scholarly journals Primary productivity of coccoid cyanobacteria isolated from a coastal lagoon environment south of the Gulf of California.

2018 ◽  
Vol 33 (2) ◽  
pp. 45
Author(s):  
Gerardo Verdugo -Díaz ◽  
Aída Martínez -López ◽  
Bárbara González -Acosta
Keyword(s):  
Primary Productivity ◽  
Coastal Lagoon ◽  
Gulf Of California ◽  
Lagoon Environment

Productividad primaria de cianobacterias cocoides aisladas de un ambiente lagunar costero al sur del Golfo de CaliforniaRESUMEN. El objetivo de este estudio fue determinar la productividad primaria de cianobacterias cultivadas bajo diferentes fuentes nitrogenadas. Se consideraron 3 tratamientos: 1) sin fuente nitrogenada, 2) con nitrato (NO3), y 3) con amonio (NH4). Se realizaron incubaciones bajo condiciones controladas. Las densidades celulares fueron significativamente mayores en el tratamiento con nitratos. Los máximos de biovolumen (19.9 µm-3) y de contenido de carbono (5.4 pg C cel-1) se observaron en la fase estacionaria del tratamiento con amonio. La mayor concentración de clorofila a en la fase exponencial se registró en el tratamiento sin nitrógeno (1.038 mg m-3), mientras que el máximo en la fase estacionaria en el tratamiento con nitratos (0.65 mg m-3). La mayor producción primaria se registró en la fase exponencial (23.9 mg C m-3 h-1), asociada al tratamiento sin fuente nitrogenada incubado a 150 µ E m-2 s-1; en la fase estacionaria el máximo (11.6 mg C m-3 h-1) se registró en el tratamiento enriquecido con nitratos a 75 µ E m-2 s-1.

Pesticides in Water, Sediments, and Shrimp from a Coastal Lagoon off the Gulf of California

1999 ◽  
Vol 38 (9) ◽  
pp. 837-841 ◽  
Author(s):  
J.G Galindo-Reyes ◽  
V.U Fossato ◽  
C Villagrana-Lizarraga ◽  
F Dolci
Keyword(s):  
Coastal Lagoon ◽  
Gulf Of California ◽  
Pesticides In Water

Hydrographic Processes in a Tropical Coastal Lagoon on Western Bay of Bengal

2021 ◽  
Author(s):  
Rabindra Kumar Sahoo ◽  
Sourav Sil ◽  
Samiran Mandal ◽  
Subhasis Pradhan ◽  
Sanjiba Kumar Baliarsingh ◽  
...  
Keyword(s):  
Central Region ◽  
Coastal Lagoon ◽  
Bay Of Bengal ◽  
Saline Water ◽  
Western Boundary ◽  
Chilika Lagoon ◽  
Thermal Inversion ◽  
Tropical Coastal Lagoon ◽  
Lagoon Environment ◽  
Vertical Variability

Abstract In this article, hydrographic processes of a tropical coastal lagoon is studied that control inherent biological mechanisms of the lagoon environment. Realizing the interest of environmentalists over physio-chemical studies of a wetland tropical wetland system on the western boundary of the Bay of Bengal, a high-resolution intensive vertical hydrographic field campaign was carried during monsoon to uncover peculiarity in vertical hydrographic processes that was long-awaited to address many environmental issues. Vertical hydrographic profiles on spatio-temporal scale were made at nine stations in a zonal direction of the Chilika lagoon system. Results of vertical variability of salinity showed the presence of higher saline water over less saline water in the central-western region. The higher and lower water temperature in the western and eastern parts of the lagoon, respectively, indicated temperature dipole between the two regions. The encapsulation of water mass having higher temperature by the water of lower temperature at the central region resulted evolution of thermal inversion. The highest dissolved oxygen concentration was observed in the sub-surface layers of the western part of the lagoon. However, a layer of near-hypoxia occurred below 1.5 m depth in the central region. This study proposes comprehensive inter-seasonal studies to address the vertical variability of biogeochemical parameters and the fate of organic flux.

scholarly journals ESTIMACIÓN DE LA PRODUCTIVIDAD PRIMARIA EN DOS BAJOS DE LA PARTE SUR DEL GOLFO DE CALIFORNIA, MÉXICO

2008 ◽  
Vol 23 (1-2) ◽  
pp. 39
Author(s):  
G. Verdugo-Díaz ◽  
R. Cervantes Duarte ◽  
M. O. Albáñez-Lucero
Keyword(s):  
Surface Temperature ◽  
Water Column ◽  
Primary Productivity ◽  
Gulf Of California ◽  
Inorganic Nutrients ◽  
Water Transparency ◽  
Vertical Profiles ◽  
Subsurface Maximum ◽  
Natural Fluorescence ◽  
Productivity Estimation

Primary productivity estimation in two seamounts in the southern Gulf of California, México Vertical profiles of temperature and natural fluorescence from 100 m deep were made during February 2005. Water transparency was measured using Secchi’s disc, as well samples of superficial water and at maximum of fluorescence deep were collected to analyze inorganic nutrients. In “El Bajo Espiritu Santo” temperature (20 °C at surface) diminished gradually with depth, without significant stratification.Primary productivity shows superficial values close to 6 mg C m-3 h-1, recahing undetectable values at 20 m of depth. In “El Bajo Gorda” surface temperature reached 22 °C and the water column shows a thermocline between 35 m and 45 m of depth. The profiles of primary productivity presented a subsurface maximum (approximately 2 mg C m-3 h-1) associated with the thermocline.

