The increased bacterial resistance to antibiotics has caused global concern, prompting the search... more The increased bacterial resistance to antibiotics has caused global concern, prompting the search for new compounds. Because of their abundance and diversity, marine phytoplankton are an important potential source of such compounds. Research on dinoflagellates has led to the discovery of inhibitors of bacterial growth. The marine dinoflagellate Lingulodinium polyedrum blooms in different regions of the world, including Mexico, and is also known to regulate the growth of other species in coastal waters. Here, we investigate the taxonomy of this dinoflagellate and characterize the ability of its extracts to inhibit the growth of two bacteria of medical importance (Vibrio vulnificus and Staphylococcus aureus) on agar culture plates. Taxonomic characterization was performed by PCR and gene amplification of ITS, and confirmed that the species isolated off the Pacific coast of Mexico was L. polyedrum. To prove the inhibitory effect of L. polyedrum extracts, cultures were harvested by cent...
In this study, morphological characters were used to describe the diversity and seasonal variabil... more In this study, morphological characters were used to describe the diversity and seasonal variability of the genus Pseudo-nitzschia in a coastal region of the Mexican tropical Pacific Ocean. Eleven species were characterized from cultures and field material: Pseudo-nitzschia americana, Pseudo-nitzschia australis, Pseudo-nitzschia brasiliana, Pseudo-nitzschia delicatissima, Pseudo-nitzschia cf. delicatissima, Pseudo-nitzschia dolorosa, Pseudo-nitzschia cf. fryxelliana, Pseudo-nitzschia micropora, Pseudo-nitzschia multistriata, Pseudo-nitzschia pungens var. aveirensis, and Pseudo-nitzschia subfraudulenta. The maximum diversity and abundance occurred in spring, in parallel with a local upwelling, whereas fewer species were detected in autumn. Among those analyzed, the only species to be detected throughout the year at several stations was P. cf. fryxelliana, whereas the rarest species in the study area was P. americana, which was detected only in the spring.
How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative
The increased bacterial resistance to antibiotics has caused global concern, prompting the search... more The increased bacterial resistance to antibiotics has caused global concern, prompting the search for new compounds. Because of their abundance and diversity, marine phytoplankton are an important potential source of such compounds. Research on dinoflagellates has led to the discovery of inhibitors of bacterial growth. The marine dinoflagellate Lingulodinium polyedrum blooms in different regions of the world, including Mexico, and is also known to regulate the growth of other species in coastal waters. Here, we investigated the taxonomy of this dinoflagellate and characterized the ability of its extracts to inhibit the growth of two bacteria of medical importance (Vibrio vulnificus and Staphylococcus aureus). Taxonomic characterization was performed by PCR and gene amplification of ITS, and confirmed that the species isolated off the Pacific coast of Mexico was L. polyedrum. To prove the inhibitory effect of L. polyedrum extracts, cultures were harvested by centrifuga-tion. Pellets ...
Hidrobiológica: [revista del Departamento de Hidrobiología]
espacialmente explícito de la migración estacional del pez (Istiophorus platypterus) vela en el P... more espacialmente explícito de la migración estacional del pez (Istiophorus platypterus) vela en el Pacífico mexicano. Hidrobiológica 21(2): 126-134. RESUMEN Utilizando los datos de captura y esfuerzo registrados en la pesca deportiva realizada en los puertos de Mazatlán,
Resumen Durante febrero de 2007, sobre diez estaciones situadas en la Laguna de Cuyutlán, Colima ... more Resumen Durante febrero de 2007, sobre diez estaciones situadas en la Laguna de Cuyutlán, Colima se extrajeron muestras de sedimento (por triplicado). La profundidad de cada núcleo varió entre 15 y 25 cm, cada uno fue seccionado de la superficie hacia el fondo y a cada segmento se le cuantificó la concentración de carbono orgánico (C-org) y nitrógeno total (N-tot) como indicadores de la presencia de procesos diagéneticos. En toda el área de estudio la textura se caracterizó por estar compuesta principalmente por Limos y Arcillas, sin embargo cinco testigos presentaron una textura más heterogénea asociada a su cercanía con la barra arenosa y a sitios con mayor dinámica en la columna de agua. Las muestras limo-arcillosas presentaron mayores concentraciones de C-org y N-tot que aquellas más arenosas. En cuanto a la distribución vertical del C-org y del N-tot en cinco estaciones su concentración fue relativamente homogénea, en el resto presentó disminuciones del tipo exponencial caracte...
