scholarly journals Unusual record of Pacific harbor seal (Phoca vitulina richardii) feeding on anchovy (Engraulis mordax) in the fishery of small pelagic fishes in the Gulf of California

2019 ◽  
Vol 53 (3) ◽  
pp. 353
Author(s):  
Isai Barba-Acuña ◽  
Juan Pablo Gallo-Reynoso
Keyword(s):  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Southern Oscillation ◽  
First Record ◽  
Harbor Seal ◽  
Phoca Vitulina ◽  
Fishing Boat ◽  
Engraulis Mordax ◽  
Phoca Vitulina Richardii

Pacific harbor seals (Phoca vitulina richardii) range in North America from Japan to Mexico. Here we report the first record of a Pacific harbor seal feeding on Northern anchovy (Engraulis mordax) inside a purse-seine net of a sardine fishing boat in the Gulf of California. This event was recorded on video on January 11th, 2010, near Estero Tortuga, Guasimas, Sonora (27°50’N, 110°39’W). Sea conditions were of El Niño Southern Oscillation; this record was likely due to El Niño, forcing seals to travel beyond their distribution range in search of alternate foraging areas.

scholarly journals Coral Cd/Ca and Mn/Ca records of El Niño variability in the Gulf of California

2010 ◽  
Vol 6 (1) ◽  
pp. 63-85 ◽  
Author(s):  
J. D. Carriquiry ◽  
J. A. Villaescusa
Keyword(s):  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Southern Oscillation ◽  
Vertical Mixing ◽  
Trade Wind ◽  
Ocean Stratification ◽  
Enso Events ◽  
Mature Phase ◽  
Dissolved Phase

Abstract. We analyzed the trace element ratios Cd/Ca and Mn/Ca in three coral colonies (Pavona gigantea, Pavona clivosa and Porites panamensis) from Cabo Pulmo reef, Southern Gulf of California, Mexico, to assess the oceanographic changes caused by El Niño – Southern Oscillation (ENSO) events in the Eastern Tropical North Pacific (ETNP). The interannual variations in the coral Cd/Ca and Mn/Ca ratios show clear evidence that incorporation of Cd and Mn in the coral skeleton are influenced by ENSO conditions, but the response for each metal is controlled by different process. The Mn/Ca ratios were significantly higher during ENSO years (p<0.05) relative to non-ENSO years for the three species of coral. In contrast, the Cd/Ca was systematically lower during ENSO years, but it was significant (p<0.05) only in P. gigantea. The decrease in the incorporation of Cd, and the marked increase in Mn during the mature phase of El Niño indicate strongly reduced vertical mixing in the Gulf of California. The oceanic warming during El Niño events produces a relaxation of upwelling and a stabilization of the thermocline which acts as a physical barrier limiting the transport of Cd from deeper waters into the surface layer. In turn, this oceanic condition can increase the residence time of particulate-Mn in surface waters, which in turn increases the photo-reduction of particulate-Mn and the release of the available Mn into the dissolved phase. These results provide validation for using Mn/Ca and Cd/Ca in biogenic carbonates as tracers of changes in ocean stratification and trade wind weakening and/or collapse in the ETNP during ENSO episodes.

scholarly journals First record of a by-the-wind-sailor (Velella velella Linnaeus, 1758) in the Galápagos Archipelago - Ecuador

2019 ◽  
Vol 7 ◽  
Author(s):  
Martín Carrera ◽  
José Trujillo ◽  
Margarita Brandt
Keyword(s):  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
First Record ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Santa Cruz ◽  
Galapagos Archipelago ◽  
Official Record

We present the first official record of the by-the-wind-sailor (Velella velella) for Ecuador. Twelve individuals were found along different beaches of San Cristóbal and Santa Cruz Islands in Galápagos Archipelago, Ecuador. These sightings may be influenced by El Niño Southern Oscillation events.

scholarly journals Coral Cd/Ca and Mn/Ca records of ENSO variability in the Gulf of California

2010 ◽  
Vol 6 (3) ◽  
pp. 401-410 ◽  
Author(s):  
J. D. Carriquiry ◽  
J. A. Villaescusa
Keyword(s):  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Southern Oscillation ◽  
Vertical Mixing ◽  
Trade Wind ◽  
Ocean Stratification ◽  
Enso Events ◽  
Mature Phase ◽  
The Difference