Alternatives for reducing the environmental impact of an ammonia production plant adjacent to a coastal lagoon in the southeastern Gulf of California

2018 ◽  
Vol 200 ◽  
pp. 960-970
Author(s):  
Federico Páez-Osuna ◽  
Luis Miguel Flores-Campaña ◽  
Carlos Karam-Quiñones ◽  
Adreissa Lizette Páez-Michel ◽  
Cesar Julio Saucedo-Barrón ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Coastal Lagoon ◽  
Gulf Of California ◽  
Production Plant ◽  
Ammonia Production

Long-term monitoring of benthic foraminiferal assemblages from Asia's largest tropical coastal lagoon, Chilika, India

2018 ◽  
Vol 99 (2) ◽  
pp. 311-330
Author(s):  
Vandana Kumari Gupta ◽  
Areen Sen ◽  
Ajit K. Pattnaik ◽  
Gurdeep Rastogi ◽  
Punyasloke Bhadury
Keyword(s):  
Coastal Lagoon ◽  
Benthic Foraminifera ◽  
Taxonomic Composition ◽  
Spatial Patterning ◽  
Pattern Diversity ◽  
Significant Seasonal Variation ◽  
Lagoon Environment ◽  
Term Monitoring ◽  
High Diversity

The present study undertaken in the largest coastal lagoon of Asia, Chilika, deals with monthly monitoring of benthic foraminifera assemblages in terms of distribution pattern, diversity and variations in taxonomic composition spanning over a period of 20 months. In total, 13 species of benthic foraminifera represented by eight families were identified in the lagoon. The stations in the Southern sector of the lagoon showed relatively low foraminifera abundance yet high diversity whereas higher abundance and lower diversity were observed in stations located in the Central sector which indicates the spatial patterning of the assemblage. Live foraminifera abundance was sparse in the study area indicating the stressed nature of the lagoon environment. The dissolved nutrient concentration of bottom water reflected significant seasonal variation. The stressed nature of the lagoon is further indicated by the dominance of the genus Ammonia across the inner sectors of the lagoon, a genus known to inhabit impacted habitats. Overall these data can serve as a baseline proxy for understanding palaeontological assemblages of foraminifera in similar shallow-water settings globally.

Combined environmental stress from shrimp farm and dredging releases in a subtropical coastal lagoon (SE Gulf of California)

2016 ◽  
Vol 104 (1-2) ◽  
pp. 83-91 ◽  
Author(s):  
J.G. Cardoso-Mohedano ◽  
F. Páez-Osuna ◽  
F. Amezcua-Martínez ◽  
A.C. Ruiz-Fernández ◽  
G. Ramírez-Reséndiz ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Coastal Lagoon ◽  
Gulf Of California ◽  
Shrimp Farm

scholarly journals PRODUCTIVIDAD PRIMARIA EN LA CIENAGA GRANDE DE SANTA MARTA, COLOMBIA

2016 ◽  
Vol 19 ◽  
Author(s):  
Carlos A. Hernández J. ◽  
Klaus Gocke
Keyword(s):  
Primary Productivity ◽  
Coastal Lagoon ◽  
Mean Value ◽  
High Concentration ◽  
Water Turbidity ◽  
High Particle Concentration ◽  
High Particle ◽  
Wide Range ◽  
The Mean ◽  
The Caribbean

Between January 1987 and January 1988 the primary productivity and related parameters were studied in the Ciénaga Grande de Santa Marta. The Ciénaga is a coastal lagoon with an area of 423 km'2 and mean depth of 1.6 m, which is located at the Caribbean coast of Colombia. The salinity fluctuates seasonally within a wide range. The system is characterized by a high concentration of seston and a great primary productivity. The concentration of chlorophyll " a " ranged from 5.6to 181 ug Ii , the mean value was 59 ug I i . The concentration of proteins was within the extremes of 0.9 and 9.5 mg I"i f the mean value was 4.2 mg I ] . The gross primary productivity in the central part of the Ciénaga amounted to 1690 g C m*2 per year. Considering the temporal fluctuation in the whole system the lowest and highest values were 1.40 and 16.3 g C rrr2 per day. Highest productivity values were encountered when the salinity was low. The primary productivity is controlled by water turbidity and availability of nutrients, thus, seasonal continental waters. The photosynthetic laver ¡s restricted to less than 1.5 m due to the high particle concentration. The mean N: P relation was 4:1 which indicates that the nitrogen compounds are the limiting nutrientes. The high primary productivity sustains an important local fishery. The coastal area in the vicinity of the Ciénaga Grande is benefitted by the export of particulated and dissolved organic matter produced in excess within the coastal lagoon.

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