex array of biogeochemical and phytoplanktonic parameters were the driving force behind the geographical distribution of bacterial community structure and activities. Finally, we showed that nutrients brought by the Palizada River supported an abundant bacterial community of PAH degraders, which are of significance in this important oil-production zone.

scholarly journals Lindane and Endosulfan Sulfate Isomers in Crassostrea virginica Oyster Populations (Gmelin, 1791) in Lagoon Systems from Central Gulf of Mexico

2017 ◽  
Vol 2 (4) ◽  
pp. 1579-1585
Author(s):  
Ruth Patricia Aragon-Lopez ◽  
Maria del Refugio Castaneda-Chavez ◽  
Alejandro Granados Barba ◽  
David Salas Monreal ◽  
Cesareo Landeros Sanchez
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Endosulfan Sulfate ◽  
Lagoon Systems

scholarly journals Varamientos de toninas, Tursiops truncatus, en Laguna de Términos y zonas adyacentes, 2002-2013 / Strandings of bottlenose dolphins, Tursiops Truncatus, in Terminos Lagoon and adjacent areas, 2002-2013

2014 ◽  
Vol 3 (6) ◽  
pp. 40
Author(s):  
G Rivas Hernández ◽  
R Barreto Castro ◽  
A Delgado Estrella
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Terminos Lagoon ◽  
Laguna De Terminos

En el área de Laguna de Términos se han registrado un total de 115 varamientos de toninas muertas de 2002 a 2013. El mayor número de varamientos ocurrió en 2006 (n= 19), mientras que el menor número se registró en 2007 y 2011 (n= 3); la mayor frecuencia fue en mayo (n= 23 registros) y en diciembre se registraron solamente dos animales varados. El mayor número de varamientos ocurrió en la temporada de secas (n=53, 46 %), seguido de la temporada de lluvias (n=42, 37%) y la de nortes (n=20, 17 %). Del total de 115 ejemplares de Tursiops truncatus varados, 72 fueron machos (62.6 %), 19 fueron hembras (16.52 %) y a 24 organismos no se les pudo determinar el sexo (20.88 %); ocho organismos fueron crías varadas (7 %), de las cuales tres fueron crías recién nacidas. Se registraron con mayor frecuencia organismos de tamaño de entre 191-200 cm y 231-240 (n=11, para cada intervalo). En este estudio se registraron toninas correspondientes a las formas costera y oceánica.

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