Abstract. We analyzed the trace element ratios Cd/Ca and Mn/Ca in three coral colonies (Porites panamensis (1967–1989), Pavona clivosa (1967–1989) and Pavona gigantea (1979–1989)) from Cabo Pulmo reef, Southern Gulf of California, Mexico, to assess the oceanographic changes caused by El Niño – Southern Oscillation (ENSO) events in the Eastern Tropical North Pacific (ETNP). Interannual variations in the coral Cd/Ca and Mn/Ca ratios showed clear evidence that incorporation of Cd and Mn in the coral skeleton was influenced by ENSO conditions, but the response for each metal was controlled by different processes. The Mn/Ca ratios were significantly higher during ENSO years (p<0.05) relative to non-ENSO years for the three species of coral. In contrast, the Cd/Ca was systematically lower during ENSO years, but the difference was significant (p<0.05) only in Pavona gigantea. A decrease in the incorporation of Cd and a marked increase in Mn indicated strongly reduced vertical mixing in the Gulf of California during the mature phase of El Niño. The oceanic warming during El Niño events produces a relaxation of upwelling and a stabilization of the thermocline, which may act as a physical barrier limiting the transport of Cd from deeper waters into the surface layer. In turn, this oceanic condition can increase the residence time of particulate-Mn in surface waters, allowing an increase in the photo-reduction of particulate-Mn and the release of available Mn into the dissolved phase. These results support the use of Mn/Ca and Cd/Ca ratios in biogenic carbonates as tracers of increases in ocean stratification and trade wind weakening and/or collapse in the ETNP during ENSO episodes.

scholarly journals FIRST RECORD OF Ceratium dens (DINOPHYCEAE) IN THE GULF OF CALIFORNIA

2009 ◽  
Vol 24 (2) ◽  
pp. 167
Author(s):  
I. Gárate-Lizárraga
Keyword(s):  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
First Record ◽  
Distribución Geográfica

Primer registro de Ceratium dens Dinophyceae) en el Golfo de California El dinoflagelado Ceratium dens, originalmente descrito del Océano Índico, se registra por primera vez en el Golfo de California y en el Pacífico Mexicano. Se examinaron todos los registros disponibles de C. dens. La distribución geográfica de esta especie es principalmente en aguas tropicales y subtropicales. La presencia de C. dens durante el otoño de 2009 en las aguas del Golfo de California parece relacionarse con condiciones del Evento de El Niño.

VARIABILIDAD CLIMÁTICA, CAMBIO CLIMÁTICO Y PESQUERÍAS EN EL ECUADOR.

2012 ◽  
Vol 1 (1) ◽  
Author(s):  
Johnny Chavarría Viteri ◽  
Dennis Tomalá Solano
Keyword(s):  
Climate Change ◽  
Climate Variability ◽  
Pacific Decadal Oscillation ◽  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Current Action ◽  
Palabras Clave

La variabilidad climática es la norma que ha modulado la vida en el planeta. Este trabajo demuestra que las pesquerías y acuicultura costera ecuatorianas no son la excepción, puesto que tales actividades están fuertemente influenciadas por la variabilidad ENSO (El Niño-Oscilación del Sur) y PDO (Oscilación Decadal del Pacífico), planteándose que la señal del cambio climático debe contribuir a esta influencia. Se destaca también que, en el análisis de los efectos de la variabilidad climática sobre los recursos pesqueros, el esfuerzo extractivo también debe ser considerado. Por su parte, la acción actual de la PDO está afectando la señal del cambio climático, encontrándose actualmente en fases opuestas. Se espera que estas señales entren en fase a finales de esta década, y principalmente durante la década de los 20 y consecuentemente se evidencien con mayor fuerza los efectos del Cambio Climático. Palabras Clave: Variabilidad Climática, Cambio Climático, ENSO, PDO, Pesquerías, Ecuador. ABSTRACT Climate variability is the standard that has modulated life in the planet. This work shows that the Ecuadorian  fisheries and aquaculture are not the exception, since such activities are strongly influenced by ENSO variability (El Niño - Southern Oscillation) and PDO (Pacific Decadal Oscillation), considering that the signal of climate change should contribute to this influence. It also emphasizes that in the analysis of the effects of climate variability on the fishing resources, the extractive effort must also be considered. For its part, the current action of the PDO is affecting the signal of climate change, now found on opposite phases. It is hoped that these signals come into phase at the end of this decade, and especially during the decade of the 20’s and more strongly evidencing the effects of climate change. Keywords: Climate variability, climate change, ENSO (El Niño - Southern Oscillation) and PDO  (Pacific Decadal Oscillation); fisheries, Ecuador. Recibido: mayo, 2012Aprobado: agosto, 2012

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