In order to reconstruct the paleoceanography in the Gulf of California, a Reineck core was obtain... more In order to reconstruct the paleoceanography in the Gulf of California, a Reineck core was obtained at 670 m water depth from Carmen Basin (Latitude 25°53,311' N; Longitude 110°52,267' W). Core C53B consists of 26 cm length and 25 samples were observed under the cross-polarizing light microscope (1000x), counting 300 coccoliths per slide (Fatela and Taborda, 2002). Preparation of samples was made using the decantation technique described by Flores and Sierro (1977). The coccolithophore assemblage was dominated by Gephyrocapsa (> 3µm) with an average of 43.1%, followed by Emiliania huxleyi with 26.9% and a significant difference in abundance was showed by Helicosphaera spp. with 9.2%, Calcidiscus spp. with 5.5%, Gephyrocapsa (<3μm) with 3.4% and Acanthoica spp. with 3%. The following minority abundance taxa were also taken into account: Umbillicosphaera spp. 1.4%, Oolithotus fragilis 0.7%, Pontosphaera spp. 0.5%, Syracosphaera spp. 0.4%. Relative abundances and environm...
La coloración del tegumento de los mamíferos es casi completamente dependiente de la cantidad y t... more La coloración del tegumento de los mamíferos es casi completamente dependiente de la cantidad y tipo de melanina; la enzima tirosinasa es la responsable de la producción de este pigmento. Aproximadamente 100 mutaciones del gen de la tirosinasa pueden causar hipopigmentación, un patrón de pigmentación diferente a la coloración típica de una especie. Esta condición no es común en la vida silvestre, no obstante aproximadamente 25 especies de cetáceos han sido observadas con hipopigmentación, siendo ocho misticetos y 17 odontocetos. El conocimiento acerca de este tópico es necesario para mejorar el entendimiento sobre las implicaciones ecológicas y fisiológicas en estos animales. Aquí reportamos avistamientos de hipopigmentación en delfines tornillo (Stenella longirostris), observados durante 2012-2013 en aguas de Jalisco y Colima. Estos avistamientos y otros reportados en la literatura han pertenecido a individuos adultos, lo que sugiere que la hipopigmentación en esta especie podría p...
En este trabajo se caracterizaron las condiciones hidrográficas de la costa de Jalisco-Colima- Mi... more En este trabajo se caracterizaron las condiciones hidrográficas de la costa de Jalisco-Colima- Michoacán, y se investigó la potencial relación con la distribución de mamíferos marinos en la región. En una embarcación menor se realizaron observaciones y se muestrearon mensualmente seis estaciones en la costa de Colima y sur de Jalisco durante enero-diciembre de 2011; adicionalmente en marzo se hizo un crucero en la región costera (0-20 mn) de Jalisco-Colima-Michoacán para muestrear 15 estaciones. En cada estación se realizaron lances de CTD hasta 100 m de profundidad y se tomaron muestras de agua para nutrientes inorgánicos a 0, 25 y 50 m. Durante invierno-primavera se presentaron valores altos de NO3- + NO2- (6.41 - 8.09 μM) y SiO2 (8.87 - 11.14 μM) a 25 m de profundidad, coincidiendo con una capa de mezcla somera, además se encontraron valores máximos de salinidad (34 - 34.7) y mínimos de temperatura (~23 °C); resultado que coincidió con la mayor riqueza (nueve especies) de mamífer...
The agricultural zones subjected to fertilizer use and inland runoff of nutrients leads to accele... more The agricultural zones subjected to fertilizer use and inland runoff of nutrients leads to accelerated eutrophication with negative effects on coastal ecosystems and therefore significant negative economic impacts. The Palo Verde estuary (PVE) is a shallow estuary (0.4-1.5 m depth) located in the lower area of the sub-basin of the Armería River, in Colima, México. The PVE forms a temporary connection with the sea during unusual extreme meteorological events, but it is otherwise isolated. Freshwater inputs are restricted to discharges from nonpoint sources, such as agricultural runoff, torrential streams, and seasonal input from the Armería River. Farming is practiced along the boundaries of the PVE and involves an area of ~34.36 km 2 such that the estuary is under considerable anthropogenic pressure. The PVE has been recognized as a RAMSAR site (no. 1985), due to the biological, ecological, and socioeconomic importance, but the estuary has been the focus of very few environmental studies, and there is a need to demonstrate, quantify and predict the effects of human activities on these interrelated components in space and time. We describe subsidies to agricultural sector the agricultural and activities within the drainage basin through stakeholder's engagement, also assessing the trophic status of the estuary with a trophic state multivariate index (TRIX) and proposing different ecosystem-based management (EBM). Actions intended to improve and control the use of agrochemicals (fertilizers N and P) in order to preserve ecosystem services.
