scholarly journals Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico

2020 ◽  
Author(s):  
Franco Antonio Rocha Díaz ◽  
María Adela Monreal Gómez ◽  
Erik Coria Monter ◽  
David Alberto Salas de León ◽  
Elizabeth Durán Campos
Keyword(s):  
Water Column ◽  
Chlorophyll A ◽  
Gulf Of California ◽  
Feeding Habits ◽  
Mesoscale Eddy ◽  
Circulation Pattern ◽  
Cyclonic Eddy ◽  
La Paz ◽  
The Impact ◽  
Copepod Biomass

AbstractAs one of the main groups composing marine zooplankton, copepods play an important role due to the position they occupy in the trophic web. Study of their biomass and relationship with the physical conditions of the water column are essential in order to evaluate the trophic structure and functions of any aquatic ecosystem. As a contribution to this topic, we assessed the copepod biomass inside a cyclonic eddy system during two different seasons in the Bay of La Paz in the southern Gulf of California, a region characterized by high biological productivity. Two oceanographic expeditions took place in the winter of 2006 and summer of 2009 on which a conductivity-temperature-depth (CTD) probe was used to determine the physical structure of the water column and oblique zooplankton hauls collected zooplankton samples. Satellite data were used to visualize chlorophyll-a distribution patterns. The results showed the presence of a well-defined mesoscale cyclonic eddy in both seasons, with high chlorophyll-a (CHLA) values at the edges of the eddy. Maximum values for copepod biomass were observed in winter and their distribution corresponded well with the circulation pattern and the CHLA values, forming a belt shape following the periphery of the eddy. The results presented herein highlight the impact of the mesoscale eddy on the planktonic ecosystem through its influence on hydrographic conditions in the water column. Other factors, such as ecological interactions, population dynamics, and feeding habits may play a role as well. Feeding behavior in particular is affected by high CHLA concentrations observed around the eddy which represent a source of food for these organisms.

Impact of a Mesoscale Cyclonic Eddy on the Phytoplankton Biomass of Bay of La Paz in the Southern Gulf of California

2021 ◽  
Vol 74 (4) ◽  
Author(s):  
Joselyn Midori Sánchez-Mejía ◽  
María Adela Monreal-Gómez ◽  
Elizabeth Durán-Campos ◽  
David Alberto Salas De León ◽  
Erik Coria-Monter ◽  
...  
Keyword(s):  
Phytoplankton Biomass ◽  
Gulf Of California ◽  
Cyclonic Eddy ◽  
La Paz

scholarly journals Chlorophyll-a vertical distribution patterns during summer in the Bay of La Paz, Gulf of California, Mexico

2019 ◽  
Vol 45 (2) ◽  
pp. 109-115
Author(s):  
Elizabeth Durán-Campos ◽  
María Adela Monreal-Gómez ◽  
David Alberto Salas de León ◽  
Erik Coria-Monter
Keyword(s):  
Vertical Distribution ◽  
Chlorophyll A ◽  
Gulf Of California ◽  
Distribution Patterns ◽  
La Paz

The impact of hurricanes on sedimenting particulate matter in the semi-arid Bahía de La Paz, Gulf of California

2007 ◽  
Vol 27 (19) ◽  
pp. 2513-2522 ◽  
Author(s):  
Norman Silverberg ◽  
Evgueni Shumilin ◽  
Fernando Aguirre-Bahena ◽  
Ana Patricia Rodríguez-Castañeda ◽  
Dmitry Sapozhnikov
Keyword(s):  
Particulate Matter ◽  
Gulf Of California ◽  
La Paz ◽  
The Impact ◽  
Semi Arid

scholarly journals ESTIMACIÓN DE LA PRODUCTIVIDAD PRIMARIA DURANTE OTOÑO-INVIERNO EN LA BAHÍA DE LA PAZ, B.C.S., MÉXICO

2008 ◽  
Vol 23 (1-2) ◽  
pp. 45
Author(s):  
G. Verdugo-Díaz ◽  
M. O. Albáñez-Lucero ◽  
R. Cervantes Duarte
Keyword(s):  
Chlorophyll A ◽  
Primary Productivity ◽  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Cold Season ◽  
Maximum Temperature ◽  
La Paz ◽  
Average Maximum ◽  
Average Maximum Temperature

Se analizó la variabilidad de la productividad primaria en Bahía de La Paz, durante noviembre de 1997 y 2000, enero de 1998 y febrero de 2001. Se identificó Agua del Golfo de California en mayor proporción; Agua Superficial Ecuatorial y Agua Subsuperficial Subtropical. En noviembre de 1997 se registró el valor promedio máximo de temperatura (~27.62 °C) y en febrero el valor mínimo (~19.16 °C). El índice de Simpson (Ö) indicó que durante noviembre de 1997 (~286.6 J m-3) la columna de agua presentó mayor estratificación, mientras que en noviembre de 1998 (~60.4 J m-3) y febrero de 2001 (~94.5 J m-3) se encontró mezclada. En noviembre de 1997 se registraron bajos valores de nitratos (~1.52 µM), nitritos (~0.04 µM) y clorofila a (~0.44 mg Cla m-3). En febrero de 2001 se registraron valores mayores de nitratos (~7.46 µM), nitritos (~0.76 µM) y clorofila a (~1.07 mg Cla m-3). La productividad primaria superficial e integrada presentaron sus promedios máximos en noviembre de 2000 (~5.09 mg C m-3 h-1 y 75.54. mg m-2 h-1) y mínimos en noviembre de 1997 (~2.93 mg C m-3 h-1 y ~55.29 mg m-2 h-1), respectivamente. De acuerdo a investigaciones anteriores, los valores reportados de productividad son característicos de la temporada fría de la bahía con excepción de noviembre de 1997, que presentó influencia de El Niño. Primary productivity stimation during autumm-winter in Bahía de La Paz, B.C.S., Mexico We analyzed the variability of primary productivity in Bahía de La Paz during November 1997 and 2000, January 1998 and February 2001. Water was identified in the Gulf of California in higher proportion; Surface Water and Water Subsuperficial Equatorial Subtropical. In November 1997 we saw the average maximum temperature (~ 27.62 ° C) in February and the lowest value (~ 19.16 ° C). The index of Simpson (Ö) indicated that during November 1997 (~ 286.6 J-3 m) column of water with greater stratification, while in November 1998 (~ 60.4 m J-3) and February 2001 (~ 94.5 J m-3) was mixed. In November 1997 there were low values of nitrate (~ 1.52 µM), nitrites (~ 0.04 µM) and chlorophyll a (Cla ~ 0.44 mg m-3). In February 2001, there were larger values of nitrate (~ 7.46 µM), nitrites (~ 0.76 µM) and chlorophyll a (Cla ~ 1.07 mg m-3). The primary productivity and integrated surface presented their highest averages in November 2000 (C ~ 5.09 mg m-3 h-1 and 75.54. mg m-2 h-1) and minimum in November 1997 (C ~ 2.93 mg m-3 h-1 and ~ 55.29 mg m-2 h-1), respectively. According to previous research, reported productivity values are characteristic of the cold season of the bay with exception of November 1997, which showed influence of El Niño.

The impact of hurricanes on sedimenting particulate matter in the semi-arid Bahía de La Paz, Gulf of California

2008 ◽  
Vol 28 (8) ◽  
pp. 1089-1090 ◽  
Author(s):  
N. Silverberg ◽  
E. Shumilin ◽  
F. Aguirre-Bahena ◽  
A.P. Rodríguez-Castañeda ◽  
D. Sapozhnikov
Keyword(s):  
Particulate Matter ◽  
Gulf Of California ◽  
La Paz ◽  
The Impact ◽  
Semi Arid

scholarly journals ESTADIOS DE VIDA DE Gyrodinium falcatum (DINOPHYCEAE) EN LA BAHÍA DE LA PAZ, GOLFO DE CALIFORNIA

2010 ◽  
Vol 25 (1) ◽  
pp. 53
Author(s):  
I. Gárate-Lizárraga ◽  
R. E. Muciño-Márquez ◽  
D. J. López-Cortés
Keyword(s):  
Water Column ◽  
Gulf Of California ◽  
Life Stages ◽  
Stages Of Development ◽  
La Paz ◽  
Spring Period ◽  
Field Samples

Se observaron cinco estados de desarrollo del dinoflagelado Gyrodinium falcatum en muestras de Bahía de La Paz. Aunque esta especie fue observada a lo largo del año, fue más abundante durante el periodo de inviero a primavera, cuando la columna de agua es homogénea. G. falcatum fue observada como epifita de la diatomea Chaetoceros coarctatus. Life stages of Gyrodinium falcatum (Dinophyceae) in Bahía de La Paz, Gulf of California Five stages of development of the dinoflagellate Gyrodinium falcatum were observed in field samples from Bahía de La Paz. Although this species was observed throughout the year, it was more abundant in the winter-spring period when the water column is homogeneous. G. falcatum was observed as epiphyte on the diatom Chaetoceros coarctatus.

Wind driven nutrient and subsurface chlorophyll-a enhancement in the Bay of La Paz, Gulf of California

2017 ◽  
Vol 196 ◽  
pp. 290-300 ◽  
Author(s):  
Erik Coria-Monter ◽  
María Adela Monreal-Gómez ◽  
David Alberto Salas de León ◽  
Elizabeth Durán-Campos ◽  
Martín Merino-Ibarra
Keyword(s):  
Chlorophyll A ◽  
Gulf Of California ◽  
La Paz

Variations in BOD, algal biomass and organic matter biodegradation constants in a wind-mixed tropical facultative waste stabilization pond

2005 ◽  
Vol 51 (12) ◽  
pp. 183-190 ◽  
Author(s):  
C.G.R. Meneses ◽  
L.B. Saraiva ◽  
H.N. de S. Melo ◽  
J.L.S. de Melo ◽  
H.W. Pearson
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Chlorophyll A ◽  
K Value ◽  
Wind Speeds ◽  
Waste Stabilization ◽  
The Mean ◽  
Wind Mixing ◽  
The Impact ◽  
Bod Removal

This study considered the impact of wind mixing on the efficiency of BOD removal and the first order biodegradation constant for organic matter in a primary facultative pond. Wind speeds of 1–4 m/s blowing from the effluent end of the pond towards the influent created surface-water flows of up to 0.94 m/s as determined by orange and coconut drogues moving in the opposite direction to the bulk hydraulic flow of 0.217 m/s. This was sufficient to cause mixing of the water column resulting in loss of stratification in terms of chlorophyll a, temperature and dissolved oxygen. BOD and chlorophyll a concentrations were spatially and temporally homogeneous throughout this large pond. BOD removal efficiency was only 50.3% as opposed to a projected value of 79% despite an acceptable surface organic loading of 350 kgBOD5/ha/d and an actual k value for BOD removal using influent sewage samples of 0.29 d−1 close to the projected value of 0.30 d−1. It would seem that wind mixing reduced pond efficiency by destroying stratification and thus reducing the microbial activity necessary to consume organic material. Mixing also increased the mean chlorophyll a concentration compared to stratified facultative ponds receiving similar loads and non-motile algae dominated the water column.

scholarly journals Vertical distribution of calanoid copepods in a mature cyclonic eddy in the Gulf of California

Crustaceana ◽  
2018 ◽  
Vol 91 (1) ◽  
pp. 63-84 ◽  
Author(s):  
Javier Cruz-Hernández ◽  
Laura Sánchez-Velasco ◽  
Victor M. Godínez ◽  
Emilio Beier ◽  
José R. Palomares-García ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Mixed Layer ◽  
Gulf Of California ◽  
Calanoid Copepod ◽  
Cyclonic Eddy ◽  
Surface Mixed Layer ◽  
Calanoid Copepods ◽  
Mature Phase ◽  
Water Column Stratification

The distribution of calanoid copepod habitats in a cyclonic eddy in the Gulf of California was examined. Direct velocity observations revealed that the eddy extended to approximately 550 m depth and 150 km diameter. The established thermocline suggested that active vertical pumping was not occurring because the eddy was in mature phase. A copepod habitat located in the surface mixed layer, showed high abundances, dominated by Subeucalanus subtenuis (Giesbrecht, 1888), whose abundances decrease towards the centre of the eddy. A second habitat, situated in thermocline, had the highest abundances dominated by Nannocalanus minor (Claus, 1863) and Temora discaudata Giesbrecht, 1889. Another habitat, beneath the thermocline, was dominated by most of species recorded in thermocline, but with the lowest abundance. Results suggest that in the mature phase of a cyclonic eddy, the water column stratification induces layering of the calanoid copepod habitats, with the most propitious conditions for their feeding in thermocline.

scholarly journals Field and satellite observations on the seasonal variability of the surface chlorophyll-a in the Bay of La Paz, Gulf of California, Mexico

2020 ◽  
Vol 14 (1) ◽  
pp. 157 ◽  
Author(s):  
Elizabeth Durán-Campos ◽  
María Adela Monreal-Gómez ◽  
David Alberto Salas de León ◽  
Erik Coria-Monter
Keyword(s):  
Chlorophyll A ◽  
Seasonal Variability ◽  
Gulf Of California ◽  
Satellite Observations ◽  
La Paz
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