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

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

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.

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

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.

scholarly journals Linking Habitat and Associated Abiotic Conditions to Predict Fish Hotspots Distribution Areas within La Paz Bay: Evaluating Marine Conservation Areas

Diversity ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 212
Author(s):  
Francisco Javier Urcádiz-Cázares ◽  
Víctor Hugo Cruz-Escalona ◽  
Mark S. Peterson ◽  
Rosalía Aguilar-Medrano ◽  
Emigdio Marín-Enríquez ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Management Plan ◽  
Marine Conservation ◽  
Fish Diversity ◽  
Rocky Shores ◽  
Conservation Areas ◽  
Niche Modelling ◽  
La Paz ◽  
Abiotic Conditions ◽  
Presence Data

Hotspots are priority marine or terrestrial areas with high biodiversity where delineation is essential for conservation, but equally important is their linkage to the environmental policies of the overall region. In this study, fish diversity presences were linked to abiotic conditions and different habitat types to reveal multi-species and hotspots models predicted by ecological niche modelling methods within the Bay of La Paz, Mexico (south of Gulf of California). The abiotically suitable areas for 217 fish species were identified based on historical (1975–2020) presence data sets and a set of environmental layers related to distances from mangroves and rocky shores habitats, marine substrate, and bottom geomorphology conditions. Hotspot model distribution was delineated from a multi-species model identifying areas with ≥60 species per hectare and was compared to the marine conservation areas such Balandra Protected Natural Area (BPNA), illustrating how these models can be applied to improve the local regulatory framework. The results indicate that (1) there is a need for the BPNA to be enlarged to capture more of the delineated hotspot areas, and thus an update to the management plan will be required, (2) new conservation areas either adjacent or outside of the established BPNA should be established, or (3) Ramsar sites or other priority areas should be subject to legal recognition and a management plan decreed so that these vital habitats and fish diversity can be better protected.

scholarly journals A MULTI-SPECIES MICROALGAE BLOOM IN BAHIA DE LA PAZ, GULF OF CALIFORNIA, MEXICO (JUNE 2008)

2009 ◽  
Vol 24 (1) ◽  
pp. 15 ◽  
Author(s):  
I. Gárate-Lizárraga ◽  
C. J. Band-Schmidt ◽  
F. Aguirre-Bahena ◽  
T. Grayeb del Alamo
Keyword(s):  
Phytoplankton Biomass ◽  
Gulf Of California ◽  
Phytoplankton Community ◽  
Red Tide ◽  
Total Density ◽  
La Paz ◽  
Gyrodinium Instriatum ◽  
High Species Richness ◽  
Myrionecta Rubra ◽  
Ecological Importance

Red tide patches were observed in Bahía de La Paz in June 17 and 18 of 2008. According to temperature and wind data this bloom occurred under upwelling-like conditions. Examination of the red tide samples showed the ciliate Myrionecta rubra and the naked dinoflagellates Gyrodinium instriatum and Katodinium glaucum as the main species responsible for this bloom. Total density (microalgae and ciliate) at the sampling stations was similar on both days, varying from 4607 × 103 cells L-1 to 4976 × 103 cells L-1 on the first day, and from 4172 × 103 cells L-1 to 5024 × 103 cells L-1 on the second day. Phytoplankton biomass (chlorophyll a) observed during the first day of the bloom was 1.5 mg m-3. Dinoflagellates and diatoms were the most numerically important phytoplankton groups. The phytoplankton community showed a high species richness, particularly heterotrophic dinoflagellates and ebridians. The ecological importance of the heterotrophic component of naked dinoflagellates and the ebriids for this bay is discussed. Florecimiento multiespecífico de microalgas en la Bahía de La Paz, Golfo de California, México (Junio, 2008) Durante los días 17 y 18 de junio de 2008, se observó una marea roja en la Bahía de La Paz. De acuerdo con los datos de temperatura y de vientos, este florecimiento ocurrió bajo condiciones muy similares a las de una surgencia. El examen de las muestras de marea roja revelaron que el ciliado Myrionecta rubra y los dinoflagelados desnudos Gyrodinium instriatum y Katodinium glaucum fueron las principales especies responsables de esta proliferación. La densidad total (microalgas y ciliado) fue similar en ambos días, variando de 4607 × 103 céls L-1 a 4976 × 103 céls L-1 durante el primero y entre 4172 × 103 céls L-1 y 5024 × 103 céls L-1 el segundo día, respectivamente. La biomasa fitoplanctónica (clorofila a) medida durante el primer día del florecimiento fue de 1.5 mg m3. Los dinoflagelados y las diatomeas fueron los dos grupos del fitoplancton numéricamente más importantes. Se observó una comunidad fitoplanctónica con una alta riqueza de especies, particularmente de dinoflagelados y ebriidos heterotróficos. Se discute la importancia del componente heterotrófico de los dinoflagelados desnudos y ebriidos.

scholarly journals Bio-optical characterization of the waters of the Bay of La Paz, southern Gulf of California, during late spring 2004

2020 ◽  
Vol 54 (3) ◽  
pp. 343
Author(s):  
Erik Coria-Monter ◽  
María Adela Monreal-Gómez ◽  
David Alberto Salas de León ◽  
Elizabeth Durán-Campos
Keyword(s):  
Primary Production ◽  
Gulf Of California ◽  
Net Primary Production ◽  
Light Extinction ◽  
La Paz ◽  
Light Extinction Coefficient ◽  
Production Values ◽  
Subsequent Calculation ◽  
Natural Fluorescence ◽  
Community Growth

Information on selected bio-optical properties and primary production values of the waters of the Bay of La Paz, southern Gulf of California, is reported during June 2004, a region characterized to have very rich biodiversity, including endemic and endangered species, with high ecological relevance. In-situ measurements of natural fluorescence and photosynthetically available radiation (PAR) enabled the subsequent calculation of the incident irradiance (E0), the light extinction coefficient (k), compensation depth (Zc) and critical depth (Zcr). The results suggest the presence of light propitious conditions for phytoplankton community growth and net primary production, which are highly significant for the potential development of models of light penetration, ocean color, primary productivity, and analyses of organic carbon energy flow.

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