The false killer whale (Pseudorca crassidens) is a widely distributed odontocete, and some aspect... more The false killer whale (Pseudorca crassidens) is a widely distributed odontocete, and some aspects of its basic biology, such as feeding patterns at different time scales, are not well known. Stable isotope values (δ 15 N and δ 13 C) from the skin of ten false killer whales belonging to two distinct groups (A and B) sampled in October 2012 in the Mexican Central Pacific (MCP) were analyzed. Isotopic analyses were also run on muscle tissue from ten potential fish and squid prey species, some of which were extracted from billfish stomachs. Isotopic results for false killer whales showed mean values of 16.3‰ (Group A) and 17.0‰ (Group B) for δ 15 N, and-14.8‰ for δ 13 C (both Groups A and B). Fish and squid isotopic values showed a trophic discrimination factor in relation to those of false killer whales of +3.3 to 4.0‰ for δ 15 N and +2.9‰ for δ 13 C. This suggests that these whales probably fed within the study area on these prey species or on other species with similar isotopic values. Through photographic data, we identified individuals of Group B in the same area 2 mo later (December 2012) when they were observed feeding on fishes. One false killer whale from Group A had a fragment of billfish beak embedded in its body, indicating an interaction between these two species. Results suggest that false killer whales may share the same type of food resource with billfish species such as the sailfish, an abundant species in the MCP area.
Journal of Toxicology and Environmental Health, Part A, 2014
Determination of the accumulation and elimination of sublethal lead (Pb) in different shrimp tiss... more Determination of the accumulation and elimination of sublethal lead (Pb) in different shrimp tissues may be useful as an indicator of uptake and elimination characteristics of this metal. Aquaculture ponds are particularly influenced by Pb contamination, where aquatic animals may acquire the metal through adsorption to exoskeletons or gills from the surrounding water. Cationic Pb is accumulated preferentially in the nonedible fraction of shrimp, followed by exoskeleton, and to a minor extent in muscle. Lead contents in different tissues were lower than metal levels in exoskeleton. However, the presence of Pb in sediment due to purging may exert adverse consequences on shrimp as bottom feeders.
The increased bacterial resistance to antibiotics has caused global concern, prompting the search... more The increased bacterial resistance to antibiotics has caused global concern, prompting the search for new compounds. Because of their abundance and diversity, marine phytoplankton are an important potential source of such compounds. Research on dinoflagellates has led to the discovery of inhibitors of bacterial growth. The marine dinoflagellate Lingulodinium polyedrum blooms in different regions of the world, including Mexico, and is also known to regulate the growth of other species in coastal waters. Here, we investigate the taxonomy of this dinoflagellate and characterize the ability of its extracts to inhibit the growth of two bacteria of medical importance (Vibrio vulnificus and Staphylococcus aureus) on agar culture plates. Taxonomic characterization was performed by PCR and gene amplification of ITS, and confirmed that the species isolated off the Pacific coast of Mexico was L. polyedrum. To prove the inhibitory effect of L. polyedrum extracts, cultures were harvested by cent...
In this study, morphological characters were used to describe the diversity and seasonal variabil... more In this study, morphological characters were used to describe the diversity and seasonal variability of the genus Pseudo-nitzschia in a coastal region of the Mexican tropical Pacific Ocean. Eleven species were characterized from cultures and field material: Pseudo-nitzschia americana, Pseudo-nitzschia australis, Pseudo-nitzschia brasiliana, Pseudo-nitzschia delicatissima, Pseudo-nitzschia cf. delicatissima, Pseudo-nitzschia dolorosa, Pseudo-nitzschia cf. fryxelliana, Pseudo-nitzschia micropora, Pseudo-nitzschia multistriata, Pseudo-nitzschia pungens var. aveirensis, and Pseudo-nitzschia subfraudulenta. The maximum diversity and abundance occurred in spring, in parallel with a local upwelling, whereas fewer species were detected in autumn. Among those analyzed, the only species to be detected throughout the year at several stations was P. cf. fryxelliana, whereas the rarest species in the study area was P. americana, which was detected only in the spring.
How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative
The increased bacterial resistance to antibiotics has caused global concern, prompting the search... more The increased bacterial resistance to antibiotics has caused global concern, prompting the search for new compounds. Because of their abundance and diversity, marine phytoplankton are an important potential source of such compounds. Research on dinoflagellates has led to the discovery of inhibitors of bacterial growth. The marine dinoflagellate Lingulodinium polyedrum blooms in different regions of the world, including Mexico, and is also known to regulate the growth of other species in coastal waters. Here, we investigated the taxonomy of this dinoflagellate and characterized the ability of its extracts to inhibit the growth of two bacteria of medical importance (Vibrio vulnificus and Staphylococcus aureus). Taxonomic characterization was performed by PCR and gene amplification of ITS, and confirmed that the species isolated off the Pacific coast of Mexico was L. polyedrum. To prove the inhibitory effect of L. polyedrum extracts, cultures were harvested by centrifuga-tion. Pellets ...
Hidrobiológica: [revista del Departamento de Hidrobiología]
espacialmente explícito de la migración estacional del pez (Istiophorus platypterus) vela en el P... more espacialmente explícito de la migración estacional del pez (Istiophorus platypterus) vela en el Pacífico mexicano. Hidrobiológica 21(2): 126-134. RESUMEN Utilizando los datos de captura y esfuerzo registrados en la pesca deportiva realizada en los puertos de Mazatlán,
Resumen Durante febrero de 2007, sobre diez estaciones situadas en la Laguna de Cuyutlán, Colima ... more Resumen Durante febrero de 2007, sobre diez estaciones situadas en la Laguna de Cuyutlán, Colima se extrajeron muestras de sedimento (por triplicado). La profundidad de cada núcleo varió entre 15 y 25 cm, cada uno fue seccionado de la superficie hacia el fondo y a cada segmento se le cuantificó la concentración de carbono orgánico (C-org) y nitrógeno total (N-tot) como indicadores de la presencia de procesos diagéneticos. En toda el área de estudio la textura se caracterizó por estar compuesta principalmente por Limos y Arcillas, sin embargo cinco testigos presentaron una textura más heterogénea asociada a su cercanía con la barra arenosa y a sitios con mayor dinámica en la columna de agua. Las muestras limo-arcillosas presentaron mayores concentraciones de C-org y N-tot que aquellas más arenosas. En cuanto a la distribución vertical del C-org y del N-tot en cinco estaciones su concentración fue relativamente homogénea, en el resto presentó disminuciones del tipo exponencial caracte...
In order to reconstruct the paleoceanography in the Gulf of California, a Reineck core was obtain... more In order to reconstruct the paleoceanography in the Gulf of California, a Reineck core was obtained at 670 m water depth from Carmen Basin (Latitude 25°53,311' N; Longitude 110°52,267' W). Core C53B consists of 26 cm length and 25 samples were observed under the cross-polarizing light microscope (1000x), counting 300 coccoliths per slide (Fatela and Taborda, 2002). Preparation of samples was made using the decantation technique described by Flores and Sierro (1977). The coccolithophore assemblage was dominated by Gephyrocapsa (> 3µm) with an average of 43.1%, followed by Emiliania huxleyi with 26.9% and a significant difference in abundance was showed by Helicosphaera spp. with 9.2%, Calcidiscus spp. with 5.5%, Gephyrocapsa (<3μm) with 3.4% and Acanthoica spp. with 3%. The following minority abundance taxa were also taken into account: Umbillicosphaera spp. 1.4%, Oolithotus fragilis 0.7%, Pontosphaera spp. 0.5%, Syracosphaera spp. 0.4%. Relative abundances and environm...
La coloración del tegumento de los mamíferos es casi completamente dependiente de la cantidad y t... more La coloración del tegumento de los mamíferos es casi completamente dependiente de la cantidad y tipo de melanina; la enzima tirosinasa es la responsable de la producción de este pigmento. Aproximadamente 100 mutaciones del gen de la tirosinasa pueden causar hipopigmentación, un patrón de pigmentación diferente a la coloración típica de una especie. Esta condición no es común en la vida silvestre, no obstante aproximadamente 25 especies de cetáceos han sido observadas con hipopigmentación, siendo ocho misticetos y 17 odontocetos. El conocimiento acerca de este tópico es necesario para mejorar el entendimiento sobre las implicaciones ecológicas y fisiológicas en estos animales. Aquí reportamos avistamientos de hipopigmentación en delfines tornillo (Stenella longirostris), observados durante 2012-2013 en aguas de Jalisco y Colima. Estos avistamientos y otros reportados en la literatura han pertenecido a individuos adultos, lo que sugiere que la hipopigmentación en esta especie podría p...
En este trabajo se caracterizaron las condiciones hidrográficas de la costa de Jalisco-Colima- Mi... more En este trabajo se caracterizaron las condiciones hidrográficas de la costa de Jalisco-Colima- Michoacán, y se investigó la potencial relación con la distribución de mamíferos marinos en la región. En una embarcación menor se realizaron observaciones y se muestrearon mensualmente seis estaciones en la costa de Colima y sur de Jalisco durante enero-diciembre de 2011; adicionalmente en marzo se hizo un crucero en la región costera (0-20 mn) de Jalisco-Colima-Michoacán para muestrear 15 estaciones. En cada estación se realizaron lances de CTD hasta 100 m de profundidad y se tomaron muestras de agua para nutrientes inorgánicos a 0, 25 y 50 m. Durante invierno-primavera se presentaron valores altos de NO3- + NO2- (6.41 - 8.09 μM) y SiO2 (8.87 - 11.14 μM) a 25 m de profundidad, coincidiendo con una capa de mezcla somera, además se encontraron valores máximos de salinidad (34 - 34.7) y mínimos de temperatura (~23 °C); resultado que coincidió con la mayor riqueza (nueve especies) de mamífer...
The agricultural zones subjected to fertilizer use and inland runoff of nutrients leads to accele... more The agricultural zones subjected to fertilizer use and inland runoff of nutrients leads to accelerated eutrophication with negative effects on coastal ecosystems and therefore significant negative economic impacts. The Palo Verde estuary (PVE) is a shallow estuary (0.4-1.5 m depth) located in the lower area of the sub-basin of the Armería River, in Colima, México. The PVE forms a temporary connection with the sea during unusual extreme meteorological events, but it is otherwise isolated. Freshwater inputs are restricted to discharges from nonpoint sources, such as agricultural runoff, torrential streams, and seasonal input from the Armería River. Farming is practiced along the boundaries of the PVE and involves an area of ~34.36 km 2 such that the estuary is under considerable anthropogenic pressure. The PVE has been recognized as a RAMSAR site (no. 1985), due to the biological, ecological, and socioeconomic importance, but the estuary has been the focus of very few environmental studies, and there is a need to demonstrate, quantify and predict the effects of human activities on these interrelated components in space and time. We describe subsidies to agricultural sector the agricultural and activities within the drainage basin through stakeholder's engagement, also assessing the trophic status of the estuary with a trophic state multivariate index (TRIX) and proposing different ecosystem-based management (EBM). Actions intended to improve and control the use of agrochemicals (fertilizers N and P) in order to preserve ecosystem services.
The false killer whale (Pseudorca crassidens) is a widely distributed odontocete, and some aspect... more The false killer whale (Pseudorca crassidens) is a widely distributed odontocete, and some aspects of its basic biology, such as feeding patterns at different time scales, are not well known. Stable isotope values (δ 15 N and δ 13 C) from the skin of ten false killer whales belonging to two distinct groups (A and B) sampled in October 2012 in the Mexican Central Pacific (MCP) were analyzed. Isotopic analyses were also run on muscle tissue from ten potential fish and squid prey species, some of which were extracted from billfish stomachs. Isotopic results for false killer whales showed mean values of 16.3‰ (Group A) and 17.0‰ (Group B) for δ 15 N, and-14.8‰ for δ 13 C (both Groups A and B). Fish and squid isotopic values showed a trophic discrimination factor in relation to those of false killer whales of +3.3 to 4.0‰ for δ 15 N and +2.9‰ for δ 13 C. This suggests that these whales probably fed within the study area on these prey species or on other species with similar isotopic values. Through photographic data, we identified individuals of Group B in the same area 2 mo later (December 2012) when they were observed feeding on fishes. One false killer whale from Group A had a fragment of billfish beak embedded in its body, indicating an interaction between these two species. Results suggest that false killer whales may share the same type of food resource with billfish species such as the sailfish, an abundant species in the MCP area.
Journal of Toxicology and Environmental Health, Part A, 2014
Determination of the accumulation and elimination of sublethal lead (Pb) in different shrimp tiss... more Determination of the accumulation and elimination of sublethal lead (Pb) in different shrimp tissues may be useful as an indicator of uptake and elimination characteristics of this metal. Aquaculture ponds are particularly influenced by Pb contamination, where aquatic animals may acquire the metal through adsorption to exoskeletons or gills from the surrounding water. Cationic Pb is accumulated preferentially in the nonedible fraction of shrimp, followed by exoskeleton, and to a minor extent in muscle. Lead contents in different tissues were lower than metal levels in exoskeleton. However, the presence of Pb in sediment due to purging may exert adverse consequences on shrimp as bottom feeders